한빛사논문
Yong-Soo Lee,1 Tae-Young Kim,1 Yeji Kim,1 Su-Hyun Lee,1 Seungil Kim,1 Sung Wan Kang,1 Jin-Young Yang,1 In-Jeoung Baek,2 Young Hoon Sung,2 Yun-Yong Park,2 Sung Wook Hwang,3 Eunju O,4 Kwang Soon Kim,4 Siqing Liu,5 Nobuhiko Kamada,6 Nan Gao,7 and Mi-Na Kweon1,8,*
1 Mucosal Immunology Laboratory, Department of Convergence Medicine, University of Ulsan College of Medicine/Asan Medical Center,Seoul, Republic of Korea
2 Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
3 Department of Gastroenterology, Asan Medical Center, Seoul, Republic of Korea
4 Academy of Immunology and Microbiology, Institute for Basic Science, Pohang, Republic of Korea
5 National Center for Agricultural Utilization Research, USDA ARS, Peoria, IL, USA
6 Department of Internal Medicine, Division of Gastroenterology, University of Michigan Medical School, Ann Arbor, MI, USA
7 Department of Biological Sciences, Rutgers University, Newark, NJ, USA
8 Lead Contact
*Correspondence : Mi-Na Kweon
Abstract
Symbionts play an indispensable role in gut homeostasis, but underlying mechanisms remain elusive. To clarify the role of lactic-acid-producing bacteria (LAB) on intestinal stem-cell (ISC)-mediated epithelial development, we fed mice with LAB-type symbionts such as Bifidobacterium and Lactobacillus spp. Here we show that administration of LAB-type symbionts significantly increased expansion of ISCs, Paneth cells, and goblet cells. Lactate stimulated ISC proliferation through Wnt/β-catenin signals of Paneth cells and intestinal stromal cells. Moreover, Lactobacillus plantarum strains lacking lactate dehydrogenase activity, which are deficient in lactate production, elicited less ISC proliferation. Pre-treatment with LAB-type symbionts or lactate protected mice in response to gut injury provoked by combined treatments with radiation and a chemotherapy drug. Impaired ISC-mediated epithelial development was found in mice deficient of the lactate G-protein-coupled receptor, Gpr81. Our results demonstrate that LAB-type symbiont-derived lactate plays a pivotal role in promoting ISC-mediated epithelial development in a Gpr81-dependent manner.
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