Osteopontin inhibits HIF-2α mRNA expression in osteoarthritic chondrocytes.

Osteopontin inhibits HIF-2α mRNA expression in osteoarthritic chondrocytes. Exp Ther Med. 2015 Jun;9(6):2415-2419 Authors: Cheng C, Zhang FJ, Tian J, Tu M, Xiong YL, Luo W, Li YS, Song BB, Gao SG, Lei GH Abstract The aim of the present study was to investigate the in vitro effect of osteopontin (OPN) on the expression of hypoxia-inducible factor-2α (HIF-2α) in chondrocytes and the role of OPN in osteoarthritis (OA). Cartilage was purified from the tibial surfaces of patients with OA of the knee and cultured in vitro to obtain chondrocytes. Recombinant human OPN (rhOPN) and OPN small interfering RNA (siRNA) were used to treat the chondrocytes, and the changes in the expression levels of the HIF-2α gene were measured. An anti-CD44 blocking monoclonal antibody (mAb) was used to determine the probable ligand-receptor interactions. Reverse transcription-quantitative polymerase chain reaction assays were designed and validated with SYBR® Green dyes for the simultaneous quantification of the mRNA expression levels of OPN and HIF-2α. The mRNA expression level of HIF-2α was markedly decreased in the rhOPN-treated group compared with that in the control group; by contrast, OPN siRNA increased HIF-2α gene expression. CD44 blocking mAb suppressed the inhibitory effect of OPN on HIF-2α mRNA expression. The results of the present study suggest that OPN may play a protective role in OA by inhibiting HIF-2α gene expression in osteoarthrit...
Source: Experimental and Therapeutic Medicine - Category: Journals (General) Tags: Exp Ther Med Source Type: research