transcriptional effects of organochlorine o,p′-ddt and its metabolite p,p′-dde in transfected mda-mb 231 and mcf-7 breast cancer cell lines
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abstract
background: the organochlorine ddt has estrogenic activity but the mechanism underlying the estrogenic activity of this pesticide remains unclear. in the present investigation here, we studied the transcriptional effects of a synthetic organochlorine pesticide o,p’-ddt [1.1.1.-trichloro-2-(o-chlorophenyl)-2-p-chloriphenyl ethane] and its metabolite p,p'-dde (2-2-bis(4/chlorophenyl)-1-1-dichloroethyl) on the bovine oxytocin and the thymidine kinase-ere promoter by estrogen receptor α in mda-mb 231 and mcf-7 breast cancer cell line. materials and methods: cells were seeded for transfections into 12- well plates at a density of 100000 cells per well and were transfected with a total of 3 &mug; of plasmid dna using calcium phosphate coprecipitation. o,p’-ddt and p,p'-dde were used for stimulation of transfected mda-mb 231 and mcf-7 breast cancer cell lines. results: the results showed o,p’-ddt has no agonistic activity in mda-mb 231 cells transfected with the oxytocin promoter construct (otwt) or the thymidine kinase-ere promoter construct (tk ere) and estrogen receptor &alpha.; while, the results obviously show that o,p’-ddt has an agonistic effect on both the oxytocin and the thymidine kinase-ere promoter in mcf-7 leading to a more than two-fold stimulation of transcription at 10-5 m. in addition, there is no agonistic effect with p,p'-dde on transfected mcf-7 cells and mda-mb 231 cell line. conclusion: in conclusion, our results revealed that o,p’-ddt has not estrogenic activity in a classical mechanism in transfected mda-mb 231 breast cancer cells while has estrogenic activity in a classical mechanism in transfected mcf-7 human breast cancer cell line.
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research in molecular medicineجلد ۳، شماره ۲، صفحات ۲۸-۳۶
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