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Suppression of basal plasma cortisol and adrenal androgen concentrations, but not of ACTH and cortisol responses to hCRH by low-dose dexamethasone in rhesus monkeys

Suppression of basal plasma cortisol and adrenal androgen concentrations, but not of ACTH and cortisol responses to hCRH by low-dose dexamethasone in rhesus monkeys

Journal of Steroid Biochemistry 30(1-6): 435-437

ISSN/ISBN: 0022-4731

PMID: 2838697

DOI: 10.1016/0022-4731(88)90137-9

Glucocorticoid treatment at replacement doses does not result in a suppression of ACTH and cortisol responses to corticotropin-releasing hormone (CRH), while basal plasma concentrations of cortisol and adrenal androgens are efficiently suppressed 34 h after starting treatment. This finding could be demonstrated in rhesus monkeys receiving a continuous infusion of dexamethasone (1 microgram/kg per h) for 48 h and confirms our observations in patients on alternate-day prednisone therapy and in patients with congenital adrenal hyperplasia on glucocorticoid replacement therapy. We conclude that the decrease of basal adrenal steroid secretion resulting from glucocorticoid replacement therapy represents an effect on hypothalamic rather than on pituitary function.

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Accession: 041491320

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