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10.1016/j.vph.2008.11.001

http://scihub22266oqcxt.onion/10.1016/j.vph.2008.11.001
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C2667157!2667157!19084078
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suck abstract from ncbi


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pmid19084078      Vascul+Pharmacol 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[]; 50 (3-4): 89-97 PMID19084078show 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 6.87 × 10?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.
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