A new non-hormonal antifertility drug DL 111-IT: II. Effects on testicular hyaluronidase activity in male rats.

Effects of DL-111, [3-(2-ethylphenyl)-5-(3-methoxyphenyl-1H-1,2,4-triazole] a non-hormonal antifertility agent, on testicular hyaluronidase activity, an accurate biochemical marker for testicular function, were evaluated in male rats. Treatment of 21-day-old rats with DL-111 sc for 7 or 15 days resulted in a significant fall in testicular weight and complete suppression of hyaluronidase activity. During the 30-day post-treatment the enzyme activity was restored to normal levels. Treatment of 40-day-old rats for 7 or 15 days also produced a significant decrease in testicular weight and hyaluronidase activity. Simultaneous administration of LH, PMSG or T with DL-111 to 21-day-old rats blocked the inhibitory activity of the drug as the enzyme activity was restored to untreated control levels. Administration of FSH along with DL-111 had no effect on suppressive action of the drug. These results suggest that in male rats DL-111 inhibits testicular activity by reducing LH levels, thereby reducing T levels as observed by reduced weights of testes and accessory glands of reproduction and hyaluronidase activity.