title: 13-cis retinoic acid and all-trans retinoic acid in the regulation of the proliferation and survival of human breast cancer cell line MCF-7.
abstract: Retinoids are a group of compounds which inhibit cell proliferation and induce cellular differentiation. The aim of this study was to compare the antiproliferative activity of various concentrations of 13-cis retinoic acid (isotretinoin) and all-trans retinoic acid (tretinoin) in a culture of the estrogen-sensitive human breast cancer cell line MCF-7. Evaluation was based on [3H]thymidine incorporation into the cancer cells and through immunocytochemical analysis of cell cycle-associated PCNA and Ki-67 protein expression. Both retinoids inhibited [3H]thymidine incorporation into the cancer cells most effectively at a concentration of 3x10(-3) M. Two basic substances used for line MCF-7 culture experiments, one stimulating - estradiol - and the other inhibiting - tamoxifen - were applied. Estradiol added to a culture containing decreasing concentrations of isotretinoin (from 3x10(-3) to 3x10(-8) M) caused a statistically significant reduction in the percentage of [3H]thymidine incorporation into the cancer cell line MCF-7, compared to the 17 beta estradiol group (189.25%+/-62.64, control=100%, p<0.05). In the group of decreasing tretinoin concentrations, statistically significant differences were found only at 3x10(-3), 3x10(-4) and 3x10(-8) M. Following culture supplementation with tamoxifen (1 microM), statistically significant differences were observed only at the highest concentrations of both retinoids (3x10(-3) and 3x10(-4) M). The evaluation of breast carcinoma cells with a positive immunocytochemical reaction to PCNA and Ki-67 has revealed that isotretinoin reduces their percentage in the most determined and statistically significant way (38.00%+/-2.58 and 39.25%+/-3.09), compared to the control group (86.50%+/-9.20 and 100%+/-3.87, p<0.001 and p<0.0001) and to the estradiol group (87.00%+/-6.79 and 86.10%+/-7.0, p<0.001). Apart from their blocking effect on the cell cycle, retinoids also induce the apoptotic pathway.
authors.affiliation: Department of Gynaecological Endocrinology, Medical Academy of Białystok, 15-276 Białystok, M. Sklodowskiej-Curie 24 A, Poland.
authors.forename: E
authors.initials: E
authors.lastname: Czeczuga-Semeniuk
authors.forename: S
authors.initials: S
authors.lastname: Wolczyński
authors.forename: J
authors.initials: J
authors.lastname: Dziecioł
authors.forename: M
authors.initials: M
authors.lastname: Dabrowska
authors.forename: T
authors.initials: T
authors.lastname: Anchim
authors.forename: I
authors.initials: I
authors.lastname: Tomaszewska
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D018931:Antineoplastic Agents, Hormonal / Q000494:pharmacology; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D004958:Estradiol / Q000494:pharmacology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D015474:Isotretinoin / Q000494:pharmacology*; D019394:Ki-67 Antigen / Q000378:metabolism; D009376:Neoplasms, Hormone-Dependent / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D013629:Tamoxifen / Q000494:pharmacology; D013936:Thymidine / Q000378:metabolism; D014212:Tretinoin / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D018931:Antineoplastic Agents, Hormonal; D019394:Ki-67 Antigen; D018809:Proliferating Cell Nuclear Antigen; D013629:Tamoxifen; D004958:Estradiol; D014212:Tretinoin; D015474:Isotretinoin; D013936:Thymidine