Abstract
Background: The imbalance between osteogenic and adipogenic differentiation of Bone Marrow-Derived Mesenchymal Stem Cells (BMSCs) is involved in the occurrence and development of Osteoporosis (OP). Previous studies have indicated the potential of phosphatase and actin regulatory factor 1 (Phactr1) in regulating osteogenic and adipogenic differentiation of BMSCs.The present study aims to investigate The Function and Mechanism of Phactr1 in regulating osteogenic and adipogenic Differentiation of BMSCs.Results: Phactr1 increased in both bone and adipose tissue of OP rats. During osteogenic differentiation , Phactr1 decreased and active RhoA, ROCK2 increased, while overexpression Phactr1 inhibits the increase of Runx2. Phactr1 increased and active RhoA decreased, ROCK2 did not changed during adipogenic differentiation, knockdown Phactr1 inhibits the increase of C/EBPα. Phactr1 and ROCK2 were combined in osteogenic differentiation, but not in adipogenic differentiation. By using KD025, the decrease of Phactr1 and the increase of Runx2 were inhibited respectively in osteogenic differentiation. Meanwhile, when ROCK2 was inhibited, Phactr1,C/EBPα were significantly increased in adipogenic differentiation.Conclusions: These findings indicated that Phactr1 negatively regulates bone mass by inhibiting osteogenesis and promoting adipogenesis of BMSCs by activating RhoA/ROCK2.
Restoration of Bone Mass and Strength in Glucocorticoid-Treated Mice by Systemic Transplantation of CXCR4 and Cbfa-1 Co-Expressing Mesenchymal Stem Cells
