Steroids. 1979 Oct;34(4):471-6.

Dexamethasone suppressibility of plasma pregnenolone or dehydroepiandrosterone in gonadectomized patients.

Nishida S, Matsumura S, Horino M, Matsuki M, Oyama H, Tenku A, Kakita K, Tanaka H, Omukai Y.

Abstract

The 9 AM dexamethasone suppression test was carried out in gonadectomized patients, and plasma pregnenolone or dehydroepiandrosterone (DHA) was radioimmunoassayed following various amounts of dexamethasone administration. Pregnenolone, as well as the plasma ACTH level, was completely suppressed with 1 mg dexamethasone, whereas 4 mg or 8 mg of dexamethasone was needed to induce a complete DHA suppression. These findings suggest that the gonads alone contribute to the poor dexamethasone suppressibility of pregnenolone in normal subjects, and that adrenal DHA secretion might be also regulated by an unidentified factor other than ACTH, which would be suppressed with large doses of dexamethasone.

PMID:: 229589; [PubMed - indexed for MEDLINE]

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Dexamethasone suppressibility of plasma pregnenolone or dehydroepiandrosterone i...
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Dexamethasone suppressibility of plasma pregnenolone or dehydroepiandrosterone in gonadectomized patients.

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