奥硝唑对大鼠精子的影响及作用机制探讨

目的: 探讨奥硝唑降低大鼠精子活动力的影响因素及作用机制。　方法: 20只SD大鼠随机分为低剂量组(n=5)、高剂量组(n=8)和正常对照组(n=7)。低剂量组和高剂量组分别给予 200、400mg/kg奥硝唑灌胃,正常对照组给予0. 5%羧甲基纤维素钠灌胃,连续 20d。末次给药 24h后戊巴比妥钠麻醉,取附睾及睾丸,观察精子密度、精子活动力;检测睾丸、附睾组织匀浆中乳酸脱氢酶、α 葡糖苷酶、丙二醛、果糖的浓度变化。观察睾丸与附睾有无形态学改变。　结果: 奥硝唑 200、400mg/kg,连续灌胃给药 20d,能显著降低精子活动力(P<0. 01),对精子密度无明显影响(P>0. 05)。与正常对照组比较,高剂量组乳酸脱氢酶水平明显降低 (P<0. 01),丙二醛含量明显升高(P<0. 05)。　结论: 奥硝唑通过增加细胞脂质过氧化产物丙二醛,抑制附睾中的能量转换酶或非蛋白类物质使精子细胞受损、活动力降低,这是奥硝唑致弱精子症动物模型的作用机制之一。

Effect of Ornidazole on Sperm in Rats and Its Mechanism of Action

OBJECTIVE: To explore the reductive effect of ornidazole on sperm motility in rats and its mechanism of action. METHODS: Twenty rats were randomly divided into three groups, a low dosage group (LD group, n = 5), a high dosage group (HD group, n = 8) and a normal control group (n = 7). Ornidazole (200 mg/kg, 400 mg/kg) was given to the LD and HD groups, and 0.5% carboxymethylcellulose sodium (CMC) administered to the normal control, all for 20 consecutive days. Immediately after, sperm density, motility and the morphological changes of the testis and epidiclymis were measured, and the concentrations of lactate dehydrogenase (LDH), alpha-glycosidase, malondialdehyde (MDA) and fructose in the testis and epididymis tissues were monitored. RESULTS: Compared with the normal control, there were no obvious changes in sperm density (P > 0.05), but a significant decrease in sperm motility in the LD and HD groups (P < 0.01), and the concentration of LDH obviously declined (P < 0.01) while that of MDA distinctly increased in the HD group (P < 0.05). CONCLUSION: Spermatogenic cells could be damaged by the increase of inhibiting MDA, while sperm motility could be decreased by inhibiting energetic transferase or non-protein substance in the epididymis. This might be one of the mechanisms of ornidazole on weak sperm models in rats.