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α1D-adrenoceptor involves the relaxation effect of farrerol in rat aortic vascular smooth muscle cells.

Abstract：

:The aim of this study was to investigate the relaxation effect of farrerol on rat aortic vascular smooth muscle cells (VSMCs) and its underlying mechanism. VSMCs were cultured primarily and were used to examine the relaxation effect of farrerol. Cells surface and length were measured by dynamic observation, or by rhodamine-phalloidin labeling and hematoxylin-eosin staining. Cells contractive activity were tested using collagen gel contraction assay. The [Ca2+]in was measured with molecular probe fluo-4-AM. The mRNA and protein expression of regulatory proteins for contraction were measured. In addition, rat aortic VSMCs were transfected with lentivirus-mediated α1D-adrenoceptor gene-shRNA, then the effect of farrerol were detected by the above experimental methods. The results revealed that 10 μΜ AngⅡ promoted cell contraction, increased [Ca2+]in and enhanced collagen contraction in rat aortic VSMCs. 10 μΜ AngⅡ not only increased expression of myosin light chain kinase (MLCK) and smooth muscle protein 22α (SM22α), but also increased phosphorylation level of myosin light chain (MLC) and myosin phosphatase target subunit 1 (MYPT1). The above effects induced by AngⅡ could be significantly inhibited by farrerol in a concentration dependent manner. When the cells were transfected with lentivirus mediated α1D-adrenoceptor gene-shRNA, the effects of farrerol on changes induced by AngⅡ in rat aortic VSMCs were markedly reversed. In conclusion, farrerol could produce relaxtion effect in rat aortic VSMCs precontracted by 10 μΜ AngⅡ, which was involved in downregulation expression of MLCK and SM22α, and inhibition phosphorylation level of MYPT1 and MLC via activating α1D-adrenoceptor gene.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Qin X,Hou X,Zhang K,Li Q

doi

10.1016/j.ejphar.2019.02.012

subject

Has Abstract

pub_date

2019-06-15 00:00:00

pages

169-183

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(19)30103-7

journal_volume

853

pub_type

杂志文章

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