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）。     

肿瘤坏死因子-α脑脊液水平及其多态性与多发性硬化的相关性

目的研究中国南方汉族人群中脑脊液肿瘤坏死因子-α水平及其G-308A位点基因多态性与多发性硬化之间的相关性。方法采用双抗体夹心ABC-ELISA法测定68名无亲缘关系的急性发作期MS病人和55例非免疫系统疾病人的CSF(对照)TNF-α,同时应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术检测上述68例MS病人和106名无血缘关系的广东籍健康汉族人的TNF-α基因型。结果发作期MS患者CSF中TNF-α水平与正常对照组,无显著差异(P>0.05),分别是265±78pg/m l和245±83pg/m l;TNF-α各等位基因型频率在MS组和正常人组比较无显著差异(P均>0.05),病例组TNF-α基因A纯合基因型和A等位基因频率(分别为4.4%和13.9%),正常对照组(分别为0%和8.5%)。结论1.CSF中TNF-α水平与发作期MS患者无相关。2.中国南方汉族人群存在TNF-α基因G-308A位点突变。3.从目前调查的例数中,中国南方汉族人群TNF-α基因G-308A多态性与广东人群中MS及CSF中TNF-α水平无关。     

足月前胎膜早破患者肿瘤坏死因子α基因多态性及羊水中表达分析

目的探讨肿瘤坏死因子-α(TNF-α)基因启动子区-308位点单核苷多态性(single nucleotide polymorphism,SNP)及其羊水中TNF-α水平与足月前胎膜早破(PPROM)发病的关系。方法收集100名PPROM患者、150名正常足月分娩患者外周血,提取基因组DNA,进而采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)分析方法检测TNF-α基因-308位点SNP的基因型。其中71例PPROM和50例正常足月分娩患者同时收集到羊水样本。采用双抗体夹心酶联免疫吸附试验(ELISA)方法检测羊水中TNF-α浓度;结果 1.研究结果显示:PPROM组与正常对照组比较:TNF-α-308位点TNF-α基因启动子区-308位点GG/GA+AA基因型分布及G/A等位基因频率均存在显著性差异,(均P0.05)。2.PPROM组羊水中TNF-α浓度为104.25±8.71明显高于正常对照组(70.18±9.03),两组TNF-α浓度有统计学差异(P=0.000)。3.A等位基因携带(即G/A+A/A基因型携带者)TNF-α浓度为105.42±7.76明显高于G/G基因型携带者(69.21±8.87),两者比较有显著性差异(P=0.000)。结论 1.羊水中TNF-α浓度明显升高是胎膜早破发病的重要机制中之一;2.TNF-α-308位点SNP与TNF-α的表达有关,携带-308A等位基因可使羊水中TNF-α高表达,是PPROM患病的易感基因。     

肿瘤坏死因子-α基因启动子多态性与慢性乙型肝炎易感性的关系

目的探讨湖北汉族人肿瘤坏死因子-α(TNF-α)基因启动子多态性及其与慢性乙型肝炎易感性之间的关系。方法应用聚合酶链反应-限制性片段长度多态性分析方法(RFLP),检测126名正常对照者和131例慢性乙型肝炎患者TNF-α基因启动子多态性。结果共发现12种启动子基因型,以GG.GG.CC.CC、GG.GG.CC.CA、GG.GG.CT.CC和GG.GA.CC.CC基因型多见,约占85%;通过对TNF-α基因启动子4个位点基因型分析发现,慢性乙型肝炎患者和正常对照者TNF-α基因启动子-238G/A、-857C/T位点基因型分布频率差异无显著性,而-308G/A、-863C/A位点基因型分布频率差异有显著性。结论湖北汉族人慢性乙型肝炎易感性与TNF-α基因启动子-308G/A、-863C/A位点多态性有关,其中TNF-α-308GA、-863CA基因型携带者患慢性乙型肝炎风险相对较小。     

肥胖2型糖尿病患者TNF-αG-308A基因多态性与肾病相关性研究

为探讨肿瘤坏死因子-α(TNF-α)G-308A基因多态性与肥胖2型糖尿病患者肾病的关系.对香港新界地区388例2型糖尿病合并肾病患者及323例2型糖尿病无肾病患者,应用聚合酶链式反应-限制性片段长度多态性(PCR-RFLP)方法检测TNF-αG-308A的基因多态性,以病例-对照方法研究其与肥胖2型糖尿病患者发生肾病的相关性.结果表明:(1)在肥胖与非肥胖者以及合并糖尿病肾病和无肾病患者之间,TNF-α G-308A多态性的基因型和等位基因频率无显著性差异;(2)GG和GA/AA基因型携带者之间,体重指数和尿白蛋白/肌苷比(ACR)水平无显著性差异;(3)在GG基因型携带者中,肥胖者的ACR和血肌苷水平显著高于非肥胖者(P＜0.005);而在GA/AA基因型携带者中,肥胖与非肥胖者间无显著性差异(P＞0.05);(4)多元逻辑回归分析显示,肥胖的GG基因型携带者患糖尿病肾病的危险性比非肥胖的GA/AA基因型携带者增加2.4倍(95%CI:1.3～4.5,P＝0.007).因此,在2型糖尿病患者中,肥胖的GG基因型携带者糖尿病肾病的患病风险增大.     

妊娠期糖尿病患者肿瘤坏死因子-α基因多态性的实验性研究

目的研究东北汉族妊娠期糖尿病(GDM)孕妇肿瘤坏死因子-α(TNF-α)基因多态性的分布频率及在GDM发病中的作用.方法选取120例GDM作为病例组,120例糖耐量正常的孕妇作为对照组,采用双抗体夹心酶联免疫吸附试验(ELISA)检测血清TNF-α水平,以稳态模型Homa model公式评估胰岛素抵抗(IR),同时应用聚合酶链式反应-限制性片段长度多态性(PCR-RFLP)技术,检测TNF-α基因-308和-238位点等位基因和基因型的分布频率.结果⑴ GDM组及对照组的血清TNF-α水平分别为(10.29±2.44) μg/L 和(5.21±1.01) μg/L (P＜0.05);FINS分别为(24.34±12.84 ) mIU/L 和(17.88±7.31 ) mIU/L(P＜0.01);HOMA-IR分别为(2.74±1.06) 和(1.35±0.69) (P＜0.01).⑵GDM组-238多态性位点A等位基因频率(0.0583和0.0417)及GA AA基因型频率(0.1083和0.0917)均高于正常妊娠对照组,但差异无统计学意义(P＞0.05).GDM组-308多态性位点A等位基因频率(0.1375和0.0583)及GA AA基因型频率(0.2417和0.1167)显著高于正常妊娠对照组,差异有统计学意义(P＜0.05).⑶GDM组GA AA基因组及GG基因型组TNF-α分别为[(6.35±1.43) μg/L]和[(5.68±0.45) μg/L] (P＜0.05);FINS分别为(13.42±4.73) mIU/L和(10.40±3.63) mIU/L(P＜0.01);HOMA-IR分别为(7.42±1.93)和(4.11±1.31)(P＜0.01).结论我国东北汉族孕妇人群中,TNF-α基因 308G→A变异可增加孕妇患妊娠期糖尿病的危险性.A等位基因可能通过增加TNF-α的释放参与胰岛素抵抗,导致GDM的发病.     

湖南地区强直性脊柱炎患者中TNF-α-238位点的多态性研究

目的:通过分析湖南地区强直性脊柱炎汉族患者DNA中TNF-α-238位点的多态性,研究湖南地区汉族人群中TNF-α-238位点基因多态性与强直性脊柱炎发病的相关性.方法:应用聚合酶链反应-限制性片段长度多态性法( PCR-RFLP)对患者和正常人DNA中TNF-α-238位点进行基因分型检测,采用酶联免疫吸附法(ELISA)检测100例强直性脊柱炎患者和90例正常人血清中TNF-α的水平,HLA-B27分型采用流式细胞仪检测.用统计学方法分析两组中基因型、等位基因频率、TNF-α水平、HLA-B27阳性率及其组间差异.结果:100例患者中TNF-α-238位点G/G基因型95例(95%),G/A基因型5例(5%),90例正常人中TNF-α-238位点G/G基因型88例(97.8%),G/A基因型2例(2.2%).AS组的TNF-α-238位点G频率(97.5%)低于正常对照组(98.9%),A频率(2.5%)高于对照组(1.1%);两组均未发现A/A基因型;AS组患者血清中TNF-α的平均水平比正常人明显增高[(10.16±1.19) pg/ml vs.(5.64±1.18) pg/ml],且G/A基因型患者血清中TNF-α的平均水平比G/G基因型患者高[(13.49±1.27) pg/ml vs.(9.44±1.29 pg/ml)];HLA-B27阳性率在湖南地区AS组和正常对照组中的分布差异极其显著(χ~2=114.975,P=0.000).对 HLA-B27和TNF-α-238两位点的基因分析表明,与单独HLA-B27阳性比较,TNF-α-238位点基因型为G/G时比数比(OR值)明显增加.结论:湖南地区汉族人群中TNF-α-238位点多态性与强直性脊柱炎发病可能没有相关性,但基因型为G/G时AS的患病风险可能增高.     

再生障碍性贫血TNF-α基因多态性和蛋白表达水平的相关研究

目的探讨北方地区汉族人肿瘤坏死因子-α(TNF-α)基因型别的多态性和TNF-α蛋白表达与再生障碍性贫血(AA)的相关性。方法对36例AA患者采用酶联免疫分析法(ELISA)测定TNF-α含量,应用顺序特异性引物聚合酶链反应(PCR-SSP)方法检测TNF-α基因型别的多态性变化,并与31名健康献血者对照。结果AA组血中TNF-α蛋白含量(1.960±0.103)显著高于对照组(1.17±0.075),P<0.01;AA组TNF-α(308A)等位基因频率(40.12%)显著高于对照组(9.68%),P<0.01,提示该等位基因频率和血中TNF-α蛋白表达增高与AA相关。结论中国北方地区汉族人TNF-α基因308位点的多易感态性和TNF-α蛋白表达与AA的易感性相关联,TNF-α(308A)等位基因可能是AA的易感基因之一。     

急性早幼粒细胞白血病TNF-α基因多态性和蛋白表达水平的相关研究

目的 探讨北方地区汉族人肿瘤坏死因子-α(TNF-α)基因型别的多态性和TNF-α蛋白表达与急性早幼粒细胞白血病(APL)的相关性.方法 对21例APL患者采用酶联免疫分析法(ELISA)测定TNF-α含量,应用顺序特异性引物聚合酶链反应(PCR-SSP)方法检测TNF-α基因型别的多态性变化,并与31名健康献血者对照.结果 APL组血中TNF-α蛋白含量(1.810±0.116)显著高于对照组(1.107±0.095),P＜0.05;APL组和正常对照组TNF-α(308A)等位基因频率分别是(9.524%)和(9.68%)组间差异无统计学意义(P＞0.05),提示该等位基因频率与APL不相关,血中TNF-α蛋白表达增高与APL相关.结论 中国北方地区汉族人TNF-α基因308位点基因多态性与APL的易感性、临床以及预后可能不起重要作用;而TNF-α蛋白表达与APL的易感性相关联.     

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。     

阿茨海默氏病与肿瘤坏死因子水平及肿瘤坏死因子TNF-α-308G／A基因多态性的关系

目的探讨肿瘤坏死因子A-308基因多态性与阿茨海默氏病的关系。方法用放免法测定TNF水平，运用多聚酶链反应技术检测66例阿茨海默氏病及143例正常人肿瘤坏死因子A-308基因多态性。结果AD组肿瘤坏死因子A-308TNF-α1／1、TNF-α1／2、TNF-α2／2表型频率分别为0．8636、0．1212、0．0152。对照组分别为0．8881、0．1049、0．070；AD组TNF-α1、TNF-α2基因频率分别为0．9242、0．0758；对照组分别为0．9021、0．0979。肿瘤坏死因子A-308各种基因型频率在患者组与正常对照组之间的差异无显著性（P〉0.05），而血浆中TNF水平。阿茨海默氏病组明显高于对照组，两组之间比较差异有统计学意义（P〈0．05）。结论血清TNF水平显著升高．提示炎性反应在Alzheimer病程中有重要作用，肿瘤坏死因子A-308基因多态性与AD无明显相关。     

TNF-α-308 promoter G/A and PTPN22 (1858 C/T) genes polymorphisms in Egyptian patients with systemic lupus erythematosus

Tumor necrosis factor alpha (TNF-α) promoter gene polymorphism at position 308 and that of the protein tyrosine phosphatase nonreceptor type 22 (PTPN22) at position 1858 C/T have been inconsistently implicated as genetic risk factors for systemic lupus erythematosus (SLE) in some populations. We investigated the possible association of these polymorphisms with SLE susceptibility, and whether serum TNF-α level is related to different genotypes and disease activity in Egyptian SLE patients. TNF-α-308 G/A and PTPN22 C1858T polymorphisms were determined by PCR-restriction fragment length polymorphism analysis in 40 SLE patients and 40 unrelated healthy controls. Serum TNF-α level was measured by ELISA method. The median serum TNF-α was significantly higher in SLE patients than in controls (P?<?0.001). A significant positive correlation was detected between serum TNF-α and SLE activity index (r?=?0.723, P?<?0.001). There was no significant difference in TNF-α-308 G/A genotypes or allele frequency between SLE cases and controls (P?=?0.108 and P?=?0.133, respectively). Diabetes was the only clinical feature in SLE patients that showed significant higher frequency with GA genotype than with GG genotype (P?=?0.001). Risk estimation for the TNF-α-308 genotypes was of no significant (odds ratio?=?2.429; 95 % CI?=?0.8–7.2; P?=?0.108). Concerning PTPN22 1858 C/T, there was no significant difference in PTPN22 C/T genotypes or allele frequency between SLE cases and controls (P?=?0.152 and P?=?0.155, respectively). TNF-α-308 G/A and PTPN22 (1858 C/T) polymorphisms do not exhibit a significant influence on the susceptibility of SLE in Egyptian patients. However, serum TNF-α level could be a sensitive marker of SLE disease activity.     

Impact of single nucleotide polymorphism in tumor necrosis factor-α gene 308G/A in Egyptian asthmatic children and wheezing infants

Bronchial asthma is a common disease with multiple determinants that include genetic variation. Although tumor necrosis factor alpha (TNF-α) is a major pro-inflammatory cytokine, the functions of genetic polymorphisms in this cytokine has not been thoroughly examined in the context of asthma pathology. Therefore, we aimed to investigate whether single nucleotide polymorphism (SNP) in TNF-α is associated with asthma and wheezing and whether the association is related to the severity of the disease and other epidemiological factors. Frequencies of TNF-α-308G/A polymorphism were compared in 100 asthmatic children, 100 wheezy infants and 100 age and gender matched controls. Genotype frequencies for TNF-α-308G/A were significantly higher in asthmatic children (60%) and wheezy infants (68%) than the control group (30%). Higher serum levels of TNF-α were observed in genotypes G/A and G/G of asthmatic children and wheezy infants than in controls. No association was found between the G/A polymorphism and the severity of the disease, the total eosinophil count and IgE levels in both groups. We can conclude that genetic variation in TNF-α-308G/A may contribute to childhood asthma and wheezing. These findings could be helpful for future early intervention studies which may have a potential impact on family counseling and management.     

Association of tumour necrosis factor-alpha -308 G/A promoter polymorphism with susceptibility and disease profile of rheumatoid arthritis

The objective was to analyze the possible involvement of tumour necrosis factor-alpha (TNF-α) -308 G/A promoter polymorphism in the susceptibility and/or the disease profile of rheumatoid arthritis (RA) in Egyptian patients. TNF-α-308 G/promoter polymorphism detection by amplification refractory mutation system (ARMS) technique was carried out for 122 RA patients and 120 healthy controls. TNF-α-308 G allele/GG homozygous genotype were higher in patients with rheumatoid arthritis than those in control group (P < 0.001, respectively). A statistically significant association was found between the frequency of the A allele and presence of erosion (OR = 3.42, P = 0.015). No associations were found between the distribution of TNF-α-308 G/A alleles/genotypes and age of patients, disease duration, absence of remission, presence of deformity, clinical manifestations of the disease and presence or absence of rheumatoid factor. The positivity of rheumatoid factor was associated with occurrence of erosion (OR = 25.0, P < 0.001). The results of this study demonstrate the association of the TNF-α-308 G allele and GG homozygous genotype with susceptibility to RA and the A allele with the presence of erosion in the Egyptian patients.     

动脉硬化性脑梗死与肿瘤坏死因子α-238及肿瘤坏死因子α-308基因多态性的关系

目的 探讨肿瘤坏死因子(TNF)α-238及TNFα-308基因多态性与动脉硬化性脑梗死的关系.方法 运用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术检测97例动脉硬化性脑梗死(CI组)及141例正常人(对照组)的外周血TNFα-238、TNFα-308基因多态性AA、AG、GG的基因型.结果 CI组TNFα-238 GG、GA和AA基因型频率分别为88.66%、11.34%和0;对照组分别为95.74%、4.26%和0.CI组TNFα-238 G、TNFα-238 A基因频率分别为94.33%、5.67%;对照组分别为97.87%、2.13%.TNFα-238各种基因型频率在CI组与正常对照组之间的差异有统计学意义(均为P<0.05).CI组TNFα-308 GG、GA和AA基因型频率分别为77.32%、8.25%和14.43%;对照组分别为92.20%、5.67%和2.13%.CI组TNFα-308 G、TNFα-308 A基因频率分别为81.44%、18.56%;对照组分别为95.04%、4.96%.TNFα-308各种基因型频率在CI组与正常对照组之间的差异有统计学意义(均为P<0.05).结论 TNFα-238和TNFα-308基因多态性AA、AG、GG基因型与CI有关联.     

The influence of upstream IL-2 -330 (T/G) and TNF-α -308 (A/G) polymorphisms on glutamine-supplemented cytokine release

Various studies have shown that dietary glutamine can modify the course of an immune response, through altering the release of cytokines. Nutritional supplementation of glutamine may therefore be of advantage to patients, particularly those with compromised immunity. Given that polymorphisms in cytokine genes can also affect cytokine levels, we have undertaken a study to identify whether there was a differential effect of glutamine supplementation in the context of different IL-2 -330 (T/G) and TNF-α -308 (A/G) genotypes. Overall, there was no significant impact of glutamine supplementation on IL2 release. However, analysing low, medium and high expressors independently, there was an effect of high glutamine levels on cytokine release from the low and medium expressors. Likewise, there was no effect of glutamine supplementation on the TNF-α release, although a tendency to lower cytokine release at high levels of glutamine. Irrespective of the glutamine concentrations, there was no difference in IL2 release between the IL2 -330 genotypes; there was an effect of the TNF-α genotypes, with the AG and GG genotypes showing greater cytokine release than from the AA genotype.