CIP4在肾间质纤维化中的表达及作用

Objective To observe the expression and localization of CIP4 (Cdc42 interacting protein-4) in the renal fibrosis and the effect of CIP4 on the expression of E-cadherin,vimentin and β-catenin tyrosine phosphorylation. Methods In vitro, the human tubular epithelial cells (HK-2 cell line) were cultured with 10 μg / L TGF-β1 for 72 h. The protein expressions of CIP4, E-cadherin, vimentin and β-catenin tyrosine phosphorylation were measured by Western blotting; the expression of CIP4 mRNA was detected by RT-PCR. The intracellular distribution of CIP4 was observe by confocal microscope. In vivo, Masson staining was used to evaluate the level of renal fibrosis; the expression and distribution of CIP4 in renal tissue were detected by immunohistochemistry. HK-2 cells were transfected with pcDNA3. 1-CIP via lipofectamine 2000. The expressions of E-cadherin, vimentin and β-catenin tyrosine phosphorylation level in the transfected cells were detected by Western blotting. Results The expressions of CIP4 mRNA and protein were up-regulated in renal tubular EMT cells. Most of CIP4 protein localized in cell membrane, and some was in cytoplasm. After stimulation by TGF-β1, the expression of CIP4 protein both in cytoplasm and nucleus was greatly increased (P ＜0.05),especially in cytoplasm. In vivo, CIP4 was expressed in renal tubular epithelia, but little expressed in glomeruli. In renal from 5/6 nephrectomized rats, CIP4 expression was significantly increased. In the CIP4 transfectants, the expression of CIP4, vimentin and β-catenin tyrosine phosphorylation level were up-regulated (P ＜0.05), but E-cadherin expression was suppressed (P ＜0.05).Conclusion The overexpression of CIP4 is likely to take part in the epithelial-to-mesenchymal transition process, thereby promoting the renal fibrosis.     

CIP4在肾间质纤维化中的表达及作用

Objective To observe the expression and localization of CIP4 (Cdc42 interacting protein-4) in the renal fibrosis and the effect of CIP4 on the expression of E-cadherin,vimentin and β-catenin tyrosine phosphorylation. Methods In vitro, the human tubular epithelial cells (HK-2 cell line) were cultured with 10 μg / L TGF-β1 for 72 h. The protein expressions of CIP4, E-cadherin, vimentin and β-catenin tyrosine phosphorylation were measured by Western blotting; the expression of CIP4 mRNA was detected by RT-PCR. The intracellular distribution of CIP4 was observe by confocal microscope. In vivo, Masson staining was used to evaluate the level of renal fibrosis; the expression and distribution of CIP4 in renal tissue were detected by immunohistochemistry. HK-2 cells were transfected with pcDNA3. 1-CIP via lipofectamine 2000. The expressions of E-cadherin, vimentin and β-catenin tyrosine phosphorylation level in the transfected cells were detected by Western blotting. Results The expressions of CIP4 mRNA and protein were up-regulated in renal tubular EMT cells. Most of CIP4 protein localized in cell membrane, and some was in cytoplasm. After stimulation by TGF-β1, the expression of CIP4 protein both in cytoplasm and nucleus was greatly increased (P ＜0.05),especially in cytoplasm. In vivo, CIP4 was expressed in renal tubular epithelia, but little expressed in glomeruli. In renal from 5/6 nephrectomized rats, CIP4 expression was significantly increased. In the CIP4 transfectants, the expression of CIP4, vimentin and β-catenin tyrosine phosphorylation level were up-regulated (P ＜0.05), but E-cadherin expression was suppressed (P ＜0.05).Conclusion The overexpression of CIP4 is likely to take part in the epithelial-to-mesenchymal transition process, thereby promoting the renal fibrosis.     

DJ-1癌基因在肾间质纤维化中表达的实验研究

目的 观察DJ-1癌基因在肾纤维化过程中表达水平、细胞内定位及高表达 DJ-1基因对人肾小管上皮细胞E钙黏蛋白（E-cadherin）、波形蛋白（vimentin）蛋白表达和β连环素（β-catenin）酪氨酸磷酸化水平的影响。 方法 体外实验以人肾小管上皮细胞为研究对象,10 μg/L TGF-β1刺激72 h诱导人肾小管上皮细胞转分化;Western印迹法检测正常组和TGF-β1干预组细胞内E-cadherin、vimentin和DJ-1蛋白表达;RT-PCR法检测两组细胞内DJ-1 mRNA表达水平;应用激光共聚焦显微镜观察DJ-1在细胞内的定位。体内实验以SD大鼠为研究对象,5/6肾切除法制作慢性肾纤维化模型;常规检测BUN和Scr水平;Masson染色检测肾组织纤维化水平;免疫组化法检测肾组织内DJ-1蛋白的表达和分布。脂质体法介导含野生型DJ-1基因的重组真核表达质粒pEGFP-N1-DJ-1或空载体转染人肾小管上皮细胞,倒置荧光显微镜和Western 印迹法鉴定转染效率后,Western 印迹法检测正常组、pEGFP-N1-DJ-1转染组和空载体转染组细胞内E-cadherin、vimentin蛋白的表达及各组β-catenin酪氨酸磷酸化水平。 结果 正常组细胞表达E-cadherin和DJ-1,几乎不表达vimentin;TGF-β1干预组细胞表达vimentin,表达较少E-cadherin,DJ-1 mRNA和蛋白表达均较正常组细胞显著增多（P < 0.05）。DJ-1在正常细胞内大多分布在细胞质,部分分布在细胞核;在转分化细胞内胞质和胞核内表达均有增加,且胞核内增加更显著。假手术组大鼠肾功能正常,肾组织内未见纤维组织,DJ-1主要表达于肾小管,肾小球内几乎没有表达。模型组大鼠肾功能不全,肾组织内可见明显纤维化结构,肾小管内DJ-1表达明显增加。pEGFP-N1-DJ-1转染组较正常组和空载体转染组细胞内DJ-1和vimentin蛋白表达明显增加且β-catenin酪氨酸磷酸化水平升高, 而 E-cadherin蛋白表达减少。 结论 DJ-1基因高表达可能促进了肾间质纤维化。     

肾脏间质细胞,小管细胞在间质纤维化中的作用

肾小管－间质纤维化与肾功能受损密切相关，其程度预示着慢性肾脏病患者的预后，除微小病变型肾病外，所有原／继发性肾小球疾病和小管一间质性疾病均有单个核细胞（淋巴细胞／单核巨噬细胞、成纤维细胞）增多。这些病理性增多的细胞与肾小管上皮细胞或合成和分泌细胞外基质直接参与间质纤维化形成；或通过释放在子促进成纤维细胞的增殖和细胞外基质的沉积，从而间接参与间质纤维化过程；或兼有上述两种作用。     

Erbin在肾间质纤维化中的表达和作用

目的 探讨Erbin在肾脏间质纤维化中表达量的变化及上调Erbin对转化生长因子β1（TGF-β1）诱导大鼠近端肾小管上皮细胞（NRK52E）转分化的影响。 方法 体内实验采用SD大鼠5/6肾切除法建立肾纤维化动物模型,收集并检测各组血清中Scr、BUN水平;Masson染色观察肾间质纤维化程度;免疫组化及Western印迹检测Erbin的分布与表达。 体外实验采用TGF-β1（10 μg/L）刺激NRK52E细胞72 h建立上皮细胞-间充质转分化（EMT）细胞模型;免疫荧光及Western印迹法检测E钙黏蛋白（E-cadherin）和α平滑肌肌动蛋白（α-SMA）的表达变化;RT-PCR及Western 印迹法检测Erbin的表达变化。用脂质体2000将质粒 Prk5-myc-Erbin瞬时转染至NRK52E细胞,Western印迹法观察上调Erbin表达后对上述各种指标的影响。 结果 （1）假手术组大鼠肾功能正常[Scr（33.96±7.28） μmol/L、BUN（8.11±2.55） mmol/L],Masson染色未见肾间质纤维化,Erbin在肾小管表达较少;模型组大鼠Scr [（140.52±61.11） μmol/L]、BUN[（34.23±7.66） mmol/L] 均显著高于假手术组（均P < 0.05）,肾间质可见明显纤维化,Erbin 在肾小管表达也明显增加,是假手术组的2.9倍（P < 0.01）。（2）正常NRK52E 细胞表达E-cadherin,少量表达Erbin和α-SMA。TGF-β1刺激后,NRK52E细胞E-cadherin表达显著减少,Erbin和α-SMA则表达增加（均P < 0.05）;而转染质粒Prk5-myc-Erbin可逆转TGF-β1诱导的NRK52E细胞E-cadherin表达下调,并可抑制α-SMA表达上调（均P < 0.05）。 结论 Erbin在肾间质纤维化中表达增加,上调Erbin表达可抑制TGF-β1诱导NRK52E发生EMT, 提示Erbin在肾脏纤维化中可发挥保护作用。     

Erbin在肾间质纤维化中的表达和作用

Objective To investigate the expression of Erbin in renal interstitial fibrosis (RIF) and the effect of over-expression of Erbin on transforming growth factor β1 (TGF-(β1)-induced epithelial-mesenchymal transition (EMT) in NRK52E cells. Methods In vivo, the model of renal fibrosis was induced by 5/6 subtotal nephrectomy in rat. Scr and BUN was detected and Masson staining was used to evaluate the level of renal tissue fibrosis. The location and expression of Erbin in renal tissue were detected by immunohistochemistry and Western blotting. In vitro, after NRK52E cells were treated by TGF-β1 (10 μg/L) for 72 h, immunofluorescence and Western blotting were used to obverse the expression and distribution of E-cadherin and α-SMA. The expression of Erbin mRNA and protein were detected by RT-PCR and Western blotting respectively. NRK52E cells were transiently transfected with Prk5-myc-Erbin plasmid via lipofectamine 2000, then the expressions of Erbin, E-cadherin and α-SMA were detected by Western blotting. Results (l)Compared to sham group with Scr (33.96±7.28) μmol/L and BUN (8.11±2.55) mmol/L, rats in 5/6 nephrectomy model with Scr (140.52±61.11) μmol/L and BUN (34.23±7.66) mmol/L revealed renal dysfunction. Masson staining indicated kidney interstitial fibrosis, and the expression of Erbin was significantly increased in renal tissue(2.9 folds), especially in tubular epithelia. (2)In vitro, the expressions of Erbin and α-SMA were markedly increased (2.3 folds and 2.1 folds, P<0.05, respectively) and the expression of E-cadherin was dramatically decreased in NRK52E cells stimulated by TGF-β1, which were consistent with immunofluorescence results. TGF-β1-induced E-cadherin suppression and a-SMA induction could be efficiently blocked by over-expression of Erbin (all P <0.05). Conclusions Erbin is up-regulated in renal interstitial fibrosis, and over-expression of Erbin can partly inhibit renal EMT induced by TGF-β1, which indicates Erbin playing an protective role in renal fibrosis.     

Erbin在肾间质纤维化中的表达和作用

Objective To investigate the expression of Erbin in renal interstitial fibrosis (RIF) and the effect of over-expression of Erbin on transforming growth factor β1 (TGF-(β1)-induced epithelial-mesenchymal transition (EMT) in NRK52E cells. Methods In vivo, the model of renal fibrosis was induced by 5/6 subtotal nephrectomy in rat. Scr and BUN was detected and Masson staining was used to evaluate the level of renal tissue fibrosis. The location and expression of Erbin in renal tissue were detected by immunohistochemistry and Western blotting. In vitro, after NRK52E cells were treated by TGF-β1 (10 μg/L) for 72 h, immunofluorescence and Western blotting were used to obverse the expression and distribution of E-cadherin and α-SMA. The expression of Erbin mRNA and protein were detected by RT-PCR and Western blotting respectively. NRK52E cells were transiently transfected with Prk5-myc-Erbin plasmid via lipofectamine 2000, then the expressions of Erbin, E-cadherin and α-SMA were detected by Western blotting. Results (l)Compared to sham group with Scr (33.96±7.28) μmol/L and BUN (8.11±2.55) mmol/L, rats in 5/6 nephrectomy model with Scr (140.52±61.11) μmol/L and BUN (34.23±7.66) mmol/L revealed renal dysfunction. Masson staining indicated kidney interstitial fibrosis, and the expression of Erbin was significantly increased in renal tissue(2.9 folds), especially in tubular epithelia. (2)In vitro, the expressions of Erbin and α-SMA were markedly increased (2.3 folds and 2.1 folds, P<0.05, respectively) and the expression of E-cadherin was dramatically decreased in NRK52E cells stimulated by TGF-β1, which were consistent with immunofluorescence results. TGF-β1-induced E-cadherin suppression and a-SMA induction could be efficiently blocked by over-expression of Erbin (all P <0.05). Conclusions Erbin is up-regulated in renal interstitial fibrosis, and over-expression of Erbin can partly inhibit renal EMT induced by TGF-β1, which indicates Erbin playing an protective role in renal fibrosis.     

肾小管上皮细胞表型转化与肾间质纤维化

肾间质纤维化(renal interstitial fibrosis,RIF)几乎是所有各种肾脏疾病进展到终末期肾衰竭(end-stage renal distase,ESRD)的共同途径.近年来已经认识到无论是原发性肾小球疾病或是肾血管及小管间质性疾病,肾功能的损害程度均与小管间质病变的程度密切相关,而与肾小球病理严重程度并不相关.肾小管间质病变程度是反映肾功能下降严重程度和判断预后最重要的指标.肾间质纤维化在人类肾脏疾病转归中起主导作用.     

肝细胞生长因子与肾间质纤维化

肝细胞生长因子（hepatocyte growth factor,HGF）是一种对多种器官具多效性的多肽细胞因子,它不仅在肝脏再生、肝硬化、肺纤维化、肿瘤等发生中起重要作用,对于肾损伤后肾小管的修复与再生至关重要。研究表明,HGF能够阻止慢性肾衰竭的发生发展及抑制转化生长因子-β1（transforming growth factor-β1,TGF—β1）的表达。体外试验中,HGF通过抑制不同肾脏细胞中TGF-β1的表达,从而达到抑制肾小管上皮细胞一肌成纤维细胞转分化（tubular epithelial to mesenchymal transition,EMT）的目的。近期还有研究表明HGF还可通过多种不同机制阻断＆md信号转导通路以对抗TGF-β1的致纤维化作用。     

肾小管上皮细胞转分化中CIP4与β连环素的相互作用

目的 探讨在大鼠肾脏纤维化组织中CIP4(Cdc42-interacting protein 4)的表达和分布,以及在转化生长因子β1(TGF-β1)诱导的人肾小管上皮细胞(HK-2)-间质细胞转分化(EMT)模型中,CIP4与β连环素(β-catenin)之间的相互作用关系.方法 体内实验用SD大鼠5/6肾切除法建立肾纤维化模型,根据Masson染色结果观察肾脏组织纤维化程度;用免疫组织化学染色观察CIP4在模型组和假手术组的表达和分布.体外实验用HK-2细胞株作为研究对象,使用TGF-β1(10 μg/L)刺激72 h建立EMT模型.Western印迹法检测E钙黏蛋白(E-cadherin)和α平滑肌肌动蛋白(α-SMA)蛋白表达变化,同时检测CIP4和β-catenin的表达水平;免疫荧光法观察CIP4和β-catenin在两组细胞中的共定位关系;免疫共沉淀方法检测CIP4和3-catenin之间的相互作用关系;用脂质体2000将质粒pcDNA4.0-CIP4瞬时转染至HK-2细胞,Western印迹法检测高表达CIP4对上述指标的影响,以及高表达CIP4与TGF-β1刺激对β-catenin入核的影响.结果 体内实验,CIP4在假手术组和5/6肾切除组大鼠肾组织中都有表达,在纤维化的肾脏组织中表达上调,主要分布在肾小管中,且在上皮细胞侧基底膜处聚集.体外实验,与对照组相比,EMT模型组HK-2细胞CIP4和α-SMA蛋白表达明显增高,分别是对照组的1.8倍和2.5倍,同时E-cadherin表达量减少(均P＜0.05),β-catenin表达量无明显变化.免疫荧光结果显示对照组CIP4与β-catenin主要分布于细胞膜,且在细胞膜上存在部分共定位;模型组中,CIP4与β-catenin在细胞膜上分布减少,细胞核内表达增多,细胞核内存在部分共定位现象.免疫共沉淀结果表明在以上两组细胞中,CIP4和β-catenin均存在相互作用.单独转染CIP4目的基因质粒的HK-2细胞中,CIP4与α-SMA表达上调,分别为对照组的3.5倍与1.7倍,并伴有E-cadherin表达下降(均P＜0.05),与单独TGF-β1刺激相似;高表达CIP4与TGF-βl刺激均可上调β-catenin在核蛋白中的表达,分别为对照组的2.0倍和2.5倍(P＜0.05).结论 CIP4在5/6肾切除组大鼠肾脏组织中表达上调,且主要分布于肾小管上皮细胞侧基底膜处,其与β-catenin有部分共定位,且存在相互作用,提示CIP4可能通过促进β-catenin入核,参与EMT的进程.     

肾间质纤维化中DJ-1抑制抗纤维化因子PTEN的表达

目的 观察肾小管上皮细胞转分化过程中PTEN的表达和分布,并研究上调DJ-1 对 PTEN 表达和分布及 PI3K-Akt 通路活化的影响。 方法 以人肾小管上皮细胞为研究对象,10 μg/L TGF-β1 刺激72 h 诱导人肾小管上皮细胞转分化;Western印迹法检测正常组和 TGF-β1 干预组细胞内 PTEN、E-cadherin 和α-SMA 蛋白表达;RT-PCR 法检测两组细胞内 PTEN mRNA 表达水平。脂质体法介导 pEGFP-N1-DJ-1 或空载体转染人肾小管上皮细胞,倒置荧光显微镜和Western印迹鉴定转染效率后,Western印迹法检测正常组、pEGFP-N1-DJ-1 转染组和空载体转染组细胞内 PTEN 蛋白表达;RT-PCR 法检测各组细胞内 PTEN mRNA 表达。pEGFP-N1-DJ-1 转染前 1 h 用 PI3K 抑制剂 LY294002 预处理,Western印迹检测正常组、pEGFP-N1-DJ-1 转染组和空载体转染组及 LY294002 预处理1 h 后 pEGFP-N1-DJ-1 转染组的 p-Akt 和Akt蛋白的表达。激光共聚焦显微镜下观察正常组、TGF-β1 干预组和 pEGFP-N1-DJ-1 转染组细胞内 PTEN 蛋白的分布。 结果 正常组细胞表达 E-cadherin 和 PTEN,几乎不表达α-SMA;TGF-β1干预组α-SMA 表达显著高于正常组（P < 0.05）,而 E-cadherin表达显著低于正常组（P < 0.05）,PTEN mRNA 和蛋白表达均显著低于正常组（P < 0.05）。pEGFP-N1-DJ-1和空载体转染后,细胞绿色荧光表达均在 80% 以上;pEGFP-N1-DJ-1 转染组细胞内 DJ-1 表达显著高于正常组（P < 0.05）,而 PTEN mRNA 和蛋白表达均显著低于正常组（P < 0.05）;pEGFP-N1-DJ-1 转染组p-Akt 表达显著高于正常组（P < 0.05）,但经 LY294002 干预后与正常组表达基本一致。正常组细胞内PTEN 分布于细胞质和细胞核;TGF-β1 干预组细胞质内 PTEN 几乎完全消失,而细胞核PTEN 略有增加;pEGFP-N1-DJ-1 转染组细胞核表达PTEN,但细胞质几乎无 PTEN 表达,这与 TGF-β1干预组相似。 结论 肾间质纤维化中高表达 DJ-1 可抑制 PTEN 表达,并促进 PI3K-Akt 通路活化。     

甲状旁腺激素对人近曲小管上皮细胞转分化及分泌结缔组织生长因子的影响

目的 探讨甲状旁腺激素（PTH）对人近曲小管上皮细胞系HK-2细胞分泌结缔组织生长因子（CTGF）及细胞转分化的影响。 方法 应用实时定量PCR和Western印迹观察PTH诱导HK-2细胞CTGF mRNA和蛋白表达情况，从转录水平探讨PTH对CTGF基因启动子活性的调控作用。应用免疫荧光技术检测PTH作用下HK-2细胞中α平滑肌肌动蛋白 （α-SMA）的表达。 结果 HK-2细胞有基础水平的CTGF mRNA和蛋白表达，PTH刺激后其表达量显著增加。PTH最佳刺激浓度是10－10 mol/L，最佳刺激时间是72 h。10－10 mol/L PTH干预HK-2细胞12 h后，荧光素酶活性较对照组显著升高（1.888±0.078比0.989±0.030，P ＜ 0.01）；光镜下可见细胞由立方形铺路石样转变为梭形，随作用时间延长转分化现象更显著。PTH刺激HK-2细胞12 h后，免疫荧光检测可见细胞质中有α-SMA表达；PTH刺激24 h后，α-SMA表达明显增多，与CTGF mRNA和蛋白表达的时间效应一致。 结论 PTH可上调HK-2细胞CTGF表达，并具有促进HK-2细胞转分化的作用。     

与大鼠肾间质纤维化相关microRNA的初步研究

目的 观察microRNA(miRNA)在单侧输尿管梗阻(UUO)大鼠模型中的表达,筛选与肾间质纤维化(RIF)相关的miRNA.方法 将48只SD大鼠分为UUO组和假手术组(Sham组),时间点为术后3d、7d、14 d.Masson染色观察肾脏病理.茎环实时定量PCR检测48条miRNA在肾组织的表达.结果 术后第3天,UUO组可见灶状肾间质水肿和单个核细胞浸润 ;术后第7天,灶状间质纤维化 ;术后第14天,显著间质纤维化.Sham组肾脏未见明显病变.相对于Sham组,UUO组在术后3d、7d和14 d分别有25条、24条和21条miRNA的表达差异有统计学意义(均P＜ 0.05).其中有5条miRNA(miR-132、miR-192、miR-194、miR-29c和miR-203)在术后3、7和14 d一致上调或下调,且与肾小管间质病变程度相关(均P＜0.05).结论 在大鼠UUO模型的RIF过程中20多条miRNA存在差异表达,提示miRNA可能参与RIF的发生发展过程.miR-132、miR-192、miR-194、miR-29c和miR-203与大鼠RIF关系密切,值得进一步研究.     

甲状旁腺素对人肾小管上皮细胞细胞外基质合成与降解的影响

目的 研究甲状旁腺素（PTH）对人肾小管上皮细胞（HK-2）合成分泌Ⅲ型胶原、纤连蛋白以及对纤溶酶原激活物抑制物1（PAI-1）、基质金属蛋白酶1（MMP-1）、金属蛋白酶1组织抑制剂（TIMP-1）基因表达的影响,以探讨PTH在肾间质纤维化发病机制中的作用。 方法 HK-2细胞培养于含5％ FBS的DMEM-F12培养液中,加入终浓度为0、10-12、10-11、10-10、10-9、10-8 mol/L PTH的培养液刺激HK-2细胞48 h,或10-8 mol/L PTH刺激HK-2细胞不同时间（0、12、24、48、72 h）。应用半定量RT-PCR法检测细胞中Ⅲ型胶原、纤连蛋白、PAI-1、MMP-1、TIMP-1基因的表达;Western印迹法检测HK-2细胞中Ⅲ型胶原的蛋白表达;ELISA法检测细胞培养上清液中纤连蛋白的含量。 结果 PTH 呈剂量和时间依赖性促进HK-2细胞中Ⅲ型胶原、纤连蛋白、PAI-1、TIMP-1 mRNA的表达,抑制MMP-1 mRNA的表达,MMP-1/TIMP-1 比值降低。PTH呈剂量和时间依赖性增加HK-2细胞中Ⅲ型胶原的蛋白表达及细胞培养上清液中纤连蛋白的含量。 结论 PTH通过促进HK-2细胞中PAI-1、TIMP-1的基因表达,抑制MMP-1的基因表达,导致细胞外基质合成增加而降解减少。     

瘦素对人肾小管上皮细胞表型转化及纤维连接蛋白表达的影响

目的:通过观察瘦素(leptin)刺激对人肾小管上皮细胞(HK-2)表型转化和纤维连接蛋白(FN)表达的影响,探讨瘦素对HK-2细胞转分化的作用。方法:将体外培养的HK-2细胞分为对照组和不同浓度瘦素作用组。倒置显微镜下观察HK-2细胞形态学变化;实时荧光定量RT-PCR法检测HK-2细胞α-平滑肌肌动蛋白(α-smooth muscle actin,α-SMA)、E-钙黏蛋白(E-cadherin)和FN mRNA的表达水平;免疫细胞化学法检测HK-2细胞表达α-SMA的阳性细胞百分数;酶联免疫吸附法(ELISA)检测HK-2细胞培养液上清中FN的表达。结果:分别用50、100、200 ng/ml瘦素作用HK-2细胞48 h后,(1)HK-2细胞逐渐由椭圆形变成长梭形,类似肌成纤维细胞的形态;(2)RT-PCR结果表明,瘦素作用可以下调E-cadherin mRNA的表达,同时上调α-SMA、FN mRNA的表达。(3)免疫细胞化学结果表明,对照组HK-2细胞几乎不表达α-SMA,随着瘦素作用浓度的增加,α-SMA阳性的HK-2细胞百分数逐渐增多;(4)ELISA结果表明,对照组HK-2细胞有基础水平的FN分泌,各瘦素作用组上清液中FN的表达水平较对照组显著增加,且呈一定的剂量依赖关系。结论:瘦素可诱导肾小管上皮细胞转分化为肌成纤维细胞,分泌细胞外基质,从而可能参与肾间质纤维化的发生发展。