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Infect. Immun., 06 1995, 2295-2301, Vol 63, No. 6
SN Lichtman, J Wang, RB Sartor, C Zhang, D Bender, FG Dalldorf and JH Schwab
Arthritis is often associated with intestinal diseases, but the etiology is
not known. We developed a rat model whereby arthritis was reactivated by
experimental small bowel bacterial overgrowth (SBBO). Self-limited
monoarticular arthritis was induced by intra-articular injection of 2
micrograms of rhamnose peptidoglycan-polysaccharide derived from group A
streptococci into the ankle joints in female Lewis rats. Eleven days after
intra-articular injection, when swelling was resolving, experimental SBBO
induced by surgical creation of jejunal self-filling blind loops
reactivated arthritis, but SBBO induced by creation of self-emptying blind
loops, which minimally increases luminal bacteria, and sham operation did
not (P < 0.001). Increased joint diameters in rats with self-filling
blind loops persisted for at least 56 days after surgery. Reactivation of
arthritis due to SBBO was prevented by anti-tumor necrosis factor alpha
antiserum and interleukin 1 receptor antagonist (P < 0.001), indicating
that these cytokines mediate joint swelling secondary to intestinal injury.
Recombinant bactericidal/permeability-increasing protein, an agent which
neutralizes endotoxin, and metronidazole, which is active against anaerobic
bacteria, prevented arthritis (P < 0.001), but polymyxin B (which also
neutralizes endotoxin) and gentamicin had no effect. Mutanolysin, an enzyme
which degrades peptidoglycan-polysaccharide from group A streptococci,
exacerbated arthritis for the first 6 days but then diminished joint
swelling from 12 to 21 days after surgery (P < 0.001). These studies
introduce a reproducible animal model of reactivation of arthritis
secondary to intestinal injury and demonstrate a role for bacterial
products from endogenous enteric organisms.
Copyright © 1995, American Society for Microbiology
Reactivation of arthritis induced by small bowel bacterial overgrowth in rats: role of cytokines, bacteria, and bacterial polymers
Department of Pediatrics, University of North Carolina at Chapel Hill 27599, USA.
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