大肠癌IFN-γ基因+874位点的单核苷酸多态性

目的：探讨中国浙江地区汉族人群中IFN-γ基因 874位点多态性分布,分析其与大肠癌的相关性.方法：应用突变特异性扩增系统(ARMS)- PCR对健康者132例和大肠癌患者92例IFN-γ基因 874位点多态性进行分析,并将PCR产物克隆及测序鉴定.结果：大肠癌患者IFN-γ 874位点AA基因型频率为70.6%,显著高于正常人中的57.6% (P＜0.05).进一步分析显示IFN-γ 874位点AA基因型与患者的年龄、性别、肿瘤部位、Dukes分期无关.结论：IFN-γ 874位点AA基因型可能与大肠癌的发生相关.     

TNF-alpha −308G>A polymorphism is associated with suicide attempts in major depressive disorder

Background

Despite the substantial role of the cytokine network in depression and suicide, few studies have investigated the role of genetic polymorphisms of pro- and anti-inflammatory cytokines in suicide in major depressive disorder (MDD). The aim of this study was to investigate whether tumor necrosis factor-alpha (TNF-alpha) −308G>A, interferon-gamma (IFN-gamma) +874A>T, and interleukin-10 (IL-10) −1082A>G are associated with increased risk for suicide attempts in MDD.

Methods

Among patients with MDD, 204 patients who had attempted suicide and 97 control patients who had not attempted suicide were recruited. A chi-square test was used to identify a possible risk genotype or allele type for suicide. A subsequent multivariate logistic regression analysis was conducted to investigate the influence of a risk genotype or allele type adjusted for other environmental factors. The lethality of the suicide attempt was also tested between genotype and allele types among suicidal patients with MDD.

Results

The GG genotype of the TNF-alpha −308G>A polymorphism was found to significantly increase risk for suicide attempt (adjusted OR=2.630, 95% CI=1.206 to 5.734). IFN-gamma +874A>T and IL-10 −1082A>G were not associated with risk for suicide. Lethality of the suicide attempt was not associated with any of the three cytokine genotypes or allele types.

Limitations

Limitations include a relatively small sample size and a cross-sectional design.

Conclusions

TNF-alpha −308G>A polymorphism is an independent risk factor for suicide attempts in MDD. Future studies should clarify the neural mechanisms by which the GG genotype of TNF-alpha −308G>A influences suicide in MDD.     

γ-干扰素释放分析T-SPOT.TB在结核性疾病中的诊断价值

目的评价γ-干扰素释放分析T-SPOT.TB检测在结核性疾病中的诊断价值。方法采用T-SPOT.TB试剂盒对疑诊或待排结核患者外周血中释放γ-干扰素的结核分枝杆菌特异性T淋巴细胞进行检测。结果γ-干扰素释放分析T-SPOT.TB检测在结核性疾病阳性检出率为83.3%(20/24),明显高于结核菌素试验(tuberculin skin test,TST)的41.7%(10/24)、涂片找抗酸杆菌的26.7%(4/15)、分枝杆菌分离培养的22.2%(2/9),差异有统计学意义(P<0.05)。γ-干扰素释放分析T-SPOT.TB检测诊断结核性疾病敏感性、特异性分别为83.3%、96.4%,显著优于结核菌素试验。结论γ-干扰素释放分析T-SPOT.TB检测是诊断结核的快速敏感方法,在结核性疾病诊断中有重要价值。     

参麦注射液对特发性血小板减少性紫癜患者外周血调节性T细胞的影响

目的：探讨参麦注射液对特发性血小板减少性紫癜患者外周血CD4＋CD2＋5 Treg细胞计数和分泌因子水平的影响。方法选取特发性血小板减少性紫癜患者78例,以随机数字表法分为两组;对照组常规泼尼松治疗,观察组在对照组的基础上加用参麦注射液。对比临床疗效,并分别于治疗前后抽取患者空腹静脉血,以流式细胞法测定CD4＋CD＋25FoxP3＋Treg细胞计数,以ELISA试剂盒测定IL-2、IL-4以及IFN-γ血清含量。结果观察组显效率56．41％、总有效率92．31％,均显著高于对照组的30．77％和71．79％（χ^2＝4．222、3.933,均P ＜0．05）。治疗后观察组和对照组患者外周血 CD4＋CD2＋5 FoxP3＋Treg 细胞计数比30．66％比24.10％、7．49％比5．15％,血清IL-2、IL-4以及IFN-γ血清含量（15．6±4．3） ng／mL比（10．3±3．1） ng／mL、（9．5±2．7）ng／mL比（13．9±3．4）ng／mL、（37．1±4．3）ng／mL比（31．2±4．9）ng／mL,较治疗前均有不等程度的升高,且观察组显著高于对照组（χ^2＝4．329、4．012、4．568、4．105,均P＜0．05）。结论 CD4＋CD2＋5调节性T细胞数量减少或功能缺陷可能参与了特发性血小板减少性紫癜的发病进程,参麦注射液可能能够通过该环节发挥治疗作用。     

结核分枝杆菌感染T细胞斑点试验对淋巴结结核的辅助诊断价值研究

目的 探讨评价结核分枝杆菌感染T细胞斑点试验（T-SPOT.TB）对淋巴结结核的辅助诊断价值.方法 本研究募集北京胸科医院2011年7月至2013年12月收治住院的淋巴结肿大患者185例,最终分为确诊结核性淋巴结组（51例）、非结核性淋巴结疾病组（105例）,其余诊断不明确或临床诊断淋巴结结核患者予以剔除.所有患者均行外周血T-SPOT.TB及免疫印迹法检测结核分枝杆菌抗体.采用SPSS 17.0进行统计学分析,非正态分布的计量资料数据用中位数（上下四分位数）[M（P25,P75）]表示,两组间斑点形成个数（SFCs）数据比较采用Mann WhitneyU检验,组间样本率的比较采用x2检验,以P＜0.05为差异具有统计学意义.结果 T-SPOT.TB和免疫印迹法检测结核分枝杆菌抗体的敏感度分别为92.2％（47/51）和60.8％（31/51）,特异度分别为79.0％（83/105）和77.1％（81/105）,T-SPOT.TB敏感度显著高于免疫印迹法检测结核分枝杆菌抗体方法,差异有统计学意义（x2=13.95,P＜0.01）.结核分枝杆菌特异抗原刺激下结核性淋巴结组SFCs中位数为242个（57,621个）/106外周血单个核细胞（PBMCs）,非结核性淋巴结疾病组SFCs中位数为0个（0,20个）/106 PBMCs,结核性淋巴结组SFCs数量显著高于非结核性淋巴结疾病组,应用Mann Whitney U检验,两组间差异具有统计学意义（U=472.0,P＜0.01）.在T-SPOT.TB结果阳性的69例患者中,47例结核性淋巴结患者SFCs的M（P25,P75）为280个（98,684个）/106 PBMCs,显著高于对照组22例非结核性淋巴结疾病患者SFCs的M（P25,P75）52个（35,93个）/106 PBMCs（U=146.5,P＜0.01）.结论 T-SPOT.TB方法在淋巴结结核的诊断中有着较高的敏感度,有可能成为淋巴结结核辅助诊断的一项重要手段.     

Differential T-cell responses of semi-immune and susceptible malaria subjects to in silico predicted and synthetic peptides of Plasmodium falciparum

Malaria remains a public health hazard in tropical countries as a consequence of the rise and spread of drug and insecticide resistances; hence the need for a vaccine with widespread application. Protective immunity to malaria is known to be mediated by both antibody and cellular immune responses, though characterization of the latter has been less extensive. The aim of the present investigation was to identify novel T-cell epitopes that may contribute to naturally acquired immune responses against malaria. Using the Microsoft software, Epitome™ T-cell peptide epitopes on 19 Plasmodium falciparum proteins in the Plasmodium Database (www.plasmodb.org.PlasmoDB 9.0) were predicted in-silico. The peptides were synthesized and used to stimulate peripheral blood mononuclear cells (PBMCs) in 14 semi-immune and 21 malaria susceptible subjects for interferon-gamma (IFN-γ) production ex-vivo. The level of IFN-γ production, a marker of T-cell responses, was measured by ELISPOT assay in semi-immune subjects (SIS) and frequently sick subjects (FSS) from an endemic zone with perennial malaria transmission. Of the 19 proteins studied, 17 yielded 27 pools (189 peptides), which were reactive with the subjects’ PBMCs when tested for IFN-γ production, taking a stimulation index (SI) of ≥2 as a cutoff point for a positive response. There were 10 reactive peptide pools (constituting eight protein loci) with an SI of 10 or greater. Of the 19 proteins studied, two were known vaccine candidates (MSP-8 and SSP2/TRAP), which reacted both with SIS and FSS. Similarly the hypothetical proteins (PFF1030w, PFE0795c, PFD0880w, PFC0065c and PF10_0052) also reacted strongly with both SIS and FSS making them attractive for further characterization as mediators of protective immunity and/or pathogenesis.     

外周血淋巴细胞亚群、细胞因子在未足月胎膜早破孕妇中水平变化及与绒毛膜羊膜炎发生的相关性研究

目的 探究外周血T淋巴细胞亚群、B淋巴细胞亚群及细胞因子在未足月胎膜早破(preterm premature rupture of membrane,PPROM)孕妇中水平变化及与绒毛膜羊膜炎发生的相关性.方法 选取2018年1月—2019年12月于本院就诊的PPROM孕妇50例作为研究组,以同期未发生胎膜早破孕妇5...     

念珠菌性外阴阴道炎阴道分泌物中IL-10和IFN-γ的表达水平测定

目的:测定念珠菌性阴道炎阴道分泌物中白细胞介素-10(IL-10)、干扰素-γ(IFN-γ)的表达水平,探讨不同类型细胞因子的表达水平与念珠菌性阴道炎发病的关系。方法:ELISA法检测初发组和复发组念珠菌性阴道炎的妇女阴道分泌物中IL-10I、FN-γ的表达水平,以健康体检妇女为对照组。结果:初发和复发念珠菌性阴道炎的阴道分泌物中IL-10的表达水平均显著高于健康对照组,复发组较初发组的表达水平也有显著性差异(P<0.05);初发和复发念珠菌性阴道炎的阴道分泌物中IFN-γ的表达水平无显著性差异(P>0.05),但均高于健康对照组(P<0.05)。结论:Th1型和Th2型细胞因子的表达异常可能与念珠菌性阴道炎发病和复发有关。     

慢性荨麻疹患者血清25羟基维生素D水平检测及意义

目的 检测慢性荨麻疹患者血清25羟基维生素D水平,探讨25羟基维生素D（25HVD）在慢性荨麻疹（CU）发病中的作用。方法 收集50例CU患者及40例健康对照血清,同时应用CU症状评分标准（UAS）对疾病进行评分;用 ELISA测定血清25HVD、干扰素γ（IFN?γ）、白细胞介素4（IL?4）、免疫球蛋白E（IgE）水平。所得数据采用t检验、秩和检验、直线相关回归分析进行统计学分析。结果 CU组血清25HVD水平［（15.20 ± 7.72） μg/L］明显低于对照组［（21.54 ± 8.31） μg/L,t = 3.75,P < 0.05］,且两组25HVD水平分布比较,差异有统计学意义（H = 17.9,P < 0.05）。UAS评分重度组25HVD水平［（15.57 ± 7.38） μg/L］与轻度组［（14.86 ± 6.28） μg/L］差异无统计学意义（t = 0.37,P > 0.05）。CU组血清IFN?γ水平明显低于对照组（t = 15.34, P < 0.05）,但血清IL?4和IgE水平明显高于对照组（t值分别为6.54, 4.88,均P < 0.05）。CU组血清25HVD水平与IFN?γ水平呈正相关（r = 0.738,P < 0.05）,与IL?4水平呈负相关（r = -0.689,P < 0.05）,与IgE水平无相关性（r = -0.271,P > 0.05）。结论 CU患者血清25HVD水平明显降低,可能通过介导Th1细胞/Th2细胞失衡参与CU的发生。     

鼻咽癌患者IL-8和IFN-γ基因多态性的研究

目的 研究IL-8和IFN-γ基因多态性在鼻咽癌(NPC)患者中的频率分布,并分析其与NPC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(PCR-RFLP)分析105例NPC患者和109例健康对照者IL-8基因-251(A/T)位点的基因多态性;应用聚合酶链反应、非变性聚丙烯酰胺凝胶电泳及银染技术检测两组人群中IFN-γ CA短串联重复序列多态性.分析两位点多态性与NPC的关系.结果 NPC组IL-8 -251(A/T)位点基因型、等位基因频率与对照组相比差异无统计学意义(P＞0.05);NPC组IFN-γ(CA)n 13等位基因频率低于对照组,差异具有统计学意义(χ2=5.878,P=0.015),其基因型(CA)13 /(CA)13 、(CA)13 /(CA)13-和(CA)13-/(CA)13-在两组人群中的分布也有差异(χ2=15.181,P=0.001). 结论在研究人群中未发现IL-8 -251(A/T)位点多态性与NPC相关;IFN-γ(CA)n 13等位基因与NPC具有相关性,提示IFN-γ重复序列基因多态性可能在决定鼻咽癌遗传易感性方面有一定意义.