组织蛋白酶G在1型糖尿病小鼠CD4^+T淋巴细胞活化过程中的作用

目的验证调节组织蛋白酶G(CatG)对1型糖尿病(T1DM)NOD小鼠CD4^+T细胞活化水平的影响,并探讨特异性阻断CatG对T1DM的防治作用。方法选取6周龄雌性NOD小鼠84只,体重16-18 g,采用随机数字表法将其中36只分为3组:血糖正常组(正常组)、糖尿病前期组和糖尿病组(每组12只),检测各组CatG的基因表达与CD4^+T细胞活化状态。另外48只小鼠进行T1DM造模,糖尿病前期组给予CatG小干扰RNA(CatG siRNA)干预(n=12),糖尿病组给予CatG抑制剂(0.1 mg腹腔注射,隔日1次,n=12)。设立相应模型对照组(各12只),干预8周后处死取材。观察Cat...

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Bibliographic Details
Published in中华糖尿病杂志 Vol. 10; no. 2; pp. 144 - 149
Main Author 邹芳;赖晓阳;李经;蔡霞;雷水红
Format Journal Article
LanguageChinese
Published 2018
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Summary:目的验证调节组织蛋白酶G(CatG)对1型糖尿病(T1DM)NOD小鼠CD4^+T细胞活化水平的影响,并探讨特异性阻断CatG对T1DM的防治作用。方法选取6周龄雌性NOD小鼠84只,体重16-18 g,采用随机数字表法将其中36只分为3组:血糖正常组(正常组)、糖尿病前期组和糖尿病组(每组12只),检测各组CatG的基因表达与CD4^+T细胞活化状态。另外48只小鼠进行T1DM造模,糖尿病前期组给予CatG小干扰RNA(CatG siRNA)干预(n=12),糖尿病组给予CatG抑制剂(0.1 mg腹腔注射,隔日1次,n=12)。设立相应模型对照组(各12只),干预8周后处死取材。观察CatG抑制剂治疗糖尿病小鼠对CD4^+T细胞活化、胰岛功能、胰岛炎症的影响;观察早期应用CatG siRNA对NOD小鼠CD4^+T细胞活化状态及糖尿病进程的影响。3组资料比较采用单因素方差分析,2组资料比较采用独立样本t检验。结果(1)血糖正常组、糖尿病前期组和糖尿病组小鼠CatG基因表达量分别为0.42±0.21、0.60±0.33、0.94±0.45,差异有统计学意义(F=12.89,P〈0.05),正常组明显低于其他2组;与正常组相比,糖尿病前期组和糖尿病组小鼠脾脏和外周血CD4^+T细胞逐渐活化,表现为辅助性T细胞(Th)1比例明显升高,而Th2细胞和调节性T(Treg)细胞显著下降(F=11.85-21.36,均P〈0.01)。(2)与对照组相比,特异性CatG抑制剂组NOD小鼠血糖水平明显降低(t=11.26-12.45,均P〈0.01);胰岛素分泌水平升高(t=11.89-13.78,均P〈0.01);外周血和脾脏CD4^+T细胞的活化水平减轻,差异具有统计学意义(均P〈0.05)。(3)与对照组相比,早期应用CatG siRNA后Th1细胞比例下降[外周血:(5.1±1.4)%比(2.4±0.3)%,脾脏:(10.6±2.0)%比(6.3±1.5)%,t=20.78、27.96,均P〈0.05],Th2和Treg细胞比例明显升高(t=20.59-30.25,均P〈0.05),小鼠血糖降至正常或处于糖尿病前期水平,胰岛素水平显著升高(t=31.69-33.98,均P〈0.01)。结论CatG是T1DM发病中CD4^+T细胞活化过程中的主要效应蛋白酶。特异性阻断CatG可能通过抑制CD4^+T细胞的活化来保护胰岛β
Bibliography:Zou Fang, Lai Xiaoyang, Li Jing, Cai Xia, Lei Shuihong.( Department of Endocrinology, the Second Affiliated Hospital of Nanchang University, Nanchang 330006, China)
11-5791/R
Objective To identify whether regulation of Cathepsin G (CatG) expression can influence CD4^+T lymphocytes (T cells) activation in non-obese diabetic (NOD) mice, and to demonstrate the role of CatG inhibition in prevention and treatment for type 1 diabetes mellitus (T1DM).Methods A total of 36 female NOD mice (6 weeks old) were randomly divided into 3 groups according to the duration and blood glucose: normal control group, pre-diabetes (pre-DM) group, and diabetes (DM) group. CatG gene expression and CD4^+T cells activation were examined in these three groups of NOD mice (12 mice in each group). After modelling, CatG small interfering RNA (siRNA) was administrated to treat the other pre-diabetic NOD mice, and CatG inhibitor was administrated to treat diabetic NOD mice (12 mice in each intervention group) . Also control groups (12 mice in
ISSN:1674-5809