Abstract
Purpose
The aim of this study was to investigate the expression of insulin-like growth factor (IGF)-1 and programmed cell death 5 (PDCD5) in osteoarthritis chondrocytes, and to explore the potential correlation between them in the apoptosis process of osteoarthritis chondrocytes.
Methods
Patients with knee osteoarthritis were placed into four categories according to radiological staging. The mRNA and protein levels of IGF-1 and PDCD5 in osteoarthritis chondrocytes were respectively detected by quantitative reverse transcriptase polymerase chain reaction (qPCR) and western blotting. In addition, IGF-1 and PDCD5 protein expression in chondrocytes were also measured by immunohistochemistry. Apoptotic cells were measured by TUNEL staining.
Results
Both the mRNA and protein levels of IGF-1 were down-regulated, while the levels of PDCD5 were up-regulated, and the mRNA and protein levels of IGF-1 were negatively correlated with those of PDCD5, respectively. The apoptotic cell was significantly increased in osteoarthritis chondrocytes compared with control. Importantly, the apoptosis rate was positively correlated with PDCD5 protein expression and negatively correlated with IGF-1 protein expression
Conclusions
We concluded that IGF-1 may down-regulate the expression of PDCD5 and thus inhibit the apoptosis of osteoarthritis chondrocytes.
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Acknowledgements
This study was supported by National Natural Science Foundation of China(30700853).
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Yi, C., Ma, C., Xie, Z. et al. Down-regulation of programmed cell death 5 by insulin-like growth factor 1 in osteoarthritis chondrocytes. International Orthopaedics (SICOT) 37, 937–943 (2013). https://doi.org/10.1007/s00264-012-1744-x
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DOI: https://doi.org/10.1007/s00264-012-1744-x