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Gut 1999;45:20-23 doi:10.1136/gut.45.1.20
  • Helicobacter pylori

Antibodies to human gastric epithelial cells and heat shock protein 60 in Helicobacter pylori positive mucosa associated lymphoid tissue lymphoma

  1. Y Kawaharaa,
  2. K Yokotab,
  3. M Mizunoa,
  4. N Yunokia,
  5. T Uesua,
  6. H Okadaa,
  7. K Kobayashic,
  8. Y Hiraid,
  9. K Ogumab,
  10. T Tsujia
  1. aFirst Department of Internal Medicine, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama, Japan, bDepartment of Bacteriology, cSecond Department of Pathology, dDepartment of Microbiology, Jichi Medical School, 3311-1 Minani-kouchi, Tochigi, Japan
  1. Dr M Mizuno, First Department of Internal Medicine, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama 700-8558, Japan.
  • Accepted 2 February 1999

Abstract

BACKGROUND Development of gastric mucosa associated lymphoid tissue (MALT) lymphoma is thought to be closely associated with host immune reactions toHelicobacter pylori.

AIM To investigate humoral immune responses in patients with MALT lymphoma to antigens shared by H pylori and human gastric epithelial cells.

METHODS Sera were obtained from H pylori positive patients with MALT lymphoma (n = 11) or other gastroduodenal diseases (peptic ulcer, n = 40; non-ulcer dyspepsia, n = 20) and fromH pylori negative healthy control subjects (n = 10). Antibodies to HGC-27 human gastric epithelial cells and human recombinant heat shock protein (Hsp) 60 were examined using an enzyme linked immunosorbent assay (ELISA) and immunoblotting.

RESULTS Antibody titres to HGC-27 cells were significantly elevated inH pylori positive patients with MALT lymphoma when compared with titres in patients with other gastroduodenal diseases and in healthy subjects. Immunoblotting of sera from patients with MALT lymphoma often detected a band with a molecular mass corresponding to Hsp60, and both ELISA and immunoblotting showed elevated antibody titres to the recombinant human Hsp60. Antigenic similarity between Hsp60 and H pylori HspB was documented by immunoblotting experiments.

CONCLUSIONS Autoantibodies reactive with host gastric epithelial cells are often increased in MALT lymphoma, and Hsp60 is a major target antigen. Immune responses induced by immunological cross reactivity between H pylori HspB and human Hsp60 in gastric epithelium may be involved in the development of MALT lymphoma.

Footnotes

  • Abbreviations used in this paper:
    MALT
    mucosa associated lymphoid tissue
    Hsp
    heat shock protein
    ELISA
    enzyme linked immunosorbent assay
    PBS
    phosphate buffered saline

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