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Updated: Aug 3, 2025
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Obtaining Primary Osteocytes Through Murine Calvarial Fractionation of GFP-Expressing Osteocytes
Published on: June 2, 2020
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Distinct differences between calvarial and long bone osteocytes in cell morphologies, gene expression and aging
Minhao Gao1,2, Bin Zhu3, Jing Fan4
1Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia.
The FEBS Journal
|April 12, 2023
Summary
Calvarial and cortical osteocytes exhibit distinct morphologies and gene expression profiles, stemming from different bone formation pathways. Aging impacts cortical osteocytes more significantly than calvarial osteocytes.
Area of Science:
- Bone Biology
- Cellular Morphology
- Transcriptomics
Background:
- Osteocytes are mature bone cells originating from distinct ossification processes.
- Intramembranous and endochondral ossification form different skeletal elements, but their impact on osteocyte characteristics is unclear.
Purpose of the Study:
- To compare the morphological and transcriptomic differences between osteocytes from murine calvaria and femoral cortical bone.
- To investigate the influence of distinct ossification pathways on osteocyte characteristics and aging effects.
Main Methods:
- Confocal structured illumination microscopy for detailed cell imaging.
- Geometric modeling to quantify osteocyte shape and arrangement.
- mRNA sequencing to analyze global gene expression profiles.
Main Results:
- Calvarial osteocytes are round and scattered; femoral osteocytes are spindle-shaped and arrayed.
- Significant differences in transcriptomic profiles and 121 differentially expressed ossification-related genes were identified.
- Aging disrupted dendrite organization and cortical osteocyte structure, but not calvarial osteocytes.
Conclusions:
- Calvarial and cortical osteocytes possess distinct characteristics due to their unique developmental origins.
- Differential gene expression relates to ossification, cytoskeleton, and dendrite development.
- Aging differentially affects calvarial and cortical osteocyte organization.
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