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抑制糖原合成酶激酶-3β對(duì)糖尿病腎病大鼠的作用分析

發(fā)布時(shí)間:2018-04-27 02:20

  本文選題:GSK3β + Akt1。 參考:《吉林大學(xué)》2014年碩士論文


【摘要】:研究背景: 糖尿病腎病(Diabetic Nephropathy,DN)是導(dǎo)致終末期腎病(end-stage renal disease,ESRD)的主要病因。DN腎臟病理變化主要表現(xiàn)為腎小球基底膜增厚及細(xì)胞外基質(zhì)積聚,DN早期腎小球病變以腎小球?yàn)V過(guò)率增加為主要表現(xiàn),病理上可見(jiàn)腎小球體積增大、腎小球基底膜增厚及細(xì)胞外基質(zhì)增多。隨著病情的持續(xù)進(jìn)展出現(xiàn)腎功能逐步下降。近期研究表明,2型糖尿病中肝臟等組織中的GSK3β活性明顯升高而削弱了胰島素信號(hào)通路的傳導(dǎo),使糖的利用、糖原合成等過(guò)程受抑制而出現(xiàn)胰島素抵抗現(xiàn)象。因此推斷GSK3β抑制劑可用于緩解胰島素抵抗,治療2型糖尿病。目前對(duì)應(yīng)用GSK3β抑制劑治療DN已有相關(guān)報(bào)道,但對(duì)GSK3β其作為胰島素信號(hào)通路中重要的一員,其在腎小球病變的具體作用機(jī)制并不明確,因此,探究GSK3β在DN中的作用及作用機(jī)制對(duì)DN的發(fā)病機(jī)制及發(fā)現(xiàn)治療新靶點(diǎn)有重要意義。 目的: 本實(shí)驗(yàn)構(gòu)建模型后觀察DN大鼠的蛋白尿、血糖、血肌酐、腎臟病理、腎組織GSK3β、Akt1的mRNA水平表達(dá)及GSK3β、p-GSK3β蛋白水平的表達(dá),從而明確GSK3β抑制劑對(duì)DN的作用及其作用機(jī)制。 方法: 將雄性Wistar大鼠分為四組:正常組(NC組,n=10),單純抑制劑組(NY組,n=10),糖尿病腎病組(DN組,n=10),糖尿病腎病后應(yīng)用抑制劑組(DY組,n=10)。本研究糖尿病組及糖尿病應(yīng)用抑制劑組全部大鼠應(yīng)用高脂飲食喂養(yǎng),再聯(lián)合小劑量腹腔注射STZ,構(gòu)建糖尿病腎病大鼠模型。糖尿病腎病大鼠模型構(gòu)建成功后,NY組、DY組大鼠隔日腹腔注射GSK3β抑制劑(氯化鋰)進(jìn)行藥物干預(yù)治療。觀察各組大鼠一般狀態(tài)、體重、血糖、尿蛋白、血肌酐等指標(biāo),觀察腎組織病理改變。應(yīng)用Real-time PCR方法檢測(cè)腎小球糖原合成酶激酶3B(GSK3β)、絲/蘇氨酸激酶(Akt1)的mRNA表達(dá),應(yīng)用Western印跡方法檢測(cè)腎組織GSK3β及p-GSK3β蛋白水平的表達(dá)情況。 結(jié)果: 成功構(gòu)建了糖尿病腎病大鼠模型。與NC組比較,DN組尿蛋白明顯增加,腎臟病理表現(xiàn)為腎小球體積增大、系膜基質(zhì)增多、彌漫性基底膜增厚等改變。糖尿病腎病大鼠應(yīng)用GSK3β抑制劑氯化鋰后24h尿蛋白定量明顯下降,PAS染色觀察顯示DY組較DN組腎臟病理變化明顯減輕,系膜細(xì)胞增生及基質(zhì)增多趨于好轉(zhuǎn),蛋白管型及間質(zhì)炎細(xì)胞浸潤(rùn)減少。應(yīng)用Real-time PCR方法研究顯示:與NC組相比,DN組GSK3βmRNA相對(duì)表達(dá)量顯著升高(P<0.05),Akt1mRNA相對(duì)表達(dá)量有所增加但無(wú)統(tǒng)計(jì)學(xué)意義;而經(jīng)過(guò)抑制劑治療的DY組大鼠腎臟GSK3β表達(dá)量較NC組降低(P<0.05),Akt1mRNA表達(dá)量略有所下降但無(wú)統(tǒng)計(jì)學(xué)意義。應(yīng)用Western印跡方法研究顯示:與NC組相比,DN組p-GSK3β表達(dá)水平較低,DY組p-GSK3β的表達(dá)有所增加(P<0.05),兩組總GSK3β蛋白水平表達(dá)變化均不明顯。 結(jié)論: 通過(guò)氯化鋰抑制糖尿病腎病大鼠腎組織GSK3β發(fā)現(xiàn),氯化鋰可以使p-GSK3β表達(dá)量增加,而總GSK3β未發(fā)生明顯變化。由此推斷,氯化鋰可抑制非磷酸化GSK3β表達(dá),減少蛋白尿,使腎臟病理變化減輕,達(dá)到保護(hù)腎臟的作用。
[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錛,

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