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1、·1036·浙江臨床醫(yī)學(xué)2014年7月第16卷第7期厄貝沙坦對糖尿病大鼠腎小球PPAR—轉(zhuǎn)錄活性的影響蘇波峰倪海真黃景勇★【摘要】目的觀察厄貝沙坦對糖尿病大鼠腎組織過氧化物酶體增殖物激活受體(PPAR.)轉(zhuǎn)錄活性的影響,并對相關(guān)機制進行初步探討。方法雄性SD大鼠分為3組:正常對照組、糖尿病對照組、糖尿病厄貝沙坦治療組。采用STZ腹腔注射制成糖尿病模型。各組大鼠飼養(yǎng)12周后測24h尿蛋白量,分別采用PAS染色觀察腎小球細(xì)胞外基質(zhì)(ECM)沉積,免疫組化染色檢測腎小球P.ERK蛋白的表達,RT-PCR;~rJ腎小球PPAR-和A.FABPmRNA的相對表達量,以
2、A.FABPmRNA的表達水平代表PPAR一的轉(zhuǎn)錄活性。結(jié)果與糖尿病對照組比較,厄貝沙坦治療組大鼠腎小球PPAR.mRNA水平無明顯變化,但腎小球p.ERK表達減少,腎小球PPAR.的轉(zhuǎn)錄活性明顯增強,24h尿蛋白量與腎小球ECM沉積明顯減少。結(jié)論厄貝沙坦改善糖尿病大鼠腎臟病變,增強糖尿病大鼠腎小球PPAR-的轉(zhuǎn)錄潘勝。機制可能與其減輕p.ER覯寸PPAR-轉(zhuǎn)錄活性的抑制有關(guān)?!娟P(guān)鍵詞】糖尿病腎病過氧化物酶體增殖物激活受體細(xì)胞外信號調(diào)節(jié)激酶血管緊張素受體阻斷劑【Abstract】ObjectiveToinvestigatetheeffectsofirbesa
3、rtanontranscriptionactivityofperoxisomeproliferators-activatedreceptorinthekidneyglomeruliofdiabeticratsandfurtherinvestigatethepossiblemechanisms.MethodsMaleSDratswererandomlydividedintothreegroupsasfollowed:normalcontrolgroup,diabeticgroup,Irbesartantreateddiabeticgroup.Diabeticr
4、atsmodelwereinducedbyintraperitonealinjectionofstreptozotocin.After12weeks,24一hoururinaryproteinwasquantified,ECMwasmeasuredbyPASstaining,expressionofp—ERKinglomeruliwasdetectedbyimmunohistochemistry,andmRNAexpressionsofPPAR-andA-FABPinglomeruliweresemi·quantifiedbyRT-PCRassay,mRNA
5、expressionlevelofA—FABPwasregardedastheindexofPPAR-transcriptionactivity.ResultsTreatmentwithirbesartandecreased24-hoururinaryproteinexcretionandglomerularECMdepositionindiabeticrats.AlthoughthePPAR一mRNAlevelhasnotsignificantvariancebetweendiabeticgroupandIrbesartantreatedgroup,the
6、expressionlevelofp-ERKproteindecreased,andPPAR一transcriptionactivityincreasedremarkablyinIrbesartantreatedgroup.ConclusionsTreatmentwithirbesartanamelioratesrenallesionsindiabeticratsandincreasesPPAR一transcriptionactivitypossiblybyinhibitingp-ERKexpression.【Keywords】Diabeticnephrop
7、athyPeroxisomeproliferators—activatedreceptorExtracellularsignal—regulatedkinaseAngiotensinreceptorblocker糖尿病狀態(tài)下,腎組織局部腎素一血管緊張素正常對照組(A組)、糖尿病對照組(B組),糖尿系統(tǒng)(Renin—Angiotensin—System,RAS)的激活在糖病厄貝沙坦治療組(C組),每組10只。B組和c尿病腎病的進展中起重要作用。多種動物模型研究表組大鼠禁食過夜12h,單次腹腔內(nèi)注射鏈脲佐菌素明,提高過氧化物酶體增殖物激活受體^y(peroxis
8、ome(streptozotocin,STZ)65m