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Updated: Jun 12, 2025
Tricolor Transgenic Murine Model for Studying Growth Plate Injury
Published on: September 6, 2024
Tricolor Transgenic Murine Model for Studying Growth Plate Injury
Hui Sun1, Natasha Patel1, Sharif M Ridwan1
1University of Connecticut Health Center.
Insights
Researchers developed a new mouse model to study growth plate fractures in children. This model uses fluorescent reporters for better visualization and precise injury, aiding the development of new treatments for limb deformities.
Area of Science:
- Orthopedics
- Developmental Biology
- Skeletal Biology
Background:
- Growth plate fractures in children can lead to limb length discrepancies and deformities due to premature fusion.
- Current murine models for studying growth plate injuries are limited in visualization and precision.
- Developing effective treatments for growth plate injuries requires robust and reproducible experimental models.
Purpose of the Study:
- To develop an improved murine model for studying growth plate injuries.
- To enable precise and reproducible injury to the growth plate in mice.
- To facilitate mechanistic studies and therapeutic evaluations for growth plate pathologies.
Main Methods:
- Utilized transgenic mice with tri-lineage fluorescent reporters for collagen types I, II, and X.
- Developed a reproducible bur-based injury method guided by live imaging under fluorescence microscopy.
- Employed frozen histology with native fluorescence to assess cellular responses to injury.
Main Results:
- The transgenic mice exhibit native fluorescence corresponding to key growth plate components.
- The described method allows for reproducible Salter-Harris Type II-like injuries in the murine growth plate.
- Native fluorescence simplifies the assessment of cellular responses post-injury.
Conclusions:
- This novel methodology significantly advances growth plate injury research.
- The improved model provides a detailed and reproducible platform for investigating growth plate pathology.
- This model is crucial for evaluating novel therapeutic strategies for fractured growth plates and preventing limb deformities.
Abstract:
The cartilage growth plates in the bones of children enable limb lengthening but are weak relative to the bone, making them prone to fracturing when bones are overloaded. Better treatments for severely fractured growth plates are needed because the response to injury is a bony bridge that prematurely fuses the growth plate, leading to stunted and/or crooked limbs. Murine models of growth plate injury are advantageous for mechanistic studies, but are challenging because it is difficult to visualize and precisely injure the small growth plates in young mice. We describe here an improved growth plate injury model using transgenic mice with tri-lineage fluorescent reporters for collagen types I, II, and X. These mice show native fluorescence associated with the three primary substrata of the growth plate. A growth plate injury similar to a Salter-Harris Type II injury is created reproducibly with a bur using the hypertrophic section of the growth plate as a reference during live imaging under fluorescence stereo microscopy guidance. Frozen histology analysis of the native fluorescence simplifies assessing the cellular response to injury. This methodology represents a substantial leap in growth plate injury research, providing a detailed and reproducible method for investigating pathology and evaluating new therapeutic strategies.
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