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Locally enhanced angiogenesis promotes transplanted cell survival
Molly K Smith1, Martin C Peters, Thomas P Richardson
1Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, USA.
Tissue Engineering
|March 11, 2004
Summary
Transplanting cells to restore organ function faces challenges with cell survival. Delivering vascular endothelial growth factor (VEGF) via a polymer matrix significantly improved transplanted cell survival by promoting vascularization.
Area of Science:
- Regenerative Medicine
- Biomaterials Engineering
- Vascular Biology
Background:
- Cell transplantation is a promising therapy for tissue and organ dysfunction.
- Transplanted cell survival is limited by poor vascularization and nutrient supply.
- Developing strategies to enhance vascularization is critical for cell therapy success.
Purpose of the Study:
- To investigate the use of sustained vascular endothelial growth factor (VEGF) delivery from a porous polymer matrix to improve transplanted cell survival.
- To assess the impact of enhanced angiogenesis on the viability of transplanted hepatocytes in vivo.
Main Methods:
- A porous polymer matrix was used for simultaneous delivery of cells and VEGF.
- VEGF-releasing constructs were implanted subcutaneously in SCID mice.
- Hepatocyte survival was evaluated in matrices with and without VEGF over a 1-week period.
Main Results:
- VEGF delivery from the polymer matrix enhanced the angiogenic response over 2 weeks.
- Hepatocytes implanted with VEGF-containing matrices showed significantly greater survival after 1 week compared to controls.
- Enhanced vascularization directly correlated with improved transplanted cell survival.
Conclusions:
- Sustained delivery of VEGF from a porous matrix promotes vascularization and significantly enhances transplanted cell survival.
- This delivery system offers a potential strategy to improve the efficacy of cell-based therapies.
- Future applications may include co-delivery of cell-specific growth factors to further promote cell function and survival.