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- W2017093695 abstract "The putative stimulation of adrenal steroid production by immunoglobulins (Igs) of five patients with pigmented adrenocortical micronodular dysplasia and clinical Cushing's syndrome was investigated. Ascorbate depletion, a process linked to steroid production, was measured by a cyto-chemical bioassay employing guinea pig adrenal explants in organ culture and exposed to IgG from the patients and normal subjects. We also measured cortisol production by these segments during a 5-h culture period using a RIA. For positive reference values we studied the effects of ACTH-(1-39), ACTH-(1-24), ACTH-(11-24), and ACTH-(18-39) on in vitro ascorbate depletion and cortisol production. Both ACTH-(1-39) and ACTH-(1-24) depleted ascorbate and stimulated cortisol production in adrenal cells. The dose-response kinetics of the peptides were bell-shaped; maximal responses were reached in both instances at 1 fmol/L to 10 pmol/L. In all tests, stimulation of in vitro cortisol production was paralleled by ascorbate depletion. ACTH-(18-39) also stimulated ascorbate depletion and cortisol production, but at one concentration only (100 fmol/L), and TSH and LH had no effect. Protein-A-Sepharose-purified IgG preparations of the five patients stimulated ascorbate depletion and/or cortisol production in a dose-dependent fashion; however, the responses occurred over a narrow concentration range (15-150 micrograms IgG/mL culture fluid). These observations support the hypothesis that the hypercortisolism of the syndrome of pigmented adrenocortical micronodular dysplasia is due to circulating Igs that stimulate adrenal steroidogenesis." @default.
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- W2017093695 date "1988-02-01" @default.
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- W2017093695 title "Immunoglobulins of Patients with Cushing's Syndrome due to Pigmented Adrenocortical Micronodular Dysplasia Stimulate<i>in Vitro</i>Steroidogenesis*" @default.
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- W2017093695 doi "https://doi.org/10.1210/jcem-66-2-301" @default.
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