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Laser Capture Microdissection of Mouse Embryonic Cartilage and Bone for Gene Expression Analysis
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Homeoprotein Hex is expressed in mouse developing chondrocytes.

Riyo Morimoto1, Akitsugu Yamamoto, Yoshihiro Akimoto

  • 1Department of Physiological Chemistry II, Faculty of Pharmaceutical Science, Teikyo University, Kanagawa, Japan. r-morimo@pharm.teikyo-u.ac.jp

Journal of Biochemistry
|April 2, 2011
PubMed
Summary

Hematopoietically expressed homeobox gene (HEX) expression and location changes during chondrocyte maturation. This suggests HEX plays a role in endochondral ossification, a key bone formation process.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Endochondral ossification is crucial for bone formation, involving cartilage development and replacement by bone.
  • Chondrocyte proliferation and differentiation are tightly regulated, but underlying molecular mechanisms require further elucidation.

Purpose of the Study:

  • To investigate the role of the hematopoietically expressed homeobox gene (HEX) in chondrogenic differentiation and maturation.
  • To analyze the expression patterns and subcellular localization of HEX protein during chondrocyte development.

Main Methods:

  • Utilized mouse chondrogenic cell line ATDC5 for in vitro studies.
  • Examined HEX gene and protein expression in ATDC5 cells and primary chondrocytes from embryonic mouse tibiae (E15.5).
  • Assessed subcellular localization of HEX protein in chondrocytes at different maturation stages using microscopy.

Main Results:

  • HEX gene expression was detected in the ATDC5 chondrogenic cell line.
  • HEX protein expression significantly increased during chondrogenic differentiation in ATDC5 cells.
  • Chondrogenic differentiation-enhanced HEX protein expression was confirmed in embryonic mouse tibia chondrocytes.
  • Subcellular localization of HEX protein shifted from the cytoplasm near the ER in resting chondrocytes to the nucleus in prehypertrophic chondrocytes, and finally to the ER in hypertrophic chondrocytes.

Conclusions:

  • HEX expression is upregulated during chondrocyte differentiation and maturation.
  • The dynamic subcellular localization of HEX protein correlates with chondrocyte maturation stages.
  • These findings suggest that HEX plays a significant role in regulating endochondral ossification and chondrocyte development.