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The Generation of Closed Femoral Fractures in Mice: A Model to Study Bone Healing
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Hematopoietic Wnts Modulate Endochondral Ossification During Fracture Healing
Kenon Chua1,2,3, Victor K Lee4, Cheri Chan3
1Programme in Cancer and Stem Cell Biology, Duke-NUS Medical School, Singapore, Singapore.
Frontiers in Endocrinology
|June 10, 2021
Summary
Hematopoietic Wnt signaling is not essential for bone development but modulates fracture healing by influencing osteoclast numbers and callus remodeling. This highlights the importance of diverse Wnt sources in bone repair.
Area of Science:
- Bone Biology and Regenerative Medicine
- Skeletal Development and Repair
- Cell Signaling Pathways
Background:
- Wnt signaling is crucial for bone formation, homeostasis, and repair.
- The contribution of Wnt proteins from hematopoietic cells to bone processes remains unclear.
- Understanding diverse Wnt sources is key to optimizing bone repair strategies.
Purpose of the Study:
- To investigate the role of Wnt signaling from hematopoietic cells in musculoskeletal development.
- To determine the impact of hematopoietic Wnt depletion on fracture healing processes.
- To elucidate the specific functions of hematopoietic Wnts in bone regeneration.
Main Methods:
- Genetic knockout of PORCN in hematopoietic cells using Vav-Cre and Porcn mice.
- Assessment of musculoskeletal development and bone quality via micro-CT scans.
- Evaluation of fracture healing using micro-CT, histology, and biomechanical testing.
Main Results:
- Hematopoietic Porcn knockout mice exhibited normal musculoskeletal development and bone quality.
- Fracture healing in knockout mice showed reduced osteoclast numbers and delayed callus remodeling.
- Despite delays, all fractures eventually achieved full maturation, indicating Wnts are modulatory, not essential.
Conclusions:
- Hematopoietic Wnt signaling is not indispensable for normal bone development.
- Hematopoietic Wnts play a significant modulatory role in fracture healing by regulating osteoclast activity.
- Diverse Wnt sources contribute to the complex process of bone repair and remodeling.
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