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SDF-1/CXCR4 axis promotes osteogenic differentiation of BMSCs through the JAK2/STAT3 pathway
Wen Xiong1, Xin Guo1, Xianhua Cai2
1The First School of Clinical Medicine, Southern Medical University, Guangdong, China.
Introduction:
This study aimed to investigate the effects of stromal cell-derived factor-1 (SDF-1) and activation of its receptor, chemokine receptor 4 (CXCR4), on the osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs), and the key signaling mechanisms involved in these effects.
Material And Methods:
BMSCs were treated with 100 μg/L SDF-1 and cultured in osteogenic medium for 7 days. RT-qPCR and western blotting were used to detect the protein and mRNA levels of Janus kinase 2 (JAK2), signal transducer and activator of transcription 3 (STAT3), Runt-related transcription factor 2 (Runx2), and osteocalcin (OCN). Alizarin-red staining was used to detect the mineralization-inducing ability of the cells.
Results:
After BMSCs were treated with SDF-1, the levels of JAK2 mRNA, STAT3 mRNA, and protein phosphorylation increased, the number of mineralized nodules of BMSCs increased, and the osteogenic-differentiation ability was enhanced. In addition, after BMSCs were treated with an inhibitor of JAK2 phosphorylation, the levels of JAK2, STAT3, Runx2, and OCN decreased significantly, the number of mineralized nodules of BMSCs also decreased, and the osteogenic-differentiation ability decreased. The inhibition of CXCR4-treated BMSCs further confirmed that SDF-1/CXCR4 activated JAK2/STAT3 to regulate the osteogenic differentiation of BMSCs.
Conclusions:
SDF-1/CXCR4 promoted the osteogenic differentiation of BMSCs through JAK2/STAT3 activation.
Insights
Stromal cell-derived factor-1 (SDF-1) binding to its receptor CXCR4 enhances bone marrow mesenchymal stem cell (BMSC) osteogenic differentiation. This process is mediated by the JAK2/STAT3 signaling pathway, crucial for bone formation.
Area of Science:
- Stem cell biology
- Molecular signaling
- Bone biology
Background:
- Bone marrow mesenchymal stem cells (BMSCs) are critical for bone regeneration.
- Osteogenic differentiation of BMSCs is a complex process influenced by various signaling molecules.
- Stromal cell-derived factor-1 (SDF-1) and its receptor CXCR4 play roles in cell migration and differentiation.
Purpose of the Study:
- To investigate the effect of SDF-1/CXCR4 signaling on BMSC osteogenic differentiation.
- To elucidate the key signaling pathways involved in SDF-1-induced osteogenesis.
- To understand the molecular mechanisms regulating bone formation by BMSCs.
Main Methods:
- BMSCs were treated with SDF-1 and cultured in osteogenic medium.
- Quantitative real-time PCR (RT-qPCR) and Western blotting were used to assess gene and protein expression.
- Alizarin-red staining evaluated the mineralization capacity of BMSCs.
Main Results:
- SDF-1 treatment increased JAK2 and STAT3 mRNA and protein phosphorylation, enhancing BMSC osteogenic differentiation and mineralization.
- Inhibition of JAK2 phosphorylation significantly reduced osteogenic markers (Runx2, OCN) and mineralization.
- Blocking CXCR4 confirmed the involvement of the SDF-1/CXCR4/JAK2/STAT3 axis in regulating osteogenesis.
Conclusions:
- SDF-1/CXCR4 signaling promotes BMSC osteogenic differentiation.
- The JAK2/STAT3 pathway is a key mediator of SDF-1-induced osteogenesis.
- Targeting the SDF-1/CXCR4 pathway may offer therapeutic strategies for bone regeneration.
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