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Reduction in Rat Oocyte Fertilizability Mediated by S-(1, 2-dichlorovinyl)-l-cysteine: A Trichloroethylene Metabolite Produced by the Glutathione Conjugation Pathway


Trichloroethylene (TCE), a commonly used industrial degreasing solvent and environmental toxicant, reduces rat oocyte fertilizability by an incompletely understood mechanism. Previous evidence implicated cytochrome P450 dependent oxidation of TCE. The current study investigated a second pathway, glutathione conjugation using S-(1,2-dichlorovinyl)-l-cysteine (DCVC), a mutagenic and cytotoxic TCE-metabolite. In vitro exposure of oocytes and in vivo exposure of females to DCVC significantly reduced oocyte fertilizability (63% vs. 26%; p < 0.005 and 60% vs. 36%; p < 0.005, respectively). Reduced fertilizability of oocytes following in vivo TCE exposure may be mediated partially by the glutathione conjugation pathway.

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Portions of this paper were presented at the 39th Annual SSR Meeting, Omaha, Nebraska, July 29–August 1, 2006. Funding for KLW was provided in part by the National Institutes of Health, National Institute of Child Health and Human Development (NICHD) training grant in Fertilization and Early Development (T32 HD071131), and the University of California Toxic Substances Research and Teaching Program (UC TSR&TP) student fellowship.

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Correspondence to Trish Berger.

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Wu, K.L., Berger, T. Reduction in Rat Oocyte Fertilizability Mediated by S-(1, 2-dichlorovinyl)-l-cysteine: A Trichloroethylene Metabolite Produced by the Glutathione Conjugation Pathway. Bull Environ Contam Toxicol 81, 490–493 (2008).

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  • Trichloroethylene
  • Oocyte fertilizability
  • Ovary
  • Reproduction