Actin polymerization state regulates osteogenic differentiation in human adipose-derived stem cells

Background Actin is an essential cellular protein that assembles into microfilaments and regulates numerous processes such as cell migration, maintenance of cell shape, and material transport. Methods In this study, we explored the effect of actin polymerization state on the osteogenic differentiation of human adipose-derived stem cells (hASCs). The hASCs were treated for 7 days with different concentrations (0, 1, 5, 10, 20, and 50 nM) of jasplakinolide (JAS), a reagent that directly polymerizes F-actin. The effects of the actin polymerization state on cell proliferation, apoptosis, migration, and the maturity of focal adhesion-related proteins were assessed. In addition, western blotting and alizarin red staining assays were performed to assess osteogenic differentiation. Results Cell proliferation and migration in the JAS (0, 1, 5, 10, and 20 nM) groups were higher than in the control group and the JAS (50 nM) group. The FAK, vinculin, paxillin, and talin protein expression levels were highest in the JAS (20 nM) group, while zyxin expression was highest in the JAS (50 nM) group. Western blotting showed that osteogenic differentiation in the JAS (0, 1, 5, 10, 20, and 50 nM) group was enhanced compared with that in the control group, and was strongest in the JAS (50 nM) group. Conclusions In summary, our data suggest that the actin polymerization state may promote the osteogenic differentiation of hASCs by regulating the protein expression of focal adhesion-associated proteins in a concentration-dependent manner. Our findings provide valuable information for exploring the mechanism of osteogenic differentiation in hASCs.

Actin Polymerization State Regulates Osteogenic Differentiation in Human Adipose-derived Stem Cells

Background:Actin is an essential cellular protein that assembles into microfilaments and regulates numerous processes such as cell migration, maintenance of cell shape, and material transport. In this study, we explored the effect of actin polymerization state on the osteogenic differentiation of human adipose-derived stem cells (hASCs). Methods:The hASCs were treated with different concentrations (0, 1, 5, 10, 20, and 50 nM)of jasplakinolide (JAS), a reagent that directly polymerizes F-actin.The effects ofthe actin polymerization state on cell proliferation, apoptosis, migration, and the maturity of focal adhesion-related proteins were assessed. In addition, western blotting and alizarin red staining assays were performed to assess osteogenic differentiation. Results: These results revealed that cell proliferation and migration in the JAS (0, 1, 5, 10, and 20 nM) groupswashigher than that inthe control group andthe JAS (50 nM) group.The protein expressionof focal adhesion kinase, vinculin, paxillin, and talinwere highest in the JAS (20 nM) group, whilezyxin expression was highestinthe JAS (50 nM) group.Western blottingshowed thatosteogenic differentiation in theJAS (0, 1, 5, 10, 20, and 50 nM) groupswas enhanced compared with that in thecontrol group, and was strongest inthe JAS (50 nM) group.Conclusions: Our data suggest thatthe actinpolymerization state may promote the osteogenic differentiation of hASCs by regulating the protein expression of focal adhesion-associated proteins in a concentration-dependent manner. Our findings provide valuable information for exploring the mechanism of osteogenic differentiationin hASCs.