AIMS The relationship between Helicobacter pylori (Hp) and gastric epithelia in chronic gastritis and in petic ulcer was studied by transmission electron mi- croscopy (TEM). METHODS Seventy-five gastric antral biopsy ...AIMS The relationship between Helicobacter pylori (Hp) and gastric epithelia in chronic gastritis and in petic ulcer was studied by transmission electron mi- croscopy (TEM). METHODS Seventy-five gastric antral biopsy speci- mens from the patients examined by six other methods for Hp were fixed in glutaraldehyde and treated with tanin acid before OsO_4 staining than routinely prooessed for TEM studies (at least 4 semi- thin sections oriented for ultrathin sections in each sample). RESULTS The bacilli were detected by TEM within gastric mucosa in 53 of 55 patients infected with Hp. Ultrathin sections especially stained with tanin acid re- vealed clearly glycocalyx by which the bacillus was connected with the epithelium. As the bacilli grouped as colony and breed,the adjacent mucous cells degerated and characterized by erosion of the juxtalu- minal cytoplasm,vacuolation or blebs,even desqua- mation of cell. Evidence was accumulated to show that the baoilli were located in the lumen attracted neu- trophils which intended to migrate into intercellular space of epithelia or into the lumen to exert the effect of Hp phagocytosis. CONCLUSIONS The sensitivity and specificity of Hp diagnosis by TEM is respectively 96% and 95%. Tanin acid is suitable for the preservation of glycocalyx of cell. The colonized bacilli,usually with the wide periplasmic pools,contributed to the spectrum degen- eration of epithelia,including mucous neck cells. If Hp infection persists,the degeneration and regeneration of mucous neck cells alternatively carried on and ultimate- ly the generative stem cells were damaged,as the result,the chronic atrophy gastritis could occure.展开更多
AIM: To evaluate whether Helicobacter pylori (H. pylori) eradication therapy benefits patients with functional dyspepsia (FD).METHODS: Randomized controlled trials (RCTs) investigating the efficacy and safety of H. py...AIM: To evaluate whether Helicobacter pylori (H. pylori) eradication therapy benefits patients with functional dyspepsia (FD).METHODS: Randomized controlled trials (RCTs) investigating the efficacy and safety of H. pylori eradication therapy for patients with functional dyspepsia published in English (up to May 2015) were identified by searching PubMed, EMBASE, and The Cochrane Library. Pooled estimates were measured using the fixed or random effect model. Overall effect was expressed as a pooled risk ratio (RR) or a standard mean difference (SMD). All data were analyzed with Review Manager 5.3 and Stata 12.0.RESULTS: This systematic review included 25 RCTs with a total of 5555 patients with FD. Twenty-three of these studies were used to evaluate the benefits of H. pylori eradication therapy for symptom improvement; the pooled RR was 1.23 (95%CI: 1.12-1.36, P < 0.0001). H. pylori eradication therapy demonstrated symptom improvement during long-term follow-up at ≥ 1 year (RR = 1.24; 95%CI: 1.12-1.37, P < 0.0001) but not during short-term follow-up at < 1 year (RR = 1.26; 95%CI: 0.83-1.92, P = 0.27). Seven studies showed no benefit of H. pylori eradication therapy on quality of life with an SMD of -0.01 (95%CI: -0.11 to 0.08, P = 0.80). Six studies demonstrated that H. pylori eradication therapy reduced the development of peptic ulcer disease compared to no eradication therapy (RR = 0.35; 95%CI: 0.18-0.68, P = 0.002). Eight studies showed that H. pylori eradication therapy increased the likelihood of treatment-related side effects compared to no eradication therapy (RR = 2.02; 95%CI: 1.12-3.65, P = 0.02). Ten studies demonstrated that patients who received H. pylori eradication therapy were more likely to obtain histologic resolution of chronic gastritis compared to those who did not receive eradication therapy (RR = 7.13; 95%CI: 3.68-13.81, P < 0.00001).CONCLUSION: The decision to eradicate H. pylori in patients with functional dyspepsia requires individual assessment.展开更多
AIM: To investigate and compare frequencies of serum positive cagA in patients from two separate regions of Turkey who were grouped according to the presence of peptic ulcer disease or non-ulcer dyspepsia.METHODS: One...AIM: To investigate and compare frequencies of serum positive cagA in patients from two separate regions of Turkey who were grouped according to the presence of peptic ulcer disease or non-ulcer dyspepsia.METHODS: One hundred and eighty Helicobacter pyloripositive patients with peptic ulcer disease or non-ulcer dyspepsia were included in the study. One hundred and fourteen patients had non-ulcer dyspepsia and 66 had peptic ulcer disease (32 with gastric ulcers and/or erosions and 34with duodenal ulcers). Each patient was tested for serum antibody to H. pylori cagA protein by enzyme immunoassay.RESULTS: The total frequency of serum positive cagA in the study group was 97.2 %. The rates in the patients with peptic ulcers and in those with non-ulcer dyspepsia were 100% and 95.6%, respectively. These results were similar to those reported in Asian studies, but higher than those that have been noted in other studies from Turkey and Western countries.CONCLUSION: The high rates of serum positive cagA in these patients with peptic ulcer disease and non-ulcer dyspepsia were similar to results reported in Asia. The fact that there was high seroum prevalence regardless of ulcer status suggests that factors other than cagA might be responsible for ulceration or other types of severe pathology in H. pylori-positive individuals.展开更多
Helicobacter pylori (H. pylori ) is a major causativebacterium of chronic gastritis, peptic ulcer and mucosaassociated lymphoid tissue lymphoma in humans, and associated with an increased risk of gastric cancer[1 -8]....Helicobacter pylori (H. pylori ) is a major causativebacterium of chronic gastritis, peptic ulcer and mucosaassociated lymphoid tissue lymphoma in humans, and associated with an increased risk of gastric cancer[1 -8]. An important virulant factor of H. pylori is the vacuolating cytotoxin ( VacA ) encoded by vacA that induces cytoplasmic vacuolation in target cells both in vitro and in vivo[9-11]. VacA is produced as a 140 kDa precursor which contains an N-terminal signal peptide and an approximately 33 kDa C-terminal outer membrance exporter. The precursor is cleaved at both N-terminal and C-terminal and secreted into the extracellular milieu as a 95 kDa mature protein. The mature protein futher undergoes specific cleavage to yield 37 kDa and 58 kDa subunits[12-14] Although vacA is present in all H. pylori strains, only about 50% to 60% of strains can induce vacuolation of epithelial cells as assessed by the HeLa cell assay. vacA shows considerable genetic variation in H. pylori isolated from all over the world and contains at least two variable regions. The s region exists as sl or s2 allelic types. Among type sl strains, subtypes sla and slb have been identified. The m region occurs as ml or m2 allelic types. Specific vacA genotype of H. pylori strains are associated with the production of the cytotoxin in vitro, epithelial damage in vivo, and clinical consequences[15-27]. The other virulant factor is the cytotoxin-associated protein (CagA) encoded by the cytotoxin-associated gene (cagA). The cagA gene is present in about 60% to 70% of strains and all of these strains express the cagA. The presence of cagA is also associated with the production of the cytotoxin in vitro, and clinical outcome[24-30]. The aim of this study was (i) to identify vacA genotypes and cagA status of H. pylori isolated from Chinese patients; (ii) to evaluation the relatioship beween vacA genotypes, cagA status and related gastroenterological disorders.展开更多
INTRODUCTIONHelicobacter pylori(Hp)infection is closely relatedto gastrointestinal hormones and involves theformation of gastritis,gastric carcinoma and pepticulcer.Its pathogenesis relevant
AIM To investigate the clinical significance of the PCR assay in the diagnosis of gastric H. pylori infection. METHODS HP infection in gastric antral biopsied specimens was identified by the polymerase chain re...AIM To investigate the clinical significance of the PCR assay in the diagnosis of gastric H. pylori infection. METHODS HP infection in gastric antral biopsied specimens was identified by the polymerase chain reaction (PCR) to amplify the specific HP urease gene fragments (PCR HP DNA) in 154 patients with gastrointestinal disorders. HP urease genes oligonucleotide primers specific for HP (16s rRNA) were used. Urease test and ELISA for serum anti HP IgG were also used as control. RESULTS PCR HP DNA was detected in 140(91%) of the 154 patients, 114 and 125 were found infected with HP by urease test and ELISA HP IgG, respectively. There was a marked difference in the HP positive rate between the PCR HP DNA and the urease test or ELISA HP IgG ( P <0 05). The rate of HP infection increased with age although a minority of infected people develop signs and symptoms of gastric disorders. HP infection is closely related to adenocarcinoma in gastric antrum and the downbody of the stomach. CLNCLUSION PCR is a sensitive and specific method for the detection of HP in human gastric tissues. Detection of HP DNA in vivo by this approach might improve the clinical diagnosis and epidemiological research of H. pylori infection.展开更多
AIM:To determine the long-term prevalence of Helicobacter pylori(H pylori)gastritis in patients after partial gastric resection due to peptic ulcer,and to compare the severity of Hpylori-positive gastritis in the corp...AIM:To determine the long-term prevalence of Helicobacter pylori(H pylori)gastritis in patients after partial gastric resection due to peptic ulcer,and to compare the severity of Hpylori-positive gastritis in the corpus mucosa between partial gastrectomy patients and matched controls. METHODS:Endoscopic biopsies were obtained from 57 patients after partial gastric resection for histological examination using hematoxylin/eosin and Warthin-Starry staining.Gastritis was graded according to the updated Sydney system.Severity of corpus gastritis was compared between Hpylori-positive partial gastrectomy patients and Hpylori-positive duodenal ulcer patients matched for age and gender. RESULTS:In partial gastrectomy patients,surgery was performed 20 years(median)prior to evaluation.In 25 patients(43.8%)Hpyloriwas detected histologically in the gastric remnant.Gastric atrophy was more common in H pylori-positive compared to H pylori-negative partial gastrectomy patients(P<0.05).The severity of corpus gastritis was significantly lower in Hpylori-positive partial gastrectomy patients compared to duodenal ulcer patients (P<0.01).There were no significant differences in the activity of gastritis,atrophy and intestinal metaplasia between the two groups. CONCLUSION:The long-term prevalence of Hpylorigastritis in the gastric corpus of patients who underwent partial gastric resection due to peptic ulcer disease is comparable to the general population.The expression of Hpylorigastritis in the gastric remnant does not resemble the gastric cancer phenotype.展开更多
Since its first isolation by Marshall and Warren, Helicobacter pylori (H. pylori) has been recognized to have a causal role in the upper gastrointestinal diseases development, especially in chronic gastritis, peptic u...Since its first isolation by Marshall and Warren, Helicobacter pylori (H. pylori) has been recognized to have a causal role in the upper gastrointestinal diseases development, especially in chronic gastritis, peptic ulcer disease, mucosa-associated lymphoid tissue (MALT lymphoma) and gastric adenocarcinoma. H. pylori is a spiral-shaped gram-negative flagellate bacterium that has a high genetic diversity, which is an important factor in its adaptation to the host stomach and also for the clinical outcome of the infection, an aspect that remains unclear. However, it is thought to involve a interplay among the virulence of the infecting strain, host genetics and environmental factors. This review chapter brings the principal characteristics of the diseases associated with H. pylori infection and summarizes some important characteristics concerning the virulence of bacterium strain, host genetics and external environment.展开更多
BACKGROUND Helicobacter pylori(H.pylori)infection is a worldwide problem with increasing burden on the health sector due to its increasing rate of resistance.The conventional triple therapy(TT)is becoming obsolete wit...BACKGROUND Helicobacter pylori(H.pylori)infection is a worldwide problem with increasing burden on the health sector due to its increasing rate of resistance.The conventional triple therapy(TT)is becoming obsolete with a high failure rate of eradication,necessitating the need for better alternatives or regimens.AIM To investigate H.pylori eradication rate of TT vs modified bismuth quadruple therapy.METHODS Ninety-two patients with dyspepsia symptoms and positive ^(13)C-urea breath test were randomly assigned to two groups.The first group(control group)was treated for 14 d using standard TT protocol:Esomeprazole(40 mg twice daily),amoxicillin(1 g twice daily)and clarithromycin(500 mg twice daily).On the other hand,the second group was prescribed a 10-d course of modified bismuth quadruple therapy fortified with zinc carnosine:TT in addition to bismuth subcitrate(240 mg twice daily)and zinc carnosine(75 mg twice daily).A repeated 13C-urea breath test was done 4 wk after the completion of the eradication therapy.RESULTS Among the 92 subjects,67.4%were males and 32.6%were females.There were no differences in demographic characteristics(age,body mass index,smoking history,previous antibiotics use and ethnicity)between the modified bismuth quadruple therapy group and TT group.The eradication rate was higher[93.5%(43/46)]in the modified bismuth quadruple therapy group compared to 69.6%(32/46)in the standard TT group(P=0.003).Of the tested predictor variables,only nationality,smoking and therapy type were statistically significant.Besides dizziness,which was recorded in modified bismuth quadruple therapy group,there were no significant differences in side effects between the two groups.CONCLUSION Ten days of modified bismuth quadruple therapy fortified with zinc carnosine is superior to 14 d of conventional TT in eradicating H.pylori infection,with no additional significant adverse events.展开更多
Background Almost half of the world’s population suffer from the Helicobacter pylori (H. pylori) infection, but only some individuals develop gastric diseases with clinical symptoms. One reason for the phenomenon may...Background Almost half of the world’s population suffer from the Helicobacter pylori (H. pylori) infection, but only some individuals develop gastric diseases with clinical symptoms. One reason for the phenomenon may be the different pathogenicity of infected H. pylori strains. The presence of cytotoxin-associated gene A (cagA) and expression of vacuolating cytotoxin activity encoded by vacuolating cytotoxin gene A (vacA) are considered the two major virulent markers of H. pylori. The aim of this study was to detect dominant cagA/vacA genotypes and coinfection frequency of H. pylori in patients with peptic ulceration (PU) or chronic gastritis (CG), and to determine correlations among different cagA/vacA genotypes, coinfection and severity of the diseases. Methods For each of 139 patients in Zhejiang Province who had been diagnosed as PU or CG based on clinical symptoms and gastroscopy, two gastric biopsy specimens (one from antrum and the other from corpus) for H. pylori isolation were taken by two different disinfected biopsy forceps. One hundred and fifty-six H. pylori strains were isolated from both the antrum and corpus biopsy specimens of 78 patients (36 PU and 42 CG). PCRs were performed to detect cagA genes, and signal (s) and middle (m) regions of vacA genes in the H. pylori isolates. The amplified fragments of dominant vacA gene s and m subtypes from representative H. pylori isolates were sequenced after TA cloning. Dominant cagA/vacA genotypes of the H. pylori isolates, coinfection frequency and correlations among the different genotypes, coinfection and severity of the diseases were determined.Results Of the H. pylori strains isolated from the antrum specimens, 96.2% were cagA gene positive, as were 97.4% of the H. pylori strains isolated from the corpus specimens. Only one s region subtype (s1a) and four m region subtypes m1, m2, m1b and m1b-m2 of vacA gene were found. The proportions of vacA gene subtypes s1a/m1, s1a/m2, s1a/m1b and s1a/m1b-m2 in the 83 strains isolated from the antrum specimens were 7.2%, 61.5%, 30.1% and 1.2%, respectively, while those in the other 84 strains isolated from the corpus specimens were 9.5%, 58.3%, 28.6% and 3.6%, respectively. s1a/m2 (58.3% vs 30.1%, χ~2=13.47, P<0.01) and then s1a/m1b (28.6% vs 9.5 %, χ~2=9.88, P<0.01) were the dominant vacA gene subtypes in the (H. pylori) isolates. The dominant H. pylori genotype was (cagA+s1a/m2 (59.0%) from antrum specimens and 57.1% from corpus specimens), and followed by cagA+s1a/m1b (28.9% from antrum specimens and 27.4% from corpus specimens). Sixteen of 78 patients (20.5%) were infected with two or three H. pylori strains with different genotypes. However, no statistically significant differences among cagA occurrence, the different vacA subtypes and PU or CG could be found (each P>0.05). Similarities of the nucleotide sequences from vacA gene s region PCR products of six isolates and from vacA gene m region PCR products of four isolates were 93.2% to 98.3% and 93.8% to 97.6%, respectively, compared to the reported corresponding sequences.Conclusions The dominant genotypes of H. pylori in PU or CG patients in Zhejiang area may be cagA+ s1a/m2 and cagA+ s1a/m1b. Numerous coinfections with different H. pylori strains in PU or CG patients indicate diversity of the infected H. pylori origins. s and m regions of vacA gene from different H. pylori isolates show high nucleotide sequence similarities. cagA gene positive rate, different vacA gene subtypes and coinfection with different H. pylori strains are not closely associated with severity of the diseases.展开更多
基金Supported by Science Foundation of Xiamen.No.95801.
文摘AIMS The relationship between Helicobacter pylori (Hp) and gastric epithelia in chronic gastritis and in petic ulcer was studied by transmission electron mi- croscopy (TEM). METHODS Seventy-five gastric antral biopsy speci- mens from the patients examined by six other methods for Hp were fixed in glutaraldehyde and treated with tanin acid before OsO_4 staining than routinely prooessed for TEM studies (at least 4 semi- thin sections oriented for ultrathin sections in each sample). RESULTS The bacilli were detected by TEM within gastric mucosa in 53 of 55 patients infected with Hp. Ultrathin sections especially stained with tanin acid re- vealed clearly glycocalyx by which the bacillus was connected with the epithelium. As the bacilli grouped as colony and breed,the adjacent mucous cells degerated and characterized by erosion of the juxtalu- minal cytoplasm,vacuolation or blebs,even desqua- mation of cell. Evidence was accumulated to show that the baoilli were located in the lumen attracted neu- trophils which intended to migrate into intercellular space of epithelia or into the lumen to exert the effect of Hp phagocytosis. CONCLUSIONS The sensitivity and specificity of Hp diagnosis by TEM is respectively 96% and 95%. Tanin acid is suitable for the preservation of glycocalyx of cell. The colonized bacilli,usually with the wide periplasmic pools,contributed to the spectrum degen- eration of epithelia,including mucous neck cells. If Hp infection persists,the degeneration and regeneration of mucous neck cells alternatively carried on and ultimate- ly the generative stem cells were damaged,as the result,the chronic atrophy gastritis could occure.
文摘AIM: To evaluate whether Helicobacter pylori (H. pylori) eradication therapy benefits patients with functional dyspepsia (FD).METHODS: Randomized controlled trials (RCTs) investigating the efficacy and safety of H. pylori eradication therapy for patients with functional dyspepsia published in English (up to May 2015) were identified by searching PubMed, EMBASE, and The Cochrane Library. Pooled estimates were measured using the fixed or random effect model. Overall effect was expressed as a pooled risk ratio (RR) or a standard mean difference (SMD). All data were analyzed with Review Manager 5.3 and Stata 12.0.RESULTS: This systematic review included 25 RCTs with a total of 5555 patients with FD. Twenty-three of these studies were used to evaluate the benefits of H. pylori eradication therapy for symptom improvement; the pooled RR was 1.23 (95%CI: 1.12-1.36, P < 0.0001). H. pylori eradication therapy demonstrated symptom improvement during long-term follow-up at ≥ 1 year (RR = 1.24; 95%CI: 1.12-1.37, P < 0.0001) but not during short-term follow-up at < 1 year (RR = 1.26; 95%CI: 0.83-1.92, P = 0.27). Seven studies showed no benefit of H. pylori eradication therapy on quality of life with an SMD of -0.01 (95%CI: -0.11 to 0.08, P = 0.80). Six studies demonstrated that H. pylori eradication therapy reduced the development of peptic ulcer disease compared to no eradication therapy (RR = 0.35; 95%CI: 0.18-0.68, P = 0.002). Eight studies showed that H. pylori eradication therapy increased the likelihood of treatment-related side effects compared to no eradication therapy (RR = 2.02; 95%CI: 1.12-3.65, P = 0.02). Ten studies demonstrated that patients who received H. pylori eradication therapy were more likely to obtain histologic resolution of chronic gastritis compared to those who did not receive eradication therapy (RR = 7.13; 95%CI: 3.68-13.81, P < 0.00001).CONCLUSION: The decision to eradicate H. pylori in patients with functional dyspepsia requires individual assessment.
文摘AIM: To investigate and compare frequencies of serum positive cagA in patients from two separate regions of Turkey who were grouped according to the presence of peptic ulcer disease or non-ulcer dyspepsia.METHODS: One hundred and eighty Helicobacter pyloripositive patients with peptic ulcer disease or non-ulcer dyspepsia were included in the study. One hundred and fourteen patients had non-ulcer dyspepsia and 66 had peptic ulcer disease (32 with gastric ulcers and/or erosions and 34with duodenal ulcers). Each patient was tested for serum antibody to H. pylori cagA protein by enzyme immunoassay.RESULTS: The total frequency of serum positive cagA in the study group was 97.2 %. The rates in the patients with peptic ulcers and in those with non-ulcer dyspepsia were 100% and 95.6%, respectively. These results were similar to those reported in Asian studies, but higher than those that have been noted in other studies from Turkey and Western countries.CONCLUSION: The high rates of serum positive cagA in these patients with peptic ulcer disease and non-ulcer dyspepsia were similar to results reported in Asia. The fact that there was high seroum prevalence regardless of ulcer status suggests that factors other than cagA might be responsible for ulceration or other types of severe pathology in H. pylori-positive individuals.
基金the National Natural Science Foundation of China,№39670648
文摘Helicobacter pylori (H. pylori ) is a major causativebacterium of chronic gastritis, peptic ulcer and mucosaassociated lymphoid tissue lymphoma in humans, and associated with an increased risk of gastric cancer[1 -8]. An important virulant factor of H. pylori is the vacuolating cytotoxin ( VacA ) encoded by vacA that induces cytoplasmic vacuolation in target cells both in vitro and in vivo[9-11]. VacA is produced as a 140 kDa precursor which contains an N-terminal signal peptide and an approximately 33 kDa C-terminal outer membrance exporter. The precursor is cleaved at both N-terminal and C-terminal and secreted into the extracellular milieu as a 95 kDa mature protein. The mature protein futher undergoes specific cleavage to yield 37 kDa and 58 kDa subunits[12-14] Although vacA is present in all H. pylori strains, only about 50% to 60% of strains can induce vacuolation of epithelial cells as assessed by the HeLa cell assay. vacA shows considerable genetic variation in H. pylori isolated from all over the world and contains at least two variable regions. The s region exists as sl or s2 allelic types. Among type sl strains, subtypes sla and slb have been identified. The m region occurs as ml or m2 allelic types. Specific vacA genotype of H. pylori strains are associated with the production of the cytotoxin in vitro, epithelial damage in vivo, and clinical consequences[15-27]. The other virulant factor is the cytotoxin-associated protein (CagA) encoded by the cytotoxin-associated gene (cagA). The cagA gene is present in about 60% to 70% of strains and all of these strains express the cagA. The presence of cagA is also associated with the production of the cytotoxin in vitro, and clinical outcome[24-30]. The aim of this study was (i) to identify vacA genotypes and cagA status of H. pylori isolated from Chinese patients; (ii) to evaluation the relatioship beween vacA genotypes, cagA status and related gastroenterological disorders.
文摘INTRODUCTIONHelicobacter pylori(Hp)infection is closely relatedto gastrointestinal hormones and involves theformation of gastritis,gastric carcinoma and pepticulcer.Its pathogenesis relevant
文摘AIM To investigate the clinical significance of the PCR assay in the diagnosis of gastric H. pylori infection. METHODS HP infection in gastric antral biopsied specimens was identified by the polymerase chain reaction (PCR) to amplify the specific HP urease gene fragments (PCR HP DNA) in 154 patients with gastrointestinal disorders. HP urease genes oligonucleotide primers specific for HP (16s rRNA) were used. Urease test and ELISA for serum anti HP IgG were also used as control. RESULTS PCR HP DNA was detected in 140(91%) of the 154 patients, 114 and 125 were found infected with HP by urease test and ELISA HP IgG, respectively. There was a marked difference in the HP positive rate between the PCR HP DNA and the urease test or ELISA HP IgG ( P <0 05). The rate of HP infection increased with age although a minority of infected people develop signs and symptoms of gastric disorders. HP infection is closely related to adenocarcinoma in gastric antrum and the downbody of the stomach. CLNCLUSION PCR is a sensitive and specific method for the detection of HP in human gastric tissues. Detection of HP DNA in vivo by this approach might improve the clinical diagnosis and epidemiological research of H. pylori infection.
文摘AIM:To determine the long-term prevalence of Helicobacter pylori(H pylori)gastritis in patients after partial gastric resection due to peptic ulcer,and to compare the severity of Hpylori-positive gastritis in the corpus mucosa between partial gastrectomy patients and matched controls. METHODS:Endoscopic biopsies were obtained from 57 patients after partial gastric resection for histological examination using hematoxylin/eosin and Warthin-Starry staining.Gastritis was graded according to the updated Sydney system.Severity of corpus gastritis was compared between Hpylori-positive partial gastrectomy patients and Hpylori-positive duodenal ulcer patients matched for age and gender. RESULTS:In partial gastrectomy patients,surgery was performed 20 years(median)prior to evaluation.In 25 patients(43.8%)Hpyloriwas detected histologically in the gastric remnant.Gastric atrophy was more common in H pylori-positive compared to H pylori-negative partial gastrectomy patients(P<0.05).The severity of corpus gastritis was significantly lower in Hpylori-positive partial gastrectomy patients compared to duodenal ulcer patients (P<0.01).There were no significant differences in the activity of gastritis,atrophy and intestinal metaplasia between the two groups. CONCLUSION:The long-term prevalence of Hpylorigastritis in the gastric corpus of patients who underwent partial gastric resection due to peptic ulcer disease is comparable to the general population.The expression of Hpylorigastritis in the gastric remnant does not resemble the gastric cancer phenotype.
文摘Since its first isolation by Marshall and Warren, Helicobacter pylori (H. pylori) has been recognized to have a causal role in the upper gastrointestinal diseases development, especially in chronic gastritis, peptic ulcer disease, mucosa-associated lymphoid tissue (MALT lymphoma) and gastric adenocarcinoma. H. pylori is a spiral-shaped gram-negative flagellate bacterium that has a high genetic diversity, which is an important factor in its adaptation to the host stomach and also for the clinical outcome of the infection, an aspect that remains unclear. However, it is thought to involve a interplay among the virulence of the infecting strain, host genetics and environmental factors. This review chapter brings the principal characteristics of the diseases associated with H. pylori infection and summarizes some important characteristics concerning the virulence of bacterium strain, host genetics and external environment.
文摘BACKGROUND Helicobacter pylori(H.pylori)infection is a worldwide problem with increasing burden on the health sector due to its increasing rate of resistance.The conventional triple therapy(TT)is becoming obsolete with a high failure rate of eradication,necessitating the need for better alternatives or regimens.AIM To investigate H.pylori eradication rate of TT vs modified bismuth quadruple therapy.METHODS Ninety-two patients with dyspepsia symptoms and positive ^(13)C-urea breath test were randomly assigned to two groups.The first group(control group)was treated for 14 d using standard TT protocol:Esomeprazole(40 mg twice daily),amoxicillin(1 g twice daily)and clarithromycin(500 mg twice daily).On the other hand,the second group was prescribed a 10-d course of modified bismuth quadruple therapy fortified with zinc carnosine:TT in addition to bismuth subcitrate(240 mg twice daily)and zinc carnosine(75 mg twice daily).A repeated 13C-urea breath test was done 4 wk after the completion of the eradication therapy.RESULTS Among the 92 subjects,67.4%were males and 32.6%were females.There were no differences in demographic characteristics(age,body mass index,smoking history,previous antibiotics use and ethnicity)between the modified bismuth quadruple therapy group and TT group.The eradication rate was higher[93.5%(43/46)]in the modified bismuth quadruple therapy group compared to 69.6%(32/46)in the standard TT group(P=0.003).Of the tested predictor variables,only nationality,smoking and therapy type were statistically significant.Besides dizziness,which was recorded in modified bismuth quadruple therapy group,there were no significant differences in side effects between the two groups.CONCLUSION Ten days of modified bismuth quadruple therapy fortified with zinc carnosine is superior to 14 d of conventional TT in eradicating H.pylori infection,with no additional significant adverse events.
文摘Background Almost half of the world’s population suffer from the Helicobacter pylori (H. pylori) infection, but only some individuals develop gastric diseases with clinical symptoms. One reason for the phenomenon may be the different pathogenicity of infected H. pylori strains. The presence of cytotoxin-associated gene A (cagA) and expression of vacuolating cytotoxin activity encoded by vacuolating cytotoxin gene A (vacA) are considered the two major virulent markers of H. pylori. The aim of this study was to detect dominant cagA/vacA genotypes and coinfection frequency of H. pylori in patients with peptic ulceration (PU) or chronic gastritis (CG), and to determine correlations among different cagA/vacA genotypes, coinfection and severity of the diseases. Methods For each of 139 patients in Zhejiang Province who had been diagnosed as PU or CG based on clinical symptoms and gastroscopy, two gastric biopsy specimens (one from antrum and the other from corpus) for H. pylori isolation were taken by two different disinfected biopsy forceps. One hundred and fifty-six H. pylori strains were isolated from both the antrum and corpus biopsy specimens of 78 patients (36 PU and 42 CG). PCRs were performed to detect cagA genes, and signal (s) and middle (m) regions of vacA genes in the H. pylori isolates. The amplified fragments of dominant vacA gene s and m subtypes from representative H. pylori isolates were sequenced after TA cloning. Dominant cagA/vacA genotypes of the H. pylori isolates, coinfection frequency and correlations among the different genotypes, coinfection and severity of the diseases were determined.Results Of the H. pylori strains isolated from the antrum specimens, 96.2% were cagA gene positive, as were 97.4% of the H. pylori strains isolated from the corpus specimens. Only one s region subtype (s1a) and four m region subtypes m1, m2, m1b and m1b-m2 of vacA gene were found. The proportions of vacA gene subtypes s1a/m1, s1a/m2, s1a/m1b and s1a/m1b-m2 in the 83 strains isolated from the antrum specimens were 7.2%, 61.5%, 30.1% and 1.2%, respectively, while those in the other 84 strains isolated from the corpus specimens were 9.5%, 58.3%, 28.6% and 3.6%, respectively. s1a/m2 (58.3% vs 30.1%, χ~2=13.47, P<0.01) and then s1a/m1b (28.6% vs 9.5 %, χ~2=9.88, P<0.01) were the dominant vacA gene subtypes in the (H. pylori) isolates. The dominant H. pylori genotype was (cagA+s1a/m2 (59.0%) from antrum specimens and 57.1% from corpus specimens), and followed by cagA+s1a/m1b (28.9% from antrum specimens and 27.4% from corpus specimens). Sixteen of 78 patients (20.5%) were infected with two or three H. pylori strains with different genotypes. However, no statistically significant differences among cagA occurrence, the different vacA subtypes and PU or CG could be found (each P>0.05). Similarities of the nucleotide sequences from vacA gene s region PCR products of six isolates and from vacA gene m region PCR products of four isolates were 93.2% to 98.3% and 93.8% to 97.6%, respectively, compared to the reported corresponding sequences.Conclusions The dominant genotypes of H. pylori in PU or CG patients in Zhejiang area may be cagA+ s1a/m2 and cagA+ s1a/m1b. Numerous coinfections with different H. pylori strains in PU or CG patients indicate diversity of the infected H. pylori origins. s and m regions of vacA gene from different H. pylori isolates show high nucleotide sequence similarities. cagA gene positive rate, different vacA gene subtypes and coinfection with different H. pylori strains are not closely associated with severity of the diseases.
