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Infect. Immun., Jun 1996, 2031-2040, Vol 64, No. 6
BJ Appelmelk, I Simoons-Smit, R Negrini, AP Moran, GO Aspinall, JG Forte, T De Vries, H Quan, T Verboom, JJ Maaskant, P Ghiara, EJ Kuipers, E Bloemena, TM Tadema, RR Townsend, K Tyagarajan, JM Crothers Jr, MA Monteiro, A Savio and J De Graaff
Helicobacter pylori is involved in gastritis, gastric and duodenal ulcers,
gastric adenocarcinoma, and mucosa-associated lymphoid tissue lymphoma.
Earlier studies already suggested a role for autoimmune phenomena in H.
pylori-linked disease. We now report that lipopolysaccharides (LPS) of H.
pylori express Lewis y, Lewis x, and H type I blood group structures
similar to those commonly occurring in gastric mucosa. Immunization of mice
and rabbits with H. pylori cells or purified LPS induced an anti-Lewis x or
y or anti-H type I response, yielding antibodies that bound human and
murine gastric glandular tissue, granulocytes, adenocarcinoma, and
mucosa-associated lymphoid tissue lymphoma cells. Experimental oral
infections in mice or natural infection in humans yielded anti-Lewis
antibodies also. The beta chain of gastric (H+,K+)-ATPase, the parietal
cell proton pump involved in acid secretion, contained Lewis y epitopes;
gastric mucin contained Lewis x and y antigenic determinants. Growth in
mice of a hybridoma that secretes H. pylori-induced anti-Lewis y monoclonal
antibodies resulted in histopathological evidence of gastritis, which
indicates a direct pathogenic role for anti-Lewis antibodies. In
conclusion, our observations demonstrate that molecular mimicry between H.
pylori LPS and the host, based on Lewis antigens, and provide understanding
of an autoimmune mechanism for H. pylori-associated type B gastritis.
Copyright © 1996, American Society for Microbiology
Potential role of molecular mimicry between Helicobacter pylori lipopolysaccharide and host Lewis blood group antigens in autoimmunity
Department of Medical Microbiology, Vrije Universiteit Medical School and Academic Hospital, Amsterdam, The Netherlands.
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