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The present study was performed to establish a short-term screening test for detecting testicular toxicity of chemicals in rats and to determine whether a 2-week administration period is sufficient to detect testicular toxicity of 2-bromopropane (2-BP) as an example. Male Sprague-Dawley rats were subcutaneously administered with 1000 ㎎/㎏/day of 2-BP or its vehicle (com oil) for 2 weeks. Ten male rats each were sacrificed on days 3, 7 and 14 after the initiation of treatment. Parameters of testicular toxicity included genital organ weights, testicular sperm head counts, epididymal sperm counts, motility and morphology, and histopathologic examinations. The early histopathological changes observed in testes and epididymides included degeneration and decrease of spermatogonia in stages Ⅰ~Ⅵ, degeneration and decrease of spermatocytes and multinuclear giant cells in stages Ⅶ~Ⅹ, mature spermatid retention in stages Ⅸ~?, vacuolization of Sertoli cells, and degeneration of spermatogenic cells in epididymal ducts. On day 14 after treatment, a significant decrease in the weights of testes and seminal vesicles was found. Atrophy of seminiferous tubules, exfoliation of spermatogenic cells, degeneration and decrease of spermatogonia, degeneration and decrease of spermatocytes, multinuclear giant cells, mature spermatid retention, vacuolization of Sertoli cells, oligozoospermia, and degeneration of spermatogenic cells in epididymal ducts were also observed. In addition, a slight non-significant decrease in testicular sperm head counts, daily sperm production and epididymal sperm counts was found. The results showed that 2 weeks of treatment is sufficient to detect the adverse effects of 2-BP on male reproductive organs. It is considered that the short-term testicular toxicity study established in this study can be a useful tool for detecting the testicular toxic potential of new drug candidates in rats.

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UCI(KEPA) : I410-ECN-0101-2009-510-016364721