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.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Syyong HT,Poburko D,Fameli N,van Breemen Cdoi
10.1016/j.bbrc.2007.04.080subject
Has Abstractpub_date
2007-06-15 00:00:00pages
1177-82issue
4eissn
0006-291Xissn
1090-2104pii
S0006-291X(07)00816-9journal_volume
357pub_type
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