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- W2115425140 abstract "Constitutive activating mutations of G protein-coupled receptors, such as that of TSH, have been implicated in the tumorigenesis of human endocrine neoplasms, such as thyroid adenomas. In a previous study we reported that constitutive activating point mutations of the ACTH receptor (ACTH-R) gene, a member of the G protein-coupled receptor superfamily, were not present in hormone-secreting and nonsecretory adrenocortical neoplasms. In this study, we investigated whether allelic loss of the ACTH-R gene is present in sporadic adrenal tumors. We identified a PstI polymorphism in the promoter region 3 kilobases upstream of the coding region of the ACTH-R gene. The rate of heterozygosity for this polymorphism in 99 unrelated Caucasian individuals was 53.5%. Using this polymorphism, we analyzed loss of heterozygosity (LOH) of the ACTH-R gene in 20 informative cases with benign and malignant adrenocortical tumors. Of 16 patients with benign lesions, LOH was present in 1 oncocytic nonfunctional adenoma, but not in 15 hyperfunctioning adenomas. Of 4 informative patients with adrenocortical carcinomas, LOH was present in 2 cases. Both patients had advanced tumor stages and showed a more rapid course than carcinoma patients without LOH. Analysis of the flanking region of the ACTH-R using the polymorphic microsatelite marker D18S37 and D18S40 showed that this deletion was confined to the ACTH-R gene. Northern blot experiments demonstrated reduced expression of ACTH-R messenger ribonucleic acid in the tumors with LOH of the ACTH-R gene, suggesting functional significance of this finding at the transcriptional level. We conclude that LOH of the ACTH-R gene is possibly involved in adrenal tumorigenesis, contributing to cellular dedifferentiation in adenomas and carcinomas." @default.
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- W2115425140 date "1997-09-01" @default.
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- W2115425140 title "Deletion of the Adrenocorticotropin Receptor Gene in Human Adrenocortical Tumors: Implications for Tumorigenesis1" @default.
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- W2115425140 doi "https://doi.org/10.1210/jcem.82.9.4211" @default.
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