title: Radix Astragali extract promotes angiogenesis involving vascular endothelial growth factor receptor-related phosphatidylinositol 3-kinase/Akt-dependent pathway in human endothelial cells.
abstract: Angiogenesis plays an important role in a wide range of physiological processes and many diseases are associated with dysregulation of angiogenesis. Radix Astragali, commonly used in traditional Chinese medicine, is a potential candidate for treating such diseases. However, the biological effects of Radix Astragali on angiogenesis and its underlying mechanisms are yet to be elucidated fully. This study describes the angiogenic effects of Radix Astragali extract (RAE) on human umbilical vein endothelial cells (HUVEC) in vitro. It was shown that RAE treatment stimulated HUVEC to proliferate. A significant increase in migration was observed in RAE-treated HUVEC using the wound healing migration assay. In addition, a significant increase in the number of branching points was observed during endothelial cell capillary formation after RAE treatment. It was shown that RAE enhances vascular endothelial growth factor (VEGF) mRNA expression, and that a specific blocker of VEGF receptor 2 (KDR/Flk) inhibited the RAE-induced HUVEC proliferation. In addition, a decrease in the RAE-induced HUVEC proliferation was observed after treatment with inhibitors of phosphatidylinositol 3-kinase (PI3K), Akt and endothelial nitric oxide synthase (eNOS). Taken together, these data suggest that RAE is a potent stimulator of angiogenesis and that its pro-angiogenic effects involve the VEGF-KDR/Flk and PI3K-Akt-eNOS pathways.
authors.affiliation: Institute of Chinese Medical Sciences, University of Macau, Av. Padre Tomás Pereira S.J., Taipa, Macao, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Guang
authors.initials: G
authors.lastname: Hu
authors.forename: Hui-Chao
authors.initials: HC
authors.lastname: Lin
authors.forename: Si-Jia
authors.initials: SJ
authors.lastname: Hong
authors.forename: Yan-Hui
authors.initials: YH
authors.lastname: Deng
authors.forename: Jing-Yan
authors.initials: JY
authors.lastname: Tang
authors.forename: Sai Wang
authors.initials: SW
authors.lastname: Seto
authors.forename: Yiu-Wa
authors.initials: YW
authors.lastname: Kwan
authors.forename: Mary Miu-Yee
authors.initials: MM
authors.lastname: Waye
authors.forename: Yi-Tao
authors.initials: YT
authors.lastname: Wang
authors.forename: Simon Ming-Yuen
authors.initials: SM
authors.lastname: Lee
mesh_terms: D027885:Astragalus propinquus; D002460:Cell Line; D002465:Cell Movement; D049109:Cell Proliferation; D004365:Drugs, Chinese Herbal / Q000494:pharmacology*; D042783:Endothelial Cells / Q000187:drug effects; D006801:Humans; D018919:Neovascularization, Physiologic / Q000187:drug effects*; D058539:Phosphatidylinositol 3-Kinase / Q000378:metabolism*; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism*; D014471:Umbilical Veins / Q000166:cytology; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism*
chemical_list: D004365:Drugs, Chinese Herbal; D042461:Vascular Endothelial Growth Factor A; C027492:Huang Qi; D058539:Phosphatidylinositol 3-Kinase; D051057:Proto-Oncogene Proteins c-akt