Experimental Study on the Bone Morphogenetic Protein 1-Modified Bone Marrow Mesenchymal Stem Cell Sheets to Promote...

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Skeletal Biology

Background:

• Distraction osteogenesis (DO) is a surgical technique used to regenerate bone defects.
• Enhancing osteogenic efficiency in DO is crucial for reducing treatment duration.
• Genetically modified stem cells offer a promising strategy to improve bone regeneration.

Purpose of the Study:

• To evaluate the efficacy of bone morphogenetic protein 1 (BMP-1) gene-modified bone marrow mesenchymal stem cells (BMSCs) in promoting osteogenesis during mandibular distraction.
• To assess whether BMP-1 modified BMSCs can accelerate bone healing and improve bone quality in DO.
• To investigate the potential of this approach in shortening the clinical treatment period for DO.

Main Methods:

• Constructed tissue-engineered cell sheets of BMSCs modified with BMP-1 or green fluorescent protein (GFP).
• Administered cell sheets into the distraction gap in a rabbit mandibular DO model (Groups A: control, B: GFP-BMSCs, C: BMP-1-BMSCs).
• Evaluated osteogenesis using gross observation, micro-computed tomography (Micro-CT), and histomorphology at 3 and 6 weeks post-distraction.

Main Results:

• BMP-1 modified BMSC sheets (Group C) demonstrated superior osteogenesis compared to GFP-modified sheets (Group B) and the control group (Group A).
• Gross and Micro-CT analyses revealed enhanced bone volume and maturation in Group C.
• Histomorphology confirmed better new bone formation and quality in the BMP-1 group.

Conclusions:

• BMP-1 gene-modified BMSC sheets significantly promote new bone formation in rapid mandibular DO.
• This method effectively compensates for impaired osteogenesis associated with rapid distraction rates.
• The findings suggest a novel therapeutic approach to shorten DO treatment duration in clinical settings.