Analysis of Gene Expression in Ceca of Helicobacter hepaticus-Infected A/JCr Mice before and after Development of Typhlitis

AUTOR(ES)

Myles, Matthew H.

FONTE

American Society for Microbiology

RESUMO

The inflammatory bowel diseases, Crohn's disease and ulcerative colitis, are chronic inflammatory disorders of the gastrointestinal tract. The causes of these diseases remain unknown; however, prevailing theories suggest that chronic intestinal inflammation results from a dysregulated immune response to ubiquitous bacterial antigens. While a substantial body of data has been amassed describing the role of the adaptive immune system in perpetuating and sustaining inflammation, very little is known about the early signals, prior to the development of inflammation, that initiate and direct the abnormal immune response. To this end, we characterized the gene expression profile of A/JCr mice with Helicobacter hepaticus-induced typhlitis at month 1 of infection, prior to the onset of histologic disease, and month 3 of infection, after chronic inflammation is fully established. Analysis of the gene expression in ceca of H. hepaticus infected mice revealed 25 up-regulated and 3 down-regulated genes in the month-1 postinoculation group and 31 up-regulated and 2 down-regulated genes in the month-3 postinoculation group. Among these was a subset of immune-related genes, including interferon-inducible protein 10, monokine induced by gamma interferon, macrophage-induced protein 1 alpha, and serum amyloid A1. Semiquantitative real-time reverse transcriptase PCR confirmed the increased expression levels of these genes, as well as elevated expression of gamma interferon. To our knowledge, this is the first report profiling cecal gene expression in H. hepaticus-infected A/JCr mice. The findings of altered gene expression prior to the development of any features of pathology and the ensuing chronic disease course make this an attractive model for studying early host response to microbe-induced inflammatory bowel disease.

Documentos Relacionados

• Chronic proliferative hepatitis in A/JCr mice associated with persistent Helicobacter hepaticus infection: a model of helicobacter-induced carcinogenesis.
• Chronic Active Hepatitis Induced by Helicobacter hepaticus in the A/JCr Mouse Is Associated with a Th1 Cell-Mediated Immune Response
• SCID/NCr Mice Naturally Infected with Helicobacter hepaticus Develop Progressive Hepatitis, Proliferative Typhlitis, and Colitis
• Persistent hepatitis and enterocolitis in germfree mice infected with Helicobacter hepaticus.
• Cloning, Expression, and Catalytic Activity of Helicobacter hepaticus Urease