PTEN编码蛋白对TGF-β1刺激大鼠肾成纤维细胞增殖和ColⅣ与FN分泌的抑制作用

目的：观察张力蛋白同源物基因（PTEN）编码蛋白对转化生长因子-β1（TGF-β1）刺激所致大鼠肾成纤维细胞增殖和Ⅳ型胶原（ColⅣ）、纤连蛋白（FN）分泌的影响。方法：用重组PTEN腺病毒转染体外培养大鼠肾成纤维细胞,倒置荧光显微镜检测绿色荧光蛋白表达,RT-PCR检测PTEN mRNA表达。转染36h后TGF-β1体外刺激,TGF-β1刺激24h后MTT法检测细胞增殖活力,免疫细胞化学法检测PCNA表达,ELISA法检测细胞上清中ColⅣ、FN水平。结果：PTEN腺病毒转染36h后可见明显绿色荧光蛋白表达,PTEN mRNA表达明显增多（P〈0.01）。PTEN腺病毒转染后给予TGF-β1刺激组较单纯TGF-β1刺激组平均光密度值（OD）显著降低（P〈0.01）,PCNA表达显著减少（P〈0.01）,且ColⅣ、FN的分泌水平明显下降（P〈0.05）。结论：PTEN基因编码蛋白能抑制TGF-β1刺激所致大鼠肾成纤维细胞增殖、PCNA表达及ColⅣ、FN分泌,可能具有抑制残肾纤维化、延缓残肾毁损速度的作用。     

高压诱导大鼠系膜细胞细胞外基质积聚机制及阿托伐他汀的干预作用

目的探讨高压诱导大鼠系膜细胞细胞外基质(ECM)积聚的可能途径，并观察阿托伐他汀的干预作用。方法将8-15代大鼠系膜细胞置于80mm№高压下培养6、12、24、48h。并进一步分为阿托伐他汀组、TGF—β1反义寡核苷酸组、助溶剂二甲基亚砜(DMSO)对照组、错义寡核苷酸对照组及正常对照组。放射免疫法测定AngⅡ浓度。RT-PCR法测定TGF-β1、胶原纤维(Col)Ⅰ(d1)及纤溶酶原激活物抑制剂(PAI)-mRNA表达量。Western印迹法测定上述各指标蛋白表达。结果阿托伐他汀能显著降低AngⅡ水平。TGF—β1反义寡核苷酸对AngⅡ水平无显著影响。阿托伐他汀和TGF—β1反义寡核苷酸均能明显降低TGF—β1、ColⅠ(d1)及PAI-1mRNA和蛋白水平。错义寡核苷酸和二甲基亚砜对上述指标表达水平无显著影响。结论AngⅡ和TGF-β1参与高压诱导ECM的积聚过程。AngⅡ的作用由TGF-β1介导实现，即存在“压力→AngⅡ→TGF-β1→ECM积聚”作用途径。阿托伐他汀在一定程度上逆转高压诱导的ECM积聚，此作用可通过干预上述途径实现。     

转化生长因子-β1反义RNA腺病毒载体的构建

目的构建含转化生长因子β1(TGF-β1)反义RNA的重组腺病毒重组体。方法将TGF-β1的cDNA5＇端630bp片段反向插入穿梭载体pAdTraek-CMV,构建为TGF-β1反义RNA的重组体(pAdTrack-antiTGFβ1),将重组体pAdTrack-antiTGFβ1与包装质粒pAdEasy-1共转染BJ5183细菌。用选择培养基筛选同源重组的阳性克隆,同源重组的腺病毒载体转染293细胞,在荧光显微镜下观察细胞中的绿色荧光蛋白(GFP)及PCR扩增目的基因等方法鉴定重组的腺病毒。结果构建了含rGF-β1反义RNA的重组腺病毒,其滴度为2.4×10     

醛固酮通过Smad2依赖的转化生长因子-β1途径刺激大鼠系膜细胞纤连蛋白合成

目的探讨醛固酮是否能够诱导纤连蛋白(FN)的合成,及可能的信号通路是否通过其核受体由Smad2依赖的TGF-β1途径介导。方法大鼠系膜细胞体外培养。Smad2的反义质粒由Smad2MH2功能区片段与表达绿色荧光蛋白的pEGF-C1真核质粒构建而成,运用脂质体的方法转染系膜细胞,由荧光显微镜观察细胞是否转染成功。分别用醛固酮(10-7mol/L)伴或不伴安体舒通(10-9mol/L)刺激系膜细胞,48h后收集培养上清液和各组细胞蛋白。FN、TGF-β1和Smad2的表达分别用ELISA和Western印迹的方法检测。结果醛固酮可以刺激大鼠系膜细胞TGF-β1表达升高[(134.2±13.9)%比对照组100%,P<0.05],FN合成增加[(74.2+15.0)比对照组(12.6+1.8)ng/ml,P<0.01]。先用安体舒通干预3h再加用醛固酮,则TGF-β1及FN的水平无显著变化。转染了Smad2的反义质村,醛固酮对FN的合成无显著影响,培养液中FN的浓度明显低于醛固酮刺激的未转染质粒组[(36.1±19.8)比未转染质粒组(72.3+16.6)ng/ml,P<0.05]。转染Smad2反义质粒的系膜细胞,其Smad2蛋白表达明显低于基础值[(69.1±8.6)%比基础值100%,P<0.01];而空载体pEGF-C1并不影响Smad2的表达。结论醛固酮通过核受体由Smad2依赖的TGF-β1途径诱导大鼠系膜细胞FN合成。该实验结果为临床上于预慢性肾脏病进展开辟了新的     

三七总苷对氧化低密度脂蛋白诱导大鼠系膜细胞的影响

目的：探讨三七总苷（PNS）对氧化低密度脂蛋白（OX-LDL）诱导大鼠肾小球系膜细胞合成细胞外基质（ECM）、表达转化生长因子-β1（TGF-β1）的影响。方法：采用逆转录-多聚酶链反应（RT-PCR）检测纤维连接蛋白（FN）、Ⅳ型胶原（ColⅣ）及TGF-β1的mRNA表达;酶联免疫吸附试验（ELISA）检测FN、ColⅣ及TGF-β1的蛋白含量;免疫细胞化学观察核转录因子-κB（NF-κB）p65核转位。结果：OX-LDL（50μg/ml）诱导系膜细胞FN、ColⅣ及TGF-β1表达增强,NF-κB活化,p65核转位率增加;PNS（200~800μg/ml）作用一定时间后,FN、ColⅣ及TGF-β1表达降低,NF-κBp65核转位率明显低于诱导组。结论：PNS能够抑制OX-LDL诱导的系膜细胞FN、ColⅣ合成,并抑制TGF-β1表达;这种效应可能与影响NF-κB核转位有关。     

白花丹提取物对高糖诱导的肾小球系膜细胞分泌炎症因子及细胞外基质的影响

目的探讨白花丹提取物对高糖诱导的肾小球系膜细胞分泌炎症因子及细胞外基质的影响。方法体外培养大鼠肾小球系膜细胞,随机分为对照组,模型组,白花丹提取物低剂量(1 mg/L)、中剂量(2 mg/L)、高剂量(4 mg/L)组,甘露醇(24.5 mmol/L)组,收集各组细胞及细胞培养基,以酶联免疫吸附法检测各组细胞上清液中肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)、白细胞介素6(interleukin-6,IL-6)、转化生长因子β1(transforming growth factor-β1,TGF-β1)水平;检测各组细胞超氧化物歧化酶(superoxide dismutase,SOD)、丙二醛(malondialdehyde,MDA)水平;以实时荧光定量法检测各组细胞miR-155、SOCS1 mRNA水平;采用蛋白免疫印迹法检测各组细胞纤维连结蛋白(fibronectin,FN)、Ⅳ型胶原蛋白(collagen IV,Col IV)、细胞因子信号传导抑制蛋白1(cytokine signal transduction inhibitor 1,SOCS1)蛋白表达。结果与对照组相比,模型组、甘露醇组细胞上清液中TNF-α、IL-6及TGF-β1水平升高,细胞MDA、miR-155、FN及Col IV表达升高(P0.05),细胞SOD水平、SOCS1 mRNA及蛋白表达明显降低(P0.05)。与模型组相比,白花丹提取物低、中、高剂量组细胞上清液中TNF-α、IL-6及TGF-β1水平降低,细胞MDA、miR-155、FN及Col IV表达降低(P0.05),细胞SOD水平、SOCS1 mRNA及蛋白表达升高(P0.05),且各项变化均对白花丹提取物呈剂量依赖性(P0.05)。结论白花丹提取物可抑制高糖诱导的肾小球系膜细胞分泌炎症因子及细胞外基质,下调miR-155表达、上调SOCS1表达可能是其作用机制。     

PRS-CTGF-siRNA对TGF-β1诱导的人腹膜间皮细胞细胞外基质及VEGF表达的影响

目的 观察pRetro-Super(PRS)反转录病毒载体介导的表达人结缔组织生长因子(CTGF)小分子干扰RNA(siRNA)对体外培养的人腹膜间皮细胞(HPMC) 细胞外基质和血管内皮生长因子(VEGF)表达的影响。 方法 根据siRNA靶序列要求及PRS反转录病毒载体特点分别设计4 对寡核苷酸，构建表达人CTGF基因siRNA 的PRS-CTGF-siRNA1～4重组反转录病毒载体。以脂质体2000将重组反转录病毒载体转染PT67包装细胞，继而感染HPMC。采用RT-PCR法检测mRNA表达及Western印迹法检测蛋白质表达。 结果 5 μg/L外源性转化生长因子β1（TGF-β1）刺激可诱导HPMC表达CTGF、纤连蛋白（FN）、I型胶原（Col I）、层粘连蛋白（LN）和VEGF明显增高； 而PRS-CTGF-siRNA 1～4组与TGF-β1刺激组比较，HPMC细胞内CTGF、FN、Col I、LN mRNA和蛋白表达和VEGF mRNA表达明显较低（P < 0.01），各干扰组对CTGF mRNA抑制率分别为 69.3％、22.2%、27.4%和38.8%，其中以PRS-CTGF-siRNA 1组最为明显；同时PRS-CTGF-siRNA 1组相对于TGF-β1刺激组，VEGF蛋白表达也明显较低（P < 0.01）；而PRS空载体组与TGF-β1刺激组比较，差异无统计学意义（P ＞ 0.05）。 结论 PRS-CTGF-siRNA重组反转录病毒载体可明显抑制TGF-β1诱导的细胞外基质及VEGF表达的增加。     

骨形成蛋白7重组腺病毒的构建及对TGF-β1诱导的大鼠肾系膜细胞α-SMA表达的影响

目的 构建骨形成蛋白7重组腺病毒(adenovirus bone morphogenetic protein 7.Adeno-BMP-7)及观察其对转化因子-β1(TGF-β1)诱导的大鼠肾系膜细胞(MC)α-SMA表达的影响.方法 构建Adeno-BMP 7并转染(M.O.I=100)大鼠肾系膜细胞,48h后用Western印迹法检测BMP-7蛋白的表达;分空白组.TGF-β1处理组(TGF-β1刺激24h,5ng/ml),Adeno-BMP 7转染组(TGF-β1刺激24h,5ng/ml;Adeno-BMP 7转染M.O.I=100),48h后用RT-PCR方法分别检测各组α-SMA的表达.结果 Western-blot检测示转染骨形成蛋白7重组腺病毒后的大鼠肾系膜细胞可表达BMP-7蛋白;RT-PCR示Adeno-BMP 7转染组α-SMA表达较TGF-β1处理组明显降低(Adeno-BMP 7转染组α-SMA/GAPDH值0.108,TGF-β1处理组α-SMA/GAPDH值0.112,P<0.05).结论 成功构建Adeno-BMP7,其转染能降低由TGF-β1诱导的大鼠肾系膜细胞α-SMA的表达.     

甲状旁腺激素促进系膜细胞合成分泌转化生长因子β1

目的：研究甲状旁腺激素（PTH）对大鼠系膜细胞合成与分泌转化生长因子β1（TGF－β1）的影响。方法：（1）分别以10^-12,10^-11,10^-10,10^-9,10^-8mol/l的hPTH1-34刺激大鼠系膜细胞6，12，24，48h后，ELISA方法测定上清中TGF－β1的浓度；（2）分别以10^-12,10^-11,10^-10,10^-9,10^-8mol/L的hPTH1-34刺激大鼠系细胞48h,采用半定量RT－PCR方法检测细胞TGF－β1 mRNA的表达；（3）以10^-8mol/L的hPTH1-34分别刺激大鼠系膜细胞6，12，24，48h，采用半定量RT－PCR方法检测细胞TGF－β1 mRNA的表达，结果：（1）ELISA结果显示，hPTH1-34促进大鼠系膜细胞合成与分泌TGF－β1分泌作用达高峰（P＜0．01），（2）半定量RT－PCR方法结果显示，hPTH1-34促进大鼠系膜细胞TGF－β1 mRNA的表达，并具有浓度依赖和时间依赖性特点（各组与对照组间P＜0．05），结论：hPTH1-34从蛋白和基因水平显著促进系膜细胞TGF－β1的合成与分泌，且呈浓度依赖和时间依赖性特点。     

转化生长因子β1对人腹膜间皮细胞结缔组织生长因子的影响

目的 观察转化生长因子(TGF)β1对人腹膜间皮细胞(HPMCs)结缔组织生长因子(CTGF)的mRNA和蛋白表达影响并探讨其可能的机制。方法 原代培养HPMCs，用5ng／ml TGF-β1刺激第3代细胞，采用免疫组织化学染色、Western印迹、ELISA和RT-PCR等方法，观察CTGF的mRNA和蛋白表达、纤连蛋白(FN)和Ⅰ型胶原(ColⅠ)的mRNA和蛋白表达，细胞内磷酸化Smad2／3(p-Smad2／3)的蛋白表达以及在细胞内的迁移。结果 (1)刺激组CTGF的mRNA表达与对照组比均显著增加，其中48h为峰值；对照组细胞内仅有少量CTGF的蛋白表达，在TGF-β1刺激后24h表达明显增加，48h达峰值。(2)刺激组FN和ColⅠ的mRNA表达与对照组比均呈时间依赖性显著增加，上清液FN和细胞内ColⅠ的蛋白表达与对照组比也呈时间依赖性显著增加。(3)对照组细胞内几乎不表达p-Smad2／3(阳性细胞率3％)，在刺激后15min表达增加(29％)，细胞着色主要分散在胞质中；1h增加最明显(84％)，细胞着色加深且集中在胞核及周边；2h明显回落(37％)，细胞着色转淡并又分散至胞质中。结论TGF-β1在致腹膜纤维化过程中诱导了HPMCs内CTGF的转录和蛋白表达，可能与TGF-β1激活了HPMcs内Smad信号通路有关。     

Induction of TGF-beta1 by the matricellular protein SPARC in a rat model of glomerulonephritis

Induction of TGF-beta1 by the matricellular protein SPARC in a rat model of glomerulonephritis. BACKGROUND: SPARC has been implicated as a counteradhesive and antiproliferative protein associated with deposits of extracellular matrix in renal disease. METHOD: We have examined the effect of recombinant SPARC containing a C-terminal His tag (rSPARC) in an acute model of mesangial cell injury that is induced in the rat by an antibody against the Thy1 antigen on the mesangial cell membrane. The recombinant protein was administered 24 hours after the induction of nephritis and was infused through day 4. RESULTS: rSPARC was localized to the renal glomeruli of rats treated with anti-Thy1 antibody. Type I collagen and fibronectin, as well as transforming growth factor-beta1 (TGF-beta1), were increased at day 5 in rats treated with rSPARC (N = 4, P < 0.05 vs. delivery buffer), but only minimal effects were seen on mesangial cell and endothelial cell proliferation. In primary cultures of rat mesangial cells, infusion of rSPARC was associated with increases in TGF-beta1 mRNA and in total, secreted TGF-beta1 protein. CONCLUSIONS: rSPARC stimulates expression of TGF-beta1 both in vitro and in vivo. Given the closely regulated expression of SPARC, TGF-beta1, and type I collagen in several animal models of glomerulonephritis, we propose that SPARC could be one of the major mediators of the induction of TGF-beta1 in renal disease.     

终末期糖基化终产物通过转化生长因子依赖和非依赖途径介导NRK52E细胞转分化和胶原Ⅰ的合成

目的探讨终末期糖基化终产物（AGEs）介导肾小管上皮细胞转分化和胶原（Col）Ⅰ合成的分子机制。方法体外培养正常大鼠近端肾小管上皮细胞系（NRK52E），应用自制的AGE-牛血清白蛋白（BSA）刺激NRK52E细胞。免疫细胞化学方法检测不同时间磷酸化（P）Smad2／3核转位情况。ELISA方法检测细胞培养上清TGF-β1的水平。RT-PCR方法检测α-平滑肌肌动蛋白（SMA）、E-钙黏着糖蛋白（cadherin）和ColⅠmRNA表达。Western印迹检测α-SMA、E-cadherin和ColⅠ蛋白的表达。同时观察TGF-β1中和抗体对AGE-BSA上述效应的阻断作用。结果基础状态下，NRK52E细胞存在低水平p-Smad2／3核表达（16％）。与BSA对照组比较，AGE—BSA以时间依赖方式上调NRK52E细胞p-Smad2／3核转位，其高峰出现在30min（68％比30.5％，P〈0．01）和24h（76％比31．3％，P〈0．01）。AGE—BSA显著上调α-SMA和ColⅠmRNA和蛋白表达；下调E-cadherin mRNA和蛋白的表达；并能促进NRK52E细胞合成和分泌TGF-β1。TGF-β1中和抗体能明显抑制AGE—BSA介导的24hp-Smad2／3核转位（25．2％，P〈0．01），但不能阻抑30min活化高峰；能明显抑制AGE-BSA介导的α-SMA和ColⅠmRNA和蛋白表达．以及显著地上调E-cadherin mRNA和蛋白的表达。结论AGEs通过TGF-β依赖和非依赖途径诱导肾小管上皮细胞Smads信号通路活化，促进其向肌成纤维母细胞转分化和ColⅠ的合成。     

Role of STAT3 in the regulation of autophagy in the glomerular mesangial cells of diabetic nephropathy

Objective To observe the changes of STAT3 signaling transduction pathway and autophagy activity in human glomerular mesangial cells cultured in high glucose, as well as the effect of STAT3 on autophagy, exploring whether SAT3 further influence extracellular matrix proteins type IV collagen secretion through the regulation of autophagy. Methods Culture human renal mesangial cells under different conditions, STAT3 pathway was inhibited with specific blocking agent S3I-201 and siRNA respectively. The experiment was divided into: (1) Control group: normal glucose concentration; (2) High glucose group: divided into 12 h, 24 h, 48 h, 72 h incubation group. (3) High glucose+S3I-201 group: pretreated cells with 30 μmol/L S3I-201 (Selleck S1155) for 1 h, then incubation with high glucose for another 24 hours. (4) High glucose+STAT3-siRNA group: siRNA transfection firstly, then incubation with high glucose for 24 hours. (5) High glucose+S3I-201+3-MA group: pretreated cells with 2 mmol/L 3-MA (Selleck S2767) and 30 μmol/L S3I-201 for 1 h, then incubation with high glucose for another 24 hours. Western blot was employed to detect the protein of STAT3, p-STAT3 and autophagy related protein LC3, p62 expressions. The changes of autophagosome quantity was observed with transmission electron microscope. The extracellular matrix protein collagen IV expression was measured with ELISA. Results Compared with the control group, glomerular mesangial cells cultured with high glucose for 24h, the expressions of STAT3 and p-STAT3 increased (P＜0.01), while the expression of autophagy related proteins LC3II/LC3I decreased. The expression of p62 increased and the number of autophagosome reduced under transmission electron microscope, which all indicated the decrease of autophagy activity (P＜0.05). Blocking STAT3 signaling pathway with S3I-201 and STAT3-siRNA respectively, compared with high glucose group, LC3II/LC3I was up-regulated and p62 was down-regulated, and the number of autophagosome was increased significantly, which all indicated the increase of autophagy activity (P＜0.05). Extracellular matrix proteins collagen IV expression of cells cultured with high glucose was higher than the control group (P＜0.05), and the application of S3I-201 blocking STAT3 pathway caused type IV collagen expression to decrease (P＜0.05). The application of the autophagy inhibitor 3-MA could convert the result and lead to an increase of type IV collagen expression (P＜0.01). Conclusions High glucose could active STAT3 signaling pathway of human renal mesangial cell and increase STAT3, p-STAT3 expression. High glucose could inhibit autophagy activity of human renal mesangial cells. Inhibition of STAT3 pathway activation may reduce the inhibitory effect of high glucose on autophagy of human renal mesangial cells. High glucose leads to an increase of type IV collagen secretion of human glomerular mesangial cells. The activation of STAT3 pathway may increase type IV collagen secretion through negative regulation of autophagy, which eventually leads to diabetic nephropathy.     

Efficacy of antisense monocyte chemoattractant protein-1 (MCP-1) in a rat model of mesangial proliferative glomerulonephritis

Abstract

Objective: The effects of inhibition of monocyte chemoattractant protein-1 (MCP-1) on a rat model of mesangial proliferative glomerulonephritis (MsPGN) were evaluated. Methods: The anti-Thy-1 MsPGN model was developed by intravenously injecting anti-Thy-1 monoclonal antibodies into rats, followed by an injection of mesangial cells transfected with antisense MCP-1 into the renal artery. Exogenous cells were detected by in situ hybridization. Rats (40 total) were randomly divided into five groups: SO (sham operation), TG (Thy-1 glomerulonephritis model), MC (non-transfected normal rat mesangial cell), BC (pLXSN empty vector or blank control), and AM (antisense MCP-1 transfection) groups. Effects of exogenous MCP-1 on urinary protein excretion rate, biochemical parameters, and pathological changes were evaluated. Expression of MCP-1 and transforming growth factor-β₁ (TGF-β₁) were detected by immunohistochemistry. mRNA expression of MCP-1, TGF-β₁, and CC chemokine receptor 2 (CCR2) were detected by RT-PCR. Results: Exogenous MCP-1 cDNA was successfully transfected into mesangial cells. Exogenous mesangial cells were detected in glomeruli by in situ hybridization. Glomerular mesangial cell proliferation, 24-h urinary protein excretion rate, mRNA expression of MCP-1, TGF-β₁, and CCR2, and protein expression of MCP-1 all decreased in the AM group as compared to the control group (p?<?0.05), but there was no significant difference in the expression level of TGF-β₁ protein. Conclusions: (1) Mesangial cells can be used as a vector to transfect exogenous genes into kidneys; (2) antisense MCP-1 decreases mesangial cell proliferation and pathological injury in MsPGN model rats by decreasing expression of MCP-1 and CCR2; and (3) antisense MCP-1 suppressed mesangial cell proliferation and matrix accumulation in anti-Thy-1 MsPGN model rats, which did not entirely depend on TGF-β_1.     

Hepatocyte growth factor (HGF) modulates matrix turnover in human glomeruli

BACKGROUND: The imbalance between synthesis and degradation of mesangial matrix causes glomerulosclerosis and leads to renal failure. Hepatocyte growth factor (HGF) has been shown to reduce the progression in murine models of chronic renal failure. The present study evaluated the effect of HGF on the extracellular matrix turnover and on c-met receptor in human glomeruli. METHODS: Human glomeruli microdissected from donor kidney biopsies before transplantation were incubated with culture media containing HGF (50 ng/mL). After 24 and 48 hours, the expression of c-met, (alpha2) IV collagen, transforming growth factor-beta (TGF-beta), metalloprotease (MMP) 2 and 9 and of the inhibitor of MMP-2, tissue inhibitors of metalloprotease-1 (TIMP-1), was evaluated by polymerase chain reaction (PCR). beta-actin was used as housekeeping gene. The production of collagen type IV and TGF-beta was evaluated by enzyme-linked immunosorbent assay (ELISA) and Western blotting and the activity of MMP by zymography. RESULTS: (alpha2) IV collagen, TGF-beta, and TIMP-1 mRNA levels were markedly decreased in glomeruli treated with HGF at 24 and 48 hours. The expression of c-met was up-regulated by HGF treatment. HGF reduced the production of collagen type IV and TGF-beta. MMP-2 but not MMP-9 mRNA level was increased in HGF-treated glomeruli, although the gelatinolytic activity of the supernatant was not changed. By light microscopic examination kidney biopsies neither showed glomerular hypercellularity nor mesangial expansion. CONCLUSION: HGF reduced expression and synthesis of TGF-beta and collagen type IV and increased MMP-2 mRNA level in normal human glomeruli. These results suggest an antifibrotic effect of HGF on glomerular cells and may explain its beneficial role in glomerulosclerosis.     

腺病毒载体介导反义Src基因治疗胶质瘤

目的 探讨腺病毒载体介导的反义Src基因对胶质瘤生长的作用及其机制.方法 应用携带反义Src基因的重组腺病毒体外感染C6胶质瘤细胞,观察其对细胞形态、生长曲线和克隆形成率的影响.建立大鼠胶质瘤动物模型,原位注射重组腺病毒.观察其治疗作用,Western blot检测肿瘤组织Src、Ras、MAPK蛋白的表达,实时逆转录-聚合酶链反应(Real-time RT-PCR)检测肿瘤组织Caspase-3、Caspase-8 mRNA的表达.结果 体外研究表明感染反义Src基因的C6胶质瘤细胞生长受到显著抑制.体内研究表明应用携带反义Src基因的腺病毒原位注射治疗大鼠胶质瘤能够抑制肿瘤生长,减少Src、Ras、MAPK蛋白的表达,增加Caspase-3、Caspase-8 mRNA的表达.结论 腺病毒载体介导的反义Src基因能够抑制大鼠胶质瘤细胞的生长.Src-Ras-MAPK信号通路参与胶质瘤的生长,抑制该信号通路可以增加凋亡通路关键蛋白Caspase-3、Caspase-8的表达.     

megsin基因转染对高糖环境中肾小球系膜细胞增殖和基质金属蛋白酶2及其抑制因子表达的影响

目的 观察megsin基因转染对高糖环境中肾小球系膜细胞基质金属蛋白酶2（MMP-2）和组织金属蛋白酶抑制因子2（TIMP-2）的表达及Ⅳ型胶原水平的影响,探讨megsin与系膜细胞增殖和细胞外基质代谢的关系。 方法 高糖环境中培养小鼠肾小球系膜细胞,分别于培养12、24、48 h末,应用MTT法检测细胞增殖程度;Western印迹法检测系膜细胞megsin、MMP-2、TIMP-2蛋白表达水平;放免法检测细胞培养上清Ⅳ型胶原浓度。 结果 高糖环境中肾小球系膜细胞megsin、TIMP-2表达上调,MMP-2表达下调,细胞增殖明显,细胞上清液中Ⅳ型胶原浓度升高。megsin基因转染后上述变化趋势更加显著。 结论 megsin可诱导系膜细胞增殖,并通过上调TIMP-2、下调MMP-2抑制细胞外基质降解,是加速肾小球硬化的可能机制之一。     

人磷酸二脂酶基因反义RNA重组腺病毒载体的构建

目的探讨人磷酸二脂酶5(PDE5)基因反义RNA重组腺病毒载体的构建方法。方法根据基因库确定具有完整PDE5A1启动子活性的cDNA基因序列,并设计反义链,两'端加内切酶修饰;通过转载体克隆方法构建转入载体(pENTR)并测序;借助Gateway腺病毒表达载体系统进行重组反应构建重组腺病毒表达载体pAd/CMV/V5/antisense PDE5A1;PacⅠ酶切后转染293A细胞系进行包装、扩增;病毒质粒酶切后电泳鉴定及PCR检测;CsCl梯度离心法纯化病毒,病毒空斑实验进行滴度测定。结果pENTR载体测序证实目的基因序列及插入方向正确;pAd/CMV/V5/antisense PDE5A1酶切后电泳鉴定,可见145bp的片段;PCR检测证明实验设计的目的反义基因成功插入腺病毒载体中;重组腺病毒滴度达108～1010/μl。结论借助Gateway腺病毒表达载体系统可成功地将人工合成的反义基因装入到腺病毒载体中;纯化病毒液量和滴度符合体内基因转染实验的要求。