Effect of sphingosine-1-phosphate on L-type calcium current and Ca(2+) transient in rat ventricular myocytes.

Abstract:

:Modulation of Ca(2+) homoeostasis in cardiac myocytes plays a major role in beat-to-beat regulation of heart function. Previous studies suggest that sphingosine-1-phosphate (S1P), a biologically active sphingomyelin metabolite, regulates Ca(2+) handling in cardiac myocytes, but the underlying mechanism is unclear. In the present study, we tested the hypothesis that S1P-induced functional alteration of intracellular Ca(2+) handling includes the L-type calcium channel current (ICa,L) via a signalling pathway involving P21-activated kinase 1 (Pak1). Our results show that, in rat ventricular myocytes, S1P (100 nM) does not affect the basal activity of ICa,L but is able to partially reverse the effect of the β-adrenergic agonist Isoproterenol (ISO, 100 nM) on ICa,L. S1P (25 nM) also significantly prevents ISO (5 nM)-induced Ca(2+) waves and diastolic Ca(2+) release in these cells. Our further molecular characterisation demonstrates that Pak1 activity is increased in myocytes treated with S1P (25 nM) compared with those myocytes without treatment of S1P. By immunoprecipitation we demonstrate that Pak1 and protein phosphatase 2A (PP2A) are associated in ventricular tissue indicating their functional interaction. Thus the results indicate that S1P attenuates β-adrenergic stress-induced alteration of intracellular Ca(2+) release and L-type Ca(2+) channel current at least in part via Pak1-PP2A-mediated signalling.

journal_name

Mol Cell Biochem

authors

Egom EE,Bae JS,Capel R,Richards M,Ke Y,Pharithi RB,Maher V,Kruzliak P,Lei M

doi

10.1007/s11010-016-2752-8

subject

Has Abstract

pub_date

2016-08-01 00:00:00

pages

83-92

issue

1-2

eissn

0300-8177

issn

1573-4919

pii

10.1007/s11010-016-2752-8

journal_volume

419

pub_type

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