Upregulated MicroRNA-155 Expression in Peripheral Blood Mononuclear Cells and Fibroblast-like Synoviocytes in Rheumatoid Arthritis

Overview

Journal Clin Dev Immunol

Specialty Allergy & Immunology

Date 2013 Oct 24

PMID 24151514

Citations 52

Authors

Li Long

Ping Yu

Yanying Liu

Shiyao Wang

Ru Li

Jinxia Shi

Xiaoping Zhang

Yanmei Li

Xiaolin Sun

Bin Zhou

Liufu Cui

Zhanguo Li

Affiliations

Soon will be listed here.

Abstract

Objective: This study was to screen for the miRNAs differently expressed in peripheral blood mononuclear cells (PBMC) of RA, to further identify the expression of miR-155 in RA PBMC and fibroblast-like synoviocytes (FLS), and to evaluate the function of miR-155 in RA-FLS.

Methods: Microarray was used to screen for differentially expressed miRNAs in RA PBMC. miR-155 expression in PBMC and FLS of RA were identified by real-time PCR. Enforced overexpression and downexpression of miR-155 were used to investigate the function of miR-155 in RA-FLS. Expression of IKBKE which was previously identified as the actual target of miR-155 was examined by Western blot and real-time PCR in RA-FLS.

Results: miR-155 levels were increased in both PBMC and FLS of RA and could be induced by TNF- α . Upregulation of miR-155 decreased MMP-3 levels and suppressed proliferation and invasion of RA-FLS. Inverse relationship between the expressions of miR-155 and the MMPs production-related protein IKBKE was found.

Conclusion: An inflammatory milieu may alter miRNA expression profiles in rheumatoid arthritis. miR-155 is upregulated in RA-FLS, and it may be a protective factor against the inflammatory effect in part by attenuating expression of IKBKE.

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