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Open Access Eradication of Helicobacter spp. by Using Medicated Diet in Mice Deficient in Functional Natural Killer Cells and Complement Factor D

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A commercial 4-drug diet has shown promise in eradicating Helicobacter spp. from rodents; however, its effectiveness in immunocompromised mice is unknown. This study evaluated the efficacy of this treatment in eradicating Helicobacter spp. from mice deficient in functional natural killer cells (Cd1−/−) or complement factor D (Df−/−). Cd1−/− mice naturally infected with H. hepaticus with or without H. rodentium were fed either control or medicated diet for 8 wk followed by 4 wk on control diet. Fecal samples were PCR-evaluated for Helicobacter spp. before mice began treatment and then every 2 wk thereafter for 12 wk. The same experimental design was repeated for eighteen 9- to 21-wk-old Df–/– mice naturally infected with H. bilis with or without H. rodentium. All Df–/– mice and 8- to 21-wk-old Cd1−/− mice ceased shedding Helicobacter spp. after 2 wk of treatment and remained negative throughout the study. In contrast, the Cd1−/− mice that were 24 wk or older shed Helicobacter spp. for the first 8 wk but tested negative at 10 and 12 wk. All treated animals had enlarged ceca and gained less weight than control untreated mice, and 6 of 7 treated Cd1−/− male mice developed mild portal fibrosis. These findings show that within 2 wk of treatment, the 4-drug diet eradicated H. hepaticus and H. rodentium from young Cd1−/− mice and H. bilis and H. rodentium from Df−/− mice, but eradication of established infections in Cd1−/− mice required 8 wk of treatment.

Document Type: Research Article

Affiliations: Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore Maryland

Publication date: May 1, 2010

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  • The Journal of the American Association for Laboratory Animal Science (JAALAS) serves as an official communication vehicle for the American Association for Laboratory Animal Science (AALAS). The journal includes a section of refereed articles and a section of AALAS association news. The mission of the refereed section of the journal is to disseminate high-quality, peer-reviewed information on animal biology, technology, facility operations, management, and compliance as relevant to the AALAS membership. JAALAS accepts research reports (data-based) or scholarly reports (literature-based), with the caveat that all articles, including solicited manuscripts, must include appropriate references and must undergo peer review.

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