Activation of the Iberiotoxin-sensitive Bkca Channels by Salvianolic Acid B of the Porcine Coronary Artery Smooth Muscle Cells.
From: Li Ka Shing Institute of Health Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, PR China.
European journal of pharmacology
- Publish Date: Sep 2006
- ISSN: 0014-2999
- Volume: 546
- Issue: 1-3
- Pages: 28-35
- Medium: Print
- Language: English
- Citation (JAMA): Lam Francis Fu Yuen, Seto Sai Wang, Kwan Yiu Wa, et al. Activation of the Iberiotoxin-sensitive Bkca Channels by Salvianolic Acid B of the Porcine Coronary Artery Smooth Muscle Cells.. Eur. J. Pharmacol. Sep 2006;546:28-35
Abstract
In this study, we examined the effects of Salvia miltiorrhiza (Danshen) crude extract, some of its lipid-soluble components (tanshinone I, tanshinone II(A), cryptotanshinone, dihydroisotanshinone I) and the water-soluble compounds (danshensu and salvianolic acid B) on the K(+) channels such as the iberiotoxin-sensitive Ca(2+)-activated K(+) (BK(Ca)) channels and the glibenclamide-sensitive ATP-dependent K(+) (IK(ATP)) channels of the porcine left anterior descending coronary artery smooth muscle cells. Cumulative application of salvianolic acid B (30-300 microM) caused a l-NNA (100 microM)-insensitive, potentiation of the outward BK(Ca) current amplitude with no apparent effect on the IK(ATP) channels opening. Salvianolic acid B (300 microM) caused an ODQ (10 microM, a guanylate cyclase inhibitor)-sensitive enhancement of the outward BK(Ca) current amplitude. In contrast, none of the other isolated chemical constituents of S. miltiorrhiza modified the openings of the two types of K(+) channels studied. In conclusion, our results suggest that salvianolic acid B, a major hydrophilic constituent found in Radix S. miltiorrhiza, activated the opening of the BK(Ca) channels of the porcine coronary artery smooth muscle cells through the activation of guanylate cyclase without the involvement of the nitric oxide synthase activation.
Mesh Headings (Keywords): Animals, Benzofurans, Coronary Vessels, Cromakalim, Dose-Response Relationship, Drug, Drugs, Chinese Herbal, Enzyme Activation, Enzyme Inhibitors, Glyburide, Guanylate Cyclase, Ion Channel Gating, Membrane Potentials, Muscle, Smooth, Vascular, Nitric Oxide Synthase, Nitroarginine, Oxadiazoles, Patch-Clamp Techniques, Peptides, Potassium Channel Blockers, Potassium Channels, Potassium Channels, Calcium-Activated, Quinoxalines, Receptors, Drug, Salvia miltiorrhiza, Swine
Check for Full Text / PubMed Unique Identifier (PMID): 16928370
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