title: Synergistic antiproliferative effect of human recombinant interferons and retinoic acid in cultured breast cancer cells.
abstract: A combination of retinoic acid (RA) and human recombinant DNA-derived interferon-gamma (Hu-IFN-gamma) was tested with respect to the growth inhibitory action on several human mammary carcinoma cell lines (ZR-75.1, 734-B, MCF-7, and BT-20), a human lung carcinoma cell line (CCL-185), and a human laryngeal carcinoma cell line (HEP-2). The mammary carcinoma cell lines were all sensitive to Hu-IFN-gamma, and 2 of them (ZR-75.1 and 734-B) were also affected by RA. The combination of both substances led to a pronounced synergistic amplification of growth inhibition in ZR-75.1 and 734-B cells. RA also increased the antiproliferative activity of Hu-IFN-gamma in the RA-resistant BT-20 cells and to a less pronounced degree in MCF-7 cells. In contrast to these findings, no synergistic effects were observed between Hu-IFN-gamma and RA in CCL-185 and HEP-2 cells. Human recombinant DNA-derived interferon-alpha 2 amplified the action of RA only in BT-20 cells, but it did not act synergistically with RA in the other cell lines tested.
mesh_terms: D001943:Breast Neoplasms / Q000473:pathology*; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D004351:Drug Resistance; D004357:Drug Synergism; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology*; D011994:Recombinant Proteins / Q000494:pharmacology; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: D011994:Recombinant Proteins; D014212:Tretinoin; D007371:Interferon-gamma