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• W2103229713 abstract "L-type Ca2+ current (ICa-L) triggers Ca2+ release from the sarcoplasmic reticulum (SR) and both SR and ICa-L are potential sources of intracellular Ca2+ (Ca2+i) for feedback regulation of ICa-L. Ca2+i bound to calmodulin (Ca2+-CaM) can inhibit ICa-L, while Ca2+-CaM can also activate Ca2+-CaM-dependent protein kinase II (CaMK) to increase ICa. However, it is not known whether ICa-L or the SR is the primary source of Ca2+ for ICa-L regulation. The L-type Ca2+ channel C terminus is implicated as a critical transduction element for ICa-L responses to Ca2+-CaM and CaMK, and the C terminus undergoes voltage-dependent steric changes, suggesting that Ca2+i control of ICa-L may also be regulated by cell membrane potential. We developed conditions to separately test the relationship of Ca2+-CaM and CaMK to ICa-L and SR Ca2+i release during voltage clamp conditions modelled upon time and voltage domains relevant to the cardiac action potential. Here we show that CaMK increases ICa-L after brief positive conditioning pulses, whereas Ca2+-CaM reduces ICa-L over a broad range of positive and negative conditioning potentials. SR Ca2+ release was required for both Ca2+-CaM and CaMK ICa-L responses after strongly positive conditioning pulses (+10 and +40 mV), while Ca2+i from ICa-L was sufficient for Ca2+-CaM during weaker depolarizations. These findings show that ICa-L responses to CaMK are voltage dependent and suggest a new model of L-type Ca2+ channel regulation where voltage-dependent changes control ICa-L responses to Ca2+-CaM and CaMK signalling." @default.
• W2103229713 created "2016-06-24" @default.
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• W2103229713 date "2003-12-10" @default.
• W2103229713 modified "2023-10-17" @default.
• W2103229713 title "Calmodulin kinase is functionally targeted to the action potential plateau for regulation of L-type Ca²⁺current in rabbit cardiomyocytes" @default.
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• W2103229713 doi "https://doi.org/10.1113/jphysiol.2003.053314" @default.
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