Analysis of human transforming growth factor β-induced gene mutation in corneal dystrophy

Background Corneal dystrophy is a group of inherited blinding diseases of the cornea. This study was to identify the mutations of the keratoepithelin (KE) gene for proper diagnosis of corneal dystrophy. Methods Three families with corneal dystrophy were analysed. Thirteen individuals at risk for corneal dystrophy in family A, the proband and her son in family B, and the proband in family C were examined after their blood samples were obtained. Mutation screening of human transforming growth factor 15-induced gene (BIGH3 gene) was performed. Results Five individuals in family A were found by clinical evaluation to be affected with granular corneal dystrophy and carried the BIGH3 mutation W555R. However, both probands in families B and C, also diagnosed with granular corneal dystrophy, harboured the BIGH3 mutation R124H. Conclusion Molecular genetic analysis can improve accurate diagnosis of corneal dystrophy.     

The expressions of transforming growth factor β1,TGFβRⅠ and TGFβRⅡ gene in large intestine polyps and cancer

目的:探讨转化生长因子β1 (TGFβ1)、转化生长因子β受体Ⅰ(TGFβRⅠ)、Ⅱ在大肠癌发生中的可能作用.方法:免疫组织化学法检测110例大肠息肉(息肉组,其中高危型大肠腺瘤50例)、各期大肠癌(大肠癌组)40例及正常大肠组织(正常组)20例TGFβ1,TGFβRⅠ、TGFβRⅡ的表达.结果:息肉组、大肠癌组和正常组间TGFβ1、TGFβRⅡ表达差异有统计学意义(P＜0.01),而3组间TGFβRⅠ表达差异无统计学意义(P>0.05);高危型大肠腺瘤与Duke′s A期大肠癌TGFβ1表达差异有统计学意义(P＜0.05),而2组间TGFβRⅠ、TGFβRⅡ表达均无统计学意义(P>0.05).结论:TGFβ1、TGFβRⅡ在正常组、息肉组、大肠癌组间有不同,提示该指标可能参与大肠癌发生,TGFβ1可能在大肠腺瘤癌变早期起作用.     

Smad signal transduction pathway involved in supression of VEGF on TGF-β1 induced EMT of HK-2 cells

目的 探讨血管内皮生长因子(VEGF)抑制转化生长因子-β1(TGF-β1)诱导HK-2细胞发生肾小管上皮-间充质细胞转化(EMT)的过程中对Smad 2/3,Smad 7信号途径以及SnoN表达的影响.方法 体外培养的HK-2细胞分为:①正常对照组;②TGF-β1(5μgL)阳性对照组;③VEGF165(100μg/L)作用组;④TGF-β1(5 μg/L)+ VEGF165(100 μg/L)共同作用组.采用Western Blot法和RT-PCR分别检测各组细胞p-Smad 2/3和Smad 2/3(共同作用30和60 min),α-平滑肌肌动蛋白(α-SMA)、Smad 7 、SnoN的表达水平(共同作用48 h).结果 TGF-β1组α-SMA蛋白和mRNA表达与正常对照组比较明显增强,TGF-β1与VEGF165共同作用组α-SMA蛋白和mRNA表达与TGF -β1单独作用组比较明显减弱(P＜0.05).体外HK-2细胞,TGF-β1组刺激30、60 min,与正常对照组比较,(p-Smad 2/3)/(Smad 2/3)比值明显升高,TGF-β1 +VEGF165组与TGF-β1单独作用组相比明显下降,且以30 min时下降明显.TGF-β1组作用48h与正常对照组比较,Smad7蛋白和mRNA表达明显下降,VEGF165+TGF-β1组较TGF-β1单独作用组Smad 7表达明显升高(P＜0.05).VEGF165组与正常对照组相比,α-SMA、(p-Smad 2/3 )/(Smad 2/3)、Smad 7蛋白和mRNA表达的差异无统计学意义(P＞0.05).TGF-β1组SnoN蛋白表达与正常对照组比较明显增强(P＜0.05),TGF-β1与VEGF165共同作用组SnoN蛋白表达与TGF-β1单独作用组相比差异无统计学意义(P＞0.05),各组SnoN mRNA表达差异均无统计学意义(P＞0.05).结论 VEGF165抑制TGF-β1诱导HK-2细胞EMT的机制可能与直接抑制Smad 2/3磷酸化、上调Smad 7信号表达有关,而与调节SnoN表达无关.     

护肝片对纤维化肝组织TGFβ1I型受体表达的抑制作用

目的:观察护肝片对中、晚期纤维化肝组织转化生长因子-β1I型受体(Tβ1RⅠ)蛋白及其mRNA表达的影响.方法:采用125 g/L CCl4诱导的大鼠肝纤维化模型,用免疫组化S-P法检测大鼠肝组织Tβ1RⅠ蛋白的表达;用原位杂交检测Tβ1RⅠmRNA的表达.用MetaMorph图像分析系统对Tβ1RⅠ蛋白及mRNA的表达量进行定量分析.结果:①模型复制8周和13周,模型组的肝损伤及其纤维化分级均显著高于正常组(P<0.01),护肝片组的肝损伤及其纤维化分级均轻于模型组.②模型复制8周和13周,模型组Tβ1RⅠ蛋白及mRNA的表达均较正常组显著增多(P<0.01);其蛋白和mRNA的表达相互间均呈显著正相关(P<0.01).③除13周 Tβ1RⅠ蛋白外,护肝片均显著抑制模型复制8周和13周后纤维化肝组织Tβ1RⅠ蛋白及其mRNA的表达(P<0.01).结论:护肝片可减轻肝组织的损伤及其纤维化程度,它可能在蛋白及mRNA双重水平上抑制Tβ1RⅠ的表达,从而发挥抗肝纤维化作用.     

Clinical significance of interleukin-17 producing cell infiltration with TGF-β1 expression in glioma

Objective To investigate correlation between the amount of interleukin-17 (IL-17) producing cells and the expression of transforming growth factor (31 (TGF-β1) in glioma,and evaluate the clinical values of IL-17 and TGF-pl in predicting the prognosis of glioma. Methods The presence of IL-17 and TGF-pl was measured by immunohistochemistry in 135 human glioma (WHO Ⅰ 18,WHO Ⅱ 45,WHO Ⅲ 53,WHO Ⅳ 19) tissues and 15 normal brain tissues. Results There was no IL-17 positive staining in normal brain tissues. Of 135 glioma specimens showed low TGF-pl expression and 77 (57. 03% ) showed high TGF-pl expression. No TGF-β1 expression was detected in normal brain tissue. Furthermore,TGF-β1 expression was positively correlated with the amount of IL-17 producing cells in glioma tissues ( r=0.285, P<0.01). Compared with the low grade,the levels of IL-17 and TGF-pl positive cells were obviously increased in high grade. The Kaplan-Meier analysis showed that there were significant differences in overall survival (OS) between the IL-17 and TGF-pl high-expression and lowexpression group (P＜0.01, P＜0.05). The 3-year OS rates of IL-17 of high expression and low expression were 33.75% and 76. 36%. Multivariate Cox proportional hazards regression analysis indicated that age,KPS score, IL-17 were independent prognostic factor for OS (P＜0.01). Conclusion Intratumoral IL-17-producing cell density and the expression of TGF-β1 was associated with the malignancy of human glioma.     

Influences of Chinese medicinal on TGF-β1 and CTGF secreted by mesangial cells in rats fostered by high glucose combining Ang Ⅱ

目的 探讨益气养阴消癥通络中药对高糖联合血管紧张素Ⅱ( AngⅡ)培养的大鼠肾小球系膜细胞分泌转化生长因子β1(TGF-β1)、结缔组织生长因子(CTGF)的影响,为进一步研究其防治糖尿病肾病(DN)的作用机理提供依据.方法 原代培养肾小球系膜细胞(MCs),实验共分为5组:低糖对照组、高糖组、高糖+ AngⅡ组、中药血清组、厄贝沙坦血清组.于第5代时,予高糖、高糖联合AngⅡ刺激,并同时进行益气养阴消癥通络中药及厄贝沙坦西药血清干预,48 h后ELISA法检测细胞上清TGF-β1、纤维连接蛋白(FN)、层粘连蛋白(LN)的蛋白含量,Western blot检测CTGF蛋白表达水平.结果 与低糖对照组比较,其他组TGF-β1、CTGF、FN、LN表达均明显升高;与高糖+ AngⅡ组比较,厄贝沙坦血清、中药血清组TGF-β1、CTGF、FN、LN表达均明显下降(P＜0.01).结论 益气养阴消癥通络中药可能通过抑制CTGF表达而有效降低TGF-β1的水平,从而抑制细胞外基质的合成,发挥其保护肾脏的作用.     

Combined Use of RGD-peptide Modified PLGA and TGF-β1 Gene Transfected MSCs to Improve Cell Biobehaviors in vitro

In order to improve the surface properties of PLGA polymer for a better material/cell interface to modulate the cells behaviors, we prepared a novel three-block copolymer, PLGA-[ASP-PEG], and immobilized an RGD-containing peptide, Gly-Arg-Gly-Asp-Ser-Pro-Cys （GRGDSPC） on the surface of it. Transforming growth factor-β1 （TGF-β1） was transfected into bone marrow stromal cells （MSCs） employed as seeded cells. Cell adhesion, spreading, proliferation and differentiation on this material were investigated. The results showed that the cell adhesive ratio on RGD-modified materials was higher than on un-modified materials （P〈0.05）. The extent of cell spreading was also wider on RGD-modified materials than on un-modified materials. Cell proliferation indices of transfected MSCs were increased as compared with the un-transfected MSCs （P〈0.05）. The ALP activities in the MSCs cultured with RGD-modified materials were higher than on un-modified materials after 14 days （P〈0.05）, and those in transfected MSCs were higher than in un-transfected MSCs （P〈0.05）. It was suggested that the combined use of RGD-modification and TGF-β gene transfection could improve the interaction of biomaterial and cells.     

Effects of single nucleotide polymorphisms 869 T/C and 915 G/C in the exon 1 locus of transforming growth factor-β1 gene on chronic obstructive pulmonary disease susceptibility in Chinese

Background The main risk factor for chronic obstructive pulmonary disease （COPD） is cigarette smoking. However, only 10%-20% of chronic heavy smokers develop systematic COPD. We hypothesized that the inheritance of gene polymorphisms could influence the development of COPD, which was investigated by studying two single nucleotide polymorphisms （SNP） in exon 1 of the transforming growth factor-β1 （TGF-β1） gene. Methods We enrolled 219 patients with COPD as the research group and 148 healthy people as the control group, all of whom were Chinese Han people. The polymorphisms of the TGF-β1 gene, 869T/C and 915G/C, were analyzed using the method of amplification refractory mutation system-polymerase chain reaction （ARMS-PCR）. Results The occurrence of the TGF-β1 gene 869T/C polymorphism in patients with COPD was significantly different from the control group （P 〈0.05）, in which the relative risk of this disease increased in cases who had the C allele （OR： 1.131, 95% CI： 1.101-1.539）. There was no increased frequency of TGF-β1 915G/C gene in COPD patients compared with control subjects （P 〉0.05）. Conclusions The polymorphism 869T/C in TGF-β1 gene has a significant association with disease occurrence in COPD patients and the C allele might be a risk factor. The homozygous wild-type CC of 869T/C on TGFβ1 could be a predisposing factor in COPD and those who carry the C allele might have particularly susceptibility to developing COPD.