Article Text
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.
- Helicobacter pylori
- mucosa associated lymphoid tissue lymphoma
- heat shock protein
- autoantibody
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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Abbreviations used in this paper
- MALT
- mucosa associated lymphoid tissue
- Hsp
- heat shock protein
- ELISA
- enzyme linked immunosorbent assay
- PBS
- phosphate buffered saline