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Programmed cell senescence in skeleton during late puberty.

Changjun Li1,2, Yu Chai1,3, Lei Wang1,3

  • 1Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.

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Summary
This summary is machine-generated.

Mesenchymal stem cells (MSPCs) undergo programmed senescence in late puberty, regulated by Ezh2. This process is crucial for normal bone development and preventing osteoporosis later in life.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Epigenetics

Background:

  • Mesenchymal stem/progenitor cells (MSPCs) drive skeletal growth during childhood and puberty.
  • Changes in MSPC properties during late puberty to young adulthood remain poorly understood.
  • Bone growth and accrual decelerate during this transition period.

Purpose of the Study:

  • To investigate the changes in MSPC properties during the transition from late puberty to young adulthood.
  • To elucidate the regulatory mechanisms controlling MSPC fate during skeletal development.
  • To understand the role of Ezh2 in MSPC senescence and bone homeostasis.

Main Methods:

  • Analysis of MSPCs in mouse long bones at late puberty.
  • Investigation of cellular senescence markers, including nestin expression.
  • Genetic manipulation of Ezh2 (enhancer of zeste homolog 2) in MSPCs.
  • Assessment of osteogenesis and bone structure in Ezh2-deficient mice.

Main Results:

  • MSPCs in late pubertal mice undergo programmed senescence, marked by loss of nestin.
  • Ezh2, through H3K27me3, epigenetically controls MSPC senescence by repressing senescence-inducing genes.
  • Deletion of Ezh2 leads to premature senescence, reduced MSPC pool, impaired osteogenesis, and osteoporosis.

Conclusions:

  • A programmed cell fate change occurs in postnatal skeletal MSPCs.
  • Ezh2-mediated epigenetic regulation is critical for controlling MSPC senescence and bone development.
  • Dysregulation of this pathway can lead to skeletal abnormalities and osteoporosis.