摘要
目的探讨组织蛋白酶L(CTSL)介导三氯乙烯(TCE)致敏小鼠肾脏损伤的分子机制。方法41只雌性BALB/c小鼠随机分为空白组(5只)和溶剂组(5只),TCE处理组(15只)和TCE+CTSLi处理组(16只),建立TCE经皮致敏小鼠模型,对TCE+CTSLi处理组小鼠腹腔注射CTSL抑制剂(10 mg/kg)进行预处理,根据小鼠皮肤致敏评分评估为阳性组和阴性组。通过电镜和HE染色观察小鼠肾脏病理情况,血清尿素氮(BUN)评估小鼠肾功能水平,免疫荧光检测CTSL的表达情况,TUNEL染色评估小鼠肾脏细胞凋亡情况,免疫印迹法检测肾脏蛋白激酶C(PKC)信号分子的活化情况。结果TCE处理组和TCE+CTSLi处理组的致敏率分别为53.3%(8/15)和50.0%(8/16),致敏率差异无统计学差异(P>0.05)。病理学结果表明TCE致敏阳性小鼠出现肾小管细胞水肿、空泡变性,肾小球基底膜增厚,足细胞足突融合,线粒体空泡样变性等表现。肾功能结果表明TCE致敏阳性小鼠血清BUN水平较其他组升高。免疫荧光结果表明CTSL在TCE致敏阳性小鼠肾脏表达水平升高(P<0.05,F=82.438),肾脏结构细胞凋亡水平同样高于其他各组(P<0.05)。免疫印迹结果表明TCE致敏阳性小鼠肾脏中PKC蛋白磷酸化水平升高,而使用CTSLi预处理后,TCE+CTSLi致敏阳性组中的表达出现下调(P<0.05,F=35.686),肾脏细胞凋亡水平降低,肾脏损害得以改善。结论CTSL可能通过激活PKC信号介导肾脏细胞凋亡,加重TCE致敏小鼠肾脏损害。
Objective To investigate the mechanism of cathepsin L(CTSL)-mediated kidney injury in trichloroethene(TCE)-sensitized mice. Methods 41 BALB/C mice were randomly divided into blank group(n=5), solvent group(n=5), TCE treatment group(n=15) and TCE+CTSLi treatment group(n=16). TCE percutaneous sensitization mouse model was established, and the mice were evaluated as positive group and negative group according to skin sensitization score. The renal pathology of mice was observed by electron microscopy and HE staining, the renal function level of mice was assessed by serum urea nitrogen(BUN). The expression of CTSL was detected by immunofluorescence, the apoptosis of renal cells was assessed by TUNEL staining, and the activation of renal protein kinase C(PKC) signal molecule was detected by Western blot. Results The sensitization rates of TCE treatment group and TCE+CTSLi treatment group were 53.3%(8/15) and 50.0%(8/16), respectively, and there was no statistical difference in sensitization rates(P>0.05). Pathological results showed that TCE sensitized-mice showed edema and vacuolar degeneration of renal tubular cells, thickening of glomerular basement membrane, fusion of podocytes and mitochondria vacuolar degeneration. The results of renal function showed that the serum BUN level of TCE sensitized mice was higher than that of other groups. Immunofluorescence results showed that the expression level of CTSL in the kidney of TCE-sensitized positive mice increased(P<0.05, F=82.438), and the apoptosis level of renal structure cells was also higher than that of other groups(P<0.05). Western blot showed that the phosphorylation of PKC protein in the kidney of TCE-sensitized mice increased, while the expression of PKC protein in TCE+CTSLi sensitized mice was down-regulated after CTSLi pretreatment(P< 0.05, F=35.686), the level of renal cell apoptosis decreased, and renal damage was improved. Conclusion CTSL might aggravate renal damage via activation of PKC signaling in TCE-sensitized mouse.
作者
王燚灿
洪依婷
黄猛
张家祥
王峰
彭家乐
朱启星
Wang Yican;Hong Yiting;Huang Meng;Zhang Jiaxiang;Wang Feng;Peng Jiale;Zhu Qixing(Dept of Occupational Hygiene and Environmental Hygiene,School of Public Health,Anhui Medical University,Hefei 230032;Dept of Dermatology,The Second Affiliated Hospital of Anhui Medical University,Hefei 230601;Institute of Dermatology,the First Affiliated Hospital of Anhui Medical University,Hefei 230022)
出处
《安徽医科大学学报》
CAS
北大核心
2022年第7期1116-1121,共6页
Acta Universitatis Medicinalis Anhui
基金
国家自然科学基金(编号:81874259)。
关键词
三氯乙烯
职业性三氯乙烯药疹样皮炎
组织蛋白酶L
蛋白激酶C
肾脏损伤
trichloroethylene
occupational medicamentosa-like dermatitis due to trichloroethylene
cathepsin L
protein kinase C
kidney damage
