Adenosine triphosphate facilitates the Na+-K+ pump of frog skeletal muscle fibres.

Adrenaline markedly increased the ouabain-sensitive 22Na+-efflux by stimulating the Na+-K+ pump in frog skeletal muscle. The facilitatory effects of adrenaline had the following properties. The effects of adrenaline on the ouabain-sensitive Na+-efflux were observed at concentrations greater than 0.1 microM and the magnitude increased with concentration up to 10 microM. At a concentration of 30 microM, adrenaline markedly augmented the ouabain-sensitive Na+-efflux, but other biogenic amines were less effective (noradrenaline and dopamine) or ineffective (histamine and serotonin). The increase of Na+-efflux induced by 1 microM adrenaline was blocked by 3 microM propranolol, but not by 3 microM phenoxybenzamine. The properties of the facilitatory action of adrenaline on the ouabain-sensitive Na+-efflux suggest that beta-adrenoceptors have an important role in modulating the Na+-K+ pump activity in the skeletal muscle membrane. The protein complex localized in excitable membranes, namely the Na+-K+ ATPase-beta-adrenoceptor complex, may be the functional unit which operates the membrane machinery driving the Na+-K+ pump.

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?-Adrenergic modulation of the Na+?K+ pump in frog skeletal muscles

Kaibara

Akasu

Tokimasa

et al. 1985

Pflugers Arch.

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Adenosine triphosphate facilitates the Na+-K+ pump of frog skeletal muscle fibres.

Cited by 1 publication

References 10 publications

?-Adrenergic modulation of the Na+?K+ pump in frog skeletal muscles

?-Adrenergic modulation of the Na+?K+ pump in frog skeletal muscles

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