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7,12-Dimethylbenz(a)anthracene (DMBA) is a polycyclic aromatic hydrocarbon and a component of cigarette smoke that has been identified as a murine reproductive toxicant. The morphometric parameters of total ovarian volume, individual corpus luteum volumes, and total corpora lutea volume were measured in C57BL/6N mice treated with DMBA. Each group received single intraperitoneal injections of 0, 0.1, 1.0, or 10 mg/kg and were sacrificed at 1, 2, 3, or 4 weeks after treatment. DMBA produced a dose-dependent decrease in ovarian volume and number of corpora lutea in each ovary. The observed reduction in total corpora lutea volume did not fully account for the loss in total ovarian volume. This is consistent with previous descriptions of a toxic effect on all ovarian components including growing and resting follicles. Growing follicles that escaped the toxic effects of DMBA and achieved ovulation resulted in a corpus luteum that appeared histologically normal. Morphometric analysis of this animal model further defines the dynamic changes in the mouse ovary in response to DMBA.
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