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  • Title: Loss of growth hormone secretagogue receptor 1a and overexpression of type 1b receptor transcripts in human adrenocortical tumors.
    Author: Barzon L, Pacenti M, Masi G, Stefani AL, Fincati K, Palù G.
    Journal: Oncology; 2005; 68(4-6):414-21. PubMed ID: 16020971.
    Abstract:
    OBJECTIVE AND METHODS: Quantitative analysis of mRNA expression of ghrelin and its receptors GHS-R1a and -R1b in a large series of normal and neoplastic human adrenocortical tissues. Evaluation of the effects of ghrelin on GHS-R expression and proliferation of human adrenocortical carcinoma (ACC) cell lines. RESULTS: Ghrelin and GHS-R transcripts are expressed in normal adrenal cortex, with GHS-R1b mRNA levels being 5- to 10-fold higher than GHS-R1amRNA. A significant increase in ghrelin expression was observed in adrenocortical adenomas, but not in carcinomas. GHS-R1a was undetectable in about 60% of both benign and malignant tumor samples, except for cortisol-producing adenomas, which showed increased receptor expression. At variance, GHS-R1b was overexpressed in both benign and malignant adrenocortical tumors. In vitro studies in human ACC cell lines demonstrated that GHS-R1a is downregulated and GHS-R1bmRNA expression is upregulated by ghrelin, while inhibiting cell proliferation. CONCLUSION: Downregulation ofGHS-R1a in adrenal tumors and the presence of high levels of GHS-R1b transcripts in adrenocortical tissue suggest a role for these receptors in adrenal function and growth. In this regard, ghrelin inhibits cell proliferation and modulates GHS-R expression in ACC cells in vitro.
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