The Rice Bioengineering Colloquia is a seminar series that has a long tradition at the Department of Bioengineering at Rice University. Each week, experts from around the world are brought to Rice to present the latest findings and research in the broadly defined bioengineering field. In Fall 2021, the BIOE Colloquia will be held on Tuesdays.
Attendees must register in advance to receive the Zoom Webinar link. Graduate students enrolled in BIOE 699 must register for each event to count their attendance.
Thursday, August 18 | 3:00 pm
Heungsoo Shin, PhD
Department of Bioengineering
Hanyang University, Korea
“Biomaterials-based delivery of signaling molecules and cells for tissue engineering and regenerative medicine”
Abstract: Tissue engineering and regenerative medicine have gained considerable interest in recent years due to the potential to treat patients with chronic or degenerative diseases. For example, bone fracture associated with increase in patients with osteoporosis and other injuries becomes one of the large clinical problems, which requires tissue engineering strategy because of limited supply of graft materials. Tissue healing is complex processes involving regulation of inflammatory response after injury, migration, tissue-specific induction of uncommitted mesenchymal stem cells, and remodeling of loosely formed pre-mature tissue. Therefore, it is of importance to consider engineering approaches to regulate multi-facet processes of these tissue healing events. Given that, we have been developing biomaterials as carriers of various cell-instructive signals or stem cells to actively guide tissue regeneration. For example, biomaterials with controlled substrate-mediated delivery of proteins, peptide, or small molecules have been developed to enhance osteogenesis of stem cells and suppression of inflammatory response. The combination of stem cells with these materials have been used to engineer multi-cellular composite 3D spheroids for the fabrication of structurally and functionally reliable in vitro artificial 3D tissues. In addition, strategies for encapsulation of spheroids within biocompatible hydrogels have been explored for recapitulation of cellular microenvironment of engineered tissue of the desired shape with enhanced specific biological functions. This presentation will summarize and discuss our endeavor to engineer biomaterials in regard to how we design them enabling delivery of stem cells and signaling molecules, in particular for regeneration of bone tissue.
Dr. Heungsoo Shin is currently Professor with tenure in the Department of Bioengineering. He received his B.S. and M.S. degree in the Department of Industrial Chemistry from Hanyang University, Korea, and his Ph.D. degree in the Department of Bioengineering from Rice University, USA (2004) from the guidance of Dr. Antonios G. Mikos. He was a postdoctoral researcher at the Department of Mechanical Engineering, Georgia Institute of Technology, USA with Dr. Andres J. Garcia before joining the faculty in the Department of Bioengineering, Hanyang University, Korea in 2006 as assistant professor. His main research areas lie in (1) Development of biomimetic materials for delivery of bioactive molecules and stem cells, (2) Surface modification of biomaterials, (3) Spheroid-based 3D tissue engineering and biofabrication, (4) Cell-extracellular matrix interactions. His works particularly have led innovative approaches in regeneration of impaired bone, muscular, and vascular tissue. He has co-authored over 150 peer-reviewed publications and 18 patents (filed or registered). As of July 1, 2022, total citation of his publication was >11000 with h-index of 53 according to Google Scholar.
He has been serving as co-editors-in-chief in Tissue Engineering Part B: Reviews, and editorial board member of Journal of Biomedical Materials Research A. He has been recognized by various awards including Outstanding Graduate Student Research Award from Society for Biomaterials (2002), Outstanding Rice University Bioengineering Alumnus Award (2012), Yonam Professor Award from LG Yonam Foundation (2013), MR-SPRINGER Award and Mid-career Researcher Academy Award from the Polymer Society of Korea (2013, 2019), HYU Outstanding Research Fellow Award (2016), MEDIPOST Outstanding Research Award, Korean Tissue Engineering and Regenerative Medicine Society (2021),. He is an active member of professional societies including Tissue Engineering and Regenerative Medicine International Society (TERMIS), Biomedical Engineering Society (BMES), Society for Biomaterials (SFB), The Korean Society for Biomaterials (KSBM), and Korean Tissue Engineering and Regenerative Medicine Society (KTERMS). He has been currently serving as a Member of Council, TERMIS-AP from 2017. He also actively involved in international Conferences including service as organizer of International Conference on Tissue Engineering, Aegean Conferences (2022, 2017, and 2014) and a chair of scientific session of World Biomaterials Congress 2024.
Tuesday, September 13 | 4:00 pm
Konstantinos Konstantopoulos, PhD
William H. Schwarz Professor of Chemical and Biomolecular Engineering
Johns Hopkins University
“Cell Mechanosensing and Prognostic Applications in Cancer”
Abstract: Cell migration is a key step in the metastatic cascade of events, as it enables cancerous cells dissociating from a primary tumor to navigate through interstitial tissues and ultimately colonize distant organs. Metastasizing cells migrate by remodeling their surrounding three-dimensional (3D) extracellular matrix to open up migratory paths, by following cancer-associated stroma cells that generate such paths, or by moving through pre-existing, 3D longitudinal channel-like tracks created by various anatomical structures. This seminar will present a multidisciplinary approach, integrating engineering principles and tools with molecular and cell biology techniques to understand cancer cell locomotion in precisely engineered microenvironments, which recapitulate the 3D longitudinal channels encountered in vivo. The plasticity of cancer cell migration will be discussed, focusing on how cells sense, adapt, and respond to different physical cues. Moreover, this presentation will outline how our current knowledge on the molecular mechanisms underlying cell motility has led to the development of a novel microchannel assay capable of distinguishing aggressive from non-aggressive cancer cells for accurate diagnosis, prognosis and precision care of cancer patients.
Tuesday, September 20 | 4:00 pm
Katharina Maisel, PhD
Fischell Department of Bioengineering
University of Maryland, College Park
“Nanoparticles to cross and probe biological barriers for immunotherapy”
Abstract: The Mucosal Associated Immune System Engineering and Lymphatics (MAISEL) Lab’s research integrates materials science, immunology, mucosal barrier physiology, and drug delivery to design nanoparticles to take advantage of and study the interface between biological barriers, particularly the lymphatics, interstitial tissue, and mucosal surfaces, and nanoparticles. Lymphatic vessels are critical for maintenance of tissue homeostasis and forming the adaptive immune response, as they are the natural conduit between peripheral tissues and the lymph nodes, where the immune response is shaped. Because particulates are primarily shuttled via lymphatic vessels, lymphatics have received considerable attention as targets for drug delivery, particularly for immune modulation. Interstitial tissue spaces, including extracellular matrix and mucus mesh, form significant transport barriers to cells, large molecules, particulates, and therapeutics, and transport across these spaces governs what enters lymphatic vessels. The Maisel Lab has made significant progress in understanding how nanoparticle material properties like surface chemistry, affect their transport across biological barriers and how this can be harnessed to study biological barriers and design therapeutics.
Dr. Maisel obtained her BSE in Materials Science and Engineering from the University of Michigan and PhD in Biomedical Engineering from Johns Hopkins University. She completed her postdoctoral training at the University of Chicago in lymphatic and respiratory immunobiology prior to joining the Fischell Department of Bioengineering at the University of Maryland as faculty in 2019. Her interdisciplinary training includes the fields of nanotechnology, materials science, mucosal immunology, lymphatic immunology, and immunoengineering. Dr. Maisel has won a number of awards, including NSF GRFP and NIH F32 fellowships as a trainee, the American Lung Association Dalsemer Award, LAM Foundation Career Development Award, NSF CAREER Award, and NIH NIGMS Maximizing Investigator Research Award. Her work has led to numerous high-impact publications, particularly in the field of drug delivery and mucosal and lymphatic immunoengineering, and several patents.
Tuesday, September 27 | 4:00 pm
Douglas Lauffenburger, PhD
Department of Biological Engineering
Massachusetts Institute of Technology
“Cross-Species Translation of Biological Information via Computational Systems Modeling Frameworks”
Abstract: A vital challenge that the vast majority of biological research must address is how to translate observations from one physiological context to another—most commonly from experimental animals (e.g., rodents, primates) or technological constructs (e.g., organ-on-chip platforms) to human subjects. This is typically required for understanding human biology because of the strong constraints on measurements and perturbations in human in vivo contexts. Direct translation of observations from experimental animals to human subjects is generally unsatisfactory because of significant differences among organisms at all levels of molecular properties from genome to transcriptome to proteome and so forth. Accordingly, addressing inter-species translation requires an integrated experimental/computational approach for mapping comparable but not identical molecule-to-phenotype relationships. This presentation will describe methods we have developed for a variety of cross-species translation examples, demonstrated on applications in inflammatory and neurological pathologies.
Douglas Lauffenburger is Ford Professor of Bioengineering in the Departments of Biological Engineering, Chemical Engineering, and Biology at MIT. He was the founding Head of the Department of Biological Engineering at MIT, and served in that capacity 1998-2019. The Lauffenburger research program centers on systems biology approaches to cell-cell communication and cell signaling in pathophysiology, emphasizing translational application to therapeutics discovery and development in cancer, pathogen infection, and inflammatory disease. Lauffenburger has co-authored the monograph Receptors: Models for Binding, Trafficking & Signaling (Oxford Press, 1993) and co-edited the book Systems Biomedicine: Concepts and Perspectives (Elsevier Press, 2010). More than 130 doctoral students and postdoctoral associates have undertaken research education under his supervision. He is a member of the National Academy of Engineering and American Academy of Arts & Sciences, and a fellow of the American Association for Advancement of Science and the American Scientific Affiliation. Lauffenburger has served as President of the Biomedical Engineering Society, Chair of the College of Fellows of American Institute for Medical & Biological Engineering, on the Advisory Council for the National Institute of General Medical Sciences, and as a co-author of the 2009 National Research Council report A New Biology for the 21st Century. He was a co-awardee of the National Academy of Engineering Gordon Prize for Innovation in Engineering & Technology Education in 2021.
Ahmad (Mo) Khalil | Tuesday, October 18
Brian Applegate | Tuesday, October 25
Kristi Kiick | Tuesday, November 08
Tuesday, April 12 | 4:00 pm (ZOOM/IN-PERSON)
Ron Weiss, PhD
Department of Biological Engineering
Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology
“Mammalian Synthetic Biology: Foundation and Therapeutic Applications”
Abstract: Synthetic biology is revolutionizing how we conceptualize and approach the engineering of biological systems. Recent advances in the field are allowing us to expand beyond the construction and analysis of small gene networks towards the implementation of complex multicellular systems with a variety of applications. In this talk I will describe our integrated computational / experimental approach to engineering complex behavior in a variety of cells, with a focus on mammalian cells. In our research, we appropriate design principles from electrical engineering and other established fields. These principles include abstraction, standardization, modularity, and computer aided design. But we also spend considerable effort towards understanding what makes synthetic biology different from all other existing engineering disciplines and discovering new design and construction rules that are effective for this unique discipline. We will briefly describe the implementation of genetic circuits and modules with finely-tuned digital and analog behavior and the use of artificial cell-cell communication to coordinate the behavior of cell populations. The first system to be presented is a multi-input genetic circuit that can detect and destroy specific cancer cells based on the presence or absence of specific biomarkers in the cell. We will also discuss preliminary experimental results for obtaining precise spatiotemporal control over stem cell differentiation for tissue engineering applications. We present a novel approach for generating and then co-differentiating hiPSC-derived progenitors with a genetically engineered pulse of GATA-binding protein 6 (GATA6) expression. We initiate rapid emergence of all three germ layers as a combined function of GATA6 expression levels and tissue context. We ultimately obtain a complex tissue that recapitulates early developmental processes and exhibits a liver bud-like phenotype that includes haematopoietic and stromal cells, as well as a neuronal niche. This complex organoid can be used for drug development and potentially for tissue transplantation.
Ron Weiss is Professor in the Department of Biological Engineering and in the Department of Electrical Engineering and Computer Science at the Massachusetts Institute of Technology, and is the Director of the Synthetic Biology Center at MIT. Professor Weiss is one of the pioneers of synthetic biology. He has been engaged in synthetic biology research since 1996 when he was a graduate student at MIT and where he helped set up a wet-lab in the Electrical Engineering and Computer Science Department. After completion of his PhD, Weiss joined the faculty at Princeton University, and then returned to MIT in 2009 to take on a faculty position in the Department of Biological Engineering and the Department of Electrical Engineering and Computer Science. The research pursued by Weiss since those early days has placed him in a position of leadership in the field, as evidenced both by publications from his lab as well as a variety of awards and other forms of recognition. He pursued several aspects of synthetic biology, including synthesis of gene networks engineered to perform in vivo analog and digital logic computation. The Weiss lab also published seminal papers in synthetic biology focused on programming cell aggregates to perform coordinated tasks using engineered cell-cell communication with chemical diffusion mechanisms such as quorum sensing. Several of these manuscripts were featured in a recent Nature special collection of a select number of synthetic biology papers reflecting on the first 10 years of synthetic biology. While work in the Weiss lab began mostly with prokaryotes, during the last 5 years a majority of the research in the lab shifted to mammalian synthetic biology. The lab focuses both on foundational research, e.g. creating general methods to improve our ability to engineering biological systems, as well as pursuing specific health related applications where synthetic biology provides unique capabilities.
Tuesday, April 19 | 4:00 pm (ZOOM/IN-PERSON)
Stanislav Emelianov, PhD
Professor of Electrical & Computer Engineering
Biomedical Engineering and Radiology
Georgia Institute of Technology
Emory University School of Medicine
“Ultrasound and Photoacoustic Imaging and Image-Guided Therapy using Nanoscale Theranostic Agents”
Abstract: Manipulation of matter on an atomic and molecular level to produce the desired nanometer scale structures has an enormous potential in the field of medicine including diagnostic imaging, drug delivery, image-guided therapy, and treatment monitoring. This presentation, via examples, will offer a few insights into how nanotechnology and imaging/therapeutic devices can impact fundamental medical science and change the clinical management of diseases. Specifically, high-resolution, high-sensitivity, depth-resolved dual-mode imaging technique based on a synergistic combination of what seems to be drastically different energy sources: light and sound, will be introduced. Augmented with targeted imaging contrast nanoagents, this technique is capable of simultaneous visualization of structural, functional and molecular/cellular properties of tissue. Several approaches and in vivo applications of this multi-scale non-ionizing light-and-sound hybrid imaging—ranging from cancer detection and diagnosis to cell tracking to image-guided molecular and mechano-thermal therapy—will be presented. The role of nanoconstructs in these applications will be highlighted, and the development of nanoconstructs with desired physicochemical properties will be discussed. Finally, current challenges and concerns associated with nanobiotechnology will be presented, and possible solutions will be discussed.
Dr. Stanislav Emelianov is a Joseph M. Pettit Endowed Chair, Georgia Research Alliance Eminent Scholar, and Professor of Electrical & Computer Engineering and Biomedical Engineering at the Georgia Institute of Technology. He is also appointed at Emory University School of Medicine where he is affiliated with Winship Cancer Institute, Department of Radiology, and other clinical units. Furthermore, Dr. Emelianov is Director of the Ultrasound Imaging and Therapeutics Research Laboratory where projects are focused on the discovery, development and clinical translation of diagnostic imaging and therapeutic instrumentation, augmented with theranostic nanoagents. Projects in Dr. Emelianov's laboratory include cancer detection, diagnosis, and treatment, immunotherapy, cell and particle tracking, the development of imaging and therapeutic nanoagents, guided drug delivery and controlled release, as well as cellular, molecular, functional, and multi-modal imaging, and image-guided therapy. In the course of his work, Dr. Emelianov has pioneered several ultrasound-based imaging techniques including shear wave elasticity imaging and molecular photoacoustic imaging. In recognition of his contributions, Dr. Emelianov was elected to the College of Fellows of the American Institute for Medical and Biological Engineering (AIMBE), Institute of Electrical and Electronics Engineers (IEEE), and Acoustical Society of America (OSA).
Tuesday, April 5 | 4:00 pm (IN-PERSON ONLY)
Chris Voigt, PhD
Daniel IC Wang Professor
Department of Biological Engineering
Massachusetts Institute of Technology
Christopher Voigt, PhD is the Daniel I.C. Wang Professor of Advanced Biotechnology in the Biological Engineering Department at MIT and is Co-Director of the Synthetic Biology Center. He is the Editor-in-Chief of ACS Synthetic Biology. He received his BSE in Chemical Engineering from the University of Michigan (1998) and PhD in Biophysics from Caltech (2002). He is a founder of Pivot Bio (microbial agricultural products) and Asimov (human cell synthetic biology). He has served on the science advisory boards of DSM, Bolt Threads, SynLogic, Amyris Biotechnologies, Zymergen, Design Therapeutics, Empress Bio, Aanika, General probiotics, Deepbiome Therapautics, Senti Bio, Axcella, and Twist Bioscience. He is a partner at DCVC Bio, Bio-innovation, and Petri. He has been honored with a National Security Science & Engineering Faculty Fellowship (NSSEFF), Bush Fellows Research Study Team (BFRST), Sloan Fellow, Pew Fellow, Packard Fellow, NSF Career Award, Vaughan Lecturer, MIT TR35, and SynBiobeta Entrepreneurial Leadership Award.
Tuesday, March 29 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Angela K Pannier, PhD
Swarts Family Chair in Biological Systems Engineering
Professor of Biological Systems Engineering and Biomedical Engineering
University of Nebraska-Lincoln (UNL)
“Engineering Extracellular Vesicles for Nonviral Gene Delivery”
Abstract: This talk will explore the various ways the Pannier Lab is engineering extracellular vesicles for use as nucleic acid carriers, including exosomes derived from mesenchymal stem cells (MSCs) as miRNA carriers, and outer membrane vesicles derived from commensal gut bacteria as oral DNA carriers. For the former, recent studies show that many therapeutic effects of MSCs, a cell type investigated in >1000 clinical trials, are actually mediated by exosomes secreted by MSCs, and these therapeutic effects are mechanistically associated with miRNA delivery, making exosomes derived from MSCs excellent candidates for off-the-shelf miRNA therapies. However, the therapeutic potential of natural exosomes is limited by heterogeneity in miRNA content, meaning therapeutic exosomes could be potentiated by engineering increased loading of specific miRNAs. To this end, we have designed a transgenic system that induces cells to load exosomes with a miRNA of choice, making use of priming strategies we have developed to increase gene transfer to stem cells. For the latter, to overcome challenges associated with oral gene delivery, we are developing a novel, biological-based delivery system by loading outer membrane vesicles (OMVs) derived from commensal gut bacteria with plasmid DNA to create DNA-loaded OMV nanocarriers. OMVs are produced by blebbing of the outer membrane of gram-negative bacteria and act as a natural cell-to-cell communication system for bacteria. OMVs can survive gastric transit and are able to cross the mucosal barrier within the intestine. Additionally, OMVs target epithelial cell via natural host-bacteria interactions and elicit either pro- or anti-inflammatory immune responses depending on from which bacteria they originate, presenting an opportunity to leverage their immunomodulatory properties synergistically with the delivered transgene to tailor oral gene delivery platforms to a variety of applications.
Dr. Angela Pannier is the Swarts Family Chair of Biological Systems Engineering and Professor of Biomedical Engineering at the University of Nebraska-Lincoln (UNL). Dr. Pannier’s NIH/NSF/USDA/industry supported research focuses on engineering biomaterials and systems for gene therapy and tissue engineering applications. In 2017 she worked as a visiting scholar at the Leibniz-Institut für Polymerforschung in Dresden, Germany. She is an active member of the American Institute of Chemical Engineers, Biomedical Engineering Society (BMES), and the American Society of Gene and Cell Therapy. Dr. Pannier serves as an Associate Editor for Science Advances and on the editorial board for Experimental Biology and Medicine and Regenerative Medicine Frontiers. Dr. Pannier was awarded the 2017 NIH Director’s New Innovator Award for her pioneering work in gene delivery. In 2019 she was awarded a Presidential Early Career Award for Scientists and Engineers (PECASE) from the White House Office of Science and Technology Policy and is the first Nebraskan to earn this honor. She was named a Fellow of BMES in 2020 and AIMBE in 2022. She holds a BS and MS in Biological Systems Engineering from UNL and a PhD from Northwestern University.
Tuesday, March 08 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Jonathan Rivnay, PhD
Department of Biomedical Engineering
“Polymer-based mixed conductors for applications in bioelectronics ”
Abstract: Direct measurement and stimulation of ionic, biomolecular, cellular, and tissue-scale activity is a staple of bioelectronic diagnosis and/or therapy. Such bi-directional interfacing can be enhanced by a unique set of properties imparted by organic electronic materials. These materials, based on conjugated polymers, can be adapted for use in biological settings and show significant molecular-level interaction with their local environment, readily swell, and provide soft, seamless mechanical matching with tissue. At the same time, their swelling and mixed conduction allows for enhanced ionic-electronic coupling for transduction of biosignals. Through synthetic design and processing we are able to establish design rules towards high performance and stable polymer bioelectronic materials. Such materials open new opportunities for unique form factors and novel device concepts. To this end, I will demonstrate how relaxed design constraints allow for flexible amplification systems for electrophysiological recordings and biochemical detection. Furthermore, advances in additive manufacturing and post functionalization of natural and synthetic biomaterials enable organic bioelectronic composites exhibiting form factors not common of typical bioelectronic devices, which we develop for electroactive scaffolds to modulate tissue state and/or cell fate. These case studies show that fundamental materials research and device engineering continues to fill critical need gaps for challenging problems in bio-electronic interfacing.
Jonathan Rivnay is an Assistant Professor in the Department of Biomedical Engineering at Northwestern University. Jonathan earned his B.Sc. in 2006 from Cornell University. He then moved to Stanford University where he earned a M.Sc. and Ph.D. in Materials Science and Engineering, studying the structure and electronic transport properties of organic electronic materials. In 2012, he joined the Department of Bioelectronics at the Ecole des Mines de Saint-Etienne in France as a Marie Curie post-doctoral fellow, working on conducting polymer-based devices for bioelectronics. Jonathan spent 2015-2016 as a member of the research staff in the Printed Electronics group at the Palo Alto Research Center (PARC, a Xerox Co.) before joining the faculty at Northwestern in 2017. He is a recipient of the Faculty Early Career Development (CAREER) award from the National Science Foundation (2018), and a research fellowship from the Alfred P. Sloan Foundation (2019). He was recently named a Materials Research Society Outstanding Early Career Investigator (2020), and BMES/CMBE Young Innovator (2021).
Tuesday, March 01 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Shaoyi Jiang, PhD
Meinig School of Biomedical Engineering
“Recent Developments in Zwitterionic Materials for Biomedical Applications”
Abstract: An important challenge in many applications is the prevention of unwanted nonspecific biomolecular and macromolecular attachment on surfaces from implants to drug delivery carriers. We have demonstrated that zwitterionic materials and surfaces are highly resistant to nonspecific protein adsorption and microorganism attachment from complex media. Typical zwitterionic materials include poly(carboxybetaine), poly(sulfobetaine), poly(trimethylamine N-oxide), and glutamic acid (E) and lysine (K)-containing poly(peptides). Unlike poly(ethylene glycol) (PEG), there exist diversified zwitterionic molecular structures to accommodate various properties and applications. Furthermore, unlike amphiphilic PEG, zwitterionic materials are super-hydrophilic.
In this talk, I will discuss the application of zwitterionic materials to implants, stem cell cultures, medical devices, and drug delivery carriers. With zwitterionic materials, results show (a) no capsule formation upon subcutaneous implantation in mice up to one year, (b) expansion of hematopoietic stem and progenitor cells (HSPCs) without differentiation, (c) no anti-coagulants needed for artificial lungs in sheep, and (d) no antibodies generated against zwitterionic polymers. I will also discuss recent studies on immunomodulating materials and low-immunogenetic drug delivery carriers and their applications to cancer vaccine and precision medicine.
Shaoyi Jiang joined the Meinig School of Biomedical Engineering at Cornell as the Robert S. Langer ’70 Family and Friends Professor in June 2020. Before Cornell, he was the Boeing-Roundhill Professor of Engineering in the Department of Chemical Engineering and an adjunct professor of Bioengineering at the University of Washington, Seattle. He received his Ph.D. degree in chemical engineering from Cornell University in 1993. He was a postdoctoral fellow at the University of California, Berkeley between 1993 and 1994 and a research fellow at California Institute of Technology between 1994 and 1996 both in chemistry. He is currently an executive editor for Langmuir (ACS journal), an associate editor for Science Advances (a Science family journal from AAAS), a fellow of the American Institute of Chemical Engineers (AIChE), and a fellow of the American Institute for Medical and Biological Engineering (AIMBE). He received the Braskem Award for Excellence in Materials Engineering and Science, AIChE (2017). His research focuses on biomaterials, drug delivery, cancer vaccine and precision medicine
Monday, February 28 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Emma J Chory, PhD
Collins & Esvelt Laboratories
Massachusetts Institute of Technology
"Phage and Robotics-Assisted Biomolecular Evolution"
Abstract: Evolution occurs when selective pressures from the environment shape inherited variation over time. Within the laboratory, evolution is commonly used to engineer proteins and RNA, but experimental constraints have limited our ability to reproducibly and reliably explore key factors such as population diversity, the timing of environmental changes, and chance. We developed a high-throughput system for the analytical exploration of molecular evolution using phage-based mutagenesis to evolve many distinct classes of biomolecules simultaneously. In this talk, I will describe the development of our open-source python:robot integration platform which enables us to adjust the stringency of selection in response to real-time evolving activity measurements and to dissect the historical, environmental, and random factors governing biomolecular evolution. Finally, I will talk about our many on-going projects which utilize this system to evolve previously intractable biomolecules using novel small-molecule substrates to target the undruggable proteome.
Emma Chory is a postdoctoral fellow in the Sculpting Evolution Group at MIT, advised by Kevin Esvelt and Jim Collins. Emma's research utilizes directed evolution, robotics, and chemical biology to evolve novel biologic therapies and proteins. Emma obtained her PhD in Chemical Engineering in the laboratory of Gerald Crabtree at Stanford University. She is the recipient of the NSF Graduate Research Fellowship, a pre- and postdoctoral NIH NRSA Fellowship, and recently received the 2022 SLAS Innovation Award for autonomous directed evolution.
Tuesday, February 15 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Paul J Campagnola, PhD
Department of Biomedical Engineering
University of Wisconsin
“High resolution imaging and modeling of collagen architecture alterations in ovarian cancer and idiopathic pulmonary fibrosis”
Abstract: Many human diseases including all cancers, fibroses, cardiovascular disease and connective tissue disorders are characterized by alterations in the collagen organization relative to normal tissues. We have developed Second Harmonic Generation (SHG) microscope tools to selectively and specifically probe all levels of collagen architecture organization. First we present results for human ovarian cancer, which has a poor 5 year survival rate (~25%). Using a novel form of 3D machine learning, we successfully classified six types of ovarian tumors based on the observed collagen fiber morphology. We also developed polarization sensitive SHG methods to extract collagen macro/supramolecular structural aspects (α-chain pitch and chirality) and found significant differences between normal and malignant ovarian tissues. Collectively, this structural information provides insight into disease etiology and suggests future diagnostic approaches. We also used this set of SHG analyses to probe structural changes in idiopathic pulmonary fibroses (IPF). IPF is a devastating disease with poor prognosis and short expected lifespan following diagnosis and has limited effective treatment options. Similar to ovarian cancer, we found analogous changes in all levels of collagen architecture in IPF compared to normal lung tissues, providing the bases for new prognostic and diagnostic tools. Lastly, we have developed an SHG image-based fabrication approach to creating tissue engineered scaffolds of both ovarian cancer and IPF to study the effects of collagen remodeling on cell-matrix interactions including migration and cytoskeletal dynamics. Here, we utilize both normal and diseased cell lines on normal and diseased models of the ECM, which affords decoupling the roles of cell phenotype from matrix morphology on cell function. In all cases, we found the remodeled matrix drives the cell behavior to a larger extent than the initial cell phenotype. We have also developed a machine learning approach using generative adversarial networks (GANSs) to optimize the scaffold design.
Paul J. Campagnola obtained his PhD in Chemistry from Yale University in 1992 after which he was a postdoctoral associate at the University of Colorado from 1992-1995. He was on the faculty in the Department of Cell Biology, Center for Cell Analysis and Modeling at the University of Connecticut Health Center from 1995-2010, having adjunct appointments in the Physics Department and Biomedical Engineering Program. In 2010 became an Associate Professor in Departments of Biomedical Engineering and Medical Physics at the University of Wisconsin-Madison and was promoted to Professor in 2013. He is currently the Tong Biomedical Engineering Department Chair and UW Kellett Faculty Fellow. He is a Fellow of the Optical Society of America and American Institute for Medical and Bioengineering and currently a Fellow in the Big 10 Alliance Academic Leadership Program.
His research is focused on studying structural and functional aspects of the extracellular matrix (ECM), where we have developed optical microscopy instrumental and analysis methods to study problems in basic science as well as those with translational potential. He has over 100 peer-reviewed journal articles, several review articles and book chapters, co-edited a book “Second Harmonic Generation microscopy” and given over 100 invited talks. He serves on the editorial board for the Journal of Biomedical Optics and serves on numerous NIH and NSF review panels.
Tuesday, February 8 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Seth Childers, PhD
University of Pittsburgh, Department of Chemistry
"Protein engineering strategies revealing the functional significance of biomolecular condensates as organizers of the bacterial cytoplasm"
Abstract: One defining difference between bacteria and eukaryotes is the absence of membrane-bound organelles in bacteria. Recently, phase separation of proteins as biomolecular condensates has been recognized as a fundamental way to organize subcellular space as a “membraneless organelle.” Here, we will describe our discoveries of how biomolecular condensates organize and regulate mRNA decay and signal transduction processes in bacteria. Overall, our discoveries further suggest a new understanding of the bacterial cytoplasm as a crowded "bag of biomolecular condensates."
One significant challenge in cell biology is understanding if these membraneless organelles have any functional significance? To consider the function of biomolecular condensates in vivo, the Childers lab engineered a fluorescence biosensor imaging strategy to visualize changes in histidine kinase structure with subcellular resolution. Application of this engineered FRET biosensor visualized that cell pole localized membraneless organelles alter the structure of a critical cell-fate determining protein. Thus, this FRET biosensor strategy provides a strategy to demonstrate the functional significance of biomolecular condensates. It may also be utilized to map signals perceived by two-component systems.
Given our new understanding of the molecular organization of the bacterial cytoplasm, we considered the potential of biomolecular condensate in bacterial synthetic biology. Towards this goal, we revisited the phase properties of a family of ABC triblock peptide nanomaterials that forms hydrogels for drug delivery at high weight percent. We found ABC triblock proteins assemble as gel-like biomolecular condensates at low micromolar concentrations in vitro. Moreover, expression of the coiled-coil triblock peptides in bacteria leads to cell pole accumulation that could sequester clients at the cell pole with the potential to serve as synthetic membraneless organelles in bacteria. In summary, our studies suggest that phase separation allows bacteria to form membraneless organelles that alter our view of bacterial cell biology and present new opportunities in synthetic biology and new antibiotic targets.
Professor Seth Childers received his B. ChE. degree from the Georgia Institute of Technology in 1999 and worked as a process engineer in the pharmaceutical industry at Merck until 2004. He completed his Ph.D. in biological chemistry at Emory University in 2010 under the mentorship of Professor David Lynn. His graduate studies examined amyloid's phase properties and catalytic capabilities, the causative agent of Alzheimer's Disease. From 2010 to 2015, he was a postdoctoral scholar gaining expertise in bacterial signal transduction in Professor Lucy Shapiro's group at Stanford University. He joined the Department of Chemistry at the University of Pittsburgh in September 2015. His lab has two major research thrusts. One in the area of biomolecular condensates as organizers of biochemistry bacteria. And a second developing area of research is the development of synthetic biology tools to study gut-brain axis dysregulation. Towards this research thrust, the Childers lab applies protein engineering, synthetic biology, microbiology, and biochemistry within each of these research thrusts. He has published 9 peer- reviewed publications, including two papers in Molecular Cell, 2 in ACS Synthetic Biology, 1 in and ACS Sensor. Seth Childers has received two Scialog Fellow Awards as a part of the Chemical Machinery of the Cell 2020-2021 meetings. His research is supported by the NIH and Research Corporation for Scientific Advancement.
Thursday, February 3 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Minji Kim, PhD
Jackson Laboratory for Genomic Medicine
"Molecular communications: transmitting information inside our cells"
Abstract: Our genomes are organized inside the nucleus such that cellular functions are properly performed. This physical structure has been probed by well-established 3D genome mapping technologies Hi-C, ChIA-PET, and their variants, but many questions remain unanswered. I seek to identify who coordinates genome organization, where, when, why, and how. The three protagonists in my story are the zinc finger protein CTCF, a ring-like extruder cohesin, and the transcription machinery RNA Polymerase II. Applying the single-molecule mapping technique ChIA-Drop to human cells revealed that each of these protein factors have distinct roles in forming dynamic loops. In particular, I highlight the dual role of cohesin in forming both structural and regulatory loops, and characterize the causal relationship between genome organization and transcription. These physical communications among protein factors and DNA elements are to be studied further with respect to the time dimension; perhaps the chromatin biology field will expand to study wireless communications in the future.
Minji is a postdoctoral research associate at the Jackson Laboratory (JAX), studying the relationship between nuclear architecture and gene regulation in human and mouse cells. With BS, MS, and PhD degrees in electrical engineering from UC San Diego (UCSD) and University of Illinois at Urbana-Champaign (UIUC), she develops computational algorithms that enable the analysis of 3D genome mapping data. Her research has been supported by the NIH Pathway to Independence Award and the NSF Graduate Research Fellowship.
Tuesday, February 1 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Alison Schroer Vander Roest, PhD
"Cardiac mechanobiology: Modeling altered cardiac biomechanics across scales to understand mechanisms of disease"
Abstract:Heart disease is the leading cause of death in the developed world, and many forms of cardiac disease are characterized by changes in contractile function and tissue stiffness. Hypertrophic cardiomyopathy (HCM) is the most common inherited form of heart disease, and one of the most common sites of disease causing mutations is beta cardiac myosin, the motor protein responsible for contraction. While HCM is characterized clinically by muscle cell (cardiomyocyte) growth and hypercontractility, HCM mutations cause a diverse range of effects on the molecular function of myosin that may have implications for disease severity and treatment options. My postdoctoral research has focused on using gene-edited human induced pluripotent stem cells in engineered environments to measure the effects of these mutations at the cellular scale; namely: increased traction force generation, increased cell size, increased signaling of hypertrophic pathways, and altered cytoskeletal and cell junction organization. I have used computational models to integrate multiple changes in myosin molecular function and cytoskeletal organization to predict changes in cellular forces that can be compared with measured forces to identify driving mechanisms. My research vision leverages engineering tools to clarify the complex mechanical and biological effects of disease-causing mutations and can help inform the development and application of new therapies for HCM and other cardiac diseases.
Alison Schroer Vander Roest received her undergraduate degree in biomedical engineering at the University of Virginia. She then received a PhD in biomedical engineering at Vanderbilt University with Dr. Dave Merryman, studying fibroblast mechanobiology and the role of cadherin-11 in fibrotic and inflammatory remodeling after myocardial infarction. After completing her doctoral work, Alison pursued postdoctoral training at Stanford University as part of a collaborative team between the mechanical and bioengineering, biochemistry, and pediatric cardiology departments. Her project at Stanford has been co-mentored by Dr. Beth Pruitt, Dr. Jim Spudich, and Dr. Dan Bernstein and aims to understand mechanisms linking mutations in beta-cardiac myosin to phenotypes of hypertrophic cardiomyopathy using stem cell models and engineered environments. Alison has also developed collaborations to incorporate transcriptome analysis, FRET tension sensors, and computational modeling of myosin kinetics to better understand cardiomyocyte mechanobiology. This project has been awarded a K99/R00 Pathway to Independence Award that will fund future research into multiscale mechanisms of cardiac disease.
Tuesday, January 25 | 4:00 pm (ZOOM)
John P Fisher, PhD
Fischell Department of Bioengineering
University of Maryland
"3D Printing for Engineering Complex Tissues"
Abstract:The generation of complex tissues has been an increasing focus in tissue engineering and regenerative medicine. With recent advances in bioprinting technology, our laboratory has focused on the development of platforms for the treatment and understanding of clinically relevant problems ranging from congenital heart disease to preeclampsia. We utilize stereolithography-based and extrusion-based additive manufacturing to generate patient-specific vascular grafts, prevascular networks for bone tissue engineering, dermal dressings, cell-laden models of preeclampsia, and bioreactors for expansion of stem cells. Furthermore, we have developed a range of UV crosslinkable materials to provide clinically relevant 3D printed biomaterials with tunable mechanical properties. Such developments demonstrate the ability to generate biocompatible materials and fabricated diverse structures from natural and synthetic biomaterials. In addition, one of the key challenges associated with the development of large tissues is providing adequate nutrient and waste exchange. By combining printing and dynamic culture strategies, we have developed new methods for generating macrovasculature that will provide adequate nutrient exchange in large engineered tissues. Finally, the use of stem cells in regenerative medicine is limited by the challenge in obtaining sufficient cell numbers while maintaining self-renewal capacity. Our efforts in developing 3D-printed bioreactors that mimic the bone marrow niche microenvironment have enabled successful expansion of mesenchymal stem cells by recapitulating the physiological surface shear stresses experienced by the cells. This presentation will cover the diverse range of materials and processes developed in our laboratory and their application to relevant, emerging problems in tissue engineering.
Dr. John P. Fisher is the Fischell Family Distinguished Professor and Department Chair in the Fischell Department of Bioengineering at the University of Maryland. Dr. Fisher is also the Director of the NIBIB / NIH Center for Engineering Complex Tissue (CECT) that aims to create a broad community focusing on 3D printing and bioprinting for regenerative medicine applications. Dr. Fisher completed a B.S. in biomedical and chemical engineering at The Johns Hopkins University (1995), M.S. in chemical engineering at the University of Cincinnati (1998), Ph.D. in bioengineering at Rice University (2003), and postdoctoral fellowship in cartilage biology and engineering at the University of California Davis (2003). As the Director of the Tissue Engineering and Biomaterials Laboratory, Dr. Fisher’s group investigates biomaterials, stem cells, bioprinting, and bioreactors for the regeneration of lost tissues, particularly bone, cartilage, and cardiovascular tissues. Dr. Fisher’s laboratory has published over 200 articles, book chapters, editorials, and proceedings (11,500+ citations / 60 hindex) as well as delivered over 340 invited and contributed presentations, while utilizing over $15M in financial support from NIH, NSF, FDA, NIST, DoD, and other institutions. Dr. Fisher has been elected Fellow of the American Institute for Medical and Biological Engineering (2012), the Biomedical Engineering Society (2016), and the International Academy of Medical and Biological Engineering (2020). Dr. Fisher has received the Clemson Award for Contributions to the Literature from the Society For Biomaterials (2020), the Senior Scientist Award from the Tissue Engineering and Regenerative Medicine International Society - Americas (TERMIS-AM) Chapter (2017), a Fulbright Fellowship to study at the National University of Ireland, Galway (2015), the Next Power Professorship from Tsing Hua University in Taiwan (2015), the Engalitcheff Award from the Arthritis Foundation (2008), the Outstanding Graduate Alumnus Award from the Department of Bioengineering at Rice University (2007), the Arthritis Foundation’s Investigator Award (2006), and the National Science Foundation CAREER Award (2005). Dr. Fisher is currently the Co-Editor-in-Chief of the journal Tissue Engineering, while also co-editing 6 texts in the field of tissue engineering. In 2014, Dr. Fisher was the Chair of the Tissue Engineering and Regenerative Medicine International Society - Americas (TERMIS-AM) Chapter Annual Meeting in Washington, DC. Also in 2014, Dr. Fisher was elected Chair of TERMIS-AM, and in 2018 started his three year term as Chair of the Chapter after serving three years as Chair-Elect. In 2018, Dr. Fisher was the Co-Chair of the Biomedical Engineering Society (BMES) Annual Meeting in Atlanta, GA, celebrating the 50th Anniversary of BMES.
Thursday, January 27 | 4:00 pm (ZOOM)
Collin Tokheim, PhD
Postdoctoral Research Fellow
Harvard T.H. Chan School of Public Health
Dana-Farber Cancer Institute
"Computationally-driven Identification of Cancer Targets Susceptible to Targeted Protein Degradation"
Abstract: Since their clinical discovery in 2014, Targeted Protein Degradation (TPD) drugs have started to expand the druggable targets in oncology. Unlike existing drugs that block the activity of a target, TPD drugs degrade a protein-of-interest by hijacking the cell’s Ubiquitin-Proteasome System (UPS). However, there is an incomplete understanding about how protein degradation is dysregulated in cancer and how TPD drugs may counteract this effect. Leveraging multi-omics data across more than 9,000 human tumors and 33 cancer types, we found that over 19% of all cancer driver genes impact UPS function. Moreover, we developed a deep learning model (deepDegron) to identify mutations that result in loss of protein degradation signals (degrons), and experimentally validated predictions of point mutations (e.g. in GATA3) and gene fusions (e.g. BCR-ABL) that result in escape from protein degradation. In a second study, we found that altered protein degradation of Cebpd can influence immunotherapy response in a Triple Negative Breast Cancer (TNBC) model by complementing in vivo CRISPR screens with multi-omic data analysis spanning the epigenome, transcriptome and proteome. Lastly, to assess for potential therapeutic vulnerabilities, we developed a machine learning model, MAPD (Model-based Analysis of Protein Degradability), to predict which protein targets are likely degradable by TPD compounds from unbiased proteomic experiments of the kinome. In summary, new computational methods uncovered an underappreciated oncogenic role for dysregulated protein degradation with potential therapeutic implications.
Collin Tokheim received his Ph.D. in Biomedical Engineering from Johns Hopkins University in 2018. During his Ph.D., his research focused on the development and application of novel computational methodologies to statistically implicate mutations underlying the development or progression of human cancers. He has expertise in machine learning, statistical modeling, genomics, and cancer genetics. Collin is now a Research Fellow at the Harvard School of Public Health and Dana-Farber Cancer Institute. Dr. Tokheim's current research focus is to use computational methods to understand how protein degradation is dysregulated in cancer and how this informs an emerging therapeutic paradigm of Targeted Protein Degradation (TPD) drugs. TPD drugs selectively and potently eliminate -- rather than inhibit -- disease causing proteins. Dr. Tokheim has been the recipient of numerous awards and fellowships, including the Martin & Carol Macht award, Emerging Leaders in Computational Oncology Award, an NCI NRSA fellowship, and the inaugural Damon Runyon fellowship in Quantitative Biology.
Thursday, January 20 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Xiao Huang, PhD
"Precise Modulation of Biological Systems with Advanced Materials"
Abstract: Xiao Huang received his PhD degree in Chemistry and Materials at UC Santa Barbara in 2016. There he developed a method to spatially control biomolecule delivery in human embryonic stem cells mediated by near-infrared light responsive nanocarriers. He is now a postdoc scholar in the lab of Dr. Tejal Desai at UCSF, working at the interface between materials and therapeutic biologics. One highlight from his work is the development of a robust chemistry to surface-functionalize biocompatible materials with exquisite ratiometric precision for applications in immune modulation. Additionally, using advanced imaging methods, he uncovered a new mechanism of epithelial cell tight junction modulation from nanotopographic stimulation. He has published 7 first-authored papers in journals including Nat. Nanotechnol., Adv. Mater., and ACS Nano, etc., is a co-inventor on 2 pending patents, and has been awarded fellowships from UCSF-PBBR, Li Foundation, and CIRM. His future research interest is to develop innovative engineering platforms and analytical methods to advance understanding and modulation of immunological processes.
Biological systems orchestrate a series of finely controlled events inter- and intracellularly that maintain homeostasis. Synthetic materials can be precisely surface-functionalized with bioactive compounds to modulate cellular events for various biomedical applications. For example, a multi-model display of biomolecules on material surfaces can mimic cell-cell interactions at immune synapses to modulate immunotherapies. Meanwhile, the efficient display of specific functionalities on nanocarriers can facilitate intracellular delivery of biomolecules to regulate or edit genes for disease treatment. Further, the inherent physical features of synthetic materials—size, topography, photoactivity, etc.—provide additional parameters to enable more precise biological control. Currently, there remain several gaps in coordinating the functional capabilities of advanced materials with biological applications. In this seminar, I will describe our work to address challenges in engineering material-cell interfaces. First, we developed a new DNA-scaffold based strategy for biomaterial surface functionalization to allow for density and ratiometric control of multiple functionalities. With this strategy, we designed micron-sized spherical particles with precisely controlled immune modulatory signals and have shown advantages in human T cell activation. We also demonstrated the in vivo utility of this platform through local administration in mice to activate CAR-T cells and minimize off-tumor toxicity. Second, we used surface-functionalized nanoparticles to achieve targeted delivery of biomolecules in cancer and human embryonic stem cells. Importantly, the use of near-infrared light-responsive nanocarriers enabled exquisite cell resolution control of gene silencing guided by light. Third, nanotopographic materials have shown to modulate epithelial tight junctions through a novel mechanism of protein phase separation. Moving forward, I am particularly interested in controlling chemophysical features of functionalized materials to facilitate immunotherapies and gain new knowledge in immunology.
Tuesday, January 18 | 4:00 pm (ZOOM)
Mahla Poudineh, PhD
Assistant Professor and Director of the IDEATION Lab
University of Waterloo
"Next-Generation Enabling Technologies for Health Monitoring"
Abstract:To enable personalized and precision medicine, it is crucial to monitor patient health status and bring information on disease-related agents and therapeutic drug molecules into the clinic. This requires new technologies to interrogate different body fluids that are rich sources of biomarkers, such as whole blood and interstitial fluid (ISF). Such technologies enable rapid, sensitive and - ultimately - real-time and continuous analysis of the clinically important biomarkers. Biophysics, materials chemistry and polymer and molecular engineering, as well as micro and nanofabrication, are crucial tools in this endeavor. At IDEATION Lab, we apply innovative engineering solutions to advance patient health monitoring using two main technologies: Microneedles and Microfluidics. In the first part of my talk, I will present our new transdermal biosensing technologies powered by engineered hydrogel microneedles (HMNs), aptamer probes, and in-situ metallic nanoparticle synthesis for minimally invasive, on-needle, and real-time measurement of clinically important biomarkers in ISF. Our HMN assays expect to pave the way for the next-generation of polymeric-based wearable biosensors. In the second part, I will discuss a real-time biosensor driven by microfluidic techniques that continuously updates specific biomolecules’ fluctuating concentration levels with picomolar sensitivity directly in whole blood. For the first time, our microfluidic assay enables measuring the dynamic changes in blood insulin which is an important knowledge gap in diabetes management. The new advances reported in this talk, enrich the level of information that can be collected from different body fluids, and provide new means and potentials for highly accurate patient health status monitoring, thus transforming the field of personalized and precision medicine.
Mahla Poudineh is an Assistant Professor at the University of Waterloo, Department of Electrical and Computer Engineering and the founding director of IDEATION Lab (Integrated Devices for Early disease Awareness and Translational applicatIONs Laboratory) since January 2020. She received her Ph.D. degree in Electrical Engineering from the University of Toronto in 2016. Prior to joining Waterloo, Mahla completed postdoctoral training at the University of Toronto, and Stanford University, School of Medicine in 2018 and 2019, respectively. Her research interests include developing biosensing approaches for diagnostic and therapeutic purposes, continuous health monitoring and translating biomedical devices to the clinic and market. Her research has been selected as Science Translational Medicine Editor’s choice article and highlighted in the Nature News&Views. She was the recipient of the best poster award during the Micro- and Nanotechnologies for Medicine Workshop held at UCLA (July 2019). She has been also selected as an Inaugural Contributor to the Advanced Materials “Rising Stars” Series and to the Nanoscale Emerging Investigators Themed Collection.
Thursday, January 13 | 4:00 pm (HYBRID - ZOOM/IN-PERSON)
Lei Li, PhD
California Institute of Technology
"New Generation Photoacoustic Imaging: From benchtop wholebody imagers to wearable sensors"
Abstract: Whole-body imaging has played an indispensable role in preclinical research by providing high-dimensional physiological, pathological, and phenotypic insights with clinical relevance. Yet, pure optical imaging suffers from either shallow penetration or a poor depth-to-resolution ratio, and non-optical techniques for whole-body imaging of small animals lack either spatiotemporal resolution or functional contrast. We have developed a dream machine, demonstrating that a stand-alone single-impulse panoramic photoacoustic computed tomography (SIP-PACT) mitigates these limitations by combining high spatiotemporal resolution, deep penetration, anatomical, dynamical and functional contrasts, and full-view fidelity. SIP-PACT has imaged in vivo whole-body dynamics of small animals in real time, mapped whole-brain functional connectivity, and tracked circulation tumor cells without labeling. It also has been scaled up for human breast cancer diagnosis. SIP-PACT opens a new window for medical researchers to test drugs and monitor longitudinal therapy without the harm from ionizing radiation associated with X-ray CT, PET, or SPECT. Genetically encoded photochromic proteins benefit photoacoustic computed tomography (PACT) in detection sensitivity and specificity, allowing monitoring of tumor growth and metastasis, multiplexed imaging of multiple tumor types at depths, and real-time visualization of protein-protein interactions in deep-seated tumors. Integrating the newly developed microrobotic system with PACT permits deep imaging and precise control of the micromotors in vivo and promises practical biomedical applications, such as drug delivery. In addition, to shape the benchtop PACT systems toward portable and wearable devices with low cost without compromising the imaging performance, we recently have developed photoacoustic topography through an ergodic relay, a high-throughput imaging system with significantly reduced system size, complexity, and cost, enabling wearable applications. As a rapidly evolving imaging technique, PACT promises preclinical applications and clinical translation.
Lei Li obtained his Ph.D. degree from the Department of Electrical Engineering at California Institute of Technology (Caltech) in 2019. He received his MS degrees at Washington University in St. Louis in 2016. He is currently a postdoctoral scholar in the Department of Medical Engineering at Caltech. His research focuses on developing next-generation medical imaging technology for understanding the brain better, diagnosing early-stage cancer, and wearable monitoring of human vital signs. He was selected as a TED fellow in 2021 and a rising star in Engineering in Health by Columbia University and Johns Hopkins University (2021). He received the Charles and Ellen Wilts Prize from Caltech in 2020 and was selected as one of the Innovators Under 35 by MIT Technology Review in 2019. He is also a two-time winner of the Seno Medical Best Paper Award granted by SPIE (2017 and 2020, San Francisco).
Tuesday, January 11 | 4:00 pm (ZOOM)
Yvon Woappi, PhD
"Orchestrating cellular regeneration at organ scale"
Abstract: Large scale tissue damage, such as organ failure and burn injury, is a leading cause of morbidity and death. However, the mechanisms underlying full regeneration of organs remain poorly understood. As the largest organ system in the body, the integumentary system is a composite tissue evolutionarily adapted for healing. Consequently, its complex physiology requires multifaceted cooperation between several distinct cell populations and cell lineages of embryologically distinct origins. Equally integrated within this dynamic process is local immune response that produces mitogenic and inhibitory signals throughout the restoration procedure. There remains a significant gap in understanding how these processes are orchestrated, and how various skin cell populations from distinct developmental lineages functionally cooperate to regenerate tissue at organ scale. My research seeks to characterize the molecular language of tissue healing and to harness this malleable dialect for the regeneration of mammalian organs. Through the development of organoid-based models of wound healing, and the coupling of these systems with novel gene-editing approaches, my work is enabling the functional understanding of the multifaceted cellular events executed throughout restorative healing. Discoveries from this work have established several high throughput technologies and have illustrated their utility in identifying novel regulators of tissue healing.
Dr. Yvon Woappi’s passion for life sciences ignited during his childhood in Douala, Cameroon and was magnified after his family immigrated to Hanover, Pennsylvania during his middle school years. He went on to receive his B.S in Biology at the University of Pittsburgh, and his Ph.D. in Biomedical Sciences as a Grace Jordan McFadden Fellow under Lucia Pirisi at the University of South Carolina. Dr. Woappi is currently a postdoctoral fellow in the Harvard Dermatology Research Program under the supervision of Matthew Ramsey and Professor Thomas Kupper. His work focuses on engineering 3D skin culture systems and multifunctional gene-editing platforms to study multi-lineage tissue regeneration. He was recipient of the 2019 Engineering The Genome Keystone award and was selected as a Rising Star in Biomedical Sciences by MIT, Cornell, and Columbia University. Most recently Dr. Woappi was awarded the NIGMS-MOSAIC K99/R00 Postdoctoral Career Transition Award to launch his independent research laboratory. Away from the bench, Dr. Woappi is an ardent proponent of inclusive excellence and currently sits on the advisory committee for the NIH Continued Umbrella Research Experiences Program at Harvard Medical School.
Thursday, January 6 | 4:00 pm (HYBRID - ZOOM AND IN-PERSON)
BioScience Research Collaborative Room 282
Nathan Reticker-Flynn, PhD
Instructor, Department of Pathology
"Roles of systemic immunity in tumor metastasis and effective immunotherapy"
Abstract: The majority of cancer-associated deaths result from distant organ metastases rather than primary tumors, yet few therapies exist to treat this stage of disease. Recent advances in tumor immunotherapies, such as immune checkpoint blockade, have shown promise for patients with metastatic disease, yet most patients remain unresponsive to these treatments. Here, we investigate the roles of systemic immunity in metastatic progression and response to immunotherapies. We demonstrate that lymph node colonization plays a critical role in metastatic progression by imparting tumor-specific immune tolerance within the immune repertoire of the involved lymph nodes. This tolerance becomes systemic across the host and facilitates metastatic seeding of distant sites. Furthermore, using mouse models, mass cytometry, and systems approaches, we demonstrate that the generation of effective anti-tumor immune responses to immunotherapies requires systemic activation of immunity rather than reinvigoration of immune populations within the local tumor microenvrionment. Together, these findings demonstrate the critical roles of systemic immunity in promoting metastatic progression and driving responses to immunotherapy.
Nathan Reticker-Flynn is a Biomedical Engineer and tumor immunologist working at the interfaces of cancer metastasis, tumor evolution, adaptive immunity, and immuno-oncology. He received his PhD from the Massachusetts Institute of Technology while working with Dr. Sangeeta Bhatia as part of the Harvard-MIT Division of Health Sciences and Technology. His doctoral studies focused upon developing technologies for interrogating interactions between tumors and extracellular matrix during metastatic progression. Using mouse models of lung adenocarcinoma, his studies revealed that metastatic cells alter their adhesion properties, preferentially binding to combinations of ECM containing fibronectin and a family of lectins known as galectins. These interactions are mediated through alterations in integrin expression as well as aberrant glycosylation, the latter of which confers an ability to interact with pro-tumorigenic myeloid populations within the metastatic niche. Dr. Reticker-Flynn performed his postdoctoral studies in the laboratory of Dr. Edgar Engleman at Stanford University School of Medicine. There, his work has focused on using systems approaches and mouse models to investigate tumor-immune interactions during metastasis and responses to immunotherapies. His discoveries include the revelation that effective immunotherapies require systemic activation of anti-tumor immunity and that lymph node metastases serve to reeducate adaptive immune responses in a manner that promotes distant metastasis. His work is funded through various NIH mechanisms as well as a METAvivor Early Career Investigator award.