Enhanced In Vivo Delivery of Stem Cells using Microporous Annealed Particle Scaffolds.


Delivery to the proper tissue compartment is a major obstacle hampering the potential of cellular therapeutics for medical conditions. Delivery of cells within biomaterials may improve localization, but traditional and newer void-forming hydrogels must be made in advance with cells being added into the scaffold during the manufacturing process. Injectable, in situ cross-linking microporous scaffolds are recently developed that demonstrate a remarkable ability to provide a matrix for cellular proliferation and growth in vitro in three dimensions. The ability of these scaffolds to deliver cells in vivo is currently unknown. Herein, it is shown that mesenchymal stem cells (MSCs) can be co-injected locally with microparticle scaffolds assembled in situ immediately following injection. MSC delivery within a microporous scaffold enhances MSC retention subcutaneously when compared to cell delivery alone or delivery within traditional in situ cross-linked nanoporous hydrogels. After two weeks, endothelial cells forming blood vessels are recruited to the scaffold and cells retaining the MSC marker CD29 remain viable within the scaffold. These findings highlight the utility of this approach in achieving localized delivery of stem cells through an injectable porous matrix while limiting obstacles of introducing cells within the scaffold manufacturing process.





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Publication Info

Koh, Jaekyung, Donald R Griffin, Maani M Archang, An-Chieh Feng, Thomas Horn, Michael Margolis, David Zalazar, Tatiana Segura, et al. (2019). Enhanced In Vivo Delivery of Stem Cells using Microporous Annealed Particle Scaffolds. Small (Weinheim an der Bergstrasse, Germany), 15(39). p. e1903147. 10.1002/smll.201903147 Retrieved from https://hdl.handle.net/10161/22635.

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Tatiana Segura

Professor of Biomedical Engineering

Tatiana Segura is a Professor of Biomedical Engineering, Neurology, and Dermatology at Duke University. She received her B.S. degree in Bioengineering from the University of California, Berkeley (UC Berkeley) and her doctorate in Chemical Engineering from Northwestern University.  She began her career in Biomaterials research during her doctoral work working with Prof. Lonnie Shea. She designed hydrogels for local non-viral gene delivery, a topic that she still works on today. She continued her Biomaterials training during her postdoctoral work with Jeffrey Hubbell. There she worked on the design of hydrogels and self-assembled polysulfides for gene delivery. She began her independent career at the University of California, Los Angeles (UCLA) in the Department of Chemical and Biomolecular Engineering reaching the title of Professor. At UCLA she participated actively in service culminating with her election as department Vice Chair and running the Graduate Program. At Duke she has continued to be heavily involved in service at the department, school, and university level. In only 5 years, she has Chaired 6 committees, and participated in at least 6 more, is the direct mentor to two young assistant professors, is the Co-director of the Center for Biotechnology and Tissue Engineering and serves as MPI of the T32 Biotechnology Training grant. Notably she is currently the Chair of the BME department Diversity Equity and Inclusion Committee. 


Prof. Segura’s research is centered on biomaterials and in engineering biomaterial-soft tissue interactions to promote repair and regeneration. Together with her lab members, she designs new biomaterial interventions that can promote brain plasticity after stroke, promote scarless healing in skin wounds, induce tolerance of transplanted skin, and promote constructive immune responses after biomaterial implantation. Currently, her lab has 12 graduate students, 4 postdoctoral scholars, 2 master students, 1 plastic surgery resident, 16 undergraduate students, one high school student, and one research associate. 


Professor Segura has received numerous awards and distinctions during her career, including being named a Senior Member of the National Academy of Inventors, receiving the Acta Biomaterialia Silver Medal, a CAREER Award from the National Science Foundation, a Outstanding Young Investigator Award from the American Society of Gene and Cell Therapy, and a National Scientist Development Grant from the American Heart Association. She was also named a Fellow of the American Institute for Medical and Biological Engineers (AIMBE). Professor Segura has published over 100 peer-reviewed papers and reviews and has over 10,000 citations. Her laboratory has been continuously funded since 2008 with several grants from the National Institutes of Health (NIH). 

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