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Published on: March 29, 2018
[Effects of impaction on tissue engineered bone modified by BMP-2 gene]
Mengning Yan1, Tingting Tang, Kerong Dai
1Department of Orthopaedics, 9th People's Hospital, Medical College of Shanghai Jiaotong University, Shanghai 200011, P. R. China. yanmengning@yahoo.com.cn
Summary
Direct impaction negatively affects cell survival and bone formation in adenovirus-mediated human bone morphogenetic protein 2 (Adv-hBMP2) modified tissue-engineered bone. However, impacted grafting remains feasible, with surviving cells retaining function.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Context:
- Tissue-engineered bone constructs are crucial for bone defect repair.
- Adenovirus-mediated human bone morphogenetic protein 2 (Adv-hBMP2) gene modification enhances bone formation.
- The mechanical integrity of engineered bone under impact loading is a critical consideration for clinical application.
Purpose:
- To evaluate the impact of direct mechanical impaction on cell survival and bone formation in Adv-hBMP2-modified tissue-engineered bone.
- To assess the feasibility of using this engineered bone in impacted grafting procedures.
Summary:
- Marrow stromal cells (MSCs) were genetically modified with Adv-hBMP2 and seeded onto freeze-dried cancellous bone (FDB) to create tissue-engineered bone.
- In vitro impaction significantly reduced cell viability and increased debris, with cell numbers decreasing and collagen increasing over time.
- Histological analysis revealed diminished bone formation, primarily localized to the periphery after impaction, compared to pre-impaction controls.
Impact:
- Mechanical impaction compromises the cellular and osteogenic potential of Adv-hBMP2-modified tissue-engineered bone.
- Despite reduced cell survival, the remaining cells maintain functionality, suggesting potential for continued bone regeneration.
- The study supports the feasibility of using Adv-hBMP2-modified tissue-engineered bone in impaction grafting, with implications for orthopedic and reconstructive surgery.
