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- W2133569968 abstract "We studied a patient with food-induced, ACTH-independent, Cushing's syndrome and a unilateral adrenocortical adenoma. In vivo cortisol secretion was stimulated by mixed, glucidic, lipidic, or proteic meals. Plasma ACTH levels were undetectable, but iv injection of ACTH stimulated cortisol secretion. Unilateral adrenalectomy was followed by hypocortisolism with loss of steroidogenic responses to both food and ACTH. In vitro, cortisol secretion by isolated tumor cells was stimulated by the gut hormone gastric inhibitory polypeptide (GIP) and ACTH, but not by another gut hormone, glucagon-like peptide-1 (GLP-1). Both peptides stimulated the production of cAMP but not of inositol 1,4,5-trisphosphate. In quiescent cells, GIP and ACTH stimulated [3H]thymidine incorporation and p42-p44 mitogen-activated protein kinase activity. GIP receptor messenger ribonucleic acid (RNA), assessed by RT-PCR, was highly expressed in the tumor, whereas it was undetectable in the adjacent hypotrophic adrenal tissue, in two adrenal tumors responsible for food-independent Cushing's syndrome, and in two hyperplastic adrenals associated with ACTH hypersecretion. In situ hybridization demonstrated that expression of GIP receptor RNA was confined to the adrenocortical tumor cells. Low levels of ACTH receptor messenger RNA were also detectable in the tumor. We conclude that abnormal expression of the GIP receptor allows adrenocortical cells to respond to food intake with an increase in cAMP that may participate in the stimulation of both cortisol secretion and proliferation of the tumor cells." @default.
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- W2133569968 date "1998-09-01" @default.
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- W2133569968 title "Cushing’s Syndrome due to a Gastric Inhibitory Polypeptide-Dependent Adrenal Adenoma: Insights into Hormonal Control of Adrenocortical Tumorigenesis1" @default.
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- W2133569968 doi "https://doi.org/10.1210/jcem.83.9.5140" @default.
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