Objective: The effects of dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, di-n-butyl phthalate, benzylbutyl phthalate, di-2-ethylhexyl phthalate were investigated on human prostate cancer cell lines DU145 and PC3 in vitro.
Materials And Methods: Standards of dimethyl phthalate, diethyl phthalate, di-isobutyl phthalate, dibutyl phthalate, benzyl butyl phthalate, and di-ethyl hexyl phthalate were used. Alpha lipoic acid was used as antioxidant compound. DU145 and PC3 human prostate carcinoma cells were used. MTT assay were used for cytotoxicity assay.
Results: A low dose proliferative effect of phthalates in vitro was observed. With the hypothesis of the inhibition of aerobic glycolysis activity in cancer treatment, α-lipoic acid was applied to cells; where as a contrary to previous studies, no change in the cell proliferation was observed. In combination with ALA, at IC50 and lower doses, an increase of the cytotoxic effect was found for DIBP, DBP and BBP; while for DMP, DEP and DEHP, a decrease was observed for DU145 cells. In PC3 cells, a decrease was observed for DMP, DEP and DBPs; while no significant difference were observed for DEHP, DIBP and BBP.
Conclussion: The present study demonstrates preliminary information regarding the low dose proliferative effects of phthalates in prostate cancer in vitro (Tab. 2, Fig. 2, Ref. 65).
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