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MEF2C transcription factor controls chondrocyte hypertrophy and bone development.

Michael A Arnold1, Yuri Kim, Michael P Czubryt

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Developmental Cell
|March 6, 2007
PubMed
Summary

Myocyte enhancer factor 2C (MEF2C) unexpectedly regulates bone development by activating chondrocyte hypertrophy. Its balance with histone deacetylase 4 (HDAC4) is crucial for endochondral bone formation and growth.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Chondrocyte hypertrophy is a critical process for endochondral bone development.
  • The transcription factor MEF2C is known for its roles in muscle and cardiovascular development.

Purpose of the Study:

  • To investigate the role of MEF2C in regulating chondrocyte hypertrophy and endochondral bone development.
  • To elucidate the relationship between MEF2C and histone deacetylase 4 (HDAC4) in bone formation.

Main Methods:

  • Genetic manipulation of Mef2c in mouse models (gene deletion, dominant-negative mutant, superactivating mutant).
  • Analysis of chondrocyte hypertrophy, cartilage angiogenesis, ossification, and longitudinal bone growth.
  • Investigating the interaction between MEF2C and HDAC4 through combined mutations.

Main Results:

  • MEF2C activation of the chondrocyte hypertrophy gene program is essential for bone development.
  • Mice with Mef2c deletion or dominant-negative MEF2C showed impaired bone growth and ossification.
  • A superactivating MEF2C form led to precocious hypertrophy and dwarfism.
  • Endochondral bone formation is sensitive to the MEF2C/HDAC4 balance, with rescue and diminution effects observed in compound mutants.

Conclusions:

  • MEF2C plays a critical, previously unrecognized role in endochondral bone development by controlling chondrocyte hypertrophy.
  • The balance between MEF2C and HDAC4 is a key regulatory mechanism in bone formation.
  • These findings highlight shared regulatory mechanisms involving MEF2 and class II HDACs across muscle, cardiovascular, and bone development.