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KMID : 0545120170270061071
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Journal of Microbiology and Biotechnology
2017 Volume.27 No. 6 p.1071 ~ p.1077
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Enterococcus faecium FC-K Derived from Kimchi Is a Probiotic Strain That Shows Anti-Allergic Activity
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Rho Man-Kwang
Ki Young-Eun
Rho Hyun-In
Kim Tae-Rahk
Kim Yoon-Bum
Sung Won-Kyung
Kim Tae-Woo
Kim Dae-Ok
Kang Hee
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Abstract
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A rise in the occurrence of allergic diseases is attributed to the dysregulated balance of type 1/type 2 immunity, where type 2 T-helper (Th2) cells predominate over type 1 T-helper (Th1) cells, leading to an abnormally increased production of IgE in response to unharmful antigens. Kimchi, a traditional Korean fermented food, is a rich source of beneficial lactic acid bacteria. In this study, we investigated the ability of Enterococcus faecium FC-K derived from kimchi to induce type I immunity in the presence of Th2 polarizing conditions in vitro and in vivo. Stimulation of mouse peritoneal macrophages with E. faecium FC-K induced the production of tumor necrosis factor alpha, interleukin (IL)-6, and IL-12. Under the in vitro Th2 conditions in which splenic T cells were activated in the presence of IL-4, E. faecium FC-K enhanced the ability of T cells to produce interferon (IFN)-γ. Using the ovalbumin (OVA)-induced allergy model, male BALB/c mice receiving E. faecium FC-K reduced the serum level of total IgE, but not that of OVA-specific IgE. Furthermore, the population of activated splenic B cells during OVA immunization was decreased in E. faecium FC-K-treated mice, accounting for a reduction of total IgE in the serum. Restimulating splenocytes from OVA-immunized mice with OVA ex vivo resulted in an increased production of IFN-γ, with no effect on IL-4, in E. faecium FC-Ktreated mice. These observations provide the evidence that E. faecium FC-K can be a beneficial probiotic strain that can modulate the Th2-mediated pathologic response.
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KEYWORD
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Enterococcus faecium, kimchi, T cells, allergy, IgE
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