Probiotic Potential of Enterococcus faecium Isolated from Chicken Cecum with Immunomodulating Activity and Promoting Longevity in Caenorhabditis elegans
2018
Sim, I., Korea University, Seoul, Republic of Korea | Park, K.T., Milae Resources ML Co. Ltd., Seoul, Republic of Korea | Kwon, G., Korea University, Seoul, Republic of Korea | Koh, J.H., Bio-Campus Korea Polytechnic College, Nonsan, Republic of Korea | Lim, Y.H., Korea University, Seoul, Republic of Korea
Probiotics, including Enterococcus faecium, confer a health benefit on the host. An Enterococcus strain was isolated from healthy chicken cecum, identified as E. faecium by 16S rDNA gene sequence analysis, and designated as E. faecium L11. To evaluate the potential of E. faecium L11 as a probiotic, the gastrointestinal tolerance, immunomodulatory activity, and lifespan extension properties of the strain were assayed. E. faecium L11 showed greater than 66% and greater than 62% survival in artificial gastric juice (0.3% pepsin, pH 2.5) and simulated small intestinal juice (0.5% bile salt and 0.1% pancreatin), respectively. Heat-killed E. faecium L11 significantly (p less than 0.05) increased immune cell proliferation compared with controls, and stimulated the production of cytokines (IL-6 and TNF-α) by activated macrophages obtained from ICR mice. In addition, E. faecium L11 showed a protective effect against Salmonella Typhimurium infection in Caenorhabditis elegans. In addition, feeding E. faecium L11 significantly (p less than 0.05) extended the lifespan of C. elegans compared with the control. Furthermore, genes related to aging and host defense were upregulated in E. faecium L11-fed worms. In conclusion, E. faecium L11, which prolongs the lifespan of C. elegans, may be a potent probiotic supplement for livestock.
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