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Infect. Immun., Sep 1996, 3673-3681, Vol 64, No. 9
JG Fox, L Yan, B Shames, J Campbell, JC Murphy and X Li
Helicobacter hepaticus has been associated with naturally occurring
hepatitis in certain inbred strains of mice, and in A/JCr mice it has been
linked to the development of hepatic adenomas and adenocarcinomas. H.
hepaticus was orally inoculated into 30 axenic, outbred female mice, and
the mice were studied longitudinally to fulfill Koch's postulates and to
ascertain the pathogenic potential of the organism under defined germfree
conditions. Ten cage contact mice were also housed in the same germfree
isolator to study transmission patterns, and 10 germfree mice were
maintained in separate isolators as controls. Mice serially euthanized from
3 weeks through 24 months postinoculation (p.i.) were surveyed by culture
and PCR for H. hepaticus in liver and intestinal tissues. Tissues were
analyzed for histopathological changes, and sera were assayed for the
presence of immunoglobulin G antibody to H. hepaticus and changes in the
liver enzyme alanine aminotransferase. Inoculated mice and cage contact
mice were persistently infected with H. hepaticus as identified by culture
and PCR, in both the intestine and, less frequently, the liver, for the
duration of the 2-year study. Animals developed persistent chronic
hepatitis, and in some animals enterocolitis was noted. Hepatocellular
carcinoma was diagnosed in one H. hepaticus-infected mouse. The level of H.
hepaticus serum antibody was highest in experimentally infected mice at 12
to 18 months p.i.; this corresponded in general to the time interval when
the highest levels of alanine aminotransferase were recorded. Although cage
contact mice became persistently infected with H. hepaticus, lesions were
less severe and the levels of serological biomarkers utilized in the study
were lower. The H. hepaticus-infected mouse will provide an ideal model to
study putative bacterial virulence determinants and how they interact with
the host to induce chronic inflammation and tumorigenesis.
Copyright © 1996, American Society for Microbiology
Persistent hepatitis and enterocolitis in germfree mice infected with Helicobacter hepaticus
Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge 02139, USA.
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