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Anti-inflammatory effects of Lactobacillus brevis K65 on RAW 264.7 cells and in mice with dextran sulphate sodium-induced ulcerative colitis

in Beneficial Microbes
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Y.-W. Liu Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Sec. 2, Linong Street, 11221 Taipei City, Taiwan, ROC

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W.-K. Ong Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Sec. 2, Linong Street, 11221 Taipei City, Taiwan, ROC

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Y.-W. Su Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Sec. 2, Linong Street, 11221 Taipei City, Taiwan, ROC

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C.-C. Hsu Bened Biomedicals Co., Ltd., 2F.-2, No.129, Sec. 2, Zhongshan N. Rd., Zhongshan Dist., 10448 Taipei City, Taiwan, ROC

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T.-H. Cheng Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Sec. 2, Linong Street, 11221 Taipei City, Taiwan, ROC

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Y.-C. Tsai Institute of Biochemistry and Molecular Biology, National Yang-Ming University, No. 155, Sec. 2, Linong Street, 11221 Taipei City, Taiwan, ROC

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Lactic acid bacteria (LAB) with anti-inflammatory effects may be beneficial to the prevention or treatment for inflammation-related diseases, such as inflammatory bowel diseases. In an in vitro assay, heat-killed Lactobacillus brevis K65 (K65) reduced lipopolysaccharide-induced production of nitric oxide, tumour necrosis factor (TNF)-α and prostaglandin E2 in RAW 264.7 cells. In RAW 264.7 cells stably expressing an ind=ucible nitric oxide synthase (iNOS) reporter, viable K65 showed greater inhibition of iNOS production than its heat-killed form. In order to further examine the in vivo anti-inflammatory effect of K65, viable K65 was orally administered to BALB/c mice before and during the period of dextran sulphate sodium (DSS)-induced ulcerative colitis (UC). K65 improved UC symptoms, including reduced the levels of the pro-inflammatory cytokines, TNF-α, interleukin (IL)-6 and IL-1β, and lowered the activity of myeloperoxidase. Furthermore, K65 inhibited TNF-α, cyclo-oxygenase 2, forkhead box P3, and Toll-like receptor 4 mRNA expression in the colonic tissue of DSS-induced UC mice. Taken together, K65, a LAB with in vitro anti-inflammatory activity showed preventive effects on mice with DSS-induced UC by lowering the expression of inflammatory molecules.

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