title: Influence of luteinizing hormone-releasing hormone agonists on human mammary carcinoma cell lines and their xenografts.
abstract: The specific binding of luteinizing hormone-releasing hormone (LH-RH) agonist in estradiol-dependent MCF-7 and estradiol-independent MDA-MB-231 human breast cancer cells has been studied using [3H]Ovurelin [(D-3H-Phe6),des-Gly10-LH-RH- ethylamide]. The results of Scatchard analyses suggest the presence of a single class of receptor sites, both in cell suspensions and membrane fractions. Evaluation of these peptide receptors appears to reflect additional characteristics of biological behaviour of these human breast cancer cells. The synthetic LH-RH agonist Ovurelin [(D-Phe6),des-Gly10-LH-RH-ethylamide] can directly interfere (25-30%) with the proliferation of MDA-MB-231 human breast cancer cells in culture. The inhibitory effect of Ovurelin in vitro was negligible in the MCF-7 cell line. In the in vivo experiments the treated immunosuppressed mice bearing either MCF-7 or MDA-MB-231 xenografts responded to the high-dose LH-RH analogue Zoladex depot and Decapeptyl depot therapy. Since the MDA-MB-231 tumour was found to be ER-negative it seems possible that the regression of this xenograft results from the direct antitumor action of the LH-RH agonist.
authors.affiliation: National Institute of Oncology, Budapest, Hungary.
authors.forename: B
authors.initials: B
authors.lastname: Vincze
authors.forename: I
authors.initials: I
authors.lastname: Pályi
authors.forename: D
authors.initials: D
authors.lastname: Daubner
authors.forename: T
authors.initials: T
authors.lastname: Kremmer
authors.forename: I
authors.initials: I
authors.lastname: Számel
authors.forename: I
authors.initials: I
authors.lastname: Bodrogi
authors.forename: J
authors.initials: J
authors.lastname: Sugár
authors.forename: J
authors.initials: J
authors.lastname: Seprödi
authors.forename: I
authors.initials: I
authors.lastname: Mezö
authors.forename: I
authors.initials: I
authors.lastname: Teplán
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000378:metabolism*; D004958:Estradiol / Q000378:metabolism; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives* / Q000494:pharmacology; D006801:Humans; D051379:Mice; D008815:Mice, Inbred Strains; D011959:Receptors, Estradiol / Q000378:metabolism*; D011980:Receptors, Progesterone / Q000378:metabolism*; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
chemical_list: D011959:Receptors, Estradiol; D011980:Receptors, Progesterone; C062312:ovurelin; D007987:Gonadotropin-Releasing Hormone; D004958:Estradiol