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This study was carried out to investigate the testicular toxicity of environmental toxicant, 2-bromopropane(2-BP) recently caused occupational intoxication in Korea by light microscopy and electron microscopy. To evaluate the effect on spermatogenesis and find target germ cell 10 weeks old male Sprague-Dawley rats were treated with 5g/10m ℓ/kg/day of 2-bromopropane for 3 consecutive days orally and observed on day 1 or day 7 after treatment. 2-BP induced depletion of spermatogonia and early spermatocytes on stages I-IX or extensive degeneration of germ cells on the other stages on day 1. But extensive degeneration of germ cells without stage specificity was observed and round spermatid formed multinucleated giant cells in the lumen of seminiferous tubules on day 7. Electron microscopically Sertoli cells showed irregular shape of nucleus and cytoplasmic vauolation. And spermatocyte showed a extensive heterochromatin and cytoplasmic vacuolation. But there was no histopathological changes in the interstial cells. On the base of the results the target germ cell was spermatogonia in the early of the study but Srtoli cells also effected by high-dosed 2-BP in the late of the study.
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