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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2016 ; 291
(40
): 21148-21159
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Orai1 and TRPC1 Proteins Co-localize with CaV1 2 Channels to Form a Signal
Complex in Vascular Smooth Muscle Cells
#MMPMID27535226
Ávila-Medina J
; Calderón-Sánchez E
; González-Rodríguez P
; Monje-Quiroga F
; Rosado JA
; Castellano A
; Ordóńez A
; Smani T
J Biol Chem
2016[Sep]; 291
(40
): 21148-21159
PMID27535226
show ga
Voltage-dependent Ca(V)1.2 L-type Ca(2+) channels (LTCC) are the main route for
calcium entry in vascular smooth muscle cells (VSMC). Several studies have also
determined the relevant role of store-operated Ca(2+) channels (SOCC) in vascular
tone regulation. Nevertheless, the role of Orai1- and TRPC1-dependent SOCC in
vascular tone regulation and their possible interaction with Ca(V)1.2 are still
unknown. The current study sought to characterize the co-activation of SOCC and
LTCC upon stimulation by agonists, and to determine the possible crosstalk
between Orai1, TRPC1, and Ca(V)1.2. Aorta rings and isolated VSMC obtained from
wild type or smooth muscle-selective conditional Ca(V)1.2 knock-out
(Ca(V)1.2(KO)) mice were used to study vascular contractility, intracellular
Ca(2+) mobilization, and distribution of ion channels. We found that serotonin
(5-HT) or store depletion with thapsigargin (TG) enhanced intracellular free
Ca(2+) concentration ([Ca(2+)](i)) and stimulated aorta contraction. These
responses were sensitive to LTCC and SOCC inhibitors. Also, 5-HT- and TG-induced
responses were significantly attenuated in Ca(V)1.2(KO) mice. Furthermore,
hyperpolarization induced with cromakalim or valinomycin significantly reduced
both 5-HT and TG responses, whereas these responses were enhanced with LTCC
agonist Bay-K-8644. Interestingly, in situ proximity ligation assay revealed that
Ca(V)1.2 interacts with Orai1 and TRPC1 in untreated VSMC. These interactions
enhanced significantly after stimulation of cells with 5-HT and TG. Therefore,
these data indicate for the first time a functional interaction between Orai1,
TRPC1, and Ca(V)1.2 channels in VSMC, confirming that upon agonist stimulation,
vessel contraction involves Ca(2+) entry due to co-activation of Orai1- and
TRPC1-dependent SOCC and LTCC.