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2009 ; 50
(3-4
): 89-97
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Caffeine inhibits InsP3 responses and capacitative calcium entry in canine
pulmonary arterial smooth muscle cells
#MMPMID19084078
Hume JR
; McAllister CE
; Wilson SM
Vascul Pharmacol
2009[Mar]; 50
(3-4
): 89-97
PMID19084078
show ga
Caffeine is a well described and characterized ryanodine receptor (RyR)
activator. Previous evidence from independent research studies also indicate
caffeine inhibits InsP3 receptor functionality, which is important to activation
of capacitative Ca2+ entry (CCE) in some cell types. In addition, RyR activation
elicits excitatory-coupled Ca2+ entry (ECCE) in skeletal muscle myotubes. Recent
studies by our group show that canine pulmonary arterial smooth muscle cells
(PASMCs) have functional InsP3 receptors as well as RyRs, and that CCE is
dependent on InsP3 receptor activity. The potential for caffeine to activate ECCE
as well as inhibit InsP3 receptor function and CCE was examined using fura-2
fluorescent imaging in canine PASMCs. The data show caffeine causes transient as
well as sustained cytosolic Ca2+ increases, though this is not due to CCE or ECCE
activity as evidenced by a lack of an increase in Mn2+ quench of fura-2. The
experiments also show caffeine reversibly inhibits 5-HT elicited-InsP3 mediated
Ca2+ responses with an IC50 of 6.87x10(-4) M and 10 mM caffeine fully inhibits
CCE. These studies provide the first evidence that caffeine is an inhibitor of
InsP3 generated Ca2+ signals and CCE in PASMCs.