MiR-146a regulates the development of ulcerative colitis via mediating the TLR4/MyD88/NF-κB signaling pathway.

Abstract:

OBJECTIVE:To study the effect of micro ribonucleic acid (miR)-146a on the development of ulcerative colitis (UC) and to explore its regulatory effect on the Toll-like receptor 4 (TLR4)/myeloid differentiation factor 88 (MyD88) and nuclear factor-kappa B (NF-κB) signaling pathways. MATERIALS AND METHODS:The UC model in rats was established using 2,4,6-trinitrobenzenesulfonic acid (TNBS)/ethanol. A total of 30 male rats were randomly divided into control group, model group and miR-146a inhibitor group, with 10 rats in each group. The disease activity index (DAI) and the macroscopic score of colonic mucosa were measured in each rat. MiR-146a expression in rat intestinal tissues was detected via quantitative Reverse Transcription-Polymerase Chain Reaction (qRT-PCR). Serum levels of interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) in rats were detected via enzyme-linked immunosorbent assay (ELISA). Additionally, Western blotting assay was performed to detect protein levels of TLR4, MyD88, and NF-κB in rat intestinal tissues. RESULTS:Compared with those in control group, rats in model group had notably increased DAI, inflammation score, upregulated expression levels of TLR4, MyD88, NF-κB, and miR-146a, as well as increased serum levels of IL-1β and TNF-α. However, rats in miR-146a inhibitor group exhibited substantially decreased DAI, inflammation score, lowered content of IL-1β and TNF-α and levels of TLR4, MyD88, and NF-κB compared with those in model group. CONCLUSIONS:We found that miR-146a inhibitor alleviates UC by reducing the release of inflammatory factors through suppressing the TLR4/MyD88/NF-κB signaling pathway.

authors

Wang JP,Dong LN,Wang M,Guo J,Zhao YQ

doi

10.26355/eurrev_201903_17260

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

2151-2157

issue

5

eissn

1128-3602

issn

2284-0729

journal_volume

23

pub_type

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