Effect of andrenalectomy on cyclic 3′,5′-guanosine monophosphate metabolism of rat liver and other tissues

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Abstract

Adrenalectomy increased guanyl cyclase and cyclic GMP phosphodiesterase activities in liver and other rat tissues. Liver guanyl cyclase activities from adrenalectomized rats were increased above those of normal controls according to kinetic analysis, gel filtration, ion-exchange chromatography, discontinuous sucrose gradient fractionation, sulfhydryl inhibition, and secretin activation. The effects of adrenal insufficiency on hepatic guanyl cyclase and cyclic GMP phosphodiesterase were prevented by cortisone acetate administration. Immunoassay of liver and skeletal muscle cyclic GMP after adrenalectomy showed markedly decreased levels in liver, but increased levels in skeletal muscle. In liver and other tissues, basal adenyl cyclase and cyclic AMP phosphodiesterase activities were unaffected by adrenalectomy. Hepatic levels of cyclic AMP were also unchanged by adrenalectomy. Hypophysectomy raised guanyl cyclase activity in liver but had no effect on liver cyclic GMP phosphodiesterase activity. These alterations are discussed in relation to possible glucocorticoid regulation of cyclic GMP metabolism.

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    Supported by USPHS Grants AM-05020 and AM-02456. W. J. Thompson was also the recipient of USPHS Postdoctoral Fellowship AM-50789.

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