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2015 ; 29
(6
): 896-908
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Inhibition of Sphingosine Kinase 1 Ameliorates Angiotensin II-Induced
Hypertension and Inhibits Transmembrane Calcium Entry via Store-Operated Calcium
Channel
#MMPMID25871850
Wilson PC
; Fitzgibbon WR
; Garrett SM
; Jaffa AA
; Luttrell LM
; Brands MW
; El-Shewy HM
Mol Endocrinol
2015[Jun]; 29
(6
): 896-908
PMID25871850
show ga
Angiotensin II (AngII) plays a critical role in the regulation of vascular tone
and blood pressure mainly via regulation of Ca(2+) mobilization. Several reports
have implicated sphingosine kinase 1 (SK1)/sphingosine 1-phosphate (S1P) in the
mobilization of intracellular Ca(2+) through a yet-undefined mechanism. Here we
demonstrate that AngII-induces biphasic calcium entry in vascular smooth muscle
cells, consisting of an immediate peak due to inositol tris-phosphate-dependent
release of intracellular calcium, followed by a sustained transmembrane Ca(2+)
influx through store-operated calcium channels (SOCs). Inhibition of SK1
attenuates the second phase of transmembrane Ca(2+) influx, suggesting a role for
SK1 in AngII-dependent activation of SOC. Intracellular S1P triggers
SOC-dependent Ca(2+) influx independent of S1P receptors, whereas external
application of S1P stimulated S1P receptor-dependent Ca(2+) influx that is
insensitive to inhibitors of SOCs, suggesting that the SK1/S1P axis regulates
store-operated calcium entry via intracellular rather than extracellular actions.
Genetic deletion of SK1 significantly inhibits both the acute hypertensive
response to AngII in anaesthetized SK1 knockout mice and the sustained
hypertensive response to continuous infusion of AngII in conscious animals.
Collectively these data implicate SK1 as the missing link that connects the
angiotensin AT1A receptor to transmembrane Ca(2+) influx and identify SOCs as a
potential intracellular target for SK1.