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Biochem Pharmacol. 2013 Aug 1;86(3):392-400. doi: 10.1016/j.bcp.2013.05.006. Epub 2013 May 17.

MicroRNA-15b contributes to ginsenoside-Rg1-induced angiogenesis through increased expression of VEGFR-2.

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Department of Biology, Faculty of Science, Hong Kong Baptist University, Hong Kong.


Ginsenoside-Rg1 (Rg1) has been identified as potent proangiogenic agent, which plays an important role in wound healing promotion or treatment of ischemic injury. We previously reported that miR-214/eNOS pathway was involved in Rg1-induced angiogenesis. Following the same microRNA microarray profiling data, we proposed miR-15b would be another microRNA candidate involved in Rg1-induced angiogenesis. Using human umbilical vein endothelial cells (HUVECs), it was showed that Rg1 could reduce miR-15b expression rapidly and steadily, leading to a temporal induction of vascular endothelial growth factor receptor-2 (VEGFR-2). The in vitro motility and tubulogenesis via VEGFR-2 in Rg1-treated HUVECs were also demonstrated. Besides, the reduction of VEGFR-2 3'-UTR reporter activity by miR-15b in the luciferase reporter gene assay clearly indicated that miR-15b could affect the VEGFR-2 transcript through targeting its 3'-UTR region. Diminishing expression of endogenous miR-15b could increase VEGFR-2 expression and HUVECs migration and tubulogenesis; while over-expression of miR-15b was found to associate with the reduction of VEGFR-2 expression as well as cellular migration and tubulogenesis. In vivo, artificial increment of miR-15b by injecting Pre-miR-15b precursor into zebrafish embryos was also found to significantly suppress the subintestinal vessels formation. In conclusion, our results further demonstrated the involvement of microRNAs in Rg1-induced angiogenesis.


Angiogenesis; Ginsenoside-Rg(1); HUVECs; Microrna-15b; VEGFR-2

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