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J Biol Chem. 2015 Jan 2;290(1):467-77. doi: 10.1074/jbc.M114.603142. Epub 2014 Nov 12.

Specific activation of insulin-like growth factor-1 receptor by ginsenoside Rg5 promotes angiogenesis and vasorelaxation.

Author information

1
From the Departments of Molecular and Cellular Biochemistry.
2
Immunology, and.
3
Neurobiology, School of Medicine, and.
4
the Departments of Biochemistry and.
5
Life Sciences, College of Natural Sciences, Kangwon National University, Chuncheon, Gangwon-do 200-701, South Korea.
6
the Department of Biochemistry, College of Science and Biotechnology, Yonsei University, Seoul 120-749, South Korea, and.
7
the Department of Life and Nanopharmaceutical Sciences, College of Pharmacy, Kyung Hee University, Seoul 130-701, South Korea.
8
From the Departments of Molecular and Cellular Biochemistry, ymkim@kangwon.ac.kr.

Abstract

Ginsenoside Rg5 is a compound newly synthesized during the steaming process of ginseng; however, its biological activity has not been elucidated with regard to endothelial function. We found that Rg5 stimulated in vitro angiogenesis of human endothelial cells, consistent with increased neovascularization and blood perfusion in a mouse hind limb ischemia model. Rg5 also evoked vasorelaxation in aortic rings isolated from wild type and high cholesterol-fed ApoE(-/-) mice but not from endothelial nitric-oxide synthase (eNOS) knock-out mice. Angiogenic activity of Rg5 was highly associated with a specific increase in insulin-like growth factor-1 receptor (IGF-1R) phosphorylation and subsequent activation of multiple angiogenic signals, including ERK, FAK, Akt/eNOS/NO, and Gi-mediated phospholipase C/Ca(2+)/eNOS dimerization pathways. The vasodilative activity of Rg5 was mediated by the eNOS/NO/cGMP axis. IGF-1R knockdown suppressed Rg5-induced angiogenesis and vasorelaxation by inhibiting key angiogenic signaling and NO/cGMP pathways. In silico docking analysis showed that Rg5 bound with high affinity to IGF-1R at the same binding site of IGF. Rg5 blocked binding of IGF-1 to its receptor with an IC50 of ∼90 nmol/liter. However, Rg5 did not induce vascular inflammation and permeability. These data suggest that Rg5 plays a novel role as an IGF-1R agonist, promoting therapeutic angiogenesis and improving hypertension without adverse effects in the vasculature.

KEYWORDS:

Angiogenesis; Endothelial Cell; Insulin-like Growth Factor (IGF); Insulin-like Growth Factor-1 Receptor; Nitric Oxide; Vascular Biology; Vascular Function

PMID:
25391655
PMCID:
PMC4281749
DOI:
10.1074/jbc.M114.603142
[Indexed for MEDLINE]
Free PMC Article

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