IL-1B及IL-1RN基因多态性与胃癌遗传易感性的关系

目的探讨炎症因子IL-1B（T-31C和C-511T）及其拮抗基因IL-1RN基因多态性与胃癌遗传易感性的关系。方法采用病例对照研究,对经组织学确诊的胃腺癌病例180例及其年龄和性别频数匹配的对照308例,以限制性片段长度多态性（RFLP-PCR）方法进行多态性检测,比较不同基因型以及环境因素与胃癌发病风险的关系。结果IL-1B启动子区域T-31C和C-511T基因多态性呈高度连锁不平衡（D’=0.862,R^2=0.721,P=0.000）,未发现IL-1B（T-31C和C-511T）基因多态性与胃癌之间存在显著性关联,显性模型调整比值比（OR）及其95%可信区间（C I）分别为0.95（0.62-1.47）和0.85（0.55-1.31）;IL-1RN变异基因型（1/2和2/2）可增加胃癌的患病风险,但未达到统计学差异（调整OR=1.32,95%C I=0.71-2.36）;分层结果显示在幽门螺旋杆菌（H.pylori）感染组中,IL-1RN变异基因型（1/2、2/2）显著增加胃癌的患病风险（调整OR=2.03,95%C I=1.02-4.80）。结论IL-1RN基因多态性和H.pylori感染可能在胃癌的发生和发展中具有协同作用。     

IL-1B基因多态性、幽门螺旋杆菌感染和慢性萎缩性胃炎关系的研究

目的通过研究IL-1B-511基因多态性对幽门螺旋杆菌(Helicobacter pylori,H.pylori)感染后胃黏膜萎缩、慢性萎缩性胃炎的影响,探讨IL-1B基因多态性与胃癌发生的可能机制。方法(1)采用PCR-限制性长度片段多态性(RFLP)分析法检测胃癌低发区广东省普通人群192例的基因型;(2)采用酶联免疫吸附法(ELISA)检测上述人群的Hp感染率、胃蛋白酶原I(PGl)、胃蛋白酶原Ⅱ(PGII)和胃泌素(Gastrin)的浓度。结果Hp阳性者PGI/PGII显著低于Hp阴性者(P<0.01),Hp阳性的IL-1B-511T/T基因型者PGI/PGII比值显著低于C/C和T/T基因型者(P均<0.05)。血清胃泌素浓度与IL-1B-511的基因型没有明确的关系(P>0.05)。结论在胃癌低发区,IL-1B-511基因型可能增加感染H.pylori后胃黏膜萎缩、慢性萎缩性胃炎发生和发展的危险性。     

CagA阳性幽门螺杆菌感染与上胃肠道疾病关系的研究

目的探讨CagA阳性幽门螺杆菌(Hp)感染与上胃肠道病变的关系;并观察Hp根除治疗后血清中抗CagAIgG抗体水平的变化.方法808例因上胃肠道症状而接受胃镜检查的病人,同时作Hp检查.对Hp感染者用ELISA方法检测血清中抗CagAIgG抗体;阳性者予含质子泵抑制剂(PPI)三联疗法根除治疗.其中60例根除治疗失败病人和120例根除成功病人在Hp根除治疗结束3个月和6个月时复查血清中抗CagAIgG抗体水平.结果在不同临床疾病中,慢性浅表性胃炎(CSG)、慢性萎缩性胃炎(CAG)、胃溃疡(GU)、十二指肠溃疡(DU)和胃癌(GC)感染Hp的病人中抗CagAIgG抗体阳性率分别为55.4%、70.5%、83.2%、90.8%、89.7%.后4组阳性率明显高于CSG组,后3组均明显高于CAG组;在不同程度的胃粘膜病变中,CSG、CAG、肠上皮化生(IM)、非典型增生(Dys)和GC感染Hp的病人中抗CagAIgG抗体的阳性率分别为43.0%、53.8%、77.6%、88.6%、89.7%.IM、Dys和GC组均明显高于CSG和CAG组;60例根除失败者在治疗前及治疗后3个月和6个月时血清中抗CagAIgG水平分别为(72±41)U/ml,(67±36)U/ml和(69±40)U/ml,治疗前后差异无显著意义,无一例转为阴性;120例根除治疗成功者治疗后3个月和6个月血清中抗CagAIgG水平平均由(69±38)U/ml分别下降至(47±30)U/ml和(32±15)U/ml,治疗后与治疗前比较差异均有显著意义,在治疗后3个月和6个月时分别有7.5%(9/120)和19.2%(23/120)的病人抗体转为阴性.结论CagA阳性的Hp可能导致更严重的上胃肠道疾病和更严重的胃粘膜病变;Hp根除治疗后血清中抗CagAIgG抗体水平明显下降,但下降较慢,不宜作为个体监测疗效的指标.     

白细胞介素-1β及RN基因多态性与胃癌发病风险的病例对照研究

目的 探讨白细胞介素（Interleukin,IL)-1基因家族中IL-1β-31/-511位点、IL-1RN可变数目重复序列（VNTR）的多态性及其与胃癌发病风险的关系。方法 使用变性高效液相色谱（DHPLC）对来自山东省临朐县胃癌高发现场人群与北京肿瘤医院标本库部分临床标本进行病例对照研究。PCR反应扩增目的片断,DHPLC分析中,采用非变性按片段长度分离双链DNA法分析IL-1RN VNTR基因型。采用部分变性法分析IL-1β-31/-511位点基因型,结果测序证实。结果 IL-1β-31基因型多态和IL-1RN基因VNTR,在弥漫型和肠型胃癌中,均不增加胃癌发病风险。IL-1β-511位点的T携带子在高发现场组胃癌中,增高胃癌发病风险（OR=5.414,95% CI:3.038-9.647)。T携带子在肠型胃癌中增高胃癌发病风险,OR=3.833(95% CI:2.282-6.438)。男性的T携带子在弥漫型胃癌中增高胃癌发病风险OR=3.464(95%CI:1.394-8.608)。对照组分为慢性萎缩性胃炎（CAG）、肠上皮化生（IM）、异型增生（DYS）三组,IL-1β-31基因多态性、IL-1RN VNTR在不同的病变阶段中的分布差异无显著意义,IL-1β-511位点在各病变阶段的T携带子基因型分布差异也无显著意义,均可明显增加现场组胃癌的发病风险。结论 IL-1β-31基因型和IL-1RN基因VNTR不增加胃癌发病风险。IL-1β-511T基因型增加胃癌发病风险,关联持续存在于癌前病变各阶段。     

APOC3 promoter polymorphisms C-482T and T-455C are associated with the metabolic syndrome

BACKGROUND: Despite the growing epidemic of the metabolic syndrome (MetS), few studies have evaluated genetic polymorphisms associated with the MetS phenotype. One candidate, APOC3, modulates lipid and lipoprotein metabolism and the promoter polymorphisms C-482T/T-455C are associated with loss of insulin downregulation. METHODS: One hundred twenty two consecutive MetS cases were matched by age, sex and race in a 1:1 case-control design to evaluate the prevalence of common polymorphisms in the following candidate genes: APOC3, APOE, B3AR, FABP2, GNB3, LPL, and PPARalpha and PPARgamma. RESULTS: Compared to controls, MetS subjects exhibited a greater prevalence of APOC3 promoter polymorphisms. Specifically, the frequency of the variant C-482T and T-455C alleles was 70.5 and 81.9% of cases compared to 43.4 and 54.1% in controls, respectively (p <0.0001). Overall, APOC3 promoter variants were associated with a greater likelihood of MetS compared to wild type [C-482T (OR: 4.3; 95% CI: 2.2, 8.6 [p <0.0001]), T-455C (OR: 3.6; 95% CI: 2.0, 6.7 [p <0.0001])]. No material differences were identified between the other genetic variants tested and prevalence of MetS. CONCLUSIONS: These data, therefore, suggest that the APOC3 promoter polymorphisms C-482T and T-455C are associated with the MetS.     

Persistent Helicobacter pylori infection and genetic polymorphisms of the host

Helicobacter pylori (HP) infection elevates the risk of gastric diseases including peptic ulcer and gastric cancer. The infection induces inflammatory cytokines, which could work both for and against lifetime infection in the human stomach. Genetic polymorphisms of the cytokines and other related ligands, receptors, and enzymes may influence persistent HP infection. This paper summarizes studies done on the associations between anti-HP antibody seropositivity and polymorphism genotypes. To date, the associations with the polymorphisms of fucosyl transferase 2 (FUT2 or secretor gene), FUT3 (Lewis gene), interleukin 1A (IL-1A), IL-1B, IL-1RN, IL-8, IL-10, myeloperoxidase (MPO), and tumor necrosis factor A (TNF-A) and TNF-B have been reported. Polymorphisms of other related genes, CD14, CXC chemokine receptor 2 (CXCR2), IL-1RI, nuclear factor KB2 (NF-KB2), and Toll-like receptor 4 (TLR4), have the potential to influence persistent infection. Unpublished results from our datasets are reported here for all these polymorphisms except TLR4. Gene-environment interactions between these genotypes and smoking are reviewed. An effect on OR due to the involvement of unexposed subjects is demonstrated to elucidate a disadvantage in the studies done in areas where the majority of the population is not exposed to HP.     

IL-4基因多态性及幽门螺杆菌与柳州地区胃癌易感性研究

目的探讨白细胞介素4（Interleukin 4,IL-4）基因多态性和幽门螺杆菌（Helicobacter pylori,H.pylori）感染与广西柳州地区胃癌易感性的关系。方法采用前瞻性研究,用多聚酶链式反应（PCR）和半巢式聚合酶链式反应（Semi-nested PCR）对112例胃癌患者及238例慢性胃炎患者H.pylori的尿素酶B亚单位（UreB）基因和IL-4-588基因多态性进行分析。结果胃癌组H.pylori阳性率为59.8%,高于对照组的47.5%（P〈0.05）。两组患者IL-4-588各基因型（T/T型、C/T和C/C型）分布频率差异无统计学意义（χ2=0.627,P=0.73）;胃癌组含等位基因C、T者分别为的40例（17.9%）、184例（82.1%）,其分布频率与对照组的73例（15.3%）、403例（84.7%）差异无统计学意义（χ2=0.715,P=0.398）。结论 IL-4-588基因多态性与H.pylori感染之间不存在交互作用,且与广西柳州地区胃癌易感性无关。     

No association between Helicobacter pylori seropositivity and ornithine decarboxylase (ODC) A317G polymorphism, and no modification by NAD(P)H:qinone oxidoreductase 1 (NQO1) C609T

Our previous epidemiologic study reported that NAD(P)H:quinone oxidoreductase 1 (NQO1) 609C/C with full enzyme activity was a high risk genotype for Helicobacter pylori (H. pylori) seropositivity. Since NQO1 stabilizes ornithine decarboxylase (ODC), which attenuates the innate immune response through elevated polyamines, ODC functional polymorphisms may also influence H. pylori seropositivity. This study aimed to examine the association with ODC A317G polymorphism, as well as the modification by NQO1 C609T. The two polymorphisms were determined by polymerase chain reaction with confronting two-pair primers (PCR-CTPP) among 465 health checkup examinees in Nagoya. The ODC A317G genotype frequency was 35.9% for A/A, 49.3% for A/G, and 14.8% for G/G. The sex-age-adjusted odds ratio (OR) of the ODC gene for H. pylori seropositivity was not significant (OR = 1.09 for G/A and OR = 1.02 for G/G, relative to A/A). Among subjects with any NQO1 genotype, no association was observed between the ODC ploymorphism and H. pylori seropositivity. Results of the present study did not support the hypothesis that the different genetic traits in the ODC-polyamine pathway are associated with susceptibility to persistent H. pylori infection. The higher frequency of the ODC 317A allele in the Japanese population than that in the Caucasian population is firstly reported. The genetic traits through the ODC-polyamine pathway will be further investigated.     

Comparison of Helicobacter pylori prevalence in symptomatic patients in northeastern Mexico with the rest of the country: its association with gastrointestinal disease

BACKGROUND: Prevalence of Helicobacter pylori varies among different geographic regions. The aim of this study was to assess H. pylori prevalence in symptomatic patients in northeastern Mexico and its possible association of H. pylori with disease. METHODS: We studied 261 symptomatic patients (female/male 1.44, mean age 53 years) who underwent gastrointestinal endoscopy at Hospital Universitario Dr. José Eleuterio González in Monterrey, Nuevo León, Mexico. Among patients included in this study, 209 (80.1%) had nonulcer dyspepsia (NUD), 30 (11.5%) peptic ulcer disease (PUD), and 22 (8.4%) high-grade dysplasia or gastric cancer. H. pylori status was determined by histology, positive rapid urease test, culture, or IgG whole-cell anti-H. pylori. Specific IgG antibodies for CagA status were determined by ELISA as previously described. Patients were defined as infected with H. pylori by positive results of two or more diagnostic tests used. RESULTS: Overall prevalence of H. pylori was 67.8%. According to clinical presentation, gender (male) was related with gastric cancer (p <0.01) and with PUD (p <0.05). Of 177 patients infected with H. pylori, 90 (50.8%) were seropositive for CagA antigen; in addition, H. pylori CagA+ was more common in patients with PUD (77.8%) than with NUD (43.2%) (p <0.05). However, no association was found between gastric cancer patients and presence of CagA+ H. pylori strains. CONCLUSIONS: H. pylori prevalence in symptomatic patients in northeastern Mexico is as high as the prevalence reported for the entire country. We confirmed that patients with gastric cancer and PUD are more likely to be male. CagA+ strains were associated with patients who presented PUD but not gastric cancer.     

初探幽门螺杆菌与肝硬化及肝硬化并肝癌的关系

目的:初步了解肝硬化及肝硬化并发肝癌患者幽门螺杆菌(Helicobacter pylori,H.pylori)的感染情况,探讨其与肝硬化及肝硬化并发肝癌的关系.方法:应用斑点免疫金渗滤试验(DIGFA)检测101例肝硬化、42例肝硬化并发肝癌患者血清中H.pylori抗体(HpIgG),采用化学发光法检测患者血清中甲胎蛋白(AFP)定量.结果:HpIgG阳性率,肝硬化患者为42.57%,肝硬化并发肝癌患者为69.05%,肝硬化并发肝癌患者H.pylori感染率显著高于肝硬化未并发肝癌患者.乙肝病毒感染的患者HpIgG阳性率显著高于无乙肝病毒感染者,两组间有统计学差异(x2=4.164,P=0.041).AFP异常的惠者HpIgG阳性率显著高于AFP正常患者,两组间有统计学差异(x2=4.695,P=0.030).结论:H.pylori可能为肝硬化并发肝癌的危险因素之一.     

幽门螺杆菌VacA和CagA抗体与胃十二指肠疾病关系的探讨

目的 :探讨幽门螺杆菌 (HP)的VacA和CagA抗体与胃十二指肠疾病之间的关系。方法 :采用免疫印迹法检测 2 0 0例胃十二指肠疾病患者血清中的VaCA和CagA抗体。结果 :VacA和CagA抗体在 2 0 0例患者中的检出率分别为 37.0 %、73.0 % ;在慢性胃炎 (CG)、消化性溃疡 (PU)、胃癌 (GC)患者中 ,VacA和CagA抗体的阳性率分别为 33.0 % ,31.0 % ,6 2 .5 %与 6 2 .9% ,76 .1% ,96 .9%。CG组与PU组比较 ,差异无显著性 (P <0 .0 5 ) ,GC组与CG、PU组比较 ,差异有显著性 (P >0 .0 5 )。结论 :VacA和CagA抗体在不同胃十二指肠疾病中的检出率有差异 ,但不能作为区分HP感染致不同胃十二指肠疾病的单一指标。     

HP感染及根除对十二指肠球部溃疡患者IL-18水平的影响

目的探讨幽门螺杆菌(H.pylori,HP)感染及根除对十二指肠球部溃疡患者IL-18水平的影响,同时检测抗HP治疗前后抗体水平的变化.方法40例HP阳性的十二指肠球部溃疡患者,作为实验组随机分成治疗组和对照组各20例,并以20例健康体检者为体检组,观察近期疗效及HP根除情况,同时ELISA法检测HP-IgG及IL-18水平。结果HP阳性十二指肠球部溃疡患者外周血清IL-18及HP-IgG水平显著高于体检组,抗HP治疗后十二指肠球部溃疡患者的IL-18、HP-IgG抗体水平均有明显下降。结论抗HP治疗后IL-18水平的下降在十二指肠球部溃疡的治疗过程中发挥重要作用。     

TNF-α及IL-6基因多态性与胃腺癌易感性的关系

目的:探讨肿瘤坏死因子 α（TNF α）和白细胞介素 6（IL 6）基因单核苷酸多态性（SNP）与胃腺癌及幽门螺杆菌（HP）感染胃腺癌发生发展的相关性。方法:采用基因芯片技术检测65例胃腺癌患者和71例健康对照人群中TNF α 238G/A、 308G/A和IL 6 597G/A、-174G/C、-572G/C位点多态性。同时应用酶联免疫吸附试验（ELISA）测定其血清中HP IgG/IgM/IgA型抗体浓度。结果：感染HP胃腺癌患者的阳性率明显高于感染HP的对照组(P=0.007, 相对危险度［OR］=2.53，95%可信区间［95%CI］=1.28-5.24)。胃腺癌组TNF α 238GA基因型和A等位基因频率明显高于对照组(P=0.024， OR=2.44， 95%CI=1.11-5.37; P=0.039， OR=2.13， 95%CI=1.03-4.41)，在HP阳性胃腺癌组明显高于HP阴性胃腺癌(P<0.05，OR=4.53,　95%CI=1.16-17.68; P<0.05，OR=3.52,　95%CI=0.98-12.64)。胃腺癌组IL 6 572CC基因型频率明显低于对照组(P=0.014，OR=0.17，95%CI=0.04-0.81)。未见TNF α和IL 6其他位点的SNP与胃腺癌组或HP阳性胃腺癌组有任何相关性。结论：TNF 238GA基因型及其等位基因A与胃腺癌或感染HP的胃腺癌易感性相关，而IL 6 572CC基因型则能降低胃腺癌易感性。     

IL-1基因多态性与广东地区胃癌关系的研究

【目的】研究IL-1(interleukin-1)B基因+3954、-511、-31位点和IL-1受体拮抗因子基因(IL-1RN)多态性在广东地区普通人群和胃癌患者中的分布,探讨IL-1基因多态性与我国胃癌发生的关系。【方法】用PCR-限制性片段长度多态性(RFLP)分析法检测广东省192名普通人和84例胃癌患者的IL-1基因多态性。【结果】胃癌患者IL-1B-511和IL-1B-31 T基因携带者(T+)频率显著高于普通人群(78.6％vs54.7％,x~2=14.1,P<0.01,OR=3.0,95％CI 1.7-5.5和35.7％ vs 18.8％,x~2=9.2,P<0.01,OR=2.4,95％CI 1.4-4.3),而IL-1 B+3954位点T和IL-1RN2基因携带者频率在两组间无显著差异(x~2=2.1和0.6,P>0.05)。【结论】IL-1B-511和-31位点T等位基因可能与我国广东地区胃癌的发生有关。     

Genotype announcement in a genetic polymorphism study for health checkup examinees at Nagoya University Hospital

On June 9, 2003, we started free genetic tests of eight polymorphisms for health checkup examinees who attended a basic course at Nagoya University Hospital. They were informed of their genotypes within four weeks after blood donation for research purposes. The genotypes were those of alcohol dehydrogenase 2 (ADH2) Arg47His, aldehyde dehydrogenase 2 (ALDH2) Glu487Lys, NAD(P)H: quinone oxidoreductase (NQO1) C609T, glutathione S transferase M1 (GSTM1), glutathione S-transferase T1 (GSTT1), interleukin-1B (IL-1B) C-31T, and tumor necrosis factor A (TNF-A) T-1031C, angiotensin-converting enzyme (ACE) Ins/Del. In the first three months, 227 (89.4%) out of 254 examinees participated in the free tests, having been informed of the research aims, after which they consented to our use of research data. To date, there have been no complaints from the participants, indicating that the announcement of polymorphism genotypes may be accepted differently from that of hereditary disease genotypes.     

血清胃蛋白酶原、胃泌素17和幽门螺杆菌检测在胃癌前病变诊断中的价值

目的 研究血清胃蛋白酶原(PG)、胃泌素17(G17)和幽门螺杆菌(H.pylori)检测在胃癌前病变诊断中的价值.方法 ELISA法检测424例胃癌前病变患者(病例组)和646例非癌前病变患者(对照组)PG和G17水平,13C尿素呼气试验检测H.pylori,比较两组中PG和G17水平及病例组中不同萎缩程度和黏膜肠化、上皮内瘤变PG和G17变化,采用ROC曲线得出敏感指标诊断胃癌前病变的最佳临界值.结果PG和G17水平与性别、年龄、H.pylori感染相关.病例组PGII高于对照组(P=0.005),PGI/PGII比值(PGR)低于对照组(P=0.015).重度萎缩组PGI较对照组明显降低(P=0.013),PGII和G17在低级别瘤变组和高级别瘤变组较对照组明显升高,差异有统计学意义(P<0.05),PGR在萎缩、肠化、上皮内瘤变组降低差异有统计学意义(P<0.05).PGR诊断胃癌前病变的最佳临界值为8.75(灵敏度70.0%,特异度58.0%);当H.pylori阳性时,最佳临界值为7.70(灵敏度75.6%,特异度73.7%);当H.pylori阴性时,最佳临界值为9.50(灵敏度57.5%,特异度58.2%).结论 低水平PGR结合H.pylori检测在胃癌前病变诊断中有重要的临床价值,PGII和G17在上皮内瘤变组升高明显,提示可作为胃癌前病变的观察指标.     

PARP-1基因多态性与临夏回族自治州回族人群胃癌易感性的关联研究

目的探讨聚腺苷二磷酸核糖聚合酶-1(PARP-1)Val762Ala的单核苷酸多态与临夏回族自治州回族人群胃癌易感性的关系。方法采用病例-对照研究设计,研究对象为临夏回族自治州居民(20岁以上,居住满20年以上,3代无族外通婚)。分两组:胃癌组200例,均经组织学确诊。对照组210例,按年龄、性别进行匹配的无肿瘤史的健康回族志愿者。抽提血液DNA,采用聚合酶链反应-限制性片段长度多态性方法(PCR-RFLP)进行基因分型。使用ELISA(enzyme-linkedimmunosorbent assay)法检测血浆中H.pylori的IgG抗体,以检测研究对象是否有H.pylori感染。用SPSS 13.0统计软件分析试验结果。结果 PARP-1 762Val/Ala+Ala/Ala在胃癌组显著增高(OR:2.158,95%CI:1.404～3.315,P=0.020)。交互作用分析显示:家族史阳性的Val/Ala+Ala/Ala基因型患胃癌的风险是家族史阴性的Val/Val基因型的4.125倍(OR:4.125,95%CI:2.117～8.038,P=0.000);食腌菜的Val/Ala+Ala/Ala基因型患胃癌的风险是不食腌菜的Val/Val基因型的3.814倍(OR:3.814,95%CI:2.150～6.766,P=0.000);H.pylori感染阳性的Val/Ala+Ala/Ala基因型患胃癌的风险是H.pylori感染阴性Val/Val基因型的4.085倍(OR:4.085,95%CI:2.197～7.597,P=0.000)。结论 PARP-1 Val762Ala单核苷酸多态与临夏回族自治州回族人群胃癌易感性增高相关。PARP-1 Val/Ala+Ala/Ala基因型分别与家族史、食腌菜、H.pylori感染在胃癌的发病风险中存在着加乘交互效应。     

PTPN11和IL-4基因多态性及幽门螺杆菌感染与广西柳州地区胃癌易感性的研究

目的探讨蛋白酪氨酸磷酸酶非受体型11（PTPN11）和自细胞介素4（IL-4）基因多态性及幽门螺杆菌（H．pylori）感染与广西柳州地区胃癌易感性的相关性。方法研究对象为广西柳州地区238例胃癌患者及112例健康对照者,通过PCR检测H．pylori的尿素酶B亚单位（UreB）基因,两步法聚合酶链反应（PCR—CTPP）对被研究者的PTPN11基因第3内含子2460位点进行单链构象多态性分析（SNP）,同时以半巢式聚合酶链式反应（Semi—nested PER）对IL-4—588位点进行多态性分析。结果胃癌组和对照组H.pylorl（＋）者分别为142例（59．7％）和54例（48．2％）,H.pylori（-）者分别为96例（40．3％）和58例（51．8％）,H.pylori感染率在两组间差异有统计学意义（P〈0．05）。胃癌组和对照组PTPN11基因、IL-4—588基因在该位点的基因型频率分布符合遗传平衡状态且差异无统计学意义（P〉0．05）,但两组间的PT-PN11等位基因分布差异存在统计学意义（P〈0．05）。对PTPN11基因研究发现：与G／G型相比,G／A型和A／A型不能减低胃癌的发病风险;但将G／A型和A／A型合并后与G／G型相比,带有A基因的个体患胃癌的风险显著降低。对IL-4基因研究发现：与C／C型相比,C／T型和T／T型的个体患胃癌的风险在胃癌组和对照组之间均无明显差异,且在对胃癌易感性的相关分析中该位点多态性与H-pylori感染因素之间不存在交互作用。结论广西柳州地区PTPN11基因第3内含子2460位点A基因携带者能明显降低胃癌的发病风险,G／G基因型和H-pylori感染能增加胃癌的易感性,H-pylor感染与该位点G／G基因型之间存在交互作用,而IL一4—588基因多态性与广西柳州地区胃癌的发病风险无关,且在对胃癌易感性的相关分析中该位点多态性与H-pylori感染因素之间不存在交互作用。     

Epidemiological study on food intake and Helicobacter pylori infection

We conducted an epidemiological study to investigate the relation of food intake to Helicobacter pylori (H. pylori) infection in an area endemic for H. pylori. In this study, 365 subjects, 104 men and 261 women, were randomly selected from 7,389 adult (over age 20) inhabitants of town A, Japan. The prevalence of immunoglobulin G (IgG) class antibody to H. pylori (anti-H. pylori) was 83.7% and the prevalence of anti-H. pylori increased with age significantly (P < 0.05). Subjects with anamnesis of gastritis, gastroduodenal ulcer and gastric cancer tended to have a higher anti-H. pylori positive ratio (93.5%) than those without (81.0%). But there was no relationship between anti-H. pylori prevalence and sex, blood type, smoking or drinking habits. Daily intake of foods by food groups, nutrients and the concentrations of serum ingredients were compared between 37 anti-H. pylori-positive and 40 negative subjects selected from 365 inhabitants by matching up according to sex and age. The daily intake of cereals, potatoes and starches, and milks tended to be higher in positive than negative subjects, while the daily intake of algae and tea appeared to be a little higher in negative than in positive subjects. The daily zinc intake of antibody-positive subjects was significantly higher (P < 0.05) than in antibody negative subjects. On the other hand, the daily iron intake in negative subjects was significantly higher (P < 0.05) than in positive subjects. The serum concentrations of copper, zinc, and vitamin E tended to be higher in positive than negative subjects. But there were no significant differences in serum ingredients concentrations between antibody negative and positive subjects. Our findings suggest that iron and zinc intakes may effect on H. pylori infection.     

IL-10-1082位点单核苷酸多态性与我国胃癌的关系

目的 研究白细胞介素10(ID-10)基因-1082位点单核苷酸多态性在我国胃癌高发区和低发区普通人群和胃癌患者中的分布,并探讨该位点基因多态性与我国胃癌的关系.方法 用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)检测年龄和性别匹配的广东省104例普通人群及104例胃癌患者和陕西省普通人群和胃癌患者各102例的IL-10-1082位点单核苷酸多态性.采用ELISA检测血清幽门螺杆菌(Hp)IgG.结果 IL-10-1082位点A/A、A/G、G/G三种基因型在本研究人群中的分布频率为86.7%、10.7%和2.4%.在胃癌低发区,胃癌患者携带IL-10-1082 G·的频率明显高于普通人群(14.4% vs 7.7%,X2=4.02,P＜0.05,OR=1.01,95%CI=1.08～3.10),IL-10.1082 G*基因型增加Hp感染后胃癌发生的危险性(X2=5.36,P＜0.05,OR=6.0,95% CI=1.23～17.52);在胃癌高发区,胃癌患者IL-10-1082 G·基因型频率与对照组无明显差异(12.7% vs 16.6%,P＞0.05).两地区胃癌人群ID-10-1082 G·基因型频率无显著差异(12.7% vs 14.4%,X2=0.13,P＞0.05);两地区普通人群中,高发区IL-10-1082 G·基因型频率明显高于低发区(16.6% vs 7.7%,X2=4.27,P＜0.05,OR=1.29,95% CI=I.12～6.11).结论 IL-10.1082 G等位基因增加Hp感染后胃癌发生的危险性,IL-10-1082位点单核苷酸多态性可能与我国汉族人群胃癌发生有关.