Involvement of luminal bacteria, heat shock protein 60, macrophages and γδ T cells in dextran sulfate sodium-induced colitis in rats

Felix W. Leung, Madalene C Y Heng, S. Allen, Kyoji Seno, Joseph Leung, Ming K. Heng

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The in vivo immunological events in dextran sulfate sodium (DSS) -induced colitis were evaluated. Rats were fed water (control) or 5% DSS. Colonic sections were assessed by light microscopy, Gram stain, immunohistochemistry, and electron microscopy. A progressive decline in number and increase in fragmentation of bacteria in the colonic lumen was observed over time. Luminal bacteria were the first to show heat shock protein 60 (HSP60) staining (day 3). Macrophages in close proximity to these bacteria were next to show such staining (day 6), and finally the damaged epithelial cells when colitis became severe (day 15). Ultrastructural assessment showed cell-cell contact interactions between macrophages and dendritic γδ T cells. An increase in the number of γδ T cells and ED1-positive macrophages in the affected colonic tissue over time was documented. These results suggest colonic bacteria, host macrophages, and γδ T cells play specific roles in the immunological reactions in DSS-induced colitis, possibly via an HSP60-mediated mechanism.

Original languageEnglish (US)
Pages (from-to)1472-1479
Number of pages8
JournalDigestive Diseases and Sciences
Volume45
Issue number7
DOIs
StatePublished - 2000

Keywords

  • γδ T cells
  • Bacteria
  • Colitis
  • Heat shock protein 60
  • Macrophages

ASJC Scopus subject areas

  • Gastroenterology

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