Comparison of combinatory effects of PCBs (118, 138, 153 and 180) with 17 beta-estradiol on proliferation and apoptosis in MCF-7 breast cancer cells.
We analyzed whether polychlorinated biphenyls (PCBs) interfere with the activity of 17 β-estradiol in the proliferation and apoptosis of the MCF-7 cell line. MCF-7 cells were cultured in Dulbecco's modified Eagle's medium (DMEM) without phenol red supplemented with 5% charcoal-treated fetal bovine serum (CD-FBS) for 3 days with 10 nM 17 β-estradiol or 0.1 µM, 0.5 µM and 1 µM of the tested PCB congeners (118, 138, 153 and 180), or both. Cell proliferation was determined by measuring 5-bromo-2'-deoxyuridine (BrdU) incorporation, and cell apoptosis was measured by caspase-9 activity. From the PCB congeners tested, PCB138 and 153 had the highest stimulatory effects on basal cell proliferation as well as the highest inhibitory actions on basal caspase-9 activity. The proliferative and anti-apoptotic actions of PCB138 and 153 were still observed in the presence of 17 β-estradiol, while the actions of PCB118 and 180 were reversed. In conclusion, the results of this study suggest the possibility that PCB138 and 153 contribute to the action of endogenous 17 β-estradiol on cell proliferation and apoptosis in the breast cancer cell line MCF-7.
Department of Physiology and Toxicology of Reproduction, Chair of Animal Physiology, Institute of Zoology, Jagiellonian University, Kraków, Poland. anna.ptak@uj.edu.pl
Anna
A
Ptak
Karolina
K
Mazur
Ewa L
EL
Gregoraszczuk
D017209:Apoptosis / Q000187:drug effects*; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D001973:Bromodeoxyuridine / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D004958:Estradiol / Q000633:toxicity*; D005260:Female; D006801:Humans; D011078:Polychlorinated Biphenyls / Q000633:toxicity*
D004958:Estradiol; D011078:Polychlorinated Biphenyls; D001973:Bromodeoxyuridine