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Supplementation with heat-inactivated Lacticaseibacillus paracasei K47 ameliorates allergic asthma in mice by regulating the Th1/Th2 balance

in Beneficial Microbes
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C.-M. Chen Bened Biomedical Co., Ltd., 2F-2, No. 129, Sec. 2, Zhongshan N. Rd., Zhongshan Dist., Taipei City 10491, Taiwan.

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S.-H. Cheng Bened Biomedical Co., Ltd., 2F-2, No. 129, Sec. 2, Zhongshan N. Rd., Zhongshan Dist., Taipei City 10491, Taiwan.

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Y.-H. Chen Institute of Biochemistry and Molecular Biology, National Yang Ming Chiao Tung University, 155, Section 2, Linong Street, Beitou Dist., Taipei City 11221, Taiwan.

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C.-C. Wu Bened Biomedical Co., Ltd., 2F-2, No. 129, Sec. 2, Zhongshan N. Rd., Zhongshan Dist., Taipei City 10491, Taiwan.

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C.-C. Hsu Bened Biomedical Co., Ltd., 2F-2, No. 129, Sec. 2, Zhongshan N. Rd., Zhongshan Dist., Taipei City 10491, Taiwan.

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C.-T. Lin School of Chinese Medicine, China Medical University, 91 Hsueh-Shih Rd, Taichung City 40402, Taiwan.

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Y.-C. Tsai Institute of Biochemistry and Molecular Biology, National Yang Ming Chiao Tung University, 155, Section 2, Linong Street, Beitou Dist., Taipei City 11221, Taiwan.

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Asthma is a chronic inflammatory disease related to the immune response of type 2 T helper cells (Th2), which affects all age groups. The incidence of asthma is increasing worldwide, and it has become a significant public health problem. This study aimed to investigate the immunomodulatory effects of Lacticaseibacillus (formerly Lactobacillus) paracasei K47 on mice with ovalbumin (OVA)-induced allergy. The consequences of orally administered heat-inactivated K47 in OVA-sensitised/challenged BALB/c mice were evaluated by assessing the serum levels of immunoglobulins (Igs), airway hyperresponsiveness (AHR), and bronchoalveolar lavage fluid (BALF) cytokine. In addition, the effect of K47 on type 1 T helper cells (Th1)/Th2 cytokine production in splenocytes from OVA-sensitised mice was evaluated. The results revealed that supplementation with K47 remarkably reduced serum levels of total IgE, OVA-specific IgE, and OVA-specific IgG1 in OVA-sensitised/challenged mice. In addition, K47 intervention ameliorated AHR and suppressed the accumulation of inflammatory cells in the BALF of OVA-sensitised/challenged mice. Furthermore, the immunomodulatory ability of K47 was mediated by regulation of the cytokine profile toward the Th1 response in the BALF, and splenocytes of OVA-sensitised mice. Taken together, these results suggested that K47 can modulate the host immune response to ameliorate AHR and inflammation in allergic asthma.

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