幽门螺杆菌脂多糖诱导大鼠胃粘膜上皮细胞凋亡的研究

目的　研究幽门螺杆菌细胞脂多糖对大鼠胃粘膜上皮细胞凋亡的诱导作用 .方法　在大鼠胃内给予 2 5 ,5 0 ,10 0 ,15 0 ,2 0 0 μg幽门螺杆菌脂多糖 (Hp LPS) ,2d后取粘膜组织苏木素染色和末段脱氧核糖核酸转移酶介导的生物素化的脱氧尿嘧啶核苷三磷酸切口末段标记 (TUNEL) .结果　脂多糖在大鼠胃粘膜能引起明显的上皮细胞凋亡增加 .结论　来自于Hp的细胞脂多糖对大鼠胃上皮细胞凋亡起诱导作用 .     

深圳地区儿童幽门螺杆菌抗体检测的流行病学调查

目的为了了解和探讨深圳地区儿童幽门螺杆菌(Helicobacter pylori 简称Hp)的感染状况而开展了本次血清流行病学调查.方法采用ELISA法对2000～2004年深圳地区来儿童医院就诊患儿进行抗Hp抗体阳性检测.结果显示722例儿童血清男性儿童Hp阳性率(9.09%)和女性儿童Hp阳性率(9.72%)大致相近, 随着年龄增加阳性率也随着增加,与年龄呈正相关.深圳关外的儿童的幽门螺杆菌感染率(13.77%)明显高于深圳关内的儿童的幽门螺杆菌感染率(8.11%).深圳地区儿童幽门螺杆菌感染呈逐年上升趋势.结论 ELISA法适合于在儿童中展开Hp的流行病学调查,同时也提示深圳地区儿童幽门螺杆菌感染状况不容忽视.     

入境港澳台人员幽门螺杆菌感染的流行病学调查

目的探讨入境港澳台人员幽门螺杆菌(Hp)的感染情况,并将之与内地相应人员进行比较.方法空腹抽取外周静脉血,采用ELISA法进行血清幽门螺杆菌抗体检测.结果入境港澳台人员Hp感染率(21.26%)明显低于内地相应人员Hp感染率(31.46%)(X2=6.65,P＜0.01).结论通过职业组对照发现,货柜司机Hp感染率较高,管理者较低.随着职位的升高,有逐渐下降的趋势,与职业显著呈负相关(γ=-0.096,P＜0.05).另外,文化程度越低,Hp感染率越高,与文化程度显著负相关(入境港澳台人员:γ=-0.096,P＜0.01,内地人员:γ=-0.74,P＜0.01).     

幽门螺杆菌感染与胃肠外疾病

目的综述幽门螺杆菌(Helicobacter pylori,Hp)感染与胃肠外疾病的关系.方法对近年来的文献进行整理归纳.结果幽门螺杆菌感染不仅与慢性胃炎、消化性溃疡等密切相关而且还与某些胃肠外疾病有一定的相关性.结论幽门螺杆菌作用机制复杂,在不同的疾病中起着不同的作用,弄清幽门螺杆菌作用机制将具有重要的临床意义.     

幽门螺杆菌感染与胃肠外疾病

目的综述幽门螺杆菌(Helicobacter pylori,Hp)感染与胃肠外疾病的关系.方法对近年来的文献进行整理归纳.结果幽门螺杆菌感染不仅与慢性胃炎、消化性溃疡等密切相关而且还与某些胃肠外疾病有一定的相关性.结论幽门螺杆菌作用机制复杂,在不同的疾病中起着不同的作用,弄清幽门螺杆菌作用机制将具有重要的临床意义.     

理气和胃汤联合三联疗法在幽门螺杆菌感染胃溃疡中的临床疗效分析

研究对幽门螺杆菌感染胃溃疡患者治疗中采用理气和胃汤联合三联疗法的治疗效果。选取2017年9月～2019年9月庆阳市西峰区人民医院收治的86例幽门螺杆菌感染胃溃疡患者,依据随机数字表法将上述患者分成两组,即观察组(n=43)和对照组(n=43)。对照组给予三联疗法,观察组在三联疗法的基础上采用理气和胃汤,比较两组用药后的不良反应发生率、治疗1年内Hp根除率、溃疡复发率、治疗有效率以及症状评分。观察组的不良反应发生率和对照组的相比,无统计学差异,P0.05;观察组的胃溃疡复发率为4.65%低于对照组的20.93%;观察组的Hp根除率为93.02%高于对照组的76.74%;观察组的症状评分均低于对照组,P0.05。对幽门螺旋杆菌感染胃溃疡患者的临床治疗中采用理气和胃汤联合三联疗法,可有效改善患者的临床症状,提高Hp的根除率,降低胃溃疡的复发率,疗效显著,安全性好,值得临床借鉴。     

虾青素微胶囊对Hp小鼠血清及胃黏膜细胞因子的影响

采用幽门螺杆菌(Hp)灌胃法建立Hp感染小鼠模型，收集小鼠血清及胃组织。通过染色法观察小鼠胃黏膜内Hp定植量及病理学改变，通过酶标记测定法检测小鼠血清及胃黏膜HMGB1,IL-6,TNF-α,IL-4和IL-10的质量浓度。结果表明：与对照组相比，虾青素微胶囊(ASX-MCs)可降低小鼠胃黏膜内Hp定植量，减轻胃黏膜炎症损伤，降低血清和胃黏膜促炎因子HMGB1,IL-6,TNF-α的质量浓度，并提高抑炎因子IL-4和IL-10的质量浓度；ASX-MCs可减轻Hp感染引起的小鼠胃黏膜炎症损伤，抑制血清和胃黏膜促炎因子的表达，促进抑炎因子的表达。     

幽门螺杆菌感染对肠道菌群的影响

 为研究幽门螺杆菌(Helicobacter pylori,Hp)感染对肠道菌群的影响,收集Hp 阴性和Hp 感染(阳性)患者的粪便标本,选择Hp 和肠道菌群中具代表性的大肠杆菌O157、乳酸杆菌、肠球菌、双歧杆菌进行PCR 扩增。实验结果表明,Hp 阴性组中未见Hp 表达,与¹³C 呼气实验结果基本一致;Hp 阴性组中乳酸杆菌、肠球菌、双歧杆菌表达较高,而Hp 感染组中3 者表达较少;Hp 阴性组中未检测到大肠杆菌O157。幽门螺杆菌感染可改变肠道菌群中乳酸杆菌、肠球菌、双歧杆菌等菌落的数量。     

幽门螺杆菌感染与胃息肉的相关分析

分析幽门螺杆菌(Hp)与不同病理类型胃息肉之间的相关性。回顾性分析2016年经胃镜确诊为胃息肉的住院患者临床资料,包括镜下分型、病理分型及幽门螺杆菌感染情况。130例患者中,炎性息肉88例(占68.21%),增生性息肉33例(25.58%),胃底腺息肉7例(4.65%),低分化腺癌2例(1.55%)。胃息肉患者以41-70岁年龄组为主(80%),息肉多位于胃体、胃窦(73.08%),病理类型以炎性与增生性息肉为主(80.76%),增生性息肉与炎性息肉的好发部位差异显著。全部息肉检出患者中Hp感染60例(46.15%),其中炎性息肉47例(占Hp感染息肉患者的78.33%),与增生性息肉比较差异有统计学意义。在本组病例中,炎性息肉、增生性息肉发生率高,好发年龄为41-70岁,炎性息肉好发于胃窦,增生性息肉好发于胃体。炎性息肉患者Hp感染率高,根除Hp的治疗可能抑制炎性息肉的发生。由于本次研究的局限性,尚不具有代表性,Hp与胃息肉的相关性仍需进一步完善。     

半夏泻心汤治疗幽门螺杆菌阳性相关性胃炎98例临床研究

目的探讨半夏泻心汤治疗幽门螺杆菌阳性相关性胃炎临床疗效.方法慢性胃炎患者98例,随机分为两组,治疗组51例,给予半夏泻心汤治疗,对照组47例,给予胃苏颗粒治疗.结果治疗组临床症状总有效率达88.2%,对照组87.2%,治疗组较对照组有改善,但差异无统计学意义(P0.0 5);治疗前治疗组的Hp感染率为62.7%,治疗后Hp清除率为80.1%,治疗前后比较差异具有统计学意义(P0.05),对照组治疗前后比较差异无统计学意义(P0.05),治疗组Hp清除率明显高于对照组(P0.01).结论中药半夏泻心汤是一种有效的治疗慢性胃炎方剂,特别是治疗幽门螺杆菌阳性相关性胃炎疗效显著,值得临床推广使用.     

幽门螺杆菌感染与胃癌的关系

目的 :探讨幽门螺杆菌 (简称 Hp)感染与胃癌的关系。方法 :43例胃癌患者的新鲜癌手术标本及血清标本、36例十二提肠溃疡患者 (对照组 )的胃窦粘膜组织及血清标本入本组研究。分别采用 PCR及血清学试验检测其 Hp感染状况 ,两项检测均为阳性者即确立为 Hp感染。结果 :(1) 4 3例胃癌中 ,Hp阳性 30例 ,阳性率 6 9.77% ;36例十二指肠溃疡中 ,Hp阳性 30例 ,阳性率 83.33% ,两组阳性率相比差异无显著性。Hp阳性患者中 ,胃癌及对照组 cag A基因阳性分别为 2 4例、2 5例 ,阳性率分别为 80 .0 0 %、83.33% ,两组阳性率相比差异无显著性。(2 ) 4 3例胃癌中 ,高中分化腺癌组 Hp及 cag A检出率分别为 6 2 .5 0 %及 70 .0 0 % ,低未分化癌组 Hp及 cag A检出率分别为 74.0 7%及 85 .0 0 % ,但两组 Hp及 cag A检出率统计学上均无显著性差异。结论 :(1) Hp感染及 cag A+ 菌株感染不是胃癌发生的唯一或必须因素。 (2 )胃癌的分化程度与 Hp及cag A+菌株感染无明显相关性。     

Distribution of H.pylori antigens in gastric mucosa and its significance

Objective: To investigate the distribution of H.p),lori antigens in the gastric mucosa in patients with H.pylori infection, and the relationship between the distribution and gastric cancer. Methods: Of 112 patients confirmed by pathological study to have chronic superficial gastritis, precancerous changes (chronic atrophic gastritis, intestinal metaplasia or atypical hyperplasia) and gastric cancer, 28 were H.pylori negative and 84 were H.pylori positive. H.pylori antigens in the gastric mucosa were detected by immunohistochemistry. Results: The H.pylori positive group, comprised 12 of 22 (50.0%) in the chronic superficial gastritis group, 22 of 25 (88.0%) in the precancerous changes group and 13 of 35 (37.1%) in the gastric cancer group. The positive rates of H.pylori antigens in the cytoplasm progressively increased, respectively at 0.0% (0/12), 63.6% (14/22) and 84.6% (11/13) for the same groups (χ^2= 19.76, P=0.000); H.pylori antigens were located in the mucus layer and above the neck of the mucosal gland in 9 of 12 (75.0%) cases with chronic superficial gastritis, at the neck of the mucosal gland and the isthmus in 12 of 22 (54.5%) cases with precancerous changes, below the isthmus in 9 of 13 (69.2%) cases with gastric cancer (χ^2=25.30, P=0.000). In the H.pvlori negative group, no H.pylori antigen was observed. Conclusion: With the progression of chronic superficial gastritis→precancerous changes→gastric cancer, H.pylori antigens progressively migrated from the outer part to the inner part of the cell, and from the superficial to the deep gastric mucosa.     

幽门螺杆菌外膜蛋白与消化系疾病关系的研究

HP的全基因组序列显示,在其95个平行基因家族中存在着一个庞大的外膜蛋白(H.pylori outer membrane protein,Hop)家族,包含32种编码蛋白.这些外膜蛋白在幽门螺杆菌的诊断、保护性免疫和致病性等方面有着重要意义,与HP的定植、胃黏膜的损伤、炎性介质的分泌和中性粒细胞的浸润等有着密切的关系.     

幽门螺杆菌的流行病学研究综述

幽门螺杆菌是人类最常见的致病菌之一,与慢性胃炎、消化性溃疡、肠上皮化生、胃癌、粘膜相关性淋巴样组织（MALT）淋巴瘤等密切相关.幽门螺杆菌呈螺旋形,有鞭毛,有多种基因亚型,在世界人口中感染率达50%,在慢性胃炎和消化性溃疡患者中感染率更高.幽门螺杆菌的主要传染源是人类,可通过口-口途径、粪-口途径、医源性途径传播.幽门螺杆菌的致病因素包括毒力因子、细胞因子、免疫学因子、机体的遗传易感性等.认清幽门螺杆菌的传播过程和致病机理对于幽门螺杆菌的防治有着非常重要的意义.     

烛缸法分离培养及冷冻法保存幽门螺杆菌

目的研究幽门螺杆菌（H elicobacter py lori,H py lori）简易分离培养及保存方法,构建H py lori小型菌库。方法首先采用H py lori选择培养基,以烛缸法分离培养不同来源的标本,然后以革兰染色显微镜形态检查及生化试验鉴定为H py lori,最后把鉴定为H py lori的纯培养物,...     

Interleukin-1 polymorphisms associated with increased risk of gastric cancer

Helicobacter pylori infection is associated with a variety of clinical outcomes including gastric cancer and duodenal ulcer disease. The reasons for this variation are not clear, but the gastric physiological response is influenced by the severity and anatomical distribution of gastritis induced by H. pylori. Thus, individuals with gastritis predominantly localized to the antrum retain normal (or even high) acid secretion, whereas individuals with extensive corpus gastritis develop hypochlorhydria and gastric atrophy, which are presumptive precursors of gastric cancer. Here we report that interleukin-1 gene cluster polymorphisms suspected of enhancing production of interleukin-1-beta are associated with an increased risk of both hypochlorhydria induced by H. pylori and gastric cancer. Two of these polymorphism are in near-complete linkage disequilibrium and one is a TATA-box polymorphism that markedly affects DNA-protein interactions in vitro. The association with disease may be explained by the biological properties of interleukin-1-beta, which is an important pro-inflammatory cytokine and a powerful inhibitor of gastric acid secretion. Host genetic factors that affect interleukin-1-beta may determine why some individuals infected with H. pylori develop gastric cancer while others do not.     

德氏乳杆菌保加利亚亚种培养基及培养条件的优化

为了降低德氏乳杆菌保加利亚亚种的工业生产成本和提高发酵液的菌浓度,通过单因素试验和旋转中心组合设计（central composite design,CCD）相结合的方法优化培养基的组分和培养条件。优化后的培养基成分为:葡萄糖30 g/L、豆粕28 g/L、玉米粉14 g/L、乳清粉28 g/L、K2HPO4 3.0 g/L、柠檬酸三铵2.5 g/L、乙酸钠5 g/L、吐温-80 1.25 mL/L、MgSO4·7H2O 0.2 g/L、MnSO4·4H2O 0.0625 g/L;培养条件为:初始pH值7.1,温度37 ℃,接种量4%（体积分数）,静置培养。经优化后活菌数达到 6.07×109 CFU/mL,明显高于原MRS培养基（5.8×108 CFU/mL）,且其成本较原MRS培养基的成本降低了4000元/t。     

2型猪链球菌RevS基因敲除突变株生物学特征及致病性研究

比较2型猪链球菌(S.suis 2)ΔRevS突变株和05ZY/H33野生株生物学特性及致病性的差异.首先,通过吸光值测定和革兰染色比较△RevS突变株和05ZY/H33野生株的生长速度和菌体形态.分别对Balb/c及ICR(CD1)小鼠腹腔注射109 CFU·mL~(-1)的05ZY/H33菌液,评估两种品系小鼠对S.suis 2的易感性.分别对Balb/c小鼠腹腔注射2.5×10~9,5.0×10~8,1.0×108,2.0×10~7,4.0×10~6 CFU·mL~(-1)的05ZY/H33菌液,采用Reed法计算半数致死量.对Balb/c小鼠腹腔注射5.0×108 CFU·mL~(-1)的ΔRevS突变株和05ZY/H33野生株菌液,观察野生株和突变株对小鼠的影响.对仔猪耳缘静脉注射10~9 CFU·mL~(-1)的05ZY/H33野生株和ΔRevS突变株菌液,观察野生株和突变株对仔猪的影响.体外生物学特征分析表明,与野生株相比,突变株的生长速率和形态染色并未发现显著变化;Balb/c小鼠对S.suis 2 05ZY/H33的敏感性高于ICR(CD1)小鼠,05ZY/H33对Balb/c小鼠的LD50为4.2×10~7 CFU·mL~(-1).Balb/c小鼠攻毒试验结果显示,ΔRevS对小鼠的致病性明显减弱.仔猪攻毒试验结果显示,野生株和突变株都引发仔猪全部死亡,但ΔRevS引发仔猪死亡时间较晚.△RevS突变株保持了菌株的基本生物学特征,但对小鼠和仔猪两种动物模型的致病作用差异较大.     

Helicobacter exploits integrin for type IV secretion and kinase activation

Integrins are important mammalian receptors involved in normal cellular functions as well as pathogenesis of chronic inflammation and cancer. We propose that integrins are exploited by the gastric pathogen and type-1 carcinogen Helicobacter pylori for injection of the bacterial oncoprotein cytotoxin-associated gene A (CagA) into gastric epithelial cells. Virulent H. pylori express a type-IV secretion pilus that injects CagA into the host cell; CagA then becomes tyrosine-phosphorylated by Src family kinases. However, the identity of the host cell receptor involved in this process has remained unknown. Here we show that the H. pylori CagL protein is a specialized adhesin that is targeted to the pilus surface, where it binds to and activates integrin alpha5beta1 receptor on gastric epithelial cells through an arginine-glycine-aspartate motif. This interaction triggers CagA delivery into target cells as well as activation of focal adhesion kinase and Src. Our findings provide insights into the role of integrins in H.-pylori-induced pathogenesis. CagL may be exploited as a new molecular tool for our further understanding of integrin signalling.