抑制糖原合成酶激酶-3β对糖尿病肾病大鼠的作用分析
发布时间:2018-04-27 02:20
本文选题:GSK3β + Akt1 ; 参考:《吉林大学》2014年硕士论文
【摘要】:研究背景: 糖尿病肾病(Diabetic Nephropathy,DN)是导致终末期肾病(end-stage renal disease,ESRD)的主要病因。DN肾脏病理变化主要表现为肾小球基底膜增厚及细胞外基质积聚,DN早期肾小球病变以肾小球滤过率增加为主要表现,病理上可见肾小球体积增大、肾小球基底膜增厚及细胞外基质增多。随着病情的持续进展出现肾功能逐步下降。近期研究表明,2型糖尿病中肝脏等组织中的GSK3β活性明显升高而削弱了胰岛素信号通路的传导,使糖的利用、糖原合成等过程受抑制而出现胰岛素抵抗现象。因此推断GSK3β抑制剂可用于缓解胰岛素抵抗,治疗2型糖尿病。目前对应用GSK3β抑制剂治疗DN已有相关报道,但对GSK3β其作为胰岛素信号通路中重要的一员,其在肾小球病变的具体作用机制并不明确,因此,探究GSK3β在DN中的作用及作用机制对DN的发病机制及发现治疗新靶点有重要意义。 目的: 本实验构建模型后观察DN大鼠的蛋白尿、血糖、血肌酐、肾脏病理、肾组织GSK3β、Akt1的mRNA水平表达及GSK3β、p-GSK3β蛋白水平的表达,从而明确GSK3β抑制剂对DN的作用及其作用机制。 方法: 将雄性Wistar大鼠分为四组:正常组(NC组,n=10),单纯抑制剂组(NY组,n=10),糖尿病肾病组(DN组,n=10),糖尿病肾病后应用抑制剂组(DY组,n=10)。本研究糖尿病组及糖尿病应用抑制剂组全部大鼠应用高脂饮食喂养,再联合小剂量腹腔注射STZ,构建糖尿病肾病大鼠模型。糖尿病肾病大鼠模型构建成功后,NY组、DY组大鼠隔日腹腔注射GSK3β抑制剂(氯化锂)进行药物干预治疗。观察各组大鼠一般状态、体重、血糖、尿蛋白、血肌酐等指标,观察肾组织病理改变。应用Real-time PCR方法检测肾小球糖原合成酶激酶3B(GSK3β)、丝/苏氨酸激酶(Akt1)的mRNA表达,应用Western印迹方法检测肾组织GSK3β及p-GSK3β蛋白水平的表达情况。 结果: 成功构建了糖尿病肾病大鼠模型。与NC组比较,DN组尿蛋白明显增加,肾脏病理表现为肾小球体积增大、系膜基质增多、弥漫性基底膜增厚等改变。糖尿病肾病大鼠应用GSK3β抑制剂氯化锂后24h尿蛋白定量明显下降,PAS染色观察显示DY组较DN组肾脏病理变化明显减轻,系膜细胞增生及基质增多趋于好转,蛋白管型及间质炎细胞浸润减少。应用Real-time PCR方法研究显示:与NC组相比,DN组GSK3βmRNA相对表达量显著升高(P<0.05),Akt1mRNA相对表达量有所增加但无统计学意义;而经过抑制剂治疗的DY组大鼠肾脏GSK3β表达量较NC组降低(P<0.05),Akt1mRNA表达量略有所下降但无统计学意义。应用Western印迹方法研究显示:与NC组相比,DN组p-GSK3β表达水平较低,DY组p-GSK3β的表达有所增加(P<0.05),两组总GSK3β蛋白水平表达变化均不明显。 结论: 通过氯化锂抑制糖尿病肾病大鼠肾组织GSK3β发现,氯化锂可以使p-GSK3β表达量增加,而总GSK3β未发生明显变化。由此推断,氯化锂可抑制非磷酸化GSK3β表达,减少蛋白尿,使肾脏病理变化减轻,达到保护肾脏的作用。
[Abstract]:Research background:
Diabetic Nephropathy (DN) is the main cause of end-stage renal disease (ESRD). The pathological changes of renal.DN are mainly manifested in the thickening of the glomerular basement membrane and the accumulation of extracellular matrix. The main manifestation of the early glomerular lesion in DN is the increase of glomerular filtration rate, and the glomerular volume increases in pathology. The thickening of the glomerular basement membrane and the increase of the extracellular matrix. As the progression of the disease progresses, the renal function gradually decreases. Recent studies have shown that the GSK3 beta activity in the liver and other tissues in type 2 diabetes is significantly increased and weakens the transmission of insulin signaling pathway, resulting in insulin resistance in the process of sugar utilization and glycogen synthesis. Therefore, it is concluded that GSK3 beta inhibitors can be used to alleviate insulin resistance and to treat type 2 diabetes. Currently, there are some reports on the application of GSK3 beta inhibitor for the treatment of DN, but the specific mechanism of GSK3 beta as an important member of the insulin signaling pathway is not clear. Therefore, the role of GSK3 beta in DN is explored and the role of GSK3 beta in DN is explored. The mechanism is important for the pathogenesis of DN and finding new targets for treatment.
Objective:
After constructing the model, the proteinuria, blood sugar, blood creatinine, renal pathology, the expression of GSK3 beta, Akt1 mRNA and the expression of GSK3 beta and p-GSK3 beta protein were observed in the DN rats, and the effect and mechanism of GSK3 beta inhibitor on DN were clearly defined.
Method锛,
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