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Regulation of the endothelin-1 transmembrane signaling pathway: the potential role of agonist-induced desensitization in the coronary artery of the rapid ventricular pacing-overdrive dog model of heart failure.

Abstract：

:This study examined the potential role of ET-1 and the contribution of protein kinase C (PKC) in the desensitization of the ET-1 transmembrane signaling pathway in the left circumflex coronary artery (CCA) of a dog model of congestive heart failure (CHF). In the CCA of the rapid ventricular pacing-overdrive dog model of CHF, elevated plasma endothelin levels were associated with a decrease in the basal accumulation of inositol phosphates and ET-1 mediated activation of phosphatidylinositol (PI) turnover (P < 0.05). To assess whether elevated plasma ET-1 levels may have contributed to the diminished ET-1 responsiveness in the heart failure dogs, ET-1 generation of inositol phosphates was measured following a one hour pretreatment of normal coronary artery rings with 0.1 nM ET-1. As compared to non-treated rings, ET-1 pretreatment resulted in a 33% decrease of ET-1 (10 nM) production of inositol phosphates. To evaluate the role of PKC in this process, normal coronary rings pretreated for a period of one hour with the phorbol ester, phorbol 12-myristate 13-acetate (PMA, 1 microM), resulted in a similar attenuation (36%) of ET-1 production of inositol phosphates. In the presence of the protein kinase C inhibitor staurosporine, both the agonist and phorbol ester induced decreases in ET-1 mediated PI turnover were reversed. Staurosporine even potentiated (75%) ET-1 induced PI turnover despite ET-1 and PMA pretreatments. These results suggest that agonist-induced desensitization of ET-1 mediated PI turnover can occur and is at least one of the possible mechanisms contributing to the desensitization of the ET-1 transmembrane signaling pathway in the pacing-overdrive model of heart failure in the dog.

journal_name

J Mol Cell Cardiol

journal_title

Journal of molecular and cellular cardiology

authors

Calderone A,Rouleau JL,de Champlain J,Bélichard P,Stewart DJ

doi

10.1006/jmcc.1993.1102

subject

Has Abstract

pub_date

1993-08-01 00:00:00

pages

895-903

issue

8

eissn

0022-2828

issn

1095-8584

pii

S0022-2828(83)71102-8

journal_volume

25

pub_type

杂志文章

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