Oral administration of <italic>Bifidobacterium bifidum</italic> G9-1 suppresses total and antigen specific immunoglobulin E production in mice

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  • Ohno Hiroshi
    Research & Development Department, Biofermin Pharmaceutical Co., Ltd.
  • Tsunemine Satoru
    Research & Development Department, Biofermin Pharmaceutical Co., Ltd.
  • Isa Yasuhiro
    Research & Development Department, Biofermin Pharmaceutical Co., Ltd.
  • Shimakawa Masaki
    Research & Development Department, Biofermin Pharmaceutical Co., Ltd.
  • Yamamura Hideki
    Research & Development Department, Biofermin Pharmaceutical Co., Ltd.

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  • Oral Administration of Bifidobacterium bifidum G9-1 Suppresses Total and Antigen Specific Immunoglobulin E Production in Mice

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Recent studies have suggested that oral bacteriotherapy with probiotics might be useful in the management of allergic diseases. We investigated the effect of oral administration of Bifidobacterium bifidum G9-1 (BBG9-1) on immunoglobulin (Ig) E production in BALB/c mice. Live BBG9-1 was orally administered to mice for 2 weeks from 1 week before ovalbumin (OVA)-immunization. The treatment of BBG9-1 significantly reduced serum total IgE level. In addition, BBG9-1 significantly and largely reduced the serum level of OVA-specific IgE without lowering of the specific IgG1 and increasing of the specific IgG2a. We also examined T helper type (Th) 1 and Th2 cytokine production from OVA-immunized splenocytes by restimulation with OVA in vitro. Productions of interferon (IFN)-γ, interleukin (IL)-4 and IL-5 from the splenocytes of mice given BBG9-1 were weaker than those of control mice. We conclude that oral administration of BBG9-1 selectively and powerfully suppresses total and antigen specific IgE production in mice. It is suggested that BBG9-1 is useful for the prophylactic treatment in IgE-dependent allergic diseases.

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