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The Journal of Clinical Endocrinology & Metabolism Vol. 86, No. 4 1738-1745
Copyright © 2001 by The Endocrine Society

Original Studies

Identification, Characterization, and Biological Activity of Specific Receptors for Natural (Ghrelin) and Synthetic Growth Hormone Secretagogues and Analogs in Human Breast Carcinomas and Cell Lines1

Paola Cassoni, Mauro Papotti, Corrado Ghè, Filomena Catapano, Anna Sapino, Andrea Graziani, Romano Deghenghi, Thomas Reissmann, Ezio Ghigo and Giampiero Muccioli

Departments of Biomedical Sciences and Oncology (P.C., M.P., A.S.), Anatomy, Pharmacology and Forensic Medicine (C.G., F.C., G.M.), and Internal Medicine (E.G.), University of Turin, 10126 Turin, Italy; Department of Medical Sciences (A.G.), University of Piemonte Orientale, 28100 Novara, Italy; Cancer Research and Experimental Endocrinology, Asta Medica (T.R.), 60269 Frankfurt am Main, Germany; and Europeptides (R.D.), 95108 Argenteuil, France

Address all correspondence and requests for reprints to: Paola Cassoni, M.D., Department of Biomedical Sciences and Oncology, University of Turin, Via Santena 7, 10126 Turin, Italy. E-mail: paola.cassoni{at}unito.it

The family of GH secretagogues (GHS) includes synthetic peptidyl (hexarelin) and nonpeptidyl (MK-0677) molecules possessing specific receptors in the pituitary and central nervous system as well as in peripheral tissues, including the heart and some endocrine organs. A gastric-derived peptide, named ghrelin, has recently been proposed as the natural ligand of the GHS receptors (GHS-Rs). The presence of specific GHS-Rs has now been investigated in nontumoral and neoplastic human breast tissue using a radioiodinated peptidyl GHS ([125I]-Tyr-Ala-hexarelin) as ligand. Specific binding sites for GHS were detected in membranes from several types of breast carcinomas, whereas a negligible binding was found in fibroadenomas and mammary parenchyma. The highest binding activity was found in well-differentiated (G1) invasive breast carcinomas and was progressively reduced in moderately (G2) to poorly (G3) differentiated tumors. [125I]-Tyr-Ala-hexarelin bound to tumor membranes was displaced by different unlabeled GHS such as hexarelin, Tyr-Ala-hexarelin, human ghrelin, and MK-0677 as well as by desoctanoyl-ghrelin and hexarelin derivative EP-80317, which are devoid of GH-releasing properties in vivo. In contrast, no competition was seen between radiolabeled Tyr-Ala-hexarelin and some peptides (CRF and insulin-like growth factor I) structurally and functionally unrelated to hexarelin or when GHRH and SRIF were tested in the displacement studies. The presence of specific GHS binding sites was also demonstrated in three different human breast carcinoma cell lines (MCF7, T47D, and MDA-MB231), in which, surprisingly, no messenger RNA for GHS-R1a was demonstrated by RT-PCR. In these cell lines, ghrelin (as well as hexarelin, MK-0677, EP-80317, and even desoctanoyl ghrelin) caused a significant inhibition of cell proliferation at concentrations close to their binding affinity. In conclusion, this study provides the first demonstration of specific GHS binding sites, other than GHS-R1, in breast cancer. These receptors probably mediate growth inhibitory effects on breast carcinoma cells in vitro.




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