ATP promotes NCX-reversal in aortic smooth muscle cells by DAG-activated Na+ entry.

Abstract:

:Reversal of the plasma membrane Na(+)/Ca(2+) exchanger (NCX) has been shown to mediate Ca(2+) influx in response to activation of G-protein linked receptors. Functional coupling of reverse-mode NCX with canonical transient receptor potential channels (TRPC), specifically TRPC6, has recently been demonstrated by our laboratory to mediate Ca(2+) influx in rat aortic smooth muscle cells (RASMCs) following ATP stimulation. In this communication, we provide further detail of this functional coupling by indirectly measuring NCX reversal. We found that NCX reversal, induced by the removal of extracellular Na(+), was increased following stimulation with ATP and the diacylglycerol analog 1-Oleoyl-2-acetyl-sn-glycerol. This increased NCX reversal was attenuated by SKF-96365, an inhibitor of non-selective cation channels, and by activation of protein kinase C with phorbol ester 12-tetradecanoylphorbol-13 acetate. These data are consistent with the known properties of TRPC6 and further support that functional coupling of TRPC6 and NCX occurs via a receptor-operated, rather than store-operated, cascade in RASMCs.

authors

Syyong HT,Poburko D,Fameli N,van Breemen C

doi

10.1016/j.bbrc.2007.04.080

subject

Has Abstract

pub_date

2007-06-15 00:00:00

pages

1177-82

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(07)00816-9

journal_volume

357

pub_type

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