食管鳞癌细胞HIF-1α与survivin的关系

目的探讨食管鳞癌细胞Eca-109中缺氧诱导因子-1α基因（HIF-1α）与抗凋亡基因生存素survivin的关系。方法培养食管鳞癌细胞Eca-109,用氯化钴模拟缺氧以促进HIF-1α表达,再以RNA干扰抑制HIF-1α基因表达,Westernblot法检测其中HIF-1α和survivin的表达。结果氯化钴培养后Eca-109细胞的HIF-1α蛋白表达增加,survivin蛋白表达也增加,并与氯化钴浓度有关;以RNA干扰方法抑制了HIF-1α基因的干扰细胞（Eca-109／shRNA）中HIF—1α蛋白表达减少,survivin蛋白表达也减少。结论在食管鳞癌细胞Eca-109中,HIF—1α基因和survivin表达具有高度的相关性,抑制HIF-1α表达可能通过抑制survivin而促进肿瘤细胞的凋亡。     

氯化钴对RNA干扰食管鳞癌细胞HIF-1α基因表达及功能的影响

目的研究氯化钴模拟缺氧对RNA干扰的缺氧诱导因子-1α（HIF-1α）基因表达及功能的影响，观察在人食管鳞癌细胞系Eca-109中RNA干扰抑制HIF-1α的效果。方法选择4组细胞分别为食管癌Eca-109细胞和3株稳定转染HIF-1αSiRNA的Eca-109细胞（本实验室编号分别为H2／14号、H3／15号、H2／20号细胞），分别用200、400、600、800μmol／L氯化钴模拟缺氧，缺氧培养时间分别为12、24．48、72h，采用Western印迹和逆转录聚合酶链反应（RT-PCR）检测HIF—1α蛋白及mRNA表达，同时Western印迹检测血红素加氧酶（HO-1）、基质金属蛋白酶-2（MMP-2）、葡萄糖转运体-1（Glut-1）、P53等相关基因的表达。结果4组细胞HIF-1α蛋白表达均随氯化钴浓度加大而增加，常氧与400μmol／L氯化钴处理24h后筛选出H3／15号细胞HIF-1α蛋白表达最少，与其它3组相比差异有统计学意义（P〈0．05），mRNA检测差异无统计学意义；干扰细胞常氧下HO-1、MMP-2、Glut-1、P53表达不同程度减少，缺氧后HO-1、P53表达增加，MMP-2、Glut-1表达无明显变化。结论RNA干扰能抑制Eca-109细胞的HIF-1α基因表达，从而不同程度减少HO-1、MMP-2、Glut-1、P53等相关基因表达；经氯化钴模拟缺氧筛选出干扰效果较好的一株细胞，为进一步研究HIF-1α的功能奠定了基础。     

RNA干扰HIF-1α对血管生成拟态相关基因表达的影响

目的: 探讨常氧及缺氧培养条件下RNA干扰沉默人食管鳞癌细胞Ec a-109缺氧诱导因子-1α(HIF-1α)对血管生成拟态相关基因表达的影响.方法: 选择未转染处理的食管鳞癌Eca-109细胞和3株稳定转染HIF-1α SiRNA的Eca-109细胞, 分别予以常氧和缺氧培养, 缺氧培养12、24、36、48、60、72、96 h, 采用Western blot法和逆转录聚合酶链反应(RT-PCR)检测HIF-1α蛋白及mRNA表达, 同时Western blot法检测上皮细胞激酶(EphA2)、血管上皮钙黏附素(VE-cadherin)、基质金属蛋白酶-2(MMP-2)、层粘连蛋白5γ2链(LN-5γ2)等血管生成拟态相关基因的表达.结果: 缺氧条件下培养Eca-109细胞HIF-1α蛋白表达较常氧时增高, 以24-48 h为明显, 72-96h开始减弱, 而HIF-1α mRNA检测差异无统计学意义( F = 0.70, P = 0.67);RNA干扰后细胞在常氧下HIF-1α、EphA2、LN-5γ2蛋白几乎无表达, 缺氧后亦无增强现象, VE-cadherin、MMP-2蛋白表达较未干扰细胞稍有减弱, 缺氧后表达稍增强, 但差异无显著性(均P>0.05).结论: RNA干扰能抑制Eca-109细胞的HIF-1α基因表达, HIF-1α基因沉默后可以不同程度减少EphA2、LN-5γ2等血管生成拟态相关基因的表达.     

RNA干扰体外抑制人食管鳞癌细胞Eca-109缺氧诱导因子-1α的表达

目的:观察缺氧诱导因子-1α(hypoxia inducible factor-1α,HIF-1α)短发夹状RNA(short hairpin RNA,shRNA)对人食管鳞癌细胞系Eca-109中 HIF-1α基因的沉默效应,筛选有效干扰靶点．方法:设计合成干扰缺氧诱导因子-1α RNA 寡核苷酸片段,经退火、连接等步骤克隆至线性化的PGCsi真核表达载体上,测序鉴定．应用LipofectamineTM2000将该质粒分别转染Eca-109细胞和293T细胞,其中Eca-109抗性细胞又经2-4 wk的G418筛选．荧光显微镜评估转染效率,荧光定量RT-PCR检测HIF-1α mRNA表达情况,western blot检测HIF-1α蛋白表达情况．结果:成功构建了3个靶点的重组质粒pGCsi- H1-shHIF,293T细胞平均转染效率为约85．4％, Eca-109细胞的平均转染效率约73．2％．荧光定量RT-PCR和Western blot显示瞬时转染这3种重组质粒的293T细胞和筛选2 wk的Eca-109 细胞HIF-1 α mRNA和蛋白表达均较对照组有不同程度的下降,其中2号和3号靶点的干扰效应尤为明显．在瞬时转染72 h后的293T 细胞中,其抑制率分别达到了78．5％、86．9％ (P=0．000,P=0．000 vs 72 h空白对照组),筛选2 wk的Eca-109细胞中,3号靶点对HIF-1α mRNA的抑制率也达到了69．7％(P=0．000 vs 2 wk空白对照组)．结论:重组质粒pGCsi-shHIF能有效抑制食管鳞癌细胞Eca-109中HIF-1α基因的表达,经不同细胞中的瞬时和稳定转染筛选出了有效干扰靶位．     

核糖核酸干扰缺氧诱导因子-1α对食管鳞癌细胞的抑制效果研究

目的 探讨人食管鳞癌细胞系Eca-109中RNA干扰抑制缺氧诱导因子(HIF)-1α的体内、外实验效果.方法 用针对HIF-1α mRNA的小发夹RNA(shRNA)真核表达载体转染人食管鳞癌细胞Eca-109,检测HIF-1α、基质金属蛋白酶(MMP)-2、葡萄糖载体蛋白(GLUT)-1表达,挑选干扰效果最好的细胞命名为Eca-109/shRNA,流式细胞仪检测细胞凋亡率.6周龄BALB/C裸鼠30只,按皮下注入细胞不同均分为三组,A组为Eca-109,B组为转染空质粒Eca-109(Eca-109/Neo),C组为Eca-109/shRNA.观察肿瘤出现时间,测量裸鼠体质量、瘤体大小,计算肿瘤体积.28 d后处死全部裸鼠,取瘤体称重.用Western印迹法检测肿瘤组织HIF-1α蛋白、血管内皮生长因子(VEGF)、凋亡抑制蛋白bcl-2和生存素的表达.结果 Eca-109/shRNA细胞的HIF-1α蛋白表达明显被抑制,同时MMP-2,GLUT-1表达也明显下调,细胞凋亡率为(21.32±1.12)%,比Eca-109细胞和Eca-109/Neo细胞[(1.17±0.85)%和(5.31±1.46)%]明显升高(P＜0.01).A、B组裸鼠接种1周左右成瘤,C组裸鼠2周左右成瘤,成瘤时间较A、B组延迟,且瘤体生长减慢.28 d后移植瘤体积:A组为(1.29±0.34)cm3,B组为(1.19±0.35)cm3,C组为(0.45±0.20)cm3.瘤重:A组为(0.73±0.13)g,B组为(0.71±0.15)g,C组为(0.21±0.11)g.C组与A、B组比较移植瘤体积和瘤重差异均有统计学意义(P值均＜0.01),抑瘤率达65%.Western印迹检测蛋白表达,C组HIF-1α、VEGF、bcl-2和生存素表达均比A、B组明显减少(P值均＜0.01).结论 在食管癌Eca-109细胞中利用RNA干扰HIF-1α能抑制肿瘤生长,其机制为抑制VEGF介导的肿瘤血管生成和无氧糖酵解,可能与影响bcl-2和生存素的表达,促进肿瘤细胞凋亡有关.     

食管鳞癌细胞系EC-109中缺氧诱导因子-1α的表达意义

目的:探讨缺氧诱导因子-1α(HIF-1α)在食管鳞癌细胞系EC-109中的表达及其意义.方法:采用逆转录聚合酶链反应(RT-PCR)和Westernblot分别检测HIF-1αmRNA和蛋白在常氧及缺氧状态下在食管鳞癌EC-109细胞中的表达.结果:HIF-1αmRNA在缺氧食管鳞癌EC-109细胞中过表达(P<0.05),在缺氧24h时HIF-1αmRNA表达最高,其后随时间延长表达下降;HIF-1α蛋白水平在缺氧食管鳞癌EC-109细胞中无明显上调(P>0.05).结论:低氧可诱导食管鳞癌EC-109细胞中HIF-1αmRNA的过度表达,缺氧状态下HIF-1α蛋白水平较常氧时无明显增加.     

缺氧诱导因子-1α与EphA2在食管鳞状细胞癌中的表达及其相关性研究

目的 检测缺氧诱导因子-1α (HIF-1α) 蛋白与EphA2蛋白在食管鳞状细胞癌中的表达定位并探讨二者表达的相关性.方法 采用细胞免疫荧光法检测HIF-1α与EphA2在食管鳞状细胞癌细胞株Eca109中的表达与定位;采用免疫组化法检测HIF-1α与EphA2在41例食管鳞状细胞癌和25例正常食管组织中的表达;常氧和缺氧条件下,Western 印迹法检测食管鳞状细胞癌细胞株Eca109和TE13经RNA干扰(RNAi)技术特异性沉默HIF-1α后EphA2表达的变化.结果 ①细胞免疫荧光结果显示HIF-1α和EphA2均在Eca109细胞胞质表达.②免疫组化结果显示HIF-1α在食管鳞状细胞癌和正常食管组织中的阳性表达率分别为70.73%(29/41)和0%(0/25),两者比较差异有统计学意义(P<0.05).EphA2在食管鳞状细胞癌和正常食管组织中的阳性表达率分别为78.04%(32/41)和28%(7/25),两者比较差异有统计学意义(P<0.05).相关性检验提示HIF-1α和EphA2在食管鳞状细胞癌中表达呈正相关性(r=0.5654,χ~2=13.11,P<0.05).③ Western印迹结果显示在食管鳞状细胞癌细胞株Eca109和TE13中,EphA2表达随HIF-1α的沉默而受抑制.结论 HIF-1α与EphA2在食管鳞状细胞癌组织中呈高表达,且二者表达呈正相关;EphA2表达受HIF-1α的调控,可能为HIF-1α的靶基因.     

5-Aza-CdR对食管鳞癌甲基化基因的影响

目的探讨5-aza-CdR对食管鳞癌甲基化基因的影响。方法应用人类全基因组寡核苷酸微阵列芯片,荧光双交换法检测5-aza-CdR干预的食管鳞癌细胞Eca-109与正常培养的Eca-109细胞中的差异表达基因,并进行生物信息学分析。结果经统计学分析,共筛选获得384个差异表达基因,其中303个基因表达上调,81个基因表达下调;差异基因的功能涉及信号转导、物质合成代谢、细胞周期、细胞增殖、细胞凋亡、DNA转录、DNA复制、DNA修复、氧化还原、物质运输、免疫反应等;上调表达基因中有138个基因分别含有1～5个CpG岛序列,占总上调基因的45.54%。结论5-aza-CdR可以影响食管鳞癌细胞中基因异常的甲基化修饰,调控肿瘤细胞的异常凋亡和分化,为进一步研究食管鳞癌致病分子机制,提供表观遗传学的依据。     

SEPT9基因在人肝细胞癌侵袭转移中的作用

目的研究SEPT9基因对人肝癌细胞侵袭转移的影响。方法通过westernblot法筛选SEPT9蛋白高表达肝癌细胞系,慢病毒转染沉默后检测细胞SEPT9蛋白表达量,通过EdU染色检测sh-SEPT9对肝癌细胞增殖的影响;Transwell和划痕实验检测沉默SEPT9表达后肝癌细胞的侵袭能力和迁移能力;westernblot分析沉默SEPT9表达对肝癌细胞HIF-1α、Ki67、PCNA、MMP-9、VEGF、Vimentin, N-cadherin、E-cadherin蛋白表达影响。结果 westernblot显示SEPT9蛋白在肝癌HepG2细胞存在高表达,慢病毒转然能够获得稳定遗传的HepG2-SEPT9-shRNA细胞系,sh-SEPT9转然后,EdU染色显示HepG2细胞增殖受到明显抑制(P0.05),细胞的侵袭能力和迁移能力显著降低(P0.05);HepG2细胞Ki67、PCNA、Vimentin、N-cadherin、HIF-1α、MMP-9及VEGF表达量明显降低,E-cadherin的蛋白水平明显上升(P0.05)。结论 SEPT9基因通过增强肝癌HepG2细胞的EMT机制,促进肝癌HepG2细胞的侵袭转移。     

重组腺病毒Ad/siRNA/环氧合酶-2的构建及其抑制食管癌细胞的效果

目的观察腺病毒介导的RNA干扰（RNAi）技术对人食管鳞癌细胞（Eca-109）环氧合酶（COX）-2基因表达的抑制效果及其对Eca-109细胞生长的影响。方法采用含RNA聚合酶Ⅲ启动子H1的质粒pSUPER构建针对人COX-2 mRNA的重组质粒psiRNA COX-2。Not Ⅰ和Xho Ⅰ双酶切psiRNA/COX-2 得到siRNA/COX-2表达片段．定向克隆至腺病毒穿梭质粒pAdTrack的相同位点得到pAdTrack/siRNA／COX-2．后者与骨架质粒pAdEasy-1在大肠杆菌BJ5183中同源重组得到腺病毒Ad/siRNA／COX-2．经293细胞包装、扩增后转染Eca-109细胞。ELISA法测定培养液上清的前列腺素（PG）E2浓度，PCR法检洲细胞COX-2 mRNA水平．流式细胞仪检测细胞凋亡与周期分布．绘制细胞生长曲线。结果重组腺病毒Ad／siRNA/COX-2构建成功．转染Eca-109细胞后．细胞COX-2 mRNA水平下降71．7％（P〈0．01）．培养液上清PGE2浓度下降62．0％（P〈0．01）；细胞生长明显减缓．G0-G1期细胞比例增加、S期与G2-M期细胞比例减少（P〈0.01）．细胞凋产增多（P〈0.01）。结论腺病毒介导的RNAi技术可显著抑制人食管鳞癌细胞COX-2基因表达．从而导致肿瘤细胞增殖减缓、凋亡增加。     

外源性牛初乳短链IGF-1治疗改善糖尿病大鼠GH/IGF-1轴的紊乱

目的　观察外源性牛初乳短链胰岛素样生长因子 - 1(BC- t IGF- 1)对糖尿病生长激素 GH/ IGF- 1轴的影响。方法　链脲佐菌素 (STZ) 5 5 mg/ kg空腹腹腔注射 (IP)制备糖尿病大鼠模型 ,随机分为糖尿病对照组 (DM- C,生理盐水0 .1ml/ d IP)和糖尿病治疗组 (DM- BC,BC- t IGF- 12 5 0 ng/ kg· d- 1 IP)。并设正常对照组 (NC) ,每组 n=5。治疗前测定尾尖血血糖 (BG0 ) ,治疗 6周后测定尾尖血血糖 (BG)、血清果糖胺 (FMN)、甘油三酯 (TG)、胆固醇 (CHO)、GH、IGF- 1和肝脏 IGF- 1含量。结果　与 NC相比 ,DM- C血清 FMN、TG明显升高同时血清 GH升高而血清和肝脏 IGF- 1降低 ;与DM- C相比 ,DM- BC血清 FMN、TG明显降低同时血清 GH降低而肝脏 IGF- 1显著升高。结论　外源性 BC- t IGF- 1治疗改善糖尿病大鼠代谢同时改善了糖尿病时的 GH/ IGF- 1轴的紊乱     

Sphingosine kinase 1 pathway is involved in melatonin-induced HIF-1α inactivation in hypoxic PC-3 prostate cancer cells

Sphingosine kinase 1 (SPHK1) is a newly discovered modulator of hypoxia inducible factor 1α (HIF-1α) with various biological activities such as cell growth, survival, invasion, angiogenesis, and carcinogenesis. Thus, in the present study, the biological mechanisms of melatonin were elucidated in association with SPHK1 pathway in PC-3 prostate cancer cells under hypoxia. Melatonin inhibited the stability of HIF-1α in a time- and concentration- dependent manners. Also, melatonin decreased SPHK1 activity in PC-3 cells during hypoxia. Furthermore, melatonin suppressed AKT/glycogen synthase kinase-3β (GSK-3β) signaling pathway, which stabilizes HIF-1α via inhibition of von Hippel-Lindau tumor suppressor protein. Consistently, siRNA-SPHK1 and sphingosine kinase inhibitor (SKI) effectively blocked the expression of HIF-1α, phospho-AKT and vascular endothelial growth factor (VEGF) production in PC-3 cells under hypoxia, suggesting the role of SPHK1 in melatonin-inhibited HIF-1α accumulation. Moreover, reactive oxygen species (ROS) scavenger N-acteylcysteine enhanced melatonin-inhibited HIF-1α expression and SPHK1 activity. Overall, our findings suggest that melatonin suppresses HIF-1α accumulation via inhibition of SPHK1 pathway and ROS generation in PC-3 cells under hypoxia.     

Succinate dehydrogenase-deficient gastrointestinal stromal tumors

Most gastrointestinal stromal tumors(GISTs)are characterized by KIT or platelet-derived growth factor alpha(PDGFRA)activating mutations.However,there are still 10%-15%of GISTs lacking KIT and PDGFRA mutations,called wild-type GISTs(WT GISTs).Among these so-called WT GISTs,a small subset is associated with succinate dehydrogenase(SDH)deficiency,known as SDH-deficient GISTs.In addition,GISTs that occur in Carney triad and Carney-Stratakis syndromerepresent specific examples of SDH-deficient GISTs.SDH-deficient GISTs locate exclusively in the stomach,showing predilection for children and young adults with female preponderance.The tumor generally pursues an indolent course and exhibits primary resistance to imatinib therapy in most cases.Loss of succinate dehydrogenase subunit B expression and overexpression of insulin-like growth factor 1 receptor(IGF1R)are common features of SDH-deficient GISTs.In WT GISTs without succinate dehydrogenase activity,upregulation of hypoxia-inducible factor 1αmay lead to increased growth signaling through IGF1R and vascular endothelial growth factor receptor(VEGFR).As a result,IGF1R and VEGFR are promising to be the novel therapeutic targets of GISTs.This review will update the current knowledge on characteristics of SDH-deficient GISTs and further discuss the possible mechanisms of tumorigenesis and clinical management of SDH-deficient GISTs.     

Effects of N-acetylcysteine on expression of transforming growth factor-β1 in diabetic nephropathy rats

Objective To investigate the effects of N-acetylcysteine (NAC) on the expression of transforming growth factor-β1 (TGF-β1) in renal cortex of diabetic nephropathy rats.Methods A rat model of DN was established.The rats were randomly divided into control group,DN group and NAC group.After 8 weeks treatment,urinary albumin excretion rate (UAER) was determined.The expression of TGF-β1 in renal cortex was detected by immunohistochemistry and RT-PCR analysis.Pathomorphological changes of renal cortex were observed.Results (1)The levels of UA ER were significantly higher in DN group and NAC group [(1268.3±297.5) μg/24 h and (315.9-±86.8) μg/24 h] than in control group [(31.2±8.9) μg/24 h,q-29.85,16.76,both P＜0.01].The groups of DN and NAC versus group of control showed the increased levels of activity of TGF-β1 in renal cortex [immune-histochemistry index of glomerular mesangial area:7.35±1.17 and 3.87 ± 0.71 vs.1.95±0.34,q= 10.75,5.82,both P＜0.01];immune-histochemistry index of renal tubulointerstitium [21.21± 3.78 and 10.67±1.86 vs.3.62±0.79,q=15.20,11.36,both P＜0.01];the expression of mRNA in renal cortex[0.72±0.06 and 0.45±0.05 vs.0.23±0.04,q=9.13,7.45,both P＜0.01].The pathomorphological changes were significant in DN group and NAC group.(2)The NAC group versus DN group showed a decreased levels of UAER (q=8.17,P＜0.01),activity of TGF-β1 in renal cortex [immune-histochemistry index of glomerular mesangial area:q= 4.97,P＜0.01]immune-histochemistry index of renal tubulointerstitium (q = 6.86,P ＜ 0.01 );the expression of mRNA in renal cortex (q= 3.69,P＜0.05) and showed improvement of pathomorphology in renal cortex.(3) There was a significantly positive correlation between expression quantity of TGF-β1 mRNA in renal cortex and UAER level in NAC group(r= 0.749,P＜0.05).Conclusions The protective effects of NAC on the kidney of DN rats may be partly related with inhibition on the expression of TGF-β1.     

Effects of N-acetylcysteine on expression of transforming growth factor-β1 in diabetic nephropathy rats

Objective To investigate the effects of N-acetylcysteine (NAC) on the expression of transforming growth factor-β1 (TGF-β1) in renal cortex of diabetic nephropathy rats.Methods A rat model of DN was established.The rats were randomly divided into control group,DN group and NAC group.After 8 weeks treatment,urinary albumin excretion rate (UAER) was determined.The expression of TGF-β1 in renal cortex was detected by immunohistochemistry and RT-PCR analysis.Pathomorphological changes of renal cortex were observed.Results (1)The levels of UA ER were significantly higher in DN group and NAC group [(1268.3±297.5) μg/24 h and (315.9-±86.8) μg/24 h] than in control group [(31.2±8.9) μg/24 h,q-29.85,16.76,both P＜0.01].The groups of DN and NAC versus group of control showed the increased levels of activity of TGF-β1 in renal cortex [immune-histochemistry index of glomerular mesangial area:7.35±1.17 and 3.87 ± 0.71 vs.1.95±0.34,q= 10.75,5.82,both P＜0.01];immune-histochemistry index of renal tubulointerstitium [21.21± 3.78 and 10.67±1.86 vs.3.62±0.79,q=15.20,11.36,both P＜0.01];the expression of mRNA in renal cortex[0.72±0.06 and 0.45±0.05 vs.0.23±0.04,q=9.13,7.45,both P＜0.01].The pathomorphological changes were significant in DN group and NAC group.(2)The NAC group versus DN group showed a decreased levels of UAER (q=8.17,P＜0.01),activity of TGF-β1 in renal cortex [immune-histochemistry index of glomerular mesangial area:q= 4.97,P＜0.01]immune-histochemistry index of renal tubulointerstitium (q = 6.86,P ＜ 0.01 );the expression of mRNA in renal cortex (q= 3.69,P＜0.05) and showed improvement of pathomorphology in renal cortex.(3) There was a significantly positive correlation between expression quantity of TGF-β1 mRNA in renal cortex and UAER level in NAC group(r= 0.749,P＜0.05).Conclusions The protective effects of NAC on the kidney of DN rats may be partly related with inhibition on the expression of TGF-β1.     

Effects of N-acetylcysteine on expression of transforming growth factor-β1 in diabetic nephropathy rats

Objective To investigate the effects of N-acetylcysteine (NAC) on the expression of transforming growth factor-β1 (TGF-β1) in renal cortex of diabetic nephropathy rats.Methods A rat model of DN was established.The rats were randomly divided into control group,DN group and NAC group.After 8 weeks treatment,urinary albumin excretion rate (UAER) was determined.The expression of TGF-β1 in renal cortex was detected by immunohistochemistry and RT-PCR analysis.Pathomorphological changes of renal cortex were observed.Results (1)The levels of UA ER were significantly higher in DN group and NAC group [(1268.3±297.5) μg/24 h and (315.9-±86.8) μg/24 h] than in control group [(31.2±8.9) μg/24 h,q-29.85,16.76,both P＜0.01].The groups of DN and NAC versus group of control showed the increased levels of activity of TGF-β1 in renal cortex [immune-histochemistry index of glomerular mesangial area:7.35±1.17 and 3.87 ± 0.71 vs.1.95±0.34,q= 10.75,5.82,both P＜0.01];immune-histochemistry index of renal tubulointerstitium [21.21± 3.78 and 10.67±1.86 vs.3.62±0.79,q=15.20,11.36,both P＜0.01];the expression of mRNA in renal cortex[0.72±0.06 and 0.45±0.05 vs.0.23±0.04,q=9.13,7.45,both P＜0.01].The pathomorphological changes were significant in DN group and NAC group.(2)The NAC group versus DN group showed a decreased levels of UAER (q=8.17,P＜0.01),activity of TGF-β1 in renal cortex [immune-histochemistry index of glomerular mesangial area:q= 4.97,P＜0.01]immune-histochemistry index of renal tubulointerstitium (q = 6.86,P ＜ 0.01 );the expression of mRNA in renal cortex (q= 3.69,P＜0.05) and showed improvement of pathomorphology in renal cortex.(3) There was a significantly positive correlation between expression quantity of TGF-β1 mRNA in renal cortex and UAER level in NAC group(r= 0.749,P＜0.05).Conclusions The protective effects of NAC on the kidney of DN rats may be partly related with inhibition on the expression of TGF-β1.     

胰岛素样生长因子1与原发性高血压

目的:探讨原发性高血压病的发病机制。方法:对28例原发性高血压患者和16名正常人测定了血清胰岛素样生长因子1(IGF1),并与高血压分级进行了相关分析。结果:原发性高血压患者IGF1水平显著低于正常人(分别为26.22μg/L±20.23μg/L和48.02μg/L±33.43μ/L,P<0.05),且IGF1水平与临床分级呈负相关(=-0.437,P<0.05)。 结论:IGF1可能参与了原发性高血压的病理生理过程。     

IL-10对大鼠肝纤维化的治疗作用及对TNF-α、IGF-1及IGF-1R表达的影响

目的外源性白介素-10(IL-10)对大鼠肝纤维化的治疗作用及对肿瘤坏死因子-α(TNF-α)和胰岛素样生长因子-1(IGF-1)及其受体(IGF-1R)表达的影响.方法40只SD大鼠随机分为正常对照组和CCl4诱发肝纤维化模型组.至造模第9周,模型组随机分为3组,S组造模结束即处死,Ⅰ组IL-10治疗2周后处死,R组为自然恢复2周后处死.通过HE染色评价各组肝纤维化的程度,SP免疫组化检测各组大鼠肝脏TNF-α、IGF-1、IGF-1R表达情况.结果肝病理组织学显示:I组纤维化程度有明显改善,R组纤维化程度没有明显改善.TNF-α、IGF-1、IGF-1R在S组表达显著升高(P＜0.05),在R组及Ⅰ组表达下降,但Ⅰ组下降较R组明显,与R组比较差别有显著意义(P＜0.05).结论外源性IL-10能明显抑制炎性细胞因子TNF-α的表达和IGF-1及IGF-1R的表达,这可能是IL-10对大鼠肝纤维化治疗作用的机制之一.