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American Journal of Pathology, Vol 145, 959-968, Copyright © 1994 by American Society for Investigative Pathology
REGULAR ARTICLES |
JM Ward, MR Anver, DC Haines and RE Benveniste
Veterinary and Tumor-Pathology Section, National Cancer Institute, NCI- Frederick Cancer Research, Maryland 21702-1201.
Helicobacter infections cause chronic gastroenteritis in humans and several animal species. We recently discovered a new Helicobacter (H. hepaticus) that is the etiological agent of a unique chronic active hepatitis in mice. Natural infection appeared to be acquired early in life in enzootically infected colonies. Liver lesions arose as focal necrosis and focal nonsuppurative inflammation by 1 to 4 months of age in susceptible mouse strains. By 6 to 8 months, extensive liver involvement included hepatocytomegaly, bile ductular (oval cell) hyperplasia, and cholangitis. There was an age-related increase in proliferating cell nuclear antigen hepatocyte nuclear labeling index. The bacteria were usually found within bile canaliculi as determined by ultrastructural evaluation of liver lesions, the Steiner modification of the Warthin-Starry stain and immunohistochemistry with a rabbit antibody to Helicobacter pylori. Naturally infected mice showed an age- related increase in serum IgG antibodies to Helicobacter hepaticus proteins. The disease was experimentally reproduced by intraperitoneal injection of liver suspensions from affected livers or bacteria cultivated in vitro. The earliest lesions of the experimental disease appeared 4 weeks after injection. The course of spontaneous and experimental infection was slow and insidious and resulted in high titers of antibodies to bacterial proteins. This chronic bacterial infection represents a new model of chronic liver disease.
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