中文摘要：

目的 探索三甲基氯化锡（trimethyltin chloride,TMT）对亚慢性染毒大鼠肾氢钾ATP酶活力、蛋白和基因表达水平的影响.方法 取6周龄雌性SD大鼠55只,随机分成对照、低剂量、中剂量、高剂量和超高剂量组,共5组,每组11只,分别按0、8.20、32.81、131.25、262.50μg·kg-1·d-1的TMT剂量经饮水亚慢性染毒,14周后测定血钾水平,取大鼠肾脏,用定磷法测量氢钾ATP活力,用免疫印迹法测定肾氢钾ATP酶蛋白表达水平,用实时定量-聚合酶链反应法测定肾氢钾ATP酶的mRNA表达水平.结果 与对照组[（6.9±0.3）mmol/L]比较,超高剂量组血钾水平[（5.6±0.4）mmol/L]明显降低,差异有统计学意义（P＜.01）.低剂量和超高剂量组氢钾ATP酶活力分别为（4.50±1.45）、（435±-0.72）μmolPi·mgprot-1·h-1,明显低于对照组[（6.55±0.77）μmolPi·mgprot-1·h-1],差异有统计学意义（P＜0.05）.与对照组比较,超高剂量组氢钾ATP酶蛋白和mRNA表达水平差异均无统计学意义（P＞0.05）.结论 TMT亚慢性接触可抑制氢钾ATP酶的活力,但不抑制该酶的蛋白和基冈表达.

英文摘要：

Objective To study the activity、protein and gene expression of renal HK-ATPase （HKA） in rats subchronicly exposed to trimethyltin chloride （TMT）. Methods In subchronic toxic test （14-week）, 55 female SD rats （age, 6 weeks） were divided randomly into 5 groups： control, low, medium, high and super high dosage, respectively, which drank water with TMT of 0, 8.20, 32.81, 131.25 and 262.50 μg·kg-1 ·d-1 for 14 weeks.Then serum K＋ levels were measured; the activities of H K-ATPase （HKA） in kidneys were detected by the method of determinenate phosphorus content;Western Blot assay and real-time PCR were used to exam the protein and mRNA expression levels of HKA in kidneys, respectively. Results The serum K ＋ level in super-high dosage group was （5.6±0.4） mmol/L, which was significantly lower than that [（6.9±0.3） mmol/L] in control group （P＜0.01）.The HKA enzymatic activity of kidneys in low and super high dosage groups was 4.50±1.45 and 4.55±0.72 μmolPi·mg prot-1h-1, respectively, which were significantly lower than that （6.55±0.77 μmol Pi ·mg prot-1h-1） in control group （P＜0.05）. Conclusion When rats were exposed subchronicly to TMT, the renal HKA activity could reduce, but the expression levels of HKA protein and mRNA did not decrease.