Lactobacillus plantarum prevents the upregulation of adhesion molecule expression in an experimental colitis model.
BACKGROUND
Lactobacillus consumption has been shown to attenuate the severity of experimental colitis. Whether the effects of Lactobacillus on colitis are related to modulation of leukocyte recruitment into the inflamed intestine is unclear.


OBJECTIVE
To investigate the effect of Lactobacillus plantarum daily intragastric administration on lymphocyte homing and intestinal inflammation in interleukin 10 (IL-10) knockout mice, an experimental model of colitis.


METHODS
Two groups of ten IL-10 knockout mice were fed phosphate buffered saline containing Lactobacillus plantarum 1258 or unmodified vehicle for 4 weeks. Two groups of ten wild-type mice were used as controls. At killing, the bowels were histologically scored and evaluated by transmission electron microscopy. Mucosal addressin cell adhesion molecule 1 (MAdCAM-1) and intercellular adhesion molecule 1 (ICAM-1) expression were determined by immunohistochemistry. The levels of proinflammatory cytokines, tumor necrosis factor alpha (TNF-alpha), and interferon gamma (IFN-gamma) were determined by ELISA. In addition, levels of CD3, alpha4beta7, ICAM-1, and MAdCAM-1 were determined by reverse-transcription polymerase chain reaction and Western blot.


RESULTS
L. plantarum treatment improved the histological damage score in KO mice compared to untreated KO mice. L. plantarum significantly attenuated the expression of MAdCAM-1, ICAM-1, CD3, and alpha4beta7, but did not affect the levels of TNF-alpha and IFN-gamma when treated KO mice were compared to untreated KO mice.


CONCLUSIONS
L. plantarum interfered with the upregulation of adhesion molecules observed in IL-10 knockout mice compared to wild-type mice, attenuating the symptoms of colitis.
Chu
Zhao-Xin
ZX
Department of Surgery, The Sixth People's Hospital Affiliated to Shanghai Jiao Tong University, 600 Yishan Road, 200233, Shanghai, China.
Chen
Hong-Qi
HQ
Ma
Yan-Lei
YL
Zhou
Yu-Kun
YK
Zhang
Ming
M
Zhang
Peng
P
Qin
Huan-Long
HL
D000818:Animals; D015153:Blotting, Western; D017252:CD3 Complex / Q000378:metabolism; D015815:Cell Adhesion Molecules / Q000235:genetics / Q000378:metabolism*; D003092:Colitis / Q000235:genetics / Q000276:immunology / Q000382:microbiology / Q000473:pathology / Q000628:therapy*; D003106:Colon / Q000276:immunology / Q000382:microbiology* / Q000473:pathology; D004195:Disease Models, Animal; D004797:Enzyme-Linked Immunosorbent Assay; D007150:Immunohistochemistry; D018836:Inflammation Mediators / Q000378:metabolism; D016023:Integrins / Q000378:metabolism; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D007371:Interferon-gamma / Q000378:metabolism; D016753:Interleukin-10 / Q000172:deficiency / Q000235:genetics; D048191:Lactiplantibacillus plantarum / Q000254:growth & development*; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D046529:Microscopy, Electron, Transmission; D009088:Mucoproteins; D019936:Probiotics; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012720:Severity of Illness Index; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D015854:Up-Regulation
D017252:CD3 Complex; D015815:Cell Adhesion Molecules; D018836:Inflammation Mediators; D016023:Integrins; C489082:Madcam1 protein, mouse; D009088:Mucoproteins; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; C071777:integrin alpha4beta7; D018799:Intercellular Adhesion Molecule-1; D016753:Interleukin-10; D007371:Interferon-gamma