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Culturing and Measuring Fetal and Newborn Murine Long Bones
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Differences in pathways contributing to thyroid hormone effects on postnatal cartilage calcification versus secondary
Gustavo A Gomez1, Patrick Aghajanian2, Sheila Pourteymoor1
1Musculoskeletal Disease Centre, Jerry L. Pettis VA Medical Center, Loma Linda, United States.
Elife
|January 31, 2022
Summary
Thyroid hormone (TH) regulates chondrocyte maturation and mineralization in the proximal femur head. This finding in hypothyroid mice reveals TH
Area of Science:
- Endocrinology
- Developmental Biology
- Orthopedics
Background:
- Proximal and distal femur epiphyses are distinct weight-bearing chondrocyte-derived structures.
- Thyroid hormone (TH) is known to influence distal femur development, but its role in the proximal femur head (FH) is unknown.
Purpose of the Study:
- To investigate the role of thyroid hormone (TH) in the development and mineralization of the proximal femur head (FH).
Main Methods:
- Studies in hypothyroid mice (Tshr deficient).
- X-ray, histology, transcriptional profiling, and immunofluorescence staining.
- In vitro studies using ATDC5 chondrocyte progenitor cells.
Main Results:
- TH controls chondrocyte maturation and mineralization in the proximal FH.
- TH regulates key mineralization genes (Ibsp, Bglap2, Dmp1, Spp1, Alpl) in chondrocytes.
- Identified distinct transcription factor regulation in proximal FH calcification versus distal femur endochondral ossification.
Conclusions:
- TH signaling is crucial for proximal femur head development and mineralization.
- Understanding these pathways may inform treatments for pathological calcification in various tissues.
Keywords:
cartilage calcificationchondrocytesendochondral bone formationfemoral headgeneticsgenomicsmedicinemouseosteoblaststhyroid hormoneMore Related Videos
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