Format

Send to

Choose Destination
Life Sci. 2009 Jan 16;84(3-4):81-8. doi: 10.1016/j.lfs.2008.11.003. Epub 2008 Nov 14.

Endothelium-independent vasorelaxant effect of sodium ferulate on rat thoracic aorta.

Author information

1
Institute of Cardiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, Zhejiang, China.

Abstract

AIMS:

This study was designed to investigate the effects of sodium ferulate (SF) on rat isolated thoracic aortas and the possible mechanisms.

MAIN METHODS:

Isometric tension was recorded in response to drugs in organ bath. Cytosolic free Ca(2+) concentration ([Ca(2+)](i)) was measured using Fluo-3 in cultured rat aortic smooth muscle cells (RASMC).

KEY FINDINGS:

SF (0.1-30 mM) relaxed the isolated aortic rings precontracted with phenylephrine (PE) and high-K(+) in a concentration-dependent manner with respective pD(2) of 2.7+/-0.02 and 2.6+/-0.06. Mechanical removal of endothelium did not significantly modify the SF-induced relaxation. In Ca(2+)-free solution, SF noticeably inhibited extracellular Ca(2+)-induced contraction in high-K(+) and PE pre-challenged rings, and suppressed the transient contraction induced by PE and caffeine. The vasorelaxant effect of SF was unaffected by various K(+) channel blockers such as tetraethylammonium, glibenclamide, 4-aminopyridine, and barium chloride. In addition, SF concentration-dependently reduced the contraction induced by phorbol-12-myristate-13-acetate, an activator of protein kinase C (PKC), in the absence of extracellular Ca(2+), with the pD(2) of 2.9+/-0.03. In RASMC, SF had no effect on PE- or KCl-induced [Ca(2+)](i) increase either in the presence or in the absence of external Ca(2+).

SIGNIFICANCE:

These results indicate that SF acts directly as a non-selective relaxant to vascular smooth muscle. The direct inhibition of the common pathway after [Ca(2+)](i) increase may account for the SF-induced relaxation in Ca(2+)-dependent contraction, while the blockage of the PKC-mediated contractile mechanism is likely responsible for the SF-induced relaxation in Ca(2+)-independent contraction.

PMID:
19038273
DOI:
10.1016/j.lfs.2008.11.003
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center