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Clinical and Diagnostic Laboratory Immunology, September 2002, p. 1067-1071, Vol. 9, No. 5
1071-412X/02/$04.00+0     DOI: 10.1128/CDLI.9.5.1067-1071.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Immunoglobulin G Antibody Response to Infection with Coccoid Forms of Helicobacter pylori

G. Figueroa,* G. Faúndez, M. Troncoso, P. Navarrete, and M. S. Toledo

Laboratory of Microbiology, Institute of Nutrition and Food Technology, University of Chile, Santiago, Chile

Received 15 March 2002/ Returned for modification 1 May 2002/ Accepted 20 June 2002

An increasing number of studies support a potential role for coccoid forms in Helicobacter pylori infection. Evidence for this was obtained through scanning microscopy, genetic analysis for virulence traits, examination of the presence and activity of key enzymes, and other methods. We studied the serum immunoglobulin G responses to coccoid H. pylori forms by enzyme-linked immunosorbent assay (ELISA) and immunoblotting and compared them with those of bacillary cells. Sera from a total of 295 infected individuals were studied; these included sera from 100 patients with duodenal ulcers, 98 patients with nonulcer dyspepsia, 11 patients with gastroduodenal cancer, and 86 asymptomatic individuals. Initially, we characterized and selected coccoid and bacillary antigenic preparations by one-dimensional (1-D) and 2-D gel electrophoresis and immunoblotting. Data showed that coccoid and bacillary preparations with comparable protein contents have similar patterns in 1-D and 2-D electrophoresis gels and antigenic recognition at blotting. These results revealed that coccoid and spiral antigens in ELISA can equally recognize specific antibodies to H. pylori in sera from infected individuals. The analysis of the spiral and coccoid preparations by Western blotting showed no major differences in antigen recognition. No specific bands or profiles associated with a single gastric condition were identified.

* Corresponding author. Mailing address: Microbiology Laboratory, INTA, University of Chile, Av. Macul 5540, Santiago 11, Chile. Phone: 56 2 678 1474. Fax: 56 2 221 4030. E-mail: gfiguero{at}uchile.cl.

Clinical and Diagnostic Laboratory Immunology, September 2002, p. 1067-1071, Vol. 9, No. 5
1071-412X/02/$04.00+0     DOI: 10.1128/CDLI.9.5.1067-1071.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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Copyright © 2002 by the American Society for Microbiology. All rights reserved.