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• W2104956671 abstract "Ryanodine is a selective ryanodine receptor (RyR) blocker, with binding dependent on RyR opening. In whole-cell studies, ryanodine binding can lock the RyR in an open-conductance state, short-circuiting the sarcoplasmic reticulum, which restricts studies of inositol-1,4,5-trisphosphate receptor (InsP₃R) activity. Other RyR blockers have nonselective effects that also limit their utility. 4-(2-Aminopropyl)-3,5-dichloro-<i>N</i>,<i>N</i>-dimethylaniline (FLA 365) blocks RyR-elicited Ca²⁺ increases in skeletal and cardiac muscle; yet, its actions on smooth muscle are unknown. Canine pulmonary arterial smooth muscle cells (PASMCs) express both RyRs and InsP₃Rs; thus, we tested the ability of FLA 365 to block RyR- and serotonin-mediated InsP₃ R-elicited Ca²⁺ release by imaging fura-2-loaded PASMCs. Acute exposure to 10 mM caffeine, a selective RyR activator, induced Ca²⁺ increases that were reversibly reduced by FLA 365, with an estimated IC₅₀ of ∼1 to 1.5 μM, and inhibited by 10 μM ryanodine or 10 μM cyclopiazonic acid. FLA 365 also blocked L-type Ca²⁺ channel activity, with 10 μM reducing Ba²⁺ current amplitude in patch voltage-clamp studies to 54 ± 6% of control and 100 μM FLA 365 reducing membrane current to 21 ± 6%. InsP₃R-mediated Ca²⁺ responses elicited by 10 μM 5-hydroxytryptamine (serotonin) in canine PASMCs and 100 μM carbachol in human embryonic kidney (HEK)-293 cells were not reduced by 2 μM FLA 365, but they were reduced by 20 μM FLA 365 to 76 ± 9% of control in canine PASMCs and 52 ± 1% in HEK-293 cells. Thus, FLA 365 preferentially blocks RyRs with limited inhibition of L-type Ca²⁺ channels or InsP₃R in canine PASMCs." @default.
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• W2104956671 date "2007-07-19" @default.
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• W2104956671 title "Inhibition of Ryanodine Receptors by 4-(2-Aminopropyl)-3,5-dichloro-<i>N</i>,<i>N</i>-dimethylaniline (FLA 365) in Canine Pulmonary Arterial Smooth Muscle Cells" @default.
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• W2104956671 doi "https://doi.org/10.1124/jpet.107.122119" @default.
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