肿瘤坏死因子受体基因单核苷酸多态性与肺炎严重程度的相关性

 目的：比较肿瘤坏死因子受体（tumor necrosis factor receptor, TNFR）基因多个等位基因在肺炎人群中的分布频率,分析基因多态性与肺炎发病率和病情严重程度的相关性。方法：纳入66例肺炎患者与66例既往无肺炎的健康体检者,抽提各研究对象外周血DNA,通过聚合酶链式反应-限制性片段长度多态性或基因测序的方法检测TNFR1+36A/G、TNFR1-609G/T、TNFR2+676T/G、TNFR2 +1663T/G、TNFR2 +1668A/G和TNFR2 +1690C/T各多态性位点在肺炎患者与健康体检者、重症肺炎与非重症肺炎患者中的分布频率,并统计分析各基因分布频率与肺炎发生率和严重程度的相关性。结果：TNFR1-609G与T等位基因在肺炎患者中分布频率分别为40.9%与59.1%,在健康体检者中的分布频率分别为53.8%与46.2%; TNFR1-609T等位基因在肺炎患者中的分布频率较高（P<0.05）。余基因的各等位基因在肺炎患者与健康体检者中的分布频率差异无统计学意义。TNFR1-609G与T等位基因在重症肺炎患者中分布频率分别为25.0%与75.0%,在非重症肺炎患者中的分布频率分别为46.0%与54.0%,T等位基因在重症肺炎患者中的分布频率较高（P<0.05）。TNFR2 +1690C与T等位基因在重症肺炎患者中分布频率分别为81.1%与18.9%,在非重症肺炎患者中的分布频率分别为61.0%与39.0%,C等位基因在重症肺炎患者中分布频率较高（P<0.05）,余基因的各等位基因在重症肺炎与非重症肺炎患者中的分布频率差异无统计学意义。结论：携带TNFR1-609T等位基因的个体更易罹患肺炎,而携带TNFR1-609T及TNFR2 +1690C等位基因的个体肺炎病情较严重,易进展为重症肺炎。     

TNF-α单核苷酸多态性与中国北方汉族人类风湿关节炎的相关性研究

目的:研究肿瘤坏死因子α(TNF-α)基因单核苷酸多态性(SNP)与中国北方汉族人类风湿性关节炎(RA)易感性的相关性。方法:选取98例RA和100例正常对照者作为研究对象,应用Sequenom飞行时间质谱技术,对TNF-α基因的SNP点rs1800629(-308 A/G)、rs361525(-238 A/G)、rs1799724(-850 C/T)和rs1800610(+489 C/T)进行基因分型,用SPSS 11.5软件对数据资料进行统计分析。结果:RA患者TNF-α多态性位点rs1799724、rs1800610和rs361525的基因型频率及等位基因频率与正常对照组比较差异无统计学意义(P>0.05),而TNF-αrs1800629的基因型频率及等位基因频率与正常对照组比较有明显的统计学差异(P<0.05)。TNF-αrs1800629 G等位基因及GG基因型可以提高RA的发病风险性。结论:NF-α基因SNP位点rs1800629可能与北方汉族人RA发病易感性相关。     

中国北方汉族人群HBV携带者和慢性乙肝患者TNF-α基因启动子区单核苷酸多态性分析

目的探讨在中国北方汉族人群中TNF-α基因启动子区单核苷酸多态性（SNPs）及其单倍型是否与HBV感染结局相关联。方法以212例无症状HBV携带者和207例慢性乙肝患者为研究对象,应用聚合酶链反应-限制性片段长度多态性（PCR-RFLP）和序列特异性引物-PCR（SSP-PCR）方法对TNF-α基因启动子区5个位点,进行基因分型,用EPI和EH等软件分析各位点等位基因、基因型、单倍型频率及其组间差异。结果TNF-α基因-238GG基因型和-863CC基因型是HBV感染后个体发生乙型肝炎慢性化的易感因素（P=0．05,P〈0．01）。5个位点组成的单倍型GGCCT在慢性肝炎组的频率显著低于无症状携带组（P〈0．05）,单倍型GGCAT和GGTAT在慢性肝炎组的频率显著高于无症状携带组（P〈0．05）。结论TNF-α基因启动子区多态性可能是影响HBV感染结局的重要宿主遗传因素之一。     

贵州三个主要民族人群TNF-α基因启动子区单核苷酸多态性分析

目的：了解贵州汉族、苗族、布依族人群肿瘤坏死因子α（Tumour necrosis factor alpha,TNF-α）基因启动子区的基因多态性。方法：采用聚合酶链反应-限制性片段长度多态性（PCR-RFLP）和序列特异性引物-聚合酶链反应（SSP-PCR）方法,对贵州汉族、苗族、布依族人群中TNF-α基因启动子区已知的5个多态性位点进行基因分型检测,并用统计学方法分析各位点基因型、等位基因频率和单倍型及其组间差异。结果：贵州汉族人群中TNF-α基因启动子区5个位点的等位基因频率分别为-238（G,96%;A,4.0%）、-308（G,92%;A,8%）、-857（C,65.0%;T,35.0%）、-863（C,80.0%;A,20.0%）、-1031（T,48.0%;C,52.0%）,其单倍型以GG-GG-CC-CC-TC和GG-GG-TT-CC-TC为主,分别占32.0%和28.0%;苗族人群中TNF-α基因启动子区5个位点的等位基因频率分别为-238（G,85.0%;A,15.0%）、-308（G,94.0%;A,6.0%）、-857（C,74.0%;T,26.0%）、-863（C,96.0%;A,4.0%）、-1031（T,50.0%;C,50.0%）,其单倍型以GG-GG-CC-CC-TC和GG-GG-TT-CC-TC为主,分别占50.0%和24.0%;布依族人群中TNF-α基因启动子区5个位点的等位基因频率分别为-238（G,86.0%;A,14.0%）、-308（G,92.0%;A,8.0%）、-857（C,89.0%;T,11.0%）、-863（C,84.0%;A,16.0%）、-1031（T,50.0%;C,50.0%）,其单倍型以GG-GG-CC-CC-TC占54.0%,AA-GG-CC-CC-TC和GG-GG-CC-AA-TC各占12%。结论：贵州汉族、苗族、布依族人群中TNF-α基因启动子区单核苷酸多态性具有独特的特征,这为TNF-α基因多态性与疾病的相关性研究提供了基础资料。     

TNF-α基因多态性在中国人群中的分布及其与冠心病相关性的研究进展

除单核巨噬细胞可以分泌肿瘤坏死因子α（TNF-α）外,心肌细胞也可以合成并分泌TNF—α,当心肌缺血时可诱导心肌细胞表达TNF—α增强。TNF-α可以直接或间接损伤血管内皮细胞,产生促炎症、促凝血、抗纤溶反应,提示其参与冠心病的发生发展过程。TNF-α基因启动子区的多态性位点影响TNF—α基因的表达,TNF—α基因在不同种族和不同地区人群间的多态性分布使冠心病在不同种族、不同地区间具有不同的发病率和临床特点。     

中国汉族人群中TNF-α基因多态性与血脂关系的研究

目的研究肿瘤坏死因子-α(TNF-α)基因多态性与健康人群血脂谱改变的关系.方法随机选择182例湖北地区无血缘关系健康汉族人群,用聚合酶链反应限制性片段长度多态性(PCR-RFLP)技术检测其TNF-α基因多态性,分析各基因型对血脂、脂蛋白、栽脂蛋白的影响.结果TNF-α-238位点基因型在中国正常人群中的分布仅与日本人群中的分布较为接近,TNF-α-863位点基因型的分布与日本人、高加索人中的分布差异无显著性.结论在汉族人群中存在TNF-α基因多态性,且与血脂水平无相关性(P＞0.05).     

TNF-α基因多态性与妊娠高血压的相关性研究

目的　探讨肿瘤坏死因子-α(tum or necrosis factor- alpha,TNF-α)基因启动子- 30 8G>A、- 85 0 C>T多态性与妊娠期高血压疾病的相关性。方法　应用聚合酶链反应-限制性片段长度多态性技术检测10 6例患者和10 8名健康孕妇的TNF- α基因启动子- 30 8G>A、- 85 0 C>T多态性。对两组之间的基因型频率和等位基因频率进行比较。结果　TNF-α基因启动子- 30 8位点TNF2等位基因频率和TNF2 / 1基因型频率在病例组明显升高(P<0 .0 5 )。- 85 0位点T等位基因频率和CT+TT基因型频率在对照组明显升高,差异有统计学意义(P<0 .0 5 )。由这两个多态性位点组成的不同基因型中,病例组TNF2 / 1CC基因型频率明显高于对照组,差异有统计学意义(P<0 .0 5 ) ,而TNF1/ 1TT基因型频率在对照组明显增高,差异有统计学意义(P<0 .0 5 )。结论　TNF- α- 30 8、- 85 0位点多态性与妊娠期高血压疾病相关,其中TNF- α基因- 30 8位点的突变是危险因素,- 85 0位点的突变可能是保护性因素。TNF2 / 1CC基因型可能是妊娠期高血压疾病的易感基因型。     

肿瘤坏死因子α-308基因多态性与牙周病相关性

目的探讨肿瘤坏死因子-α308位点基因多态性与牙周炎易感性的关系。方法采用序列特异引物PCR方法 （SSP-PCR）方法检测了78例重度慢性牙周炎（CP）患者和70例健康对照组的TNFα-308（G/A）位点基因多态性。结果 CP患者TNFα-308各基因型（GG,GA,AA）频率分别为70.5%、0%和29.5%,在对照者中分别为67%,3%和30%二组之间的基因型频率分布的比较,差异没有显著性（χ2=2.29,P〉0.05）;GG和AA的等位基因频率在CP中分别85.3%和14.7%,在对照者中分别为82%和18%,二者之间比较,差异没有显著性（χ2=0.526,P〉0.05）。结论 TNF-α-308基因多态性位点可能不是中国人患牙周病的主要易感位点基因。     

内蒙古包头地区汉族人群TNF-α-308位点基因多态性与IgA肾病的相关性研究

目的：了解内蒙古包头地区汉族人群IgA肾病患者肿瘤坏死因子α（TNF-α）-308位点基因型的分布特点。方法：应用聚合酶链反应-限制性片段长度多态性（PCR-RFLP）技术检测97例IgA肾病患者和73例正常人的TNF-α基因型。结果：IgA肾病患者组中TNF-α基因G/A多态GG、GA、AA基因型频率分别为85.6%、11.3%和3.1%,其中G和A等位基因频率分别为91.2%和8.8%。正常对照组中,TNF-α基因G/A多态GG、GA、AA基因型频率分别为91.8%、5.5%和2.7%,其中G和A等位基因频率分别为94.5%和5.5%。IgA肾病患者组与正常对照组比较,基因型频率差异有显著性（χ^2=27.2,P〈0.05）,等位基因频率之间差异无显著性（χ^2=0.659,P〉0.05）。结论：TNF-α-308位点基因多态性与内蒙古包头地区汉族人群IgA肾病的发病有相关性,等位基因频率之间差异无显著性（χ^2=0.659,P〉0.05）。     

Association of tumor necrosis factor-alpha and interleukin-10 gene polymorphisms in Iranian patients with pre-eclampsia

PROBLEM: Considering that certain cytokines may change during pre-eclampsia (PE), because of functional polymorphisms in their genes, our purpose was to determine the association between tumor necrosis factor-alpha (TNF-alpha) and interleukin-10 (IL-10) gene polymorphisms and development of PE. METHOD OF STUDY: The genetic polymorphisms of TNF-alpha and IL-10 was studied by polymerase chain reaction-sequence specific primers in the DNA of peripheral blood cell from 160 patients with PE and 100 healthy pregnant women. RESULTS: We found a significant difference between TNF-alpha A allele (-308) and G allele (-238) in PE patients compared with those of the control groups. A significantly higher C/C genotype frequency of IL-10 (-592 and -819) was observed in the PE patients than in the control groups. In addition, the frequencies of three common IL-10 haplotypes (GCC, ACC, and ATA) did not show any significant difference between the study groups. CONCLUSION: These findings would support the concept of contribution of TNF-alpha and IL-10 gene polymorphisms in the pathogenesis of PE in our population.     

Association of tumor necrosis factor-{alpha} gene polymorphisms with advanced stage endometriosis

BACKGROUND: This study was performed to investigate whether specific haplotypesand several single nucleotide polymorphisms in the promoterregion of the tumor necrosis factor (TNF)- gene are associatedwith the risk of advanced stage endometriosis in a Korean population. METHODS: This study comprised women with (n = 246) or without (n = 248)endometriosis. The TNF:g.[-1031T > C], TNF:g.[-863C >A] and TNF:g.[-857C > T] polymorphism in the TNF- gene wereassessed by PCR-restriction fragment length polymorphism analysis,which utilized digestion by BbsI, HypCH4IV and HypCH4IV restrictionenzymes, respectively. In silico haplotypes were deduced byusing the Haploview version 3.32. RESULTS: The genotype distribution of TNF:g.[-1031T > C] was significantlydifferent between total endometriosis patients and the controls(T/T of 56.9 versus 60.1%, T/C of 35.4 versus 37.5% and C/Cof 7.7 versus 2.4%, respectively, P = 0.027). This differenceat the TNF:g.[-1031T > C] tends to increase in Stage IV endometriosis(P = 0.01). However, there was no difference in the TNF:g.[-863C> A] and TNF:g.[-857C > T] site between the two groups.Even when the endometriosis cases were subdivided into AmericanSociety for Reproductive Medicine Stages III and IV, genotypedifferences were not found. The CC homozygote at TNF:g.-863was more frequently found in the controls than Non-CC group(P = 0.04; odds ratio = 0.67; 95% confidence interval = 0.45–0.98).All haplotypes and diplotypes, deduced by in silico analysis,showed no association with subgroups or controls. CONCLUSIONS: Our results suggest that the genotype frequencies at the TNF:g.[-1031T> C] and the TNF:g.[-863C > A] sites may be associatedwith advanced stage endometriosis in the Korean population.     

Tumour necrosis factor-alpha gene haplotype is associated with pre-eclampsia

We determined whether polymorphisms in the promoter region of the tumour necrosis factor alpha (TNF-alpha) gene contributes to differences in susceptibility to develop pre-eclampsia. The study involved 133 pre-eclamptic and 115 healthy pregnant women who were genotyped for the G-308A polymorphism of the TNF-alpha gene. The frequency of the G-308A allele was more common in the pre-eclampsia group than among the controls (P=0.046), giving an odds ratio of 0.57 (95% CI: 0.32-0.99), but there were no differences in the genotype distribution. The data from the G-308A polymorphism was combined with the previously published genotype and allele data from the C-850T polymorphism of the TNF-alpha gene, and used to assess a haplotype estimation analysis. Estimated overall pair of loci haplotype frequencies differed significantly between the groups (P=0.023+/-0.004). In the single haplotype association analysis, the haplotype C-A versus others was over-represented in the pre-eclampsia group (P=0.041+/-0.003), whereas the haplotype T-G versus others was less common in the pre-eclampsia group (P=0.035+/-0.003), compared with the controls. In conclusion, the polymorphisms of the TNF-alpha gene showed a significant haplotype association with susceptibility to pre-eclampsia in the Finnish population.     

Tumor necrosis factor-alpha single nucleotide polymorphisms in juvenile systemic lupus erythematosus

BackgroundJuvenile systemic lupus erythematosus (JSLE) is a multi-system autoimmune disorder of unknown origin. Given the importance of the contribution of pro-inflammatory cytokines, including tumor necrosis factor-alpha (TNF-α), towards the pathogenesis of JSLE, this study was performed to assess TNFA gene polymorphisms in a case-control study.MethodsFifty nine patients with JSLE were enrolled in this study as case group and compared with healthy control subjects. The frequency of alleles, genotypes, and haplotypes of TNFA single-nucleotide polymorphisms (SNPs) at positions −308 and −238 were evaluated, using polymerase chain reaction with sequence-specific primers method.ResultsThe G allele at position −238 in TNFA promoter region was significantly more frequent in patients with JSLE than in the healthy controls (P value < 0.001), while the frequency of A allele at the same position was significantly lower than controls. Furthermore, a significant positive association for G/G genotype at the same position was detected in patients’ group compared with control subjects (P value < 0.001). The GA haplotype of TNFA (positions −308, −238) was significantly less frequent in case group than in controls (P value < 0.001), while GG was the most frequent haplotype for TNFA in the patient group, compared to controls (P value < 0.01).ConclusionsPro-inflammatory cytokine gene polymorphisms may influence susceptibility to JSLE. Particular TNFA gene variants are associated with JSLE and could be used as a genetic marker for susceptibility to JSLE.     

类风湿关节炎患者血清sTNF—R、TNF—α的变化

目的为探讨类风湿关节炎 (RA)与可溶性肿瘤坏死因子受体 (s TNF- R)、TNF- α、TNF- α/ s TNF- R比值的关系。方法应用双抗体夹心 EL ISA法检测了活动期 RA(2 8例 ) ,稳定期 RA (12例 )及健康人 (30例 )血清中 s TNF- R 、s TNF- R 、TNF-α的水平。结果活动期 RA患者血清 s TNF- R 、s TNF- R 、TNF-α水平明显高于健康人及稳定期 RA组 ,P均 <0 .0 1。稳定期 RA患者血清 s TNF- R 、s TNF- R 、TNF-α水平亦明显高于健康人 ,P<0 .0 1。在 RA患者中 ,血清 s TNF- R 、s TNF- R 水平与 ESR、CRP、Ritchie index呈显著正相关 ,与类风湿因子 (RF)水平无相关性。RA患者治疗 3个月后 s TNF- R 、s TNF- R 及 TNF- α/ s TNF R比值显著下降。结论 RA患者血清 s TNF- R 、s TNFR- 水平显著增高 ,且与疾病活动度呈正相关。测定血清 s TNF- R 、s TNF- R 、TNF- α/ s TNF- R水平可作为 RA诊断 ,监测疾病活动、治疗及判断预后的一项有意义的实验室指标     

Lymphotoxin and tumor necrosis factor-alpha production by myelin basic protein-specific T cell clones correlates with encephalitogenicity.

Lymphokine activity in seven myelin basic protein (MBP)-specific T cell clones was examined. All of the clones recognize MBP peptide 1-9 in the context of I-Au. A strong positive correlation was found between levels of lymphotoxin (LT) and tumor necrosis factor alpha (TNF-alpha) mRNA and biological activity on L929 cells and their capacity to induce paralysis, the clinical hallmark of experimental allergic encephalomyelitis (EAE). No correlation was found between interleukin-2 or gamma interferon production and encephalitogenicity. LT and/or TNF-alpha may play a central role in the pathogenesis of EAE.     

NYGGF4基因在人前体脂肪细胞分化过程中的表达及肿瘤坏死因子α对其调控的研究

目的 观察人前体脂肪细胞诱导分化过程中NYGGF4基因mRNA表达水平的变化,探讨重组肿瘤坏死因子α(tumor necrosis factor α,TNFα)对成熟脂肪细胞中NYGGF4基因表达水平的调节作用.方法 体外培养人内脏来源的原代前体脂肪细胞(human preadipocytes-visceral,HPA-v),在诱导HPA-v分化成熟的基础上,应用不同浓度重组TNFα干预成熟脂肪细胞16 h,或以10 ng/mL TNFα分别干预不同时间,采用实时荧光定量逆转录PCR技术检测的NYGGF4 mRNA表达水平.结果 (1)HPA-v诱导分化至第17 d,具备成熟脂肪细胞特征;(2)NYGGF4基因低表达于人前体脂肪细胞中,随脂肪细胞分化成熟其表达水平逐渐升高;(3)随TNFα干预浓度增高及干预时间延长,人成熟脂肪细胞中NYGGF4mRNA水平呈现逐渐升高的趋势.结论 NYGGF4基因具随脂肪细胞分化成熟表达逐渐上调的特征,TNFα能显著上调成熟脂肪细胞中NYGGF4基因的表达,其效应具有剂量依赖和时间反应性.     

Allograft inflammatory factor-1 and tumor necrosis factor single nucleotide polymorphisms in systemic sclerosis

Tumor necrosis factor (TNF) alleles have been associated with systemic sclerosis (SSc); however, these alleles may be in linkage with other genes. Allograft inflammatory factor-1 (AIF-1) is a newly identified gene on the short arm of chromosome 6 in the class III region of the human leukocyte antigen. It appears to be involved in inflammation and was originally identified in rat cardiac allografts undergoing rejection. AIF-1 has several sequence variations (single nucleotide polymorphisms, SNPs), three of which result in nonsynonymous changes in amino acid coding. We analyzed the linkage of five TNFA and five AIF-1 SNPs by polymerase chain reaction in 239 Caucasian individuals. The TNFA-1031T/T genotype was found to be associated with SSc (P < 0.0001) and both the DcSSc (diffuse subset of SSc) and the LcSSc (limited subset of SSc) subsets (P= 0.0004 and P= 0.0009, respectively) and the TNFA-237G/G genotype was found to be associated with all SSc (P= 0.0003) and with the DcSSc and LcSSc subsets (P= 0.01 and P= 0.005, respectively). Furthermore, the TNFA-857C/T genotype was associated with LcSSc (P= 0.0003) and TNFA-307A/A genotype associated with DcSSc (P= 0.028). In AIF-1, RS2269475 exon 4A allele, which generates a nonsynonymous change (tryptophan to arginine), was significantly associated in patients with SSc (P= 0.0009) and was associated with those patients who had DcSSc (P= 0.002). A strong linkage disequilibrium was observed between the AIF-1 alleles, A allele of RS2269475 and the A allele of RS4711274 (P < 0.0001), and linkage was observed between AIF-1 and TNFA alleles. Here, we report a novel and significant association of a nonsynonymous change within the AIF-1 with SSc and identified the linkage with TNFA alleles within 50 kb of this gene. Our study lends support that TNFA may be an important inflammatory modulator in SSc and may play a significant role with AIF-1 in disease pathogenesis.     

Polymorphisms of tumor necrosis factor-alpha are associated with increased susceptibility to gastric cancer: a meta-analysis

We conducted a meta-analysis to assess the association between tumor necrosis factor-alpha (TNF-alpha) gene TNFA-308 (G > A) and TNFA-857 (C > T) polymorphisms and gastric cancer (GC) susceptibility. We also performed subgroup analyses based on ethnicity (Caucasian, east Asian, and other populations) and tumor location [noncardia gastric cancer (NCGC)]. There were 3,335 GC patients and 5,286 controls for TNFA-308, and 1,118 GC patients and 1,591 controls for TNFA-857 in our analysis. Overall, allele contrast (A vs. G) of TNFA-308 polymorphism produced significant results in worldwide populations [Pheterogeneity = 0.05, random-effects (RE) odds ratio (OR) 1.19; 95% confidence interval (CI) 1.03-1.37, P = 0.02] and Caucasian populations (Pheterogeneity = 0.15, fixed-effects (FE), OR 1.27; 95% CI 1.11-1.45, P = 0.0005). Similar results were also obtained in recessive models and homozygote contrasts. No significant association was observed in NCGC and east Asian subgroup analysis. T variant of TNFA-857 produced significant results only in allele contrast (Pheterogeneity = 0.38, FE OR 1.17; 95% CI 1.01-1.35, P = 0.04). In conclusion, TNFA-308 locus of TNF-alpha would be a risk factor for GC, especially in Caucasian populations. Besides, TNFA-857 locus may be related to GC risk, which demonstrated changeability of results in different contrasts.