MicroRNA-155 suppresses autophagy in chondrocytes by modulating expression of autophagy proteins.
Osteoarthritis Cartilage
; 24(6): 1082-91, 2016 06.
Article
em En
| MEDLINE
| ID: mdl-26805019
ABSTRACT
OBJECTIVE:
Autophagy dysfunction has been reported in osteoarthritis (OA) cartilage. The objective of this study was to investigate the role of microRNA-155 (miR-155), which is overexpressed in OA, in the regulation of autophagy in human chondrocytes.DESIGN:
Rapamycin (50 nM) and 2-deoxyglucose (2-DG) (5 mM) were used to stimulate autophagy in primary human articular chondrocytes and in the T/C28a2 human chondrocyte cell line. Cells were transfected with LNA GapmeR or mimic specific for miR-155 and autophagy flux was assessed by LC3 western blotting and by Cyto-ID(®) dye quantification in autophagic vacuoles. Expression of predicted miR-155 targets in the autophagy pathway were analyzed by real-time PCR and western blotting.RESULTS:
Autophagy flux induced by rapamycin and 2-DG was significantly increased by miR-155 LNA, and significantly decreased after miR-155 mimic transfection in T/C28a2 cells and in human primary chondrocytes. These effects of miR-155 on autophagy were related to suppression of gene and protein expression of key autophagy regulators including Ulk1, FoxO3, Atg14, Atg5, Atg3, Gabarapl1, and Map1lc3.CONCLUSION:
MiR-155 is an inhibitor of autophagy in chondrocytes and contributes to the autophagy defects in OA.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Autofagia
Limite:
Humans
Idioma:
En
Revista:
Osteoarthritis Cartilage
Assunto da revista:
ORTOPEDIA
/
REUMATOLOGIA
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Itália