呼吸道合胞病毒毛细支气管炎与白细胞介素-10-592A/C基因多态性的相关性研究

目的 探讨白细胞介素-10-592A/C基因多态性与呼吸道合胞病毒(RSV)毛细支气管炎易感性、病情的关联和对血清白细胞介素(IL)-10的影响.方法 采用聚合酶链反应-限制性片段长度多态性检测100例汉族RSV毛细支气管炎患儿(病例组)和100例健康儿童(对照组)IL-10-592A/C位点单核苷酸多态性;应用ELISA法检测病例组血清IL-10水平.结果 病例组IL-10-592A/C位点基因型频率分别为AA 44%、AC 38%、CC 18%,等位基因频率分别为A 63%、C 37%;对照组基因型频率分别为AA 41%、AC 42%、CC 17%,等位基因频率分别为A 64%、C 36%;两组基因型及等位基因频率比较差异均无显著性(χ2=0.33,P>0.05;χ2=0.43,P>0.05).病例组IL-10-592A/C位点不同基因型患儿血清IL-10水平比较差异无显著性(F=0.87,P>0.05).IL-10-592A/C位点基因型频率在轻度和中重度患儿之间的差异无显著性(χ2=2.67,P>0.05).结论 IL-10-592A/C位点基因多态性与RSV毛细支气管炎不存在关联.     

白细胞介素-8-251A/T和781C/T基因多态性与呼吸道合胞病毒毛细支气管炎的相关性

目的 探讨白细胞介素-8(IL-8)-251A/T和781C/T基因多态性与呼吸道合胞病毒(RSV)毛细支气管炎易感性的关系.方法 应用聚合酶链反应-限制性酶切片段长度多态性技术检测150例RSV毛细支气管炎患儿和120例健康对照儿童血IL-8-251A/T和781C/T的单核苷酸多态性(SNP),分析其基因型、等位基因型的分布,并对2个SNP位点进行连锁和单体型分析.结果 1.病例组和健康对照组均发现IL-8-251A/T位点基因多态性,均可见AA、AT和TT 3种基因型;其中病例组AA、AT、TT基因型频率分别为12.0%、56.7%、31.3%,A、T等位基因频率分别为40.3%、59.7%;健康对照组AA、AT、TT基因型频率分别为7.5%、54.2%、38.3%,A、T等位基因频率分别为34.6%、65.4%;病例组IL-8-251A/T基因型及等位基因频率与健康对照组比较,差异均无统计学意义(x2=2.373,1.875 P0.05).2.病例组和健康对照组均发现IL-8 781C/T位点基因多态性,均可见CC、CT、TT3种基因型;其中病例组CC、CT、TT基因型频率分别为38.7%、40.7%、20.6%,C、T等位基因频率分别为59.0%、41.0%;健康对照组CC、CT、TT基因型频率分别为40.8%、41.7%、17.5%,C、T等位基因频率分别为61.7%、38.3%,二组基因型及等位基因频率比较,差异均无统计学意义(x2=0.442,0.396 P0.05).3.IL-8-251A和781C是连锁的(D'=0.348±0.019,r2=0.114 P<0.05).4.病例组AC单体型频率显著增加(x2=9.047 P<0.05).结论 IL-8-251A和781C形成的AC单体型与RSV毛细支气管炎易感性相关,即部分RSV毛细支气管炎的易感基因可能存在于含有AC单体型的基因片段或与该段基因紧密连锁.     

白细胞介素-10单核苷酸多态性与呼吸道合胞病毒毛细支气管炎的病例-对照研究

目的 探讨温州地区汉族儿童IL-10/T-819C和A-1082G位点单核苷酸多态性(SNPs)的分布特征及其与呼吸道合胞病毒(RSV)毛细支气管炎易感性、病情的关联和对血清总IgE和鼻咽分泌物(NPS)IL-10的影响.方法采用DNA测序法检测114例汉族RSV毛细支气管炎患儿(病例组)和90例健康儿童(健康对照组)IL-10/T-819C、A-1082G位点SNPs;应用化学发光法检测病例组血清总IgE;用ELISA法检测病例组NPS IL-10水平.结果病例组IL-10/T-819C位点TT、CT、CC基因型频率比较分别为 45.6%、40.4%和14.0%,等位基因频率分别为T 65.8%、C 34.2%;健康对照组基因型频率分别为TT 47.8%、CT 36.7%、CC 15.5%,等位基因频率分别为T 66.1%、C 33.9%,二组基因型及等位基因频率比较差异均无统计学意义(χ2=0.306,0.005Pa>0.05).病例组IL-10/A-1082G AA、AG基因型频率分别为86.8%、13.2%,等位基因频率分别为A 93.4%、G 6.6%;健康对照组基因型频率分别AA 87.8%、AG 12.2%,等位基因频率分别为A 93.9%、G 6.1%,二组比较差异均无统计学意义(χ2=0.040,0.037Pa>0.05).病例组IL-10/T-819C和IL-10/A-1082G位点不同基因型患儿NPS IL-10和血清总IgE水平比较差异均无统计学意义(H=0.676,F=0.687;Z=0.620,t=1.107Pa>0.05).IL-10/T-819C位点和A-1082G位点基因型频率在轻度和中重度患儿之间的差异均无统计学意义(χ2=0.779,1.793Pa>0.05).结论温州地区汉族儿童存在IL-10/T-819C和A-1082G位点基因多态性,但未发现其与RSV毛细支气管炎存在关联.     

白细胞介素-4基因C-589T多态性与呼吸道合胞病毒毛细支气管炎发病的相关性

目的 探讨白细胞介素-(IL-4)基因C-589T位点多态性与呼吸道合胞病毒(RSV)毛细支气管炎发病的相关性.方法 采用聚合酶链-限制性片段长度多态法(PCR-RFLP)检测RSV毛细支气管炎组(毛支组)和健康对照组儿童IL-4/C-589T位点多态性;用化学发光法和酶联免疫分析法(ELISA)分别检测RSV毛支组血清总IgE和鼻咽分泌物(NPS)中IL-4水平.结果 二组均发现IL-4/C-589T位点基因多态性,但仅见TT和CT 2种基因型,以TT纯合子基因型为主,其中RSV毛支组IL-4/C-589T位点TT、CT基因型频率分别为94.6%、5.4%,T、C等位基因频率分别为97.3%、2.7%;对照组TT、CT基因型频率分别为76.9%、23.1%,T、C等位基因频率分别为88.4%、11.6%.RSV毛支组TT基因型和T等位基因频率均显著高于对照组(χ2=15.995,14.842 Pa＜0.01),且T等位基因携带者患病的危险性为C等位基因携带者的4.73倍(OR=4.73 P=0).但2种基因型RSV毛支患儿间NPS中IL-4及血清总IgE水平均无显著性差异(Z=0.515,t=0.260 Pa＞0.05).IL-4/C-589T位点多态性在轻度和中重度患儿间无显著差异(χ2=0.024 P＞0.05).结论 温州地区儿童存在IL-4/C-589T位点的多态性.IL-4/C-589T 位点T等位基因可能是影响RSV毛细支气管炎发病的一个重要候选基因.     

INF-γ/A+874T位点基因多态性与呼吸道合胞病毒毛细支气管炎的相关性

目的：干扰素-γ(IFN-γ)分泌不足可能在严重呼吸道合胞病毒(RSV)感染的发病中发挥重要作用。IFN-γ/A+874T基因位点存在多态性,可能与RSV感染的病情存在关联。该研究分析INF-γ/A+874T基因位点在温州地区汉族儿童的分布特征;进一步探讨INF-γ/A+874T位点基因多态性与RSV毛细支气管炎易感性、病情的相关性及对鼻咽分泌物 INF-γ和血清总IgE水平的影响。方法：采用DNA测序法检测114例住院的汉族RSV毛细支气管炎患儿和90例汉族健康体检儿童INF-γ/A+874T位点基因多态性;采用酶联免疫吸附法测定鼻咽分泌物INF-γ水平,化学发光法测定血清总IgE水平。结果：两组均存在INF-γ/A+874T位点基因多态性,以AA纯合子基因型为主,其中RSV毛细支气管炎组AA、AT基因型频率分别为82.5%,17.5%,对照组分别为AA 77.8%,AT 21.1%,两组差异无显著性意义;病例组等位基因频率分别为A 90.4%,T 9.6%,对照组分别为A 88.3%,T 11.7%,两组差异均无显著性意义。轻度和中重度患儿INF-γ/+874位点2种基因型的差异亦无显著性意义。病例组2种基因型鼻咽分泌物INF-γ及血清总IgE水平差异均无显著性意义。结论：温州地区汉族儿童存在INF-γ/A+874T位点基因多态性,但未发现该位点变异与RSV毛细支气管炎易感性、病情、鼻咽分泌物INF-γ及血清总IgE水平存在关联。［中国当代儿科杂志,2009,11（1）：21-24］     

热休克蛋白70-2和肿瘤坏死因子α基因多态性与儿童过敏性紫癜相关性研究

目的:观察热休克蛋白70-2（HSP70-2）和TNF-α基因多态性与儿童过敏性紫癜（HSP）的相关性。方法:纳入2008年9月至2009年5月在南京儿童医院诊断为HSP的患儿为HSP组,健康查体儿童为对照组。采用PCR-RFLP法检测两组HSP70-2 基因1267A/G和TNF-α基因-380G/A多态性,并分析其与HSP和肾损害的相关性。结果:HSP组纳入205例,对照组纳入53名。①HSP组和对照组HSP70-2基因1267位点GG基因型频率分别为22.9%和9.4%,差异有统计学意义（χ2=4.764,P<0.05）;非肾损害亚组和肾损害亚组AA、AG、GG基因型频率差异无统计学意义。②HSP组和对照组TNF-α基因-308位点AA基因型频率分别为8.3%和1.9%,差异有统计学意义（χ2=6.447,P<0.05）;A等位基因频率HSP组高于对照组（24.4％ vs 12.3%, χ2=7.241,P<0.05）;非肾损害亚组和肾损害亚组GG、GA、AA基因型和A等位基因频率差异均无统计学意义。结论:HSP70-2基因1267位点GG基因型、TNF-α基因-308位点AA基因型可能是HSP发病的遗传学易感因素,但与肾损害发展可能无明显相关性。     

儿童紫癜性肾炎肿瘤坏死因子α基因多态性分析

目的：探讨肿瘤坏死因子α（TNF-α）-308G/A基因多态性与儿童紫癜性肾炎（HSPN）的关系。方法应用聚合酶链反应（PCR）扩增产物直接测序方法对110例过敏性紫癜（HSP组）汉族儿童进行TNF-α-308G/A基因型分析,包括紫癜性肾炎52例（HSPN组）,无合并肾炎58例（单纯HSP组）。酶联免疫吸附法检测血浆TNF-α水平。90例健康汉族儿童作为对照组。结果HSP组TNF-α-308基因型分布频率与对照组比较差异无统计学意义（P>0.05）。HSPN组GA基因型（29%）、A等位基因频率（18%）均明显高于单纯HSP组（分别为10%和7%,P<0.05）,其中GA+AA 基因型患儿血浆TNF-α水平（7.1±2.3 pg/mL）较GG基因型患儿（5.7±1.5 pg/mL）明显升高（P<0.05）。结论TNF-α-308G/A 基因多态性与HSP儿童肾脏损害的发生有关,A等位基因可能是儿童HSPN的易感基因。     

RANTES启动子-28C/G基因多态性与呼吸道合胞病毒致细支气管炎易感性的关联

目的 探讨正常T淋巴细胞表达和分泌的活性调节蛋白RANTES的启动子-28C/G基因多态性与呼吸道合胞病毒(RSV)致细支气管炎(既往称毛细支气管炎)易感的关联性.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238例RSV细支气管炎患儿及288例正常对照者的RANTES-28C/G多态性,ELISA法检测血清总IgE浓度,全自动血细胞计数仪计数嗜酸性粒细胞,并搜集受检者的特应性体质史、特应性家族史及临床相关资料.结果 RANTES-28C/G基因型分布在RSV细支气管炎组和对照组均符合Hardy-Weinberg平衡.与对照组比较,RANTES-28C/G基因型及等位基因频率在RSV细支气管炎组中的分布差异均有统计学意义(G=10.22,P＜0.01;x2=9.708,P＜0.01);与CC基因型个体相比,携带G等位基因的个体发生RSV细支气管炎的风险增加了2.09倍(OR:2.09,95% CI=1.32～3.30,P＜0.01).在RSV细支气管炎组,携带G等位基因个体具有特应性体质和特应性家族史的风险分别比CC基因型个体增加了1.85倍(OR=1.85,95% CI=1.01～3.38,P＜0.05)和1.91倍(OR=1.91,95% CI=1.03～3.54,P＜0.05),其嗜酸性粒细胞计数亦显著升高(Z=-2.303,P＜0.05).结论 RANTES启动子-28C/G基因多态性与RSV细支气管炎易感性相关联,并且-28G等位基因与RSV细支气管炎患儿的特应性体质及特应性家族史相关联.     

白介素-4基因C-33T多态性与呼吸道合胞病毒毛细支气管炎的相关性

目的 研究白介素-4(IL-4)基因C-33T与呼吸道合胞病毒(RSV)毛细支气管炎的易感性、病情严重程度的关系及对血清总IgE和鼻咽分泌物(NPS)IL-4水平的影响.方法 采用聚合酶链-限制性片段长度多态法(PCR-RFLP)检测130例RSV毛细支气管炎患儿和108例对照组儿童IL-4/C-33T位点多态性,分别用化学发光法和酶联免疫分析法,检测RSV毛细支气管炎患儿血清总IgE和NPs中IL-4水平.结果 两组IL-4启动子区C-33T位点均可见TT、CT和CC 3种基因型,其中病例组,TT、CT和CC基因型频率分别为66.9%、26.9%和6.2%,对照组分别为69.4%、26.9%和3.7%,两组差异无统计学意义(X2=0.758,P>0.05);病例组T、C等位基因频率分别为80.3%、19.7%,对照组分别为82.9%、17.1%,两组差异亦无统计学意义(X2=0.073,P>0.05;OR=0.847,P>0.05).病例组三种基因型间NPS中IL-4及血清总IgE水平差异均无统计学意义(H=0.103,F=0.529,P均>0.05);三种基因型频率在轻度组和中重度组间的差异亦无统计学意义(X2=0.825,P>0.05).结论 温州地区儿童存在IL-4/C-33T位点的多态性,但未发现其与RSV毛细支气管炎存在关联.     

白细胞介素-6基因-572C/G多态性与全身炎症反应综合征的相关性

目的 探讨IL-6基因-572C/G多态性与小儿全身炎症反应综合征(SIRS)的关系.方法 选用病例-对照的研究方法,以本院53例SIRS患儿为SIRS组,并随机挑选50例健康儿童为健康对照组(所有儿童均为汉族,来自广东省深圳市),采用酚/氯仿法提取2组儿童外周血白细胞DNA,并制备血清.自行设计引物,应用聚合酶链反应对2组研究对象的IL-6基因启动子-572位点的特异性片段进行扩增,再应用限制性片段长度多态性法对扩增的特异性片段用限制性内切酶进行酶切.酶切产物采用琼脂糖凝胶电泳法进行检测,分析2组儿童IL-6基因-572位点基因型及等位基因频率的分布.应用酶联免疫吸附法(ELISA)检测2组儿童血清IL-6水平,观察不同基因型对其血清IL-6水平的影响.采用SPSS 13.0软件进行数据分析.结果 IL-6基因-572位点基因型和等位基因频率在2组间分布差异均有统计学意义(Pa＜0.05);SIRS组GG基因型和G等位基因频率均显著高于健康对照组(Pa＜0.05);携带G等位基因个体患SIRS的风险约是C等位基因型个体的5.91倍(95% CI为2.76～12.64);SIRS组血清IL-6水平显著高于健康对照组(P＜0.05);G等位基因携带者血清IL-6水平显著高于CC基因携带者(P＜0.05).结论 IL-6基因-572C/G多态性与中国汉族儿童SIRS发病密切相关;血清IL-6水平可能受其基因多态性的影响.     

白细胞介素8-251位点基因多态性与呼吸道合胞病毒毛细支气管炎及毛细支气管炎后婴幼儿喘息的关系

目的探讨IL-8启动子-251A／T基因多态性与呼吸道合胞病毒（RSV）致毛细支气管炎（简称毛支）及毛支后婴幼儿喘息的相关性。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320例RSV毛支患者及272例正常对照者IL-8基因-251A／T多态性,酶联免疫吸附试验（ELISA）法检测血清IL-8、IgE浓度。并对人组的毛支患儿随访3年,记录婴幼儿毛支后喘息再发的情况。结果（1）RSV毛支组和对照组IL-8-251位A等位基因频率分别为45．6％、37．7％,两组问比较差异有统计学意义（P〈0．05）;（2）基因型TT、AT、AA的毛支患儿血清IL-8浓度分别为（17±6）ng／L、（21±7）ng／L、（24±9）ng／L,三种基因型间比较差异有统计学意义（P〈0．01）;（3）RSV毛支后喘息组和未再喘息组IL-8-251位A等位基因频率分别为54．6％、35．8％,两组间比较差异有统计学意义（P〈0．05）。结论IL-8启动子-251A／T基因多态性与RSV毛支易感性相关,且携带IL-8-251A等位基因的患儿在RSV毛支后更容易出现喘息。     

Role of cytokine gene (IFN-γ, TNF-α, TGF-β1, IL-6, and IL-10) polymorphisms in pathogenesis of acute rheumatic fever in Turkish children

Acute rheumatic fever (ARF) is a delayed immunologically mediated sequela of throat infection by group A β-hemolytic streptococci. Inflammatory cytokines may play a pathogenic role in ARF. The objective of this study was to investigate the potential associations between interferon (IFN)-γ, interleukin (IL)-6, tumor necrosis factor (TNF)-α, transforming growth factor (TGF)-β1, and IL-10 gene polymorphisms and childhood ARF. Thirty-eight ARF patients and 40 age- and sex-matched healthy controls were analyzed for eight polymorphisms in five different cytokine genes [IFN-γ (+874), IL-6 (-174), TNF-α (-308), TGF-β1 (+10, +25), and IL-10 (-1082, -819, -592)]. Cytokine genotyping was performed by polymerase chain reaction sequence-specific primer methods. Patients with ARF had significantly higher frequencies of IFN-γ (+874) polymorphism in both TT genotype (p=0.0002) and T allele (p=0.0004). No statistically significant differences were observed in genotypes, haplotypes, and allele frequencies of IL-6, TNF-α, TGF-β1, and IL-10 genes between ARF and control groups (p>0.05). GG genotype frequency of TNF-α gene (low expression) was higher in patients who had previous ARF history (p=0.006). High expression of TGF-β1 (TT/GG, TC/GG) was more frequent in patients with CRP positivity (p=0.034). IL-6 CC genotype (low expression) frequency was higher in patients with tricuspid valve insufficiency (p=0.002), while IFN-γ TT genotype (high expression) frequency was higher in patients with mitral valve prolapse (p=0.049). Conclusion: High expression of the IFN-γ gene may carry a higher risk for ARF in Turkish children, while IL-6, TNF-α, and TGF-β1 may have an impact in mediating some clinical and laboratory manifestations of the disease.     

Interleukin (IL)-18 polymorphism 133C/G is associated with severe respiratory syncytial virus infection

BACKGROUND: Respiratory syncytial virus (RSV) is a major cause of bronchiolitis in infants. During the course of RSV infection, predominant T helper cell (TH) 2 response is associated with disease progression, whereas predominant TH1 reaction provides convalescence. Interleukin (IL)-18 plays an important role in adjusting the TH1/TH2 immune response to viral infections. Thus, we tested the hypothesis that polymorphisms in IL-18 were associated with severe RSV-associated diseases. METHODS: We chose to study the promotor polymorphisms -607A/C (rs1946518) and -137G/C (rs187238), the 2 exon polymorphisms 113T/G (rs360718) and 127C/T (rs360717), and 2 intron polymorphisms 5304A/G (rs795467) and 133G/C (rs360721) within the IL-18 gene. Genotyping was performed on 154 children with severe RSV infection as defined by strict clinical criteria and on 270 controls. Statistical analyses of single polymorphisms made use of the Armitage's trend test, haplotypes were calculated with FASTEHPLUS and FAMHAP. RESULTS: -133G/C showed association with severe RSV infection (P = 0.043). The association was further supported by haplotype analyses with all 6 polymorphisms (P < 0.00001 for association with RSV). CONCLUSIONS: This study indicates possible involvement of IL-18 in the determination of severe RSV-associated diseases. Defining the genetic basis of RSV bronchiolitis might help us in identifying new drug targets for a more specific therapy. In addition, it might enable an early identification of children at risk for RSV bronchiolitis and thus make a selective prevention feasible.     

肿瘤坏死因子-αG-308A多态性与自发性早产遗传易感性的关联研究

目的探讨肿瘤坏死因子-α(TNF-α)G-308A多态性和自发性早产(SPTB)易感性的关联。方法收集753例SPTB患儿为病例组,681例足月新生儿为对照组,利用Sequenom Mass ARRAY~?SNP检测技术对TNF-α基因G-308A多态性位点进行单核苷酸多态性检测。结果病例组和对照组等位基因G、A分布频率之间的差异无统计学意义(P=0.35);GG、GA、AA基因型构成比之间的差异也无统计学意义(P=0.64)。Logistic回归分析发现TNF-α基因G-308A位点与SPTB的遗传易感性不相关(OR=0.85,95%CI:0.61~1.19,P=0.35)。结论 TNF-α基因G-308A多态性位点与SPTB遗传易感性不相关。     

广州地区汉族儿童白细胞介素-6 基因174 位点及肿瘤坏死因子β 基因NcoI 位点多态性分析

目的 探讨白细胞介素-6（IL-6）基因（-174）位点及肿瘤坏死因子β（TNFβ）NcoI 位点多态性在广州地区汉族儿童中的分布特征,为IL-6（-174） 及TNFβNcoI 位点多态性与全身炎症反应综合征（SIRS）的相关性研究提供基础资料。方法 选取481 名广州汉族儿童,采用等位基因特异性扩增多聚酶链（ASPCR）和聚合酶链反应- 限制性片段长度多态性法（PCR-RFLP）对IL-6（-174） 及TNFβNcoI 位点进行基因水平多态性分析,并结合文献进行了不同种族间的分析比较。结果 广州地区汉族儿童群体IL-6（-174）位点基因型均为G/G,广州地区汉族人群该位点变异不属常见变异或不存在变异;TNFβNcoI 位点有TNFβ1*1、TNFβ1*2、TNFβ2*2 3 种基因型,频率分别为24.7%、49.7% 和25.6%,样本分布符合Hardy-Weinberg 平衡,TNFβ1 等位基因分布频率较欧美白种人高,差异有统计学意义（P结论 广州地区汉族人群TNFβNcoI 位点多态性普遍存在,基因型分布特征与白种人存在差异。样本为Hardy-Weinberg 平衡群体,可进一步用于广州地区汉族儿童SIRS 的关联性分析。广州地区汉族人群IL-6（-174）位点多态性罕见或不存在,不宜选取该基因位点单核苷酸多态性作疾病的关联性分析。     

IL-13 基因+2044G/A 多态性与儿童哮喘风险和血清IL-13 水平的相关性研究

目的探讨IL-13基因+2044G/A多态性与儿童哮喘发病风险及哮喘儿童血清IL-13水平的关系。方法采用PCR-RFLP和ELISA方法,对90例支气管哮喘患儿(哮喘组)和82例健康儿童(对照组)IL-13基因+2044G/A多态性和血清IL-13水平进行检测,计算基因型、等位基因频率及其所对应的血清IL-13水平。结果哮喘组和对照组IL-13+2044G/A多态性3种基因型的分布差异有统计学意义(P0.001);与GG基因型比较,GA基因型儿童哮喘风险增加3.52倍(95%CI:1.82~6.82),AA基因哮喘风险增加3.71倍(95%CI:1.06~12.97)。哮喘组A等位基因频率为36.1%,高于对照组的18.3%,差异有统计学意义(P0.001)。与G等位基因比较,A等位基因携带儿童哮喘风险增加2.53倍(95%CI:1.53~4.16)。哮喘组患儿血清IL-13水平为151.82(134.33~166.68)ng/L,对照组为79.00(58.74~111.09)ng/L,两组差异有统计学意义(P0.001)。哮喘组GG、GA和AA基因型的血清IL-13水平均分别高于对照组,差异有统计学意义(P均0.01)。哮喘组GG、GA和AA 3种基因型之间血清IL-13水平的差异也有统计学意义(P0.01),其中GA和AA基因型血清IL-13水平高于GG基因型。结论 IL-13基因+2044G/A多态性与支气管哮喘儿童血清IL-13水平具有关联性,且A等位基因可能造成了哮喘儿童血清高IL-13水平,携带A等位基因的儿童哮喘风险增加。     

Interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha) levels and IL-6, TNF-polymorphisms in children with thrombosis

Infection has an important role in the pathogenesis of thrombosis and it becomes more prominent in childhood cases, in whom the infection frequency is higher. It has been suggested that patients with high tumor necrosis factor (TNF)-alpha and interleukin (IL)-6 levels might be at increased risk of developing thrombotic complications owing to the effects of these cytokines on the coagulation pathway. Functional polymorphisms in the promoter regions of the genes coding for TNF-alpha and IL-6 are associated with increased plasma levels of these cytokines. The aims of this study were to evaluate the serum levels of acute phase reactants, such as C-reactive protein, and of cytokines (TNF-alpha and IL-6) and to investigate the association between the TNF-alpha-308 G/A and IL-6-174 G/C polymorphisms in Turkish pediatric patients with thrombosis. Fifty-eight children with thrombosis (group 1) and 89 controls (group 2) were included in the study. Patients who had a history of infection within the 15 days before thrombosis were classified as group 1a and those who had no infection history before thrombosis were classified as group 1b. Serum TNF-alpha did not differ significantly between the groups. However, the IL-6 level was higher in group 1a than in group 1b (P<0.05). The genotype distribution and allele frequencies of TNF-alpha G/A polymorphism were significantly higher in the thrombotic children without infection and in the control group than in the thrombotic children with an infection history (P<0.05). The IL-6-174 C/C genotype was significantly higher in thrombotic children with an infection history (P<0.05); there were no differences between the groups in mean allele frequency (Table 2). On the basis of our results, patients with a history of infection seem to have higher C-reactive protein and IL-6 levels and IL-6-174 C/C genotype. Furthermore, venous thrombosis is more frequent in this group than arterial thrombosis (P<0.05).