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TAp63γ influences mouse cartilage development.

Qian Wang1, Na Li1,2, Fangzhou Chen1

  • 1Department of Hematological Laboratory Science, Jiangsu Key Laboratory of Medical Science and Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang 212013, China.

Aging
|May 12, 2020
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Summary

The p63 protein variant TAp63γ promotes endochondral ossification and skeletal development. This variant accelerates long bone development by influencing chondrocyte differentiation and maturation.

Keywords:
ATDC5TAp63γchondrocyte hypertrophyendochondral ossificationtransgenic studies

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Area of Science:

  • Skeletal Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Tumor protein p63 (p63) is crucial for epithelial and limb development.
  • p63's role in endochondral ossification, particularly the p63 variant TAp63γ, is not fully understood.
  • Chondrocyte hypertrophy is a key stage in endochondral ossification, linked to elevated TAp63γ.

Purpose of the Study:

  • To investigate the function of TAp63γ in chondrocyte differentiation and maturation.
  • To determine the role of TAp63γ in endochondral bone formation *in vivo*.

Main Methods:

  • Developed stable TAp63γ expressing ATDC5 cells to study chondrocyte behavior.
  • Created transgenic mice expressing flag-tagged TAp63γ under the control of *Col10a1* regulatory elements.
  • Analyzed skeletal development and gene expression (Sox9, Runx2) in transgenic mice.

Main Results:

  • TAp63γ expression in ATDC5 cells upregulated Col10a1 and enhanced chondrocyte differentiation markers (alkaline phosphatase, matrix mineralization).
  • Transgenic mice exhibited accelerated ossification in long bones, tail, and digits.
  • Sox9 expression decreased, while Runx2 expression increased in specific chondrocyte zones of transgenic mice.

Conclusions:

  • TAp63γ promotes chondrocyte proliferation, hypertrophic differentiation, and matrix mineralization.
  • TAp63γ plays a significant role in promoting endochondral ossification and skeletal development.
  • TAp63γ influences skeletal development by regulating chondrocyte differentiation and maturation, at least partially via Sox9 and Runx2 pathways.