Adrenocortical function: Corticosterone levels in female BALB/c and C3H mice under various conditions

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Abstract
A diurnal rhythmicity in plasma corticosterone levels was demonstrated in female BALB/cCrgl and C3H/Crgl mice, with and without mammary tumor virus. Removal of the adrenals followed by metopirone treatment reduced circulating corticoid to non-detectable levels in C3H but not in BALB/c mice. Dexamethasone reduced but did not abolish corticosteroid secretion in both strains. Neonatal exposure to exogenous hormones failed to cause any obvious change in corticoid levels. Bilateral ovariectomy of these neonatally treated mice at 40 days of age resulted in a subsequent lowering of plasma corticoid levels when compared with intact animals.