MicroRNA-155 suppresses the catabolic effect induced by TNF-α and IL-1β by targeting C/EBPβ in rat nucleus pulposus cells.

Abstract:

AIM:miR-155 is a pro-inflammatory or anti-inflammatory factor depending on the cell type in which it is expressed. miR-155 controls apoptosis and matrix degradation in nucleus pulposus (NP) cells in vitro. The aim of this study is to explore the effect of miR-155 in vivo and further investigate the mechanism of miR-155 in vitro. METHODS:MRI, hematoxylin-eosin staining, or Collagen-II immunochemistry were performed to observe intervertebral disk degeneration in conditional miR-155 overexpression mice and miR-155 knockout mice. In vitro, a dual luciferase reporter assay, real-time PCR and western blot experiments were performed to demonstrate the effect of miR-155 on the expression of catabolic genes induced by inflammatory cytokines and determine the role of β-catenin and C/EBPβ in the miR-155-mediated modulation of the expression of catabolic genes. RESULTS:Degeneration was observed in the lumbar disks of 1-year-old miR-155 knockout mice but not in the conditional miR-155 overexpression mice. miR-155 overexpression repressed the catabolic effect induced by TNF-α or IL-1β in vitro. Furthermore, specifically in NP cells, miR-155 overexpression suppressed the expression of C/EBPβ but not of β-catenin. Additionally, in the loss-of-function experiments using C/EBPβ siRNA, C/EBPβ knockdown repressed the expression of catabolic genes induced by TNF-α and IL-1β, which is consistent with the miR-155 results. CONCLUSION:miR-155 is a sustainable factor for intervertebral disk and suppresses the expression of catabolic genes induced by TNF-α and IL-1β by targeting C/EBPβ in rat NP cells.

journal_name

Connect Tissue Res

authors

Zhou J,Liang A,Hong J,Sun J,Lin X,Peng Y,Wang X,Sun S,Xiao D,Xu K,Ye W

doi

10.1080/03008207.2018.1483356

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

165-177

issue

2

eissn

0300-8207

issn

1607-8438

journal_volume

60

pub_type

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