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The toxicity of Enoxacin (ENX), a fluoroquinolone antibacterial agent, on the testis and epididymis was studied in rats. ENX was administered to 5 male rats orally once daily for 2 weeks at the dose level of 3000 mg/kg/day. ENX-treated rats showed a marked decrease in body weight, and two of them died on Day 10. At the end of the dosing period, absolute weights of the epididymis were decreased; in contrast, relative weights of testis were increased in the ENX-treated group. On histopathological examination, testis of ENX-treated rats exhibited the following regressive changes: degeneration of spermatids and spermatocytes, retention of Step 19 spermatids, chromatin margination in nuclei of spermatids, multinucleated giant cell formation, and/or vacuolar degeneration of Sertoli cells. Additionally, desquamated cell debris was observed in the epididymis. Degenerative spermatids and spermatocytes were strongly positive by terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling (TUNEL). From these results, it is concluded that a 2-week treatment is sufficient to detect toxic effects of ENX on reproductive organs in male rats, and that testicular toxicity induced by ENX is associated with germ cell apoptosis.

journal of toxicological sciences

COLLABORATIVE WORK TO EVALUATE TOXICITY ON MALE REPRODUCTIVE ORGANS BY REPEATED DOSE STUDIES IN RATS : 19)EFFECTS OF TWO-WEEK REPEATED DOSING OF ENOXACIN ON THE MALE REPRODUCTIVE ORGANS