Mechanism of β- adrenergic relaxation of smooth muscle

Abstract
The mechanism of .beta.-adrenergic relaxation was investigated in isolated Bufo marinus smooth muscle cells. .beta.-Adrenergic agents [in this case isoprenaline] stimulate cyclic AMP-dependent protein phosphorylation, enhance Na+/K+ transport and induce relaxation. The stimulation of Na+/K+ transport is obligatory for relaxation; this stimulation induces relaxation through enhanced Na+/Ca2+ exchange.

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