Digestive Diseases and Sciences

, Volume 40, Issue 3, pp 495–502 | Cite as

Endotoxin-resistant mice are protected from PAF-induced bowel injury and death role of TNF, complement activation, and endogenous PAF production

  • Xiaoming Sun
  • Michael S. Caplan
  • Yueying Liu
  • Wei Hsueh
Intestinal Disorders, Inflammatory Bowel Disease, Immunology, And Microbiology

Abstract

C3H/HeJ (endotoxin-resistant) mice have been used widely in biological research. However, the mechanism of endotoxin (LPS) resistance is only partially understood. In this study, we first investigated the differences in response to PAF, a mediator of endotoxin shock, between normal and C3H/HeJ mice. We found that in control mice, PAF (2.5 µg/kg) caused shock, hemoconce tration, complement activation, intestinal hypoperfusion, and necrosis with 75% mortality, whereas all C3H/HeJ mice survived, without complement activation or intestinal injury, and manifesting only mild hypotension and hemoconcentration. PAF also caused elevated serum TNF-α in some control mice but not in C3H/HeJ mice. We also observed that PAF induces endogenous PAF production and intestinal phospholipase A2 activation in normal mice, whereas PAF production and phospholipase A2 are suppressed in C3H/HeJ mice. The low endogenous PAF production may account, at least in part, for the resistance to LPS and PAF of C3H/HeJ mice.

Key Words

PAF (platelet-activating factor, paf-acether) intestine endotoxin TNF (tumor necrosis factor) 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • Xiaoming Sun
    • 1
    • 2
  • Michael S. Caplan
    • 1
    • 2
  • Yueying Liu
    • 1
    • 2
  • Wei Hsueh
    • 1
    • 2
  1. 1.From the Department of PathologyChildren's Memorial HospitalUSA
  2. 2.Department of Pediatrics, Evanston HospitalNorthwestern University Medical School

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