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PMID: 9220168 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Detection of serum antibodies to CagA and VacA and of serum neutralizing activity for vacuolating cytotoxin in patients with Helicobacter pylori-induced gastritis.

Clinical and diagnostic laboratory immunology ·Vol. 4 ·No. 4 ·1997-07-00 ·Pages 478-82

Donati M, Moreno S, Storni E, Tucci A, Poli L, Mazzoni C, Varoli O, Sambri V, Farencena A, Cevenini R

Abstract

Thirty patients with dyspepsia, with histological diagnosis of gastritis, and with endoscopic diagnosis of peptic ulcer disease (PUD) (n = 13) or nonulcer dyspepsia (NUD) (n = 17) were admitted to the study. Helicobacter pylori vacuolating cytotoxin-producing strains (Tox+) were isolated from 14 (46.7%) patients, whereas non-cytotoxin-producing (Tox-) H. pylori strains were isolated from the remaining patients. Of 30 patients studied, 20 (66.7%) had serum cytotoxin neutralizing activity in vitro. Fourteen patients with Tox+ H. pylori strains showed serum cytotoxin neutralizing activity and serum immunoglobulin G (IgG) and IgA antibodies reactive with both 87-kDa H. pylori vacuolating cytotoxin (VacA) and 128-kDa cytotoxin-associated gene product (CagA) by immunoblotting using native enriched preparations of VacA and CagA proteins from H. pylori culture supernatants as the antigens. A 94-kDa antigen cross-reacting with the 87-kDa VacA protein could be demonstrated in culture supernatant with immune sera from humans and animals. All patients (n = 10) lacking serum neutralizing activity were also negative for IgG or IgA against VacA antigen, whereas 6 of the 10 patients showed IgG serum antibody responses against CagA antigen. The prevalence of antibodies to VacA and CagA antigens was significantly (P < 0.001) higher in patients with gastritis (20 and 26 patients for VacA and CagA, respectively, of 30 patients) than in H. pylori culture-negative controls (0 of 27 for both VacA and CagA) and in randomly selected blood donors (17 and 21 for VacA and CagA, respectively, of 120 subjects). All patients with PUD had antibodies to CagA, whereas 13 of 17 (76.5%) patients with NUD had anti-CagA antibodies. Serum IgG antibodies to VacA were present in 9 (69.2%) patients with PUD of 13 patients and in 11 (64.7%) patients with NUD of 17 patients. Anti-CagA antibodies seemed to correlate better with PUD than anti-VacA antibodies.

MeSH Terms
Adult Aged Antigens, Bacterial/immunology Bacterial Proteins/immunology Duodenoscopy Female Gastritis/diagnosis,immunology,microbiology Gastroscopy Helicobacter Infections/diagnosis,immunology Helicobacter pylori/immunology Humans Immunoglobulin A/blood Immunoglobulin G/blood Male Middle Aged Neutralization Tests
Chemicals
Antigens, Bacterial Bacterial Proteins Immunoglobulin A Immunoglobulin G VacA protein, Helicobacter pylori cagA protein, Helicobacter pylori
Authors & Affiliations
10 authors, click to expand affiliations / ORCID
Donati M
Sezione di Microbiologia DMCSS, Policlinico S. Orsola, University of Bologna, Italy.
Moreno S
Storni E
Tucci A
Poli L
Mazzoni C
Varoli O
Sambri V
Farencena A
Cevenini R
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Article Info
Journal
Clinical and diagnostic laboratory immunology
Abbr.
Clin Diagn Lab Immunol
ISSN
1071-412X
DOI
10.1128/cdli.4.4.478-482.1997
Published
1997-07-00
Pages
478-82
Language
English
Region
United States
NLM ID
9421292
PMCID
PMC170554
Subset
IM
External Links
PubMed source DOI: 10.1128/cdli.4.4.478-482.1997 PMC Full Text
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