Influence of luteinizing hormone-releasing hormone agonists on human mammary carcinoma cell lines and their xenografts

Borbála Vincze, István Pályi, Dóra Daubner, Tibor Kremmer, Irene Számel, István Bodrogi, János Sugár, János Seprődi, Imre Mező, István Teplán, Sándor Eckhardt

Research output: Article

27 Citations (Scopus)

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 [ 3 H]Ovurelin [d- 3 H-Phe 6 ),des-Gly 10 -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-Phe 6 ),des-Gly 10 -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.

Original languageEnglish
Pages (from-to)119-126
Number of pages8
JournalJournal of Steroid Biochemistry and Molecular Biology
Volume38
Issue number2
DOIs
Publication statusPublished - febr. 1991

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Endocrinology
  • Clinical Biochemistry
  • Cell Biology

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