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Beta-adrenoceptor activates KCNMA1. 2 / 2
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"These results suggest that beta-adrenoceptor stimulation increases maxi-K channel activity via a membrane delimited pathway, probably through pertussis toxin sensitive G protein (Gi)."

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"We conclude that the BK channel in cerebrovascular smooth muscle cells can be activated by beta-adrenoceptor stimulation, that the effect depends strongly on [Ca2+] i, and that the effect is mediated by cAMP dependent protein kinase A with no important contribution from a direct G protein or phosphorylation independent mechanism."