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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Neonatal exposures to technical methoxychlor alters ovaries in adult mice.

Technical grade methoxychlor (MXC) is an estrogenic pesticide currently used for pest control in the US. To determine the long-term effects of technical MXC on ovaries and estrous cycles, neonatal mice received 14 daily intraperitoneal injections of sesame oil only, 10.0 micrograms estradiol-17 beta, or 0.05 mg, 0.1 mg, 0.5 mg, or 1.0 mg of technical MXC. At 3, 6, and 12 months, vaginal smears were examined for 12 d and ovaries collected. All technical MXC doses and estradiol increased the duration of vaginal cornification but only estradiol, 0.5, or 1.0 mg technical MXC induced ovarian atrophy, relative ovarian weight loss, and depletion of corpora lutea. Technical MXC doses of 0.05 or 0.1 mg produced the opposite effects; the ovaries remained heavy, large, and filled with corpora lutea. On the other hand, follicular cysts were recorded in all groups, except the 1.0 mg MXC group. These augmentary and inhibitory effects of MXC at low and high doses mimic the estrogen effects at low and high doses, and were probably due to the altered hypothalamic-hypophyseal function.[1]


  1. Neonatal exposures to technical methoxychlor alters ovaries in adult mice. Eroschenko, V.P., Abuel-Atta, A.A., Grober, M.S. Reprod. Toxicol. (1995) [Pubmed]
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