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A 3-D Visualization Technique for Bone Remodeling in a Suture Expansion Mouse Model
Published on: August 18, 2023
Mechanical force-induced midpalatal suture remodeling in mice
Bo Hou1, Naomi Fukai, Bjorn R Olsen
1Department of Developmental Biology, Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA.
Bone
|April 3, 2007
Summary
Mechanical stress from palatal suture expansion in mice significantly increases periosteal cell proliferation and activates osteoclasts, leading to bone and cartilage formation. This mouse model is valuable for studying skeletal tissue responses to mechanical forces.
Area of Science:
- Skeletal Biology
- Biomechanical Engineering
- Developmental Biology
Background:
- Mechanical stress is a critical epigenetic regulator of skeletal remodeling.
- Bone and cartilage remodeling involve complex interactions between chondrocytes, osteoblasts, and osteoclasts.
- Understanding cellular responses to mechanical stimuli is crucial for regenerative medicine and orthodontics.
Purpose of the Study:
- To investigate cellular and tissue-level responses to mechanical forces in the midpalatal suture using an in vivo mouse model.
- To analyze the effects of palatal suture expansion on cell proliferation, differentiation, and matrix formation.
- To quantify changes in skeletal structure and bone remodeling markers.
Main Methods:
- In vivo mouse midpalatal suture expansion model using opening loops with an initial force of 0.56 N.
- Analysis of cell proliferation (Ki67), alkaline phosphatase, and type I collagen expression.
- Histological assessment (Saffranin O staining) and Micro-computed tomography (Micro-CT) for structural analysis.
- Quantification of osteoclast numbers and bone volume/total volume ratio.
Main Results:
- Palatal suture expansion significantly increased periosteal cell proliferation (Ki67-positive cells) and expression of alkaline phosphatase and type I collagen.
- New cartilage and bone formation were observed, alongside a 60-160% increase in osteoclast numbers, indicating enhanced bone remodeling.
- Micro-CT revealed increased maxillary width and suture width, with a significant reduction in bone volume/total volume ratio, suggesting increased bone marrow space.
Conclusions:
- Expansion forces across the midpalatal suture stimulate bone resorption via osteoclast activation.
- Mechanical stimulation promotes bone and cartilage formation through periosteal cell proliferation and differentiation.
- The mouse midpalatal suture expansion model is a valuable tool for studying the response of mineralized tissues to mechanical stimulation.
