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Regulation of l ornithine decarboxylase activity in the thymus and liver of rats by adrenal hormones


, : Regulation of l ornithine decarboxylase activity in the thymus and liver of rats by adrenal hormones. Cytobios 45(180): 25-34

The activity of L-ornithine decarboxylase (EC 4.1.1.17, ODC) has become a useful indicator of hormone responsiveness. Various regimens of dexamethasone, aldosterone and epinephrine, alone or in combination, were administered to adrenalectomized rats either in acute or chronic doses. In addition, adrenalectomized rats, which were chronically treated with aldosterone and epinephrine, were given a single injection of 50 .mu.g dexamethasone and sacrificed at various time intervals after hormone treatment. Hepatic and thymic ODC activity was measured. The expected dexamethasone effect, an increase in hepatic and a decrease in thymic ODC, was observed. This study also revealed that aldosterone induced similar responses in these tissues. Epinephrine had the opposite effect since chronic administration of dexamethasone or aldosterone with epinephrine resulted in control levels of ODC. Furthermore, when aldosterone and epinephrine were chronically administered to adrenalectomized rats, to study the acute effects of dexamethasone on rat thymus and liver, the time course of the response in each tissue was found to be distinct. The influence of the adrenal gland on rat thymus and liver is not restricted only to glucocorticoids, but may also involve other hormones which it secretes.

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