Journal
INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE
Volume 43, Issue 2, Pages 779-790Publisher
SPANDIDOS PUBL LTD
DOI: 10.3892/ijmm.2018.4033
Keywords
osteoarthritis; apoptosis; inflammation; microRNA-93; TLR4; NF-B signaling pathway
Categories
Funding
- Fund of Science and Technology Development Project of Kaifeng City [2017123]
- Scientific Research Project of Administration of Traditional Chinese Medicine of Henan Province [2017ZY3044]
Ask authors/readers for more resources
Osteoarthritis (OA) is a serious disease of the articular cartilage, and inflammation has been implicated in its pathogenesis. Previously, microRNAs (miRNAs) have been proposed as novel regulators of inflammation, however, the functional role of microRNAs in regulating inflammation in OA remains to be fully elucidated. The aim of the present study was to investigate the roles of miRNAs in OA inflammation and the underlying molecular mechanism. Firstly, the miRNA expression patterns were analyzed in the articular cartilage tissues from experimental OA mice using an miRNA microarray. miRNA (miR)-93 was identified with particular interest due to its reported effects on apoptosis and inflammation suppression. Subsequently, the expression of miR-93 was further validated in the articular cartilage tissues of OA mice and lipopolysaccharide (LPS)-stimulated primary chondrocytes. Using this LPS-induced chondrocyte injury model, the overexpression of miR-93 enhanced cell viability, improved cell apoptosis and attenuated the inflammatory response, as reflected by reductions in pro-inflammatory cytokines, including tumor necrosis factor (TNF)-, interleukin (IL)-1 and IL-6. In addition, Toll-like receptor 4 (TLR4), an important regulator of the nuclear factor-B (NF-B) signaling pathway, was identified as a direct target of miR-93 in chondrocytes. Furthermore, the restoration of TLR4 markedly abrogated the inhibitory effects of miR-93 on the chondrocyte apoptosis and inflammation induced by LPS. In addition, the overexpression of miR-93 by agomir-miR-93 significantly inhibited the levels of pro-inflammatory cytokines and cell apoptosis, whereas antagomir-93 exacerbated apoptosis and inflammation in vivo. Taken together, the results of the study suggested that miR-93 may be a promising therapeutic target for the treatment of human OA.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available