cag A阳性幽门螺杆菌与老年胃十二指肠病的相关性

目的 探讨本地区老人幽门螺杆菌（Hp）tagA基因存在状况及其与老年胃十二指肠病的关系。方法 收集89例老年和96例青壮年慢性胃炎、消化性溃疡患菌及30例正常对照人群的血清标本及胃组织标本,应用血清学检验其Hp-cag A阳性菌株感染状况。结果 89例老年患者中慢性胃炎、胃溃疡、十二指肠溃疡的Hp-cag A基因的阳性率分别为73．5％（38／52）、81．3％（13／16）及85．7％（18／21）;96例青壮年患者中慢性胃炎、胃溃疡、十二指肠溃疡的Hp-cag A基因的阳性率分别为59．3％（32／54）、68．8％（11／16）及61．5％（16／26）;对照组Hp-cag A阳性病株感染率为33．3％,各疾病组间Hp-cag A阳件菌株感染率差异无显著性（P〉0．05）．仍均高于对照组（P〈0．05）;cag A阳性Hp菌株感染率老年组高于青壮年组（P〈0．05）。结论 本地区老年患者cag A阳性Hp菌株感染与上述3种胃十二指肠疚病的发生均密切相关．老年患者感染的Hp绝大多数为cag A阳性菌株。     

丽珠胃三联治疗幽门螺杆菌相关性胃炎及溃疡的疗效观察

幽门螺杆菌 (Hp)是慢性胃炎及消化性溃疡的重要病因之一 ,根除 Hp能使炎症消失 ,溃疡愈合加快 ,复发率减少。2 0 0 1～ 2 0 0 2年 ,我们采用丽珠胃三联 (由枸橼酸铋钾、克拉霉素、替硝唑组成的三联复合包装片剂 )治疗 Hp感染的慢性胃炎及消化性溃疡患者 5 4例 ,取得较好疗效 ,现报告如下。资料与方法 :本组男 2 8例 ,女 2 6例 ;年龄 18～ 70岁 ,平均 3 5 .2岁。胃镜检查示慢性胃炎 3 0例 ,胃溃疡 17例 ,十二指肠溃疡 7例。主要临床表现为腹痛、反酸、嗳气及黑便 ;胃活检快速尿素酶及 1 3C-尿素呼气试验均阳性 (定为 Hp感染 )。本组近 1个…     

Hp阳性监测在慢性乙型肝炎合并消化性溃疡患者中的临床意义

目的探讨Hp阳性监测对慢性乙肝患者发生消化性溃疡的风险提示作用。方法选取驻马店市中心医院2014—2019年收治的300例慢性乙肝消化性溃疡患者,其中胃溃疡患者130例(胃溃疡组),十二指肠溃疡患者170例(十二指肠溃疡组)。均进行14C呼气试验检测Hp感染情况,采用免疫印迹法进行Hp抗体血清分型。对比十二指肠溃疡与胃溃疡患者的Hp感染率及Hp抗体血清分型。结果经14C呼气检查,十二指肠溃疡组Hp阳性率(81.18%)显著高于胃溃疡组(52.31%,P<0.05)。十二指肠溃疡组与胃溃疡组中的HpⅠ型感染率为87.68%与67.65%,显著高于HpⅡ型感染率(12.32%与32.35%,P<0.05)。所有患者中HpⅠ型感染率为59.00%,显著高于HpⅡ型感染率(13.00%,P<0.05)。结论慢性乙型肝炎发生消化性溃疡的风险较高,其中更易发生十二指肠溃疡,尤其Hp抗体血清分型为Ⅰ型的患者,值得临床重视。     

胃十二指肠疾病患者中cagA阳性幽门螺杆菌的普遍易感性

明确cagA阳性幽门螺杆菌（H.pyloril)胃十二指肠疾病患者中的感染情况。方法：用聚合酶链反应（PCR）方法扩增从30例十二指肠球部溃疡、30例慢性胃炎和6例胃癌虱活检组织中分离培养出的H.pylori菌株的cagA基因片段,用酶联免疫吸附测定（ELISA）方法检测血清抗H.pylori抗体,用免疫印迹（Western blot)方法检测血清抗cagA抗体。结果：用PCR方法测得的cagA基因阳性率为：十二指肠球部溃疡70％（21／30）,慢性胃炎73％（22／30）,胃癌83％（5／6）。66份血清标本抗H.phlori抗体均为阳性。用Western blot方法测得的抗cagA抗体阳性率为：十二指肠球部溃疡83％（25／30）,慢性胃炎77％（23／30）,胃癌83％（5／6）。结论：在我国人群中,cagA基因不能作为消化性溃疡的标志物,cagA阳性H.pylori在消化性溃疡和慢性胃炎患者中存在普遍易感性。     

幽门螺杆菌cagG基因在胃黏膜中的表达及其意义

目的 研究cagG基因在不同上消化道疾病患者中的分布及其与幽门螺杆菌(Helico-bacter pylori,Hp)感染相关疾病的关系。方法 合成特异性引物,应用聚合酶链式反应(PCR)法扩增145株分离培养自上消化道疾病患者的Hp菌株cagG片段,其中慢性胃炎72例,胃溃疡17例,十二指肠球部溃疡48例,复合溃疡8例。比较cagG阳性、阴性的胃黏膜炎症程度。结果 Hp菌株cagG片段总检出率为91.7％(133/145),在慢性胃炎、胃溃疡、十二指肠溃疡、复合性溃疡中cagG阳性率分别为90.3％。88.2％、93.8％和 100.0％,各组间差异无显著性意义:(P>0.05)。结论 cagG有较高的保守性,在不同的消化道疾病患者的Hp中均有较高的检出率,在不同疾病中的分布无特异性,与胃黏膜炎症程度无明显关系,cagG尚不能单独作为某种疾病致病的相关基因。     

胃炎及消化性溃疡患者血清Hp CagA IgG的检测

目的 cagA 基因阳性 Hp 感染与慢性胃炎、消化性溃疡的关系。方法用 ELISA 检测55例慢性胃炎和33例消化性溃疡患者血清中 Hp CagA IgG 水平。结果慢性胃炎患者的 CagA IgG 阳性率为47.3％,其阳性血清的平均 CagA IgG 水平为27.9±12.9U/ml,而消化性溃疡患者之阳性率为72.7％,CagA IgG 水平为41.6±18.0U/ml,两组比较相差显著(p<0.05和 p<0.01)。结论 CagA 阳性 Hp 具有致溃疡作用。     

血清幽门螺杆菌CagA蛋白抗体滴度与消化性溃疡的关系

目的　通过比较消化性溃疡和慢性胃炎病人血清中CagA抗体阳性的流行情况 ,探讨消化性溃疡和血清幽门螺杆菌CagA蛋白抗体滴度之间的关系。方法　采用病例对照研究设计方案。研究对象来源于中山医院门诊因中上腹痛或腹胀进行胃镜检查的人群。自 1998年 10月 -1998年 12月共收集胃溃疡病例 2 6例 ,十二指肠球部溃疡 2 7例 ,对照组为同期胃镜和病理证实慢性浅表性胃炎的病例 6 5例。Hp感染的判断采用快速尿素酶和病理Giemsa相结合的方法 ,二者均阳性定为阳性。采用ELISA方法检测HpCagA抗体。结果　总的HpCagA抗体的阳性率为 6 2 5 % ,在胃溃疡组为 76 9% ( 2 0 / 2 6 ) ,在十二指肠球部溃疡组为 88 9% ( 2 4/ 2 7) ,在慢性胃炎组为 49 3 % ( 3 2 / 6 5 ) ,胃溃疡组和十二指肠球部溃疡组均明显高于慢性胃炎组 ,差异有显著性。结论　本研究提示CagA蛋白阳性的幽门螺杆菌菌株在消化性溃疡的发病中起一定作用。     

CagA基因菌株Hp与胃、十二指肠疾病

目的通过检测胃、十二指肠疾病患者的幽门螺杆菌（Hp和CagA-Hp-IgG（细胞毒素相关蛋白抗体），探讨CagA基因菌株Hp与胃、十二指肠疾病的相关性。方法206例因胃肠症状在门诊、住院就诊者，男143例，女63例，年龄18岁～76岁．在内镜检查同时取胃粘膜组织4块，十二指肠溃疡者取距幽门1cm～2cm大弯侧，胃溃疡取溃疡边缘处，胃炎取炎症区．2块进病理检查，2块分别用尿素酶快速试验及用PCR法检测Hp，同时抽取静脉血3mL作CagA-Hp-IgG抗体检测．结果用尿素酶快速试验及PCR法检出Hp阳性者180例，男性感染率91％，女性78％，二者差异显著（P＜0．005），各年龄组构成无明显差异．两种检测方法的检出率无明显差异（P＞0．05）．检出CagA-Hp-IgG阳性者95例，在Hp感染组中阳性率89／180（50％），非感染组阳性率6／26（23％），二者差异显著（P＜0．05）．感染组CagA阳性者中，十二指肠球部溃疡44／55（80％），胃溃疡21／34（61％），慢性胃炎24／91（26％），三者差异明显（P＜0．025）．病理结果为轻、中、重度炎症CafA-Hp阳性率分别为25％，56％，70％，三者差异显著（P＜0．005）．结论CagA基因菌株Hp较CagA阴性菌株Hp具有更强的导致炎症的作用．CagA基因Hp是十二指肠球部溃疡、胃溃疡的重要发病因素．     

幽门螺杆菌细胞毒素相关蛋白A与胃十二指肠溃疡关系的病例对照研究

目的本文从流行病学角度研究西安地区幽门螺杆菌细胞毒素相关蛋白A(CagA)阳性Hp菌株感染与胃十二指肠溃疡发病的关系.方法采用病例对照研究方法,病例组与对照组的配比比例为1:2.病例组为本院消化科自1997-10/1998-10连续住院的患者,经内镜检查及病理检查证实为活动期胃溃疡和(或)十二指肠溃疡.对照组分为两组,对照1组为同期住院的本科及其他科住院的非胃十二指肠疾病患者,对照2组为同期普查健康人群.病例组与对照组的配比因素为性别、民族、年龄(相差5岁以内).采用问卷调查,内容涉及与胃十二指肠溃疡发病可能有关的32个因素,对所有因素进行量化,应用SAS软件进行处理.CagA阳性Hp感染的检测结果分析采用X2检验.对所调查因素首先进行1:1及1:2单因素条件Logistic回归分析,有显著性意义的因素,计算近似相对危险度(odds ratio,OR)及其95%的可信区间(confidenceinterval,CI).两因素协同作用采用分层分析方法.对单因素分析时作用较大及调查结果较准确的因素,用多因素条件Logistic回归分析.血清中抗CagA抗体的检测采用斑点金免疫渗滤法(DIGFA).结果①在胃溃疡组与对照1组及对照2组的配对研究中,胃溃疡组的CagA阳性Hp感染率显著高于两个对照组,OR分别为5.0与6.5,P分别＜0.05及＜0.01.②在十二指肠溃疡组与对照1组及对照2组的配对研究中,十二指肠溃疡组的CagA阳性Hp感染率显著高于两个对照组,OR分别为9.33与11.00,P分别＜0.05及＜0.01.③1:1及1:2单因素及多因素Logistic回归分析表明,CagA阳性Hp感染、吸烟、饮酒、食酸辣食物、生活不规律、精神因素等因素与胃十二指肠溃疡发病呈正相关,而按时进餐与胃十二指肠溃疡发病呈负相关.CagA阳性Hp感染与胃溃疡及十二指肠溃疡的发生具有密切的相关性(OR=16.61-84.49).④双因素分层分析中,吸烟、饮酒、生活不规律、精神因素、食酸辣食物等因素与CagA阳性Hp感染之间作用相互独立,但在胃十二指肠溃疡病的发生中具有协同作用.结论消化性溃疡的发生是众多因素共同作用的结果,CagA阳性Hp菌株感染是引起胃溃疡及十二指肠溃疡多因素病因学中一个非常重要的、危险的因素.重视CagA阳性Hp菌株的研究,对预防和治疗消化性溃疡具有重要的临床意义和社会意义.     

上海地区幽门螺杆菌菌株iceA、babA2基因型与临床的关系

目的检测上海地区幽门螺杆菌(Hp)感染患者中Hp菌株iceA、babA2的分布特征，探讨与Hp临床感染结局相关的菌株基因型。方法141株Hp菌株分离自43例慢性胃炎(CG)、47例十二指肠球部溃疡(DU)、30例胃溃疡(GU)和21例非贲门部胃癌患者的胃镜活检标本。采用PCR方法检测Hp菌株的iceA、babA2、cagA和vacA基因型。结果141株Hp菌株中，iceA1、iceA2和babA2的总检出率分别为74．5％(105／141)、15．6％(22／141)和63．8％(90／141)，其中2例(1．4％)为iceA1、iceA2均阳性，16例(11．3％)为iceA1、iceA2均阴性。DU组的babA2检出率显著高于GU组(74．5％比50．0％。P=0．028)，DU组的cagA^ ／babA2^ 检出率亦显著高于GU组(70．2％比46．7％，P=0．039)。其余疾病组之间的babA2检出率差异无显著性。未发现不同临床疾病与iceA基因型的相关性。结论上海地区Hp感染者的菌株基因型主要是iceA1^ ／babA2^ ，babA2在DU和GU的发病机制中起不同作用。未发现iceA亚型与Hp临床感染结局有相关性。     

上海地区幽门螺杆菌菌株cag致病岛基因cagA、cagE、cagT检出率及临床意义

目的 检测上海地区幽门螺杆菌（Ｈｐ）分离株ｃａｇ致病岛（ＰＡＩ）中ｃａｇＡ、ｃａｇＥ、ｃａｇＴ基因,初步探讨ｃａｇＰＡＩ的完整性及其与胃十二指肠疾病的关系。方法 用多聚酶链反应（ＰＣＲ）技术扩增和检测了９９株从１７例慢性浅表性胃炎、２１例慢性性胃炎、１９例胃溃疡、２３例十二指肠溃疡和１９例胃癌中分离的Ｈｐ菌株的ｃａｇＡ、ｃａｇＥ、ｃａｇＴ基因。结果 ｃａｇＡ、ｃａｇＥ和ｃａｇＴ的总检出率分别为８４．８％（８４／９９）、９９．０％（９８／９９）和８４．８％（８４／９９）,各基因检出率在各种胃十二指肠疾病患者分离的Ｈｐ菌株之间差异无显著性（均Ｐ〉０．０５）。９８株ｃａｇＥ阳性的菌株中,有１４株ｃａｇＡ阴性。结论 上海地区分离ｐ菌株绝大多数可能具有完整的ｃａｇＰＡＩ,其完整性与其感染后的临床结局不相关。ｃａｇＥ基因可     

Gene distribution of cagⅡ in Helicobacter pylori-infected patients of Zhejiang Province

AIM: To determine the prevalence of genotypes of cagⅡ in Helicobacter pylori( H pylon)-infected patients in Zhejiang Province and investigate the relationship between these genotypes and the types of gastroduodenal diseases.METHODS: One hundred and seventy one clinical isolates were collected from 70 chronic superficial gastritis, 31 chronic atrophic gastritis, 41 gastric ulcer, 21 duodenal ulcer, 3 gastric and duodenal ulcer, and 5 gastric adenocarcinoma patients. Polymerase chain reaction assays were performed for analysis of cagT, ORF13 and ORF10 genes in the cagⅡ region.RESULTS: Of 171 Hpyloriisolates from Zhejiang patients,159(93.0%) were positive for all the three loci. One isolate (0.6%) was negative for all the three loci, and 11(6.4%) were partially deleted in cagⅡ. The positive rates of cagT,ORF13 and ORF10 genes were 97.1%, 94.7% and 99.4%,respectively. In the strains isolated from the patients with diseases including chronic superficial gastritis, chronic atrophic gastritis, gastric ulcer and duodenal ulcer, the sitive rates of cagT were 95.7%, 100.0%, 95.1% and 100.0%, respectively. The positive rates of ORF13 were 94.3%, 93.5%, 95.1% and 100.0%, respectively. The sitive rates of ORF10 were 98.6%,100.0%,100.0% and 100.0%, respectively. The three genes were all positive in the three H pylori strains isolated from the patients with both gastric and duodenal ulcer. In the five strains isolated from the patients with gastric adenocarcinoma,only one isolate was negative for ORF13. There were no significant differences of the cagT, ORF13 and ORF10 genes among the different gastroduodenal diseases including chronic superficial gastritis, chronic atrophic gastritis,gastric ulcer, duodenal ulcer, both gastric and duodenal ulcer and gastric adenocarcinoma (χ^2=3.098, P＞0.05 for cagT;χ^2=3.935, P＞0.05 for ORF13 and χ^2=6.328,P＞0.05 for ORF10).CONCLUSION: The cagⅡ is not a uniform and conserved entity. Although the genes in cagⅡ are highly associated with the gastroduodenal diseases, the clinical outcome of Hpyloriinfection is not reliably predicted by the three genes in cagⅡ in patients from Zhejiang Province.     

Distribution of cagG gene in Helicobacter pylori isolates from Chinese patients with different gastroduodenal diseases and its clinical and pathological significance

AIM: To determine the distribution of cagG gene of Helicobacter pylori(Hpylori) isolates cultured from patients with various digestive diseases and its relationship with gastroduodenal diseases.METHODS: cagG was amplified by polymerase chain reaction in 145 H pylori isolates cultured from patients with chronic gastritis (n=72), duodenal ulcer (n=48), gastric ulcer (n=17), or gastric and duodenal ulcer (n=8), and the relationship between cagGstatus and the grade of gastric mucosal inflammation was determined.RESULTS: cagG was present in 91.7% of the 145 H pylori isolates, with the rates were 90.3%, 93.8%, 88.2% and 100.0%, respectively, in those from patients with chronic gastritis, duodenal ulcer, gastric ulcer, and gastric and duodenal ulcer. There was no significant difference among the four groups (P＞0.05). The average grade of gastric mucosal inflammation in the antrum and corpus was 1.819±0.325and 1.768±0.312, respectively in cagG positive patients,whereas the average inflammation grade was 1.649±0.297,1.598±0.278 respectively in cagG negative cases (P＞0.05).CONCLUSION: cagG gene of H pylori was quite conservative,and most H pylori strains in Chinese patients were cagG positive.cagG status was not related to clinical outcome or the degree of gastric mucosal inflammation. Therefore, cagG can notbe used as a single marker for discrimination of H pylori strains with respect to a specific digestive disease.     

Gene distribution of cagⅡ in Helicobacter pylori-infected patients of Zhejiang Province

AIM: To determine the prevalence of genotypes of cagⅡin Helicobacter pylori ( H pylori)-infected patients in Zhejiang Province and investigate the relationship between these genotypes and the types of gastroduodenal diseases.METHODS: One hundred and seventy one clinical isolates were collected from 70 chronic superficial gastritis, 31 chronic atrophic gastritis, 41 gastric ulcer, 21 duodenal ulcer, 3 gastric and duodenal ulcer, and 5 gastric adenocarcinoma patients. Polymerase chain reaction assays were performed for analysis of cagT, ORF13 and ORF10 genes in the cagⅡ region.RESULTS: Of 171 Hpyloriisolates from Zhejiang patients,159(93.0%) were positive for all the three loci. One isolate (0.6%) was negative for all the three loci, and 11(6.4%) were partially deleted in cagⅡ. The positive rates of cagT,ORF13and ORF10genes were 97.1%, 94.7% and 99.4%,respectively. In the strains isolated from the patients with diseases including chronic superficial gastritis, chronic atrophic gastritis, gastric ulcer and duodenal ulcer, the sitive rates of cagTwere 95.7%, 100.0%, 95.1% and 100.0%, respectively. The positive rates of ORF13 were 94.3%, 93.5%, 95.1% and 100.0%, respectively. The sitive rates of ORF10 were 98.6%, 100.0%, 100.0% and 100.0%, respectively. The three genes were all positive in the three H pylori strains isolated from the patients with both gastric and duodenal ulcer. In the five strains isolated from the patients with gastric adenocarcinoma,only one isolate was negative for ORF13. There were no significant differences of the cagT, ORF13and ORF10genes among the different gastroduodenal diseases including chronic superficial gastritis, chronic atrophic gastritis,gastric ulcer, duodenal ulcer, both gastric and duodenal ulcer and gastric adenocarcinoma (X2=3.098, P＞0.05 for cagT; X2=3.935, P＞0.05 for ORF13 and X2=6.328, P＞0.05for ORF10).CONCLUSION: The cagⅡis not a uniform and conserved entity. Although the genes in cagⅡ are highly associated with the gastroduodenal diseases, the clinical outcome of Hpylori infection is not reliably predicted by the three genes in cagⅡin patients from Zhejiang Province.     

Geographic differences and the role of cagA gene in gastroduodenal diseases associated with Helicobacter pylori infection.

Helicobacter pylori (H. pylori) is the major causal agent of gastritis, peptic ulcer and gastric cancer. Several bacterium genes seem to be involved in the pathogenicity mechanism. One of them, the cagA gene, has been extensively studied and characterized. In this article we have carried out a study of characteristics and genetic variability of cagA gene in different geographic areas of the world. At the same time, we have summarized several studies that evaluate possible relation of cagA with gastroduodenal diseases associated by H. pylori infection. In our study we found that the presence of the cagA gene has been confirmed in more than 60% H. pylori strains distributed throughout the world. The prevalence of cagA genotype is of 65.4% in gastritis patients, 84.2% in patients with peptic ulcer and 86.5% in those with gastric cancer. It shows a high genetic variability of cagA associated with gastroduodenal diseases that could serve as a virulence marker in H. pylori infected subjects. However, the high prevalence of H. pylori cagA positive strains in some geographic areas does not confirm the strong association between cagA and virulence of strains as described in other countries. Nowadays, cagA gene is considered as a marker for the presence of cag pathogenicity island (cag-PAI) in H. pylori genoma. This region contains several genes that has been involved with the production of cytokines that results in an increased inflammation of host gastric mucosa, but its function is unknown. Probably, others bacterium factors, such as susceptibility host and environmental cofactors could influence in the risk of developing different gastroduodenal diseases associated with H. pylori infection.     

Campylobacter pylori in Japan: bacteriological feature and prevalence in healthy subjects and patients with gastroduodenal disorders

The presence of Campylobacter pylori was investigated in biopsy specimens obtained during gastrofiberscopy from 103 consecutive patients prospectively. Patients included 25 with gastric ulcer, 4 with duodenal ulcer, 5 with coexisting gastroduodenal ulcer, 31 with gastroduodenal ulcer with gastritis, 27 with gastritis, 3 with gastric polyps and 8 with gastric cancer. Results were compared with 20 healthy control subjects who were endoscopically normal. Two specimens each were taken from 3 sites in the stomach. One part was used for a histological study to examine the presence of the organisms. The other part was cultured using Skirrow's agar microaerophilically. Conventional microflora and C. pylori were examined in gastric contents of some cases. Bacteriological features of isolated strains of C. pylori were identical to the NCTC strain. C. pylori was the most dominant organism in gastric contents at any pH level. Detection rates of C. pylori by bacteriological culture were 96% in gastric ulcer, 100% in duodenal ulcer, 80% in coexisting gastroduodenal ulcer, 84% in gastroduodenal ulcer with gastritis, 70% in gastritis, 100% in gastric polyps and 100% in gastric cancer, and the percentages recognized by histological studies were 81, 100, 100, 84, 71, 67, and 57%, respectively. The values in healthy controls were 55% by histological and bacteriological methods (P less than 0.001 compared with overall ulcer patients). These results supported the close association between C. pylori and gastroduodenal diseases.     

TNF gene polymorphisms and Helicobacter Pylori infection in gastric carcinogenesis in Chinese population

BACKGROUND AND AIMS: Helicobacter pylori (H. pylori) is a major cause of chronic gastritis and peptic ulcer disease, and a definite carcinogen for gastric adenocarcinoma. However, the underlying pathogenic mechanisms have not been fully understood although the interactions between environmental, bacterial, and multiple genetic components are likely to be involved. Tumor necrosis factor (TNF) is a key cytokine involved in H. pylori-induced gastric inflammation. The present study aimed to determine the di-allelic polymorphisms of TNF gene and their association with H. pylori infection and gastroduodenal diseases in Chinese population of Han nationality. METHODS: Two hundred and ten patients with gastroduodenal diseases (73 chronic gastritis, 78 duodenal ulcer, and 59 noncardia gastric cancer) and 264 healthy controls were genotyped by the PCR-RFLP method for TNF-alpha 308, lymphotoxin-alpha (LT-alpha) NcoI, and AspHI gene polymorphisms. H. pylori infection status was determined by a validated serological test. RESULTS: H. pylori infection was detected in 90.5% of 210 patients and 62.1% of 264 healthy controls (p < 0.0001; odds ratio [OR]= 5.793; 95%CI: 3.431-9.780). Frequency of LT-alphaNcoI A/G genotype in patients with noncardia gastric cancer with H. pylori infection was significantly higher than that in H. pylori-positive healthy controls (64.0%vs 46.0%; p= 0.0297; OR = 2.026; 95%CI: 1.080-3.803). There were no other associations between TNF-alpha 308, LT-alphaNcoI, and AspHI gene polymorphisms and H. pylori infection in gastroduodenal diseases. CONCLUSIONS: LT-alphaNcoI A/G heterozygous genotype was associated with H. pylori infection in patients with noncardia gastric cancer in Chinese Han population.     

Association between interleukin-1 gene polymorphisms and Helicobacter pylori infection in gastric carcinogenesis in a Chinese population

BACKGROUND AND AIM: Helicobacter pylori is a major cause of chronic gastritis and peptic ulcer disease and a definite carcinogen for gastric adenocarcinoma. However, the underlying pathogenic mechanisms are not fully understood. Interleukin-1 (IL-1) is a key cytokine involved in H. pylori-induced gastric inflammation. The present study aimed to determine polymorphisms of IL-1B and IL-1 receptor antagonist (IL-1RN) genes and their association with H. pylori infection and gastroduodenal diseases in Chinese patients. METHODS: Three hundred and ninety-nine patients with gastroduodenal diseases (129 chronic gastritis, 127 duodenal ulcer and 143 non-cardiac gastric cancer) and 264 healthy controls were genotyped for IL-1B-511 and IL-1RN gene polymorphisms by the PCR-RFLP method. H. pylori infection status was determined by a validated serological test. RESULTS: The frequency of IL-1B-511 T allele was significantly higher in H. pylori positive patients with non-cardiac gastric cancer than in both H. pylori negative patients with non-cardiac gastric cancer (60%vs 46%, P = 0.0342, OR = 1.666, 95% confidence interval [CI]: 1.045-2.656) and in healthy controls (60%vs 48%, P = 0.0071, OR = 1.665, 95%CI: 1.149-2.412). However, the polymorphism was not associated with chronic gastritis and duodenal ulcer. Multivariate logistic regression analyses identified that IL-1B-511 T/T carrier status was an independent risk factor for non-cardiac gastric cancer in the presence of H. pylori infection (adjusted OR = 3.01, 95%CI: 1.27-7.11, P = 0.01), and the frequency of IL-1B-511 T allele was an increased risk factor for developing gastric cancer (P = 0.03, adjusted OR = 2.29, 95%CI: 1.08-4.86). There was no association between IL-1RN gene polymorphisms and H. pylori infection and other gastroduodenal diseases. CONCLUSION: IL-1B-511 T allele is associated with H. pylori infection in non-cardiac gastric cancer in a Chinese population. The IL-1B-511 gene polymorphism appears to play an important role in gastric carcinogenesis in Chinese patients with H. pylori infection.     

幽门螺杆菌jhp947和cagA的检测及jhp947真核表达载体的构建

目的研究幽门螺杆菌（Helicobacter pylori,Hp）cagA和可塑区jhp947基因与胃及十二指肠疾病的关系;构建jhp947真核表达载体,为进一步研究jhp947的功能奠定基础。方法从消化性疾病患者胃粘膜活检组织中分离培养Hp,PCR分离cagA和jhp947基因,分析基因与疾病的关系;从Hp国际标准株J99中获取jhp947全长基因,克隆至pcDNA3.1/myc-HisA载体并鉴定。结果分离获得108株Hp,目的基因在胃炎、溃疡、胃癌组织中的检出率分别为：jhp9473.2%、32.2%和33.3%,cagA74.2%、93.5%和86.7%,jhp947检出率胃癌、溃疡组与胃炎组比较差异有统计学意义（χ^2值分别为12.04和8.64,P均〈0.01）。jhp947和cagA的检出率无显著相关性（P〉0.05）。经鉴定jhp947真核表达载体构建正确。结论jhp947与胃癌和消化性溃疡的发生密切相关,jhp947和cagA在致病过程中可能没有协同作用,成功构建jhp947真核表达载体。