Panax notoginseng and its components decreased hypertension via stimulation of endothelial-dependent vessel dilatation.

Abstract

UNLABELLED:

Ginsenoside Rb1 and Rg1 are major components of Panax notoginseng (P.N.), an herb with known clinical efficacy in hypertension and myocardial ischemia in Eastern countries. This investigation is to elicit the mechanism of these components in hypertension via their effect on vascular reaction. To assess the ability of P.N. in hypertension, P.N. extracts were injected in spontaneously hypertensive rats (SHR) via the vena caudalis; Low dosages of P.N. extracts significantly lowered blood pressure in SHR. Examination with Rb1 and Rg1 revealed significant vasodilatation using mouse coronary arteries in a dose-dependent manner. Rb1- and Rg1-induced vasodilatation was blocked by pre-incubation with eNOS and PI3K inhibitors. Coronaries of eNOS-/- mice showed attenuated vasodilatation with Rb1 and Rg1. In addition, both Rb1 and Rg1 induce nitric oxide (NO) generation through increasing the phosphorylation of eNOS, activating Na+-independent l-arginine transport, and stimulating cationic amino acid transport (CAT)-1 mRNA expression in cultured endothelial cells.

CONCLUSION:

Ginsenoside Rb1 and Rg1 increased endothelial-dependent vessel dilatation through the activation of NO by modulating the PI3K/Akt/eNOS pathway and l-arginine transport in endothelial cells. These findings may have important implications for understanding the mechanisms of clinical efficacy of the herb P.N. when used in the regulation of blood pressure.

• Authors: Chunshui Pan, Yingqing Huo, Xiaojin An, Gurbakhshish Singh, Meng Chen, Zhaoxiang Yang, Junxue Pu, Jian Li
• Journal: Vascular pharmacology (Vascul Pharmacol) 2012 Mar-Apr Vol. 56 Issue 3-4 Pg. 150-8 ISSN: 1879-3649 [Electronic] United States
• PMID: 22239978 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2011 Elsevier Inc. All rights reserved.

Chemical References

• Antihypertensive Agents
• Cationic Amino Acid Transporter 1
• Drugs, Chinese Herbal
• Ginsenosides
• Panax notoginseng extract
• ginsenoside Rb1
• Nitric Oxide Synthase Type III
• ginsenoside Rg1

Topics

• Animals
• Antihypertensive Agents (analysis, chemistry, pharmacology, therapeutic use)
• Cationic Amino Acid Transporter 1 (antagonists & inhibitors, genetics, metabolism)
• Cells, Cultured
• Drugs, Chinese Herbal (chemistry, therapeutic use)
• Endothelium, Vascular (cytology, drug effects, metabolism)
• Enzyme Activation (drug effects)
• Gene Expression Regulation (drug effects)
• Ginsenosides (analysis, pharmacology)
• Hypertension (drug therapy)
• In Vitro Techniques
• Male
• Mice
• Mice, Congenic
• Nitric Oxide Synthase Type III (antagonists & inhibitors, chemistry, genetics, metabolism)
• Random Allocation
• Rats
• Rats, Inbred SHR
• Rats, Inbred WKY
• Sus scrofa
• Vasodilation (drug effects)