Abstract
Angiogenesis plays an essential role in embryonic development, organ remodeling, wound healing, and is also associated with many human diseases. The process of angiogenesis in the brain during development is well characterized in animal models, but little is known about the process in the mature brain. Here, we use a tissue-engineered post-capillary venule (PCV) model incorporating stem cell derived induced brain microvascular endothelial-like cells (iBMECs) and pericyte-like cells (iPCs) to visualize the dynamics of angiogenesis. We compare angiogenesis under two conditions: in response to perfusion of growth factors and in the presence of an external concentration gradient. We show that both iBMECs and iPCs can serve as tip cells leading angiogenic sprouts. More importantly, the growth rate for iPC-led sprouts is about twofold higher than for iBMEC-led sprouts. Under a concentration gradient, angiogenic sprouts show a small directional bias toward the high growth factor concentration. Overall, pericytes exhibited a broad range of behavior, including maintaining quiescence, co-migrating with endothelial cells in sprouts, or leading sprout growth as tip cells.
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Acknowledgments
The authors would like to thank Mr. Grant Kitchen, Dr. Dinh-Tuan Phan, and Dr. Yi Lu for help with the design and fabrication of the mold. This work was supported by NIH (NINDS R01NS106008 and NHLBI R61HL154252).
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NZ and PS conceived the original idea. NZ wrote the manuscript. NZ, SK, SZ, RL, TC, ZG, JJ, DN, LL, and AP contributed to the data acquisition, analysis, and interpretation. PS supervised all work.
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Zhao, N., Kulkarni, S., Zhang, S. et al. Modeling angiogenesis in the human brain in a tissue-engineered post-capillary venule. Angiogenesis 26, 203–216 (2023). https://doi.org/10.1007/s10456-023-09868-7
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DOI: https://doi.org/10.1007/s10456-023-09868-7