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2016 ; 17
(ä): 58
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Pro-inflammatory miR-223 mediates the cross-talk between the IL23 pathway and the
intestinal barrier in inflammatory bowel disease
#MMPMID27029486
Wang H
; Chao K
; Ng SC
; Bai AH
; Yu Q
; Yu J
; Li M
; Cui Y
; Chen M
; Hu JF
; Zhang S
Genome Biol
2016[Mar]; 17
(ä): 58
PMID27029486
show ga
BACKGROUND: The IL23/Th17 pathway is essential for the onset of inflammatory
bowel disease (IBD), yet the specific mechanism by which this pathway initiates
the disease remains unknown. In this study, we identify the mechanisms that
mediate cross-talk between the IL23 pathway and the intestinal barrier in IBD.
RESULTS: The downstream targets of the IL23 pathway were identified by RNA array
profiling and confirmed by immunohistochemical staining. The role of miRNAs that
interact with IL23 was explored in mice with TNBS-induced colitis. Claudin-8
(CLDN8), a multigene family protein that constitutes the backbone of tight
junctions, was identified as a novel target of IL23 in IBD. CLDN8 was
significantly downregulated in IBD patients with inflamed colonic mucosa, and in
trinitrobenzene sulphonic acid (TNBS) induced colitis in mice. Therapeutic
treatment of colitis in mice using an IL23 antibody restored CLDN8 abundance, in
parallel with recovery from colitis. In addition, we identify miR-223 as a novel
mediator of the crosstalk between the IL23 signal pathway and CLDN8 in the
development of IBD. MiR-223 was upregulated in IBD, and its activity was
regulated through the IL23 pathway. Antagomir inhibition of miR-223 reactivated
CLDN8 and improved a number of signs associated with TNBS-induced colitis in
mice. CONCLUSIONS: Our study characterizes a new mechanistic pathway in IBD, in
which miR-223 interacts with the IL23 pathway by targeting CLDN8. Strategies
designed to disrupt this interaction may provide novel therapeutic agents for the
management of IBD.