Influence of luteinizing hormone-releasing hormone agonists on human mammary carcinoma cell lines and their xenografts
| Autor: | J Sugar, D Daubner, Janos Seprodi, I Palyi, I. Számel, Istvan Teplan, T. Kremmer, I Bodrogi, I. Mezö, B. Vincze |
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| Rok vydání: | 1991 |
| Předmět: |
Agonist
medicine.medical_specialty medicine.drug_class Endocrinology Diabetes and Metabolism Clinical Biochemistry Transplantation Heterologous Breast Neoplasms Mice Inbred Strains Receptors Estradiol Biology Biochemistry Gonadotropin-Releasing Hormone Mice Endocrinology In vivo Internal medicine medicine Tumor Cells Cultured Animals Humans skin and connective tissue diseases Receptor Molecular Biology Estradiol Cell Biology In vitro Cell culture Cancer cell Cancer research Molecular Medicine Luteinizing hormone Receptors Progesterone Hormone |
| Zdroj: | The Journal of steroid biochemistry and molecular biology. 38(2) |
| ISSN: | 0960-0760 |
| Popis: | 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 antitumour action of the LH-RH agonist. |
| Databáze: | OpenAIRE |
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