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Evaluation of the potential anti-allergic effects of heat-inactivated Lactobacillus paracasei V0151 in vitro, ex vivo, and in vivo

in Beneficial Microbes
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Y.W. Liu Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Li-Nong St., Sec. 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.

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T.Y. Fu Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Li-Nong St., Sec. 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.
Probiotics Research Center, National Yang-Ming University, No. 155, Li-Nong St., Section 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.

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W.S. Peng Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Li-Nong St., Sec. 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.
Probiotics Research Center, National Yang-Ming University, No. 155, Li-Nong St., Section 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.

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Y.H. Chen Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Li-Nong St., Sec. 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.
Probiotics Research Center, National Yang-Ming University, No. 155, Li-Nong St., Section 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.

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Y.M. Cao Want Want China Holdings Ltd., No.1088, East Hond Song Rd., Shanghai 201103, China P.R.

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C.C. Chen Want Want China Holdings Ltd., No.1088, East Hond Song Rd., Shanghai 201103, China P.R.

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W.L. Hung Want Want China Holdings Ltd., No.1088, East Hond Song Rd., Shanghai 201103, China P.R.

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Y.C. Tsai Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Li-Nong St., Sec. 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.
Probiotics Research Center, National Yang-Ming University, No. 155, Li-Nong St., Section 2, BeiTou Dist., Taipei 11221, Taiwan, R.O.C.

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The efficacy of Lactobacillus paracasei V0151 (V0151), isolated from the faeces of a child, to modulate immune responses was investigated. In RAW 264.7 cells expressing an inducible nitric oxide synthase (iNOS)-directed luciferase gene, heat-inactivated V0151 stimulated iNOS expression followed by nitric oxide production. V0151 significantly elevated interferon gamma, interleukin (IL)-10, tumour necrosis factor alpha, and IL-1β production in human peripheral blood mononuclear cells. In splenocytes isolated from ovalbumin (OVA)-sensitised BALB/c mice treated with OVA and V0151 at different bacterium-to-cell ratios (1:1, 10:1, and 20:1) for 96 h, IL-2, IL-4, IL-5, and IL-13 production was dose-dependently downregulated, whereas IL-12 was dose-dependently upregulated. Collectively, our findings indicate that V0151 might regulate pro-inflammatory factors in macrophages and splenocytes. Furthermore, the T helper 1/T helper 2 (Th1/Th2) balance was also skewed toward Th1 dominance through the elevation of Th1 cytokine production.

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