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Related Experiment Videos

Programmed cell death in the regenerating deer antler.

M Colitti1, S P Allen, J S Price

  • 1Department of Scienze Animali, University of Udine, Italy. Monica.Colitti@uniud.it

Journal of Anatomy
|September 30, 2005
PubMed
Summary

Deer antlers, unique mammalian regenerators, show high programmed cell death (apoptosis) and cell proliferation in their growth zones. This balance is crucial for antler regeneration and skeletal development.

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Area of Science:

  • Mammalian regeneration
  • Skeletal development
  • Tissue remodeling

Background:

  • Antlers are the sole mammalian appendages capable of complete regeneration.
  • Antler growth involves modified endochondral and intramembranous ossification.
  • Understanding antler regeneration mechanisms offers insights into mammalian regenerative potential.

Purpose of the Study:

  • To investigate the roles of apoptosis and cell proliferation in growing deer antlers.
  • To identify specific locations and levels of cell death and proliferation within antler tissues.
  • To examine the expression of apoptosis-related genes (Bcl-2, bax) during antler regeneration.

Main Methods:

  • TUNEL staining to identify apoptosis.
  • PCNA staining to assess cell proliferation.

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  • RT-PCR and immunolocalization to detect Bcl-2 and bax gene expression.

    • Main Results:

    • High apoptosis rates were observed in perichondrium, mesenchymal cells, and cellular periosteum.
    • High proliferation rates were found in mesenchyme, skin (hair follicles), and cellular periosteum.
    • Bcl-2 and bax expression was higher in regenerative zones (perichondrium/mesenchyme, non-mineralized cartilage) compared to skin and mineralized cartilage.

    Conclusions:

    • Programmed cell death is essential for antler regeneration, mirroring its role in skeletal development and bone remodeling.
    • The antler 'growth zone' is characterized by high apoptosis and proliferation in mesenchymal progenitor cells.
    • The significant cell death in the growth zone likely supports the rapid antler morphogenesis and tissue turnover.