title: Lysate of Probiotic Lactobacillus plantarum K8 Modulate the Mucosal Inflammatory System in Dextran Sulfate Sodium-induced Colitic Rats.
abstract: Inflammatory bowel disease (IBD) is caused by dysregulation of colon mucosal immunity and mucosal epithelial barrier function. Recent studies have reported that lipoteichoic acid (LTA) from Lactobacillus plantarum K8 reduces excessive production of pro-inflammatory cytokine. In this study, we investigated the preventive effects of lysate of Lb. plantarum K8 in dextran sulfate sodium (DSS)-induced colitis. Male Sprague-Dawley rats were orally pretreated with lysate of Lb. plantarum K8 (low dose or high dose) or live Lb. plantarum K8 prior to the induction of colitis using 4% DSS. Disease progression was monitored by assessment of disease activity index (DAI). Histological changes of colonic tissues were evaluated by hematoxylin and eosin (HE) staining. Tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6) levels were measured using enzyme-linked immunosorbent assay (ELISA). The colon mRNA expressions of TNF-α, IL-6, and toll like receptor-2 (TLR-2) were examined by quantitative real-time-transcription polymerase chain reaction (qPCR). Lysate of Lb. plantarum K8 suppressed colon shortening, edema, mucosal damage, and the loss of DSS-induced crypts. The groups that received lysate of Lb. plantarum K8 exhibited significantly decreased levels of the pro-inflammatory cytokines TNF-α and IL-6 in the colon. Interestingly, colonic expression of toll like receptor-2 mRNA in the high-dose lysate of Lb. plantarum K8 group increased significantly. Our study demonstrates the protective effects of oral lysate of Lb. plantarum K8 administration on DSS-induced colitis via the modulation of pro-inflammatory mediators of the mucosal immune system.
authors.affiliation: Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 120-750, Korea.
authors.forename: Young-Sook
authors.initials: YS
authors.lastname: Ahn
authors.affiliation: Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 120-750, Korea.
authors.forename: Min Young
authors.initials: MY
authors.lastname: Park
authors.affiliation: Department of Biomedical Laboratory Science, Eulji University, Seongnam 461-713, Korea.
authors.forename: Jae-Ho
authors.initials: JH
authors.lastname: Shin
authors.affiliation: Department of Food Science and Technology, Seoul National University of Science and Technology, Seoul 139-743, Korea.
authors.forename: Ji Yeon
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 120-750, Korea.
authors.forename: Oran
authors.initials: O
authors.lastname: Kwon
keywords: colitis; lysate of Lactobacillus plantarum K8; pro-inflammatory cytokines; toll-like receptor 2