The effect of IGF-1 on cartilage injury in bone marrow mesenchymal stem cells through the BMP2-Smad1/5 signaling pathway.

The objective of this study is to analyze the effect of insulin-like growth factor-1 (IGF-1) in bone marrow mesenchymal stem cells (BMSCs) on cartilage injury and explore the regulatory mechanism of IGF-1 on the bone morphogenetic protein 2 (BMP2)-Smad1/5 signaling pathway. We cultivated rat BMSCs in vitro and observed their cell morphology using an inverted microscope. Flow cytometry was used to identify the surface antigen expression of BMSCs.