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Kienesberger S, Perez-Perez GI, Rivera-Correa JL, Tosado-Acevedo R, Li H, Dubois A, Gonzalez-Martinez JA, Dominguez-Bello MG, Blaser MJ. Serologic host response to Helicobacter pylori and Campylobacter jejuni in socially housed Rhesus macaques (Macaca mulatta). Gut Pathog 2012; 4:9. [PMID: 22920270 PMCID: PMC3499398 DOI: 10.1186/1757-4749-4-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Accepted: 08/17/2012] [Indexed: 01/01/2023] Open
Abstract
Background Helicobacter pylori are successful colonizers of the human gastric mucosa. Colonization increases the risk of peptic ulcer disease and adenocarcinoma. However, potential benefits of H. pylori colonization include protection against early-onset asthma and against gastrointestinal infections. Campylobacter jejuni are a leading cause of bacterial diarrhea and complications include Guillain-Barré syndrome. Here, we describe the development of reliable serological assays to detect antibodies against those two bacteria in Rhesus macaques and investigated their distribution within a social group of monkeys. Methods Two cohorts of monkeys were analyzed. The first cohort consisted of 30 monkeys and was used to establish an enzyme-linked immunosorbent assay (ELISA) for H. pylori antibodies detection. To evaluate colonization of those macaques, stomach biopsies were collected and analyzed for the presence of H. pylori by histology and culture. C. jejuni ELISAs were established using human serum with known C. jejuni antibody status. Next, plasma samples of the 89 macaques (Cohort 2) were assayed for antibodies and then statistically analyzed. Results An H. pylori IgG ELISA, which was 100% specific and 93% sensitive, was established. In contrast, the IgA ELISA was only 82% specific and 61% sensitive. The CagA IgG assay was 100% sensitive and 61% of the macaques were positive. In cohort 2, 62% macaques were H. pylori sero-positive and 52% were CagA positive. The prevalence of H. pylori IgG and CagA IgG increased with monkey age as described for humans. Of the 89 macaques 52% showed IgG against C. jejuni but in contrast to H. pylori, the sero-prevalence was not associated with increasing age. However, there was a drop in the IgG (but not in IgA) mean values between infant and juvenile macaques, similar to trends described in humans. Conclusions Rhesus macaques have widespread exposure to H. pylori and C. jejuni, reflecting their social conditions and implying that Rhesus macaques might provide a model to study effects of these two important human mucosal bacteria on a population.
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Holmes KP, Fang JC, Jackson BR. Cost-effectiveness of six strategies for Helicobacter pylori diagnosis and management in uninvestigated dyspepsia assuming a high resource intensity practice pattern. BMC Health Serv Res 2010; 10:344. [PMID: 21176158 PMCID: PMC3022876 DOI: 10.1186/1472-6963-10-344] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Accepted: 12/21/2010] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Initial assessment of dyspepsia often includes noninvasive testing for Helicobacter pylori infection. Commercially available tests vary widely in cost and accuracy. Although there is extensive literature on the cost-effectiveness of H. pylori treatment, there is little information comparing the cost-effectiveness of various currently used, noninvasive testing strategies. METHODS A Markov simulation was used to calculate cost per symptom-free year and cost per correct diagnosis. Uncertainty in outcomes was estimated using probabilistic sensitivity analysis. RESULTS Under the baseline assumptions, cost per symptom-free year was $122 for empiric proton pump inhibitor (PPI) trial, and costs for the noninvasive test strategies ranged from $123 (stool antigen) to $129 (IgG/IgA combined serology). Confidence intervals had significant overlap. CONCLUSIONS Under our assumptions for how testing for H. pylori infection is employed in United States medical practice, the available noninvasive tests all have similar cost-effectiveness between one another as well as with empiric PPI trial.
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Sasidharan S, Uyub AM. Antibody Response toHelicobacter pyloriExcretory Antigen and the Cross Reaction Study. J Immunoassay Immunochem 2008; 30:70-81. [DOI: 10.1080/15321810802569477] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Goebel A, Buhner S, Schedel R, Lochs H, Sprotte G. Altered intestinal permeability in patients with primary fibromyalgia and in patients with complex regional pain syndrome. Rheumatology (Oxford) 2008; 47:1223-7. [PMID: 18540025 DOI: 10.1093/rheumatology/ken140] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES The pain intensity of patients with FM has recently been reported to be correlated with the degree of small intestinal bacterial overgrowth (SIBO). SIBO is often associated with an increased intestinal permeability (IP). Increased IP, if shown in FM, may have pathogenetic relevance because it leads to the exposure of immune cells to luminal antigens and consequent immune modulation. It is currently unknown whether IP is altered in FM. We therefore examined the IP in a group of patients with primary FM and in two control groups, healthy volunteers and patients with an unrelated chronic pain syndrome, complex regional pain syndrome (CRPS). We hypothesized that patients with FM, but not volunteers or those patients with CRPS, would have altered IP. METHODS Both gastroduodenal and small IP were assessed using an established three-sugar test, where urinary disaccharide excretion reflecting intestinal uptake was measured using HPLC. RESULTS Forty patients with primary FM, 57 age- and sex-matched volunteers and 17 patients with CRPS were enrolled in this study. In the FM group, 13 patients had raised gastroduodenal permeability and 15 patients had raised small intestinal permeability, but only one volunteer had increased gastroduodenal permeability (P < 0.0001, chi-square test for the three groups). The IP values were significantly increased in the patient groups (P < 0.0003 for all comparisons, one-way analysis of variance). CONCLUSIONS The IPs in primary FM and, unexpectedly, CRPS are increased. This study should stimulate further research to determine the implication of altered IP in the disease pathophysiology of FM and CRPS.
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Affiliation(s)
- A Goebel
- Pain Management Centre, University Hospital Wuerzburg, Germany.
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Yang KC, Chu A, Liao CS, Lin YM, Wang GM. Evaluation of the role of H pylori infection in pathogenesis of gastric cancer by immunoblot assay. World J Gastroenterol 2006; 12:7029-32. [PMID: 17109500 PMCID: PMC4087349 DOI: 10.3748/wjg.v12.i43.7029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To elucidate the different serological reactions to H pylori using the immunoblotting technique for further understanding of its pathogenic role in gastric cancer.
METHODS: A total of 54 patients were divided into two groups after upper gastrointestinal endoscopy: normal control group (25 patients) and gastric cancer group (29 patients). Both groups were further divided into H pylori (+) and H pylori (-) subgroups based on the results of CLO test, Giemsa staining and culture. Sera were further analyzed with the immunoblotting technique (HelicoBlot 2.0, Genelabs Diagnostics, Singapore).
RESULTS: The positive rate of the immunoblotting test was as high as 88.9% in the H pylori (-) gastric cancer group and only 14.3% in the H pylori (-) normal control group with a statistically significant difference.
CONCLUSION: The prevalence of H pylori infection is higher in gastric cancer patients than in the normal controls, suggesting that H pylori may play a role in the pathogenesis of gastric cancer.
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Affiliation(s)
- Kuo-Ching Yang
- Division of Gastroenterology, Department of Internal Medicine, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan, China
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VOLLAARD A, VERSPAGET H, ALI S, VISSER L, VEENENDAAL R, VAN ASTEN H, WIDJAJA S, SURJADI CH, VAN DISSEL J. Helicobacter pylori infection and typhoid fever in Jakarta, Indonesia. Epidemiol Infect 2006; 134:163-70. [PMID: 16409664 PMCID: PMC2870371 DOI: 10.1017/s0950268805004875] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/13/2005] [Indexed: 12/17/2022] Open
Abstract
We evaluated the association between typhoid fever and Helicobacter pylori infection, as the latter microorganism may influence gastric acid secretion and consequently increase susceptibility to Salmonella typhi infection. Anti-H. pylori IgG and IgA antibody titres (ELISA) and gastrin concentration (RIA) were determined in the plasma of 87 blood culture-confirmed typhoid fever cases (collected after clinical recovery) and 232 random healthy controls without a history of typhoid fever, in the Jatinegara district, Jakarta. Patients with typhoid fever more often than controls were seropositive for H. pylori IgG (67% vs. 50%, P<0.008), when antibody titres were dichotomized around median titres observed in controls. H. pylori IgA seropositivity was not associated with typhoid fever. Plasma gastrin concentrations indicative of hypochlorhydria (i.e. gastrin > or =25 or > or =100 ng/l) were not significantly elevated in typhoid fever cases compared to controls (P=0.54 and P=0.27 respectively). In a multivariate analysis, typhoid fever was independently associated with young age (<33 years, median age of the controls) [odds ratio (OR) 7.93, 95% confidence interval (CI) 3.90-16.10], and H. pylori IgG seropositivity (OR 1.93, 95% CI 1.10-3.40). Typhoid fever was independently associated with H. pylori IgG seropositivity, but not with elevated gastrin concentration. Therefore, the association suggests a common risk of environmental exposure to both bacteria, e.g. poor hygiene, rather than a causal relationship via reduced gastric acid production.
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Affiliation(s)
- A. M. VOLLAARD
- Department of Infectious Diseases, Leiden University Medical Center, The Netherlands
| | - H. W. VERSPAGET
- Department of Gastroenterology–Hepatology, Leiden University Medical Center, The Netherlands
| | - S. ALI
- Department of Biology, Medical Faculty Atma Jaya Catholic University, Jakarta, Indonesia
| | - L. G. VISSER
- Department of Infectious Diseases, Leiden University Medical Center, The Netherlands
| | - R. A. VEENENDAAL
- Department of Gastroenterology–Hepatology, Leiden University Medical Center, The Netherlands
| | - H. A. G. H. VAN ASTEN
- Institute for International Health, Nijmegen University Medical Center, The Netherlands
| | - S. WIDJAJA
- Department of Internal Medicine, Medical Faculty Atma Jaya Catholic University, Jakarta, Indonesia
| | - CH. SURJADI
- Center for Health Research, Medical Faculty Atma Jaya Catholic University, Jakarta, Indonesia
| | - J. T. VAN DISSEL
- Department of Infectious Diseases, Leiden University Medical Center, The Netherlands
- Author for correspondence: J. T. van Dissel, M.D., Ph.D., Department of Infectious Diseases, C5-P, Leiden University Medical Center, PO Box 9600, 2300 RC, Leiden, The Netherlands. ()
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Schmidt-Ott R, Brass F, Scholz C, Werner C, Groß U. Improved serodiagnosis of Campylobacter jejuni infections using recombinant antigens. J Med Microbiol 2005; 54:761-767. [PMID: 16014430 DOI: 10.1099/jmm.0.46040-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Campylobacter jejuni is a frequent cause of infectious diarrhoea and is increasingly recognized as a trigger for late-onset complications. The poor standardization of commonly used serological tests might explain the conflicting results regarding the frequency of antecedent C. jejuni infections in defined patient groups. In order to obtain reliable epidemiological data as to the role of C. jejuni in causing late-onset complications, a highly specific and sensitive diagnostic tool for the epidemiological investigation of C. jejuni-associated diseases was developed. It was shown that recombinant proteins encoded by the C. jejuni genes cj0017 (P39) and cj0113 (P18) are specifically recognized by antibodies in sera from patients with C. jejuni enteritis. An ELISA using recombinant P18 and P39 as antigens was 91.9% sensitive and 99.0% specific, with positive and negative predictive values of 97.1% and 97.0%, respectively, comparing favourably with the 27.0% sensitivity of a routinely used serological assay.
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Affiliation(s)
- Ruprecht Schmidt-Ott
- Institute of Medical Microbiology1 and Department for Medical Statistics2, University of Göttingen, D-37075 Göttingen, Germany
| | - Felicitas Brass
- Institute of Medical Microbiology1 and Department for Medical Statistics2, University of Göttingen, D-37075 Göttingen, Germany
| | - Christiane Scholz
- Institute of Medical Microbiology1 and Department for Medical Statistics2, University of Göttingen, D-37075 Göttingen, Germany
| | - Carola Werner
- Institute of Medical Microbiology1 and Department for Medical Statistics2, University of Göttingen, D-37075 Göttingen, Germany
| | - Uwe Groß
- Institute of Medical Microbiology1 and Department for Medical Statistics2, University of Göttingen, D-37075 Göttingen, Germany
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Rocha AMC, Rocha GA, Leite JL, Lisboa RLL, Silva PVO, Queiroz DMM. Immunoblotting for the serodiagnosis of Helicobacter pylori infection in Brazilian patients with and without gastric carcinoma. Mem Inst Oswaldo Cruz 2004; 99:189-93. [PMID: 15250474 DOI: 10.1590/s0074-02762004000200013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We evaluated the performance of a commercial immunoblotting in the serodiagnosis of Helicobacter pylori infection in Brazilian patients. The presence of anti-H. pylori antibodies was also investigated in a group of 20 duodenal ulcer patients after successful treatment. One hundred and ninety one patients were studied. Among the 164 infected patients, 46 had gastric carcinoma. The duodenal ulcer patients were treated with antimicrobial drugs and the eradication of the microorganism was confirmed in all of them one month after the end of the treatment by the 13C-urea breath test. Sera were assayed for H. pylori antibodies using the Helicoblot 2.0 (Genelabs Diagnostics, Singapore). The sensitivity, specificity, positive, and negative predictive values of the test were 93.9%, 92.6%, 98.7%, and 71.4%, respectively. The sensitivity of the test was similar in patients with (93.5%) and without (95.7%) gastric carcinoma. Twenty-four months after the end of the treatment, the band of 116 kDa was still detected in one of the patients. In conclusion, the Helicoblot 2.0 is an accurate test to diagnose H. pylori infection and although it can not be employed to monitor the bacterium eradication, it may be useful for diagnosing past infection, especially in gastric carcinoma patients.
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Affiliation(s)
- Andreia M C Rocha
- Laboratório de Bacteriologia, Faculdade de Medicina, Universidade Federal de Minas Gerais. Av. Alfredo Balena, 190/4026, 30130-100 Belo Horizonte, MG, Brasil
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Oleastro M, Matos R, Cabral J, Barros R, Lopes AI, Ramalho P, Monteiro L. Evaluation of a Western blot test, Helico blot 2.1, in the diagnosis of Helicobacter pylori infection in a pediatric population. Helicobacter 2002; 7:210-5. [PMID: 12047328 DOI: 10.1046/j.1523-5378.2002.00083.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Noninvasive diagnostic tests are useful as screening tools for Helicobacter pylori infection in pediatric populations. The aim of this study was to evaluate performance of the immunoblot assay, Helico Blot 2.1, for the diagnosis of H. pylori infection in symptomatic children. MATERIALS AND METHODS Immunoblot assay was used for detection of IgG antibodies to specific H. pylori proteins and to a recombinant H. pylori antigen, CIM marker. The study was performed on sera collected from 134 symptomatic, untreated children (mean age, 9.1 +/- 3.2 years; range, 1-14 years). H. pylori infection status was determined by culture, histology and rapid urease test. RESULTS Immunoblot assay yielded a positive result in 71 of the 72 infected patients (sensitivity 98.6%) and in eight of the 62 noninfected ones (specificity 87.1%). The predictive values for a positive and a negative result were 89.9% and 98.2%, respectively. The performance of the CIM band alone, as a marker for H. pylori infection status, was also evaluated. This band was present on the blot of 71 infected patients and on four of the 62 H. pylori-negative patients. The sensitivity, specificity, PPV and NPV of the CIM antigen were 98.6%, 93.5%, 94.7% and 98.3%, respectively. CONCLUSIONS The immunoblot assay Helico Blot 2.1 is a suitable noninvasive test for the serodiagnosis of H. pylori infection in children. The good level of performance demonstrated by the novel recombinant antigen CIM suggests it may be a useful contribution to the qualitative and quantitative performance of the Helico Blot 2.1 in pediatric populations.
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Affiliation(s)
- Mónica Oleastro
- Laboratório de Bacteriologia, Instituto Nacional de Saúde, Lisbon, Portugal
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Atanassov C, Pezennec L, d'Alayer J, Grollier G, Picard B, Fauchère JL. Novel antigens of Helicobacter pylori correspond to ulcer-related antibody pattern of sera from infected patients. J Clin Microbiol 2002; 40:547-52. [PMID: 11825970 PMCID: PMC153369 DOI: 10.1128/jcm.40.2.547-552.2002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Recently, we reported that the patterns of antibodies to Helicobacter pylori protein antigens in serum may be useful for screening patients at high risk for ulcers (P. Aucher et al., J. Clin. Microbiol. 36:931-936, 1998). Here we report the identification, by a combination of electrophoretic, immunochemical, and protein sequencing methods, of five antigens that correspond to this antibody pattern: groEL, catalase A, flagellin A, beta-ketoacyl-acyl carrier protein synthase I (beta-ketoacyl-ACP S), and peptidyl prolyl cis-trans isomerase (PPiase). Beta-Ketoacyl-ACP S and PPiase are reported for the first time as antigens of diagnostic interest in infections by H. pylori. The antigenicity of the five antigens, together with those of CagA and VacA, was tested in an immunoblot assay with water-soluble protein extracts from two H. pylori pathogenic strains (HP 141 and ATCC 43579) and panels of sera from H. pylori-positive patients with gastroduodenal ulcers (GDU), nonulcer dyspepsia (NUD), as well as sera from H. pylori-negative healthy volunteers. For catalase A, groEL, and flagellin A antigens, no overall statistically important values were found making it possible to discriminate between patients with GDU and NUD. For both H. pylori strains, the mean performance indices (MPI) presenting percentages of correctly classified patients with GDU and NUD showed that the most significant antibody patterns were as follows: anti-VacA + anti-beta-ketoacyl-ACP S (MPI = 76.1), anti-VacA + anti-PPiase (MPI = 71.8), and anti-CagA + anti-VacA + anti-beta-ketoacyl-ACP S (MPI = 70.5). Antibody patterns detected with these antigen profiles may therefore be useful in developing a diagnostic test designed to predict the clinical severity of the H. pylori infection within the adult population of France.
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Affiliation(s)
- Christo Atanassov
- Department of Microbiology A, IFR 59, University Hospital Center, 86021 Poitiers, France.
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Nessa J, Chart H, Owen RJ, Drasar B. Human serum antibody response to Helicobacter pylori whole cell antigen in an institutionalized Bangladeshi population. J Appl Microbiol 2001; 90:68-72. [PMID: 11155124 DOI: 10.1046/j.1365-2672.2001.01216.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS To use a commercial ELISA kit and an immunoblot assay to investigate the antibody levels of selected members of the Bangladeshi population to Helicobacter pylori protein antigens. METHODS AND RESULTS Using immunoblotting, high seroprevalence rates were observed in all age groups, although the subjects within the 1-9 years age group had the highest seroprevalence of antibodies to H. pylori antigens. By ELISA, the highest level of seroprevalence was observed in those over the age of 20 years. CONCLUSION On the basis of these results the overall prevalence rate of H. pylori infection for the whole population was 77.4%; 77.9% for orphan boys and 76% for carers. CagA antibodies were detected in 86% of those with high levels of antibodies to H. pylori antigens. SIGNIFICANCE AND IMPACT OF THE STUDY A combination of immunoblotting and ELISA was the most efficient means of detecting serum antibodies to H. pylori antigens and could be applied to the screening of human sera for H. pylori-specific antibodies.
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Affiliation(s)
- J Nessa
- Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
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Rocha GA, Oliveira AM, Queiroz DM, Carvalho AS, Nogueira AM. Immunoblot analysis of humoral immune response to Helicobacter pylori in children with and without duodenal ulcer. J Clin Microbiol 2000; 38:1777-81. [PMID: 10790098 PMCID: PMC86586 DOI: 10.1128/jcm.38.5.1777-1781.2000] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Several studies have demonstrated that enzyme-linked immunosorbent assay is not a sensitive and specific method to diagnose Helicobacter pylori infection in children, especially in the younger ones. Since serum immune response can also be determined by immunoblotting and it permits the detection of antibodies to virulence factors such as CagA and VacA, we evaluated the accuracy of a commercial immunoblotting test to diagnose H. pylori infection and to assess the humoral immune response to different H. pylori antigens in 122 children who underwent upper gastrointestinal endoscopy. The presence of H. pylori was determined in antral biopsy specimens by culture, preformed urease test, and histological analysis. H. pylori was identified by microbiological and histopathological methods in 66 children (including all of the 21 who had duodenal ulcer). Antibodies to H. pylori were detected in 63 infected children and in 8 noninfected ones. The sensitivity, specificity, and positive and negative predictive values of the immunoblotting test were 95.5, 85.7, 88.7, and 94.1%, respectively. The number of immunoreactive bands increased with age (P = 0.003), and the bands of 35 kDa (P = 0.013); 89 kDa, the VacA antigen (P = 0.001); and 116 kDa, the CagA antigen (P = 0.00004) were more frequently observed in older children. The frequency of the bands of 89 kDa (P = 0.001) and 116 kDa (P = 0.03) was higher in children with duodenal ulcer than in H. pylori-positive children without the disease. In conclusion, the immunoblotting test appears to be useful for the diagnosis of H. pylori infection in children, even in the younger ones.
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Affiliation(s)
- G A Rocha
- Laboratory of Research in Bacteriology, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
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Kimmel B, Bosserhoff A, Frank R, Gross R, Goebel W, Beier D. Identification of immunodominant antigens from Helicobacter pylori and evaluation of their reactivities with sera from patients with different gastroduodenal pathologies. Infect Immun 2000; 68:915-20. [PMID: 10639463 PMCID: PMC97222 DOI: 10.1128/iai.68.2.915-920.2000] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Colonization of the gastric mucosa by Helicobacter pylori is the major cause of gastroduodenal pathologies in humans. Studying the outcome of the humoral immune response directed against this gastric pathogen may contribute substantially to vaccine development and to the improvement of diagnostic techniques based on serology. By using two-dimensional gel electrophoresis, 29 proteins from H. pylori G27 were identified which strongly react with sera derived from H. pylori-infected patients suffering from different gastroduodenal pathologies. These antigens were characterized by mass spectrometry and proved to correspond to products of open reading frames predicted by the H. pylori genome sequence. The comparison of the antigenic patterns recognized by these sera revealed no association of specific H. pylori antigens with antibodies in patients with particular gastroduodenal pathologies.
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Affiliation(s)
- B Kimmel
- Theodor-Boveri-Institut für Biowissenschaften, Lehrstuhl für Mikrobiologie, Universität Würzburg, D-97074 Würzburg, Germany
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Strauss-Ayali D, Simpson KW, Schein AH, McDonough PL, Jacobson RH, Valentine BA, Peacock J. Serological discrimination of dogs infected with gastric Helicobacter spp. and uninfected dogs. J Clin Microbiol 1999; 37:1280-7. [PMID: 10203471 PMCID: PMC84751 DOI: 10.1128/jcm.37.5.1280-1287.1999] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Characterization of the humoral immune responses of people to Helicobacter pylori infection has facilitated the investigation of the host response to bacterial virulence factors and the development of sensitive and specific diagnostic tests. Dogs are commonly infected with gastric Helicobacter spp., but the presence of multiple Helicobacter spp. and possible coinfection in individual dogs have complicated serological evaluation. Evaluation of the antigenic homology of Helicobacter spp. revealed that the major protein bands of Helicobacter felis and Helicobacter bizzozeronii, two Helicobacter spp. that infect dogs, were very similar to UreA (29 to 31 kDa), UreB (63 to 66 kDa), and HSP (58 to 60 kDa) of H. pylori, and sera from infected and uninfected dogs bound in a similar way to each antigen. Immunoblotting and an enzyme-linked immunosorbent assay (ELISA) with H. felis ATCC 49179 antigen were performed with 101 serum samples (from 78 infected dogs and 23 uninfected dogs). Samples from uninfected dogs (median = 8) had fewer bands on immunoblotting than samples from infected dogs (median = 16) (P < 0.05). Combinations of the presence of any two of the low-molecular-mass bands (19, 25, 30, 32, and 37 kDa) or the high-molecular-mass bands (86 and 94 kDa) were found almost solely in samples from infected dogs (P < 0.0001). Kinetic ELISA results were significantly higher for samples from infected dogs (median = 0. 0802 optical density unit [OD]/min) than for samples from uninfected dogs (median = 0.01428 OD/min). The combination of ELISA and immunoblotting results gave a specificity of 95.6% and a sensitivity of 79.8%. No correlation between ELISA results, colonization density, degree of inflammation, and presence of lymphoid follicles was observed. The results indicate substantial antigenic homology between H. felis, H. pylori, and H. bizzozeronii. The combination of ELISA and immunoblotting was a highly specific and moderately sensitive indicator of infection. The degree of seropositivity assessed by ELISA was not related to bacterial colonization density, the degree of gastric inflammation, or the presence of lymphoid follicles.
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Affiliation(s)
- D Strauss-Ayali
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
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