Abstract
Angiogenesis is a complicated process including endothelial cell proliferation, migration and tube formation. AAMP plays a role in regulating cell migration of multiple cell types. The purpose of this study was to investigate whether AAMP regulates angiogenesis, and to clarify the role of AAMP in the VEGF-induced angiogenesis. We found that AAMP expressed in multiple cell types and mainly localized in cytoplasm and membrane in vascular endothelial cells. Using tube formation assay in vitro and aortic ring assay, siRNA-mediated knockdown and antibody blockade of AAMP impaired VEGF-induced endothelial cell tube formation and aortic ring angiogenic sprouting. Mechanistic studies showed that AAMP expression was significantly upregulated by VEGF in a concentration and time-dependent manner. Moreover, VEGF recruited AAMP to the cell membrane protrusions. AAMP regulates angiogenesis by mediating the spreading and migration of vascular endothelial cells. AAMP knock-down reduced VEGF-induced actin stress fibers and collagen gel contraction. Furthermore, we identified RhoA/Rho kinase signaling as an important factor that contributes to the action of AAMP in regulating endothelial cell migration and angiogenesis. Altogether, these data demonstrated the critical role of AAMP in angiogenesis and suggested blocking AAMP could serve as a potential therapeutic strategy for angiogenesis-related diseases.
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Acknowledgement
This study was supported by grants from the National Natural Science Foundation of China (31370949, 11332003, 81400329), the Fundamental Research Funds for the Central Universities (CQDXWL-2012-120), Chongqing Science and Technology Commission (cstc2013kjrc-ljrccj10003) and we also thanks for the support from the Chongqing Engineering Laboratory in Vascular Implants,the National “111 Plan” Base (B06023) and the Public Experiment Center of State Bioindustrial Base (Chongqing), China.
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Hu, J., Qiu, J., Zheng, Y. et al. AAMP Regulates Endothelial Cell Migration and Angiogenesis Through RhoA/Rho Kinase Signaling. Ann Biomed Eng 44, 1462–1474 (2016). https://doi.org/10.1007/s10439-015-1442-0
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DOI: https://doi.org/10.1007/s10439-015-1442-0