Journal of Gastroenterology

, Volume 31, Issue 2, pp 199–206 | Cite as

Extraintestinal manifestations of granulomatous enterocolitis induced in rabbits by long-term submucosal administration of muramyl dipeptide emulsified with Freund's incomplete adjuvant

  • Kiyoo Kuroe
  • Yoichi Haga
  • Osamu Funakoshi
  • Ichiro Mizuki
  • Kosuke Kanazawa
  • Yutaka Yoshida
Alimentary Tract

Abstract

We examined whether extraintestinal manifestations of granulomatous enterocolitis in rabbits might be produced by the long-term administration of muramyl dipeptide which represents the basic fragment of the bacterial cell wall, emulsified with Freund's incomplete adjuvant. Muramyl dipeptide emulsion was injected submucosally at six sites in the rectum and colon, 10 cm proximal to the anus, each time with a flexible endoscope. Seven rabbits were injected nine times or more every month, and all were sacrificed 1 month after the last injection. The histological changes in the colon in the seven rabbits were mononuclear cell infiltration, epithelioid granulomas, granulomatous lesion, and denuded and regenerative epithelia, although the changes differed in degree. In five of the seven rabbits, histological examination of the liver showed pericholangitis and periductal fibrosis, findings analogous to sclerosing cholangitis in patients with inflammatory bowel disease. In four of the seven rabbits, fibrosis bridging mainly between portal and portal veins, and, in places, between portal and central veins, was seen. Two of the seven rabbits developed polyarthritis. The histological changes in our model suggest that continuous stimulation with bacterial cell wall fragments may be involved in the extraintestinal manifestations of chronic intestinal inflammation such as that seen in inflammatory bowel disease.

Key words

muramyl dipeptide granulomatous enterocolitis in rabbits extraintestinal manifestations pericholangitis arthritis 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Kiyoo Kuroe
    • 1
  • Yoichi Haga
    • 1
  • Osamu Funakoshi
    • 1
  • Ichiro Mizuki
    • 1
  • Kosuke Kanazawa
    • 1
  • Yutaka Yoshida
    • 1
  1. 1.First Department of Internal MedicineHirosaki University School of MedicineHirosaki, AomoriJapan

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