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Related Concept Videos

The Cell Cycle Control System02:11

The Cell Cycle Control System

The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
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Cell cycle regulation and regeneration.

Ellen Heber-Katz1, Yong Zhang, Khamila Bedelbaeva

  • 1Wistar Institute, Philadelphia, PA 19104, USA. heberkatz@wistar.org

Current Topics in Microbiology and Immunology
|December 25, 2012
PubMed
Summary
This summary is machine-generated.

MRL mouse ear and axolotl limb regeneration share similarities, including nerve-dependent cell cycle entry. Downregulation of p21 in mice confers regenerative capacity, suggesting a conserved mechanism for tissue repair.

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Area of Science:

  • Regenerative biology
  • Comparative physiology
  • Cell cycle regulation

Background:

  • Mammalian regeneration is limited, contrasting with the robust regenerative abilities of amphibians like the axolotl.
  • MRL mice exhibit unique regenerative capacity in ear punch defects, offering a model for studying mammalian regeneration.
  • Urodele limb regeneration involves complex cellular processes including dedifferentiation and blastema formation.

Purpose of the Study:

  • To investigate conserved molecular and cellular mechanisms underlying regeneration in MRL mouse ear punch defects and axolotl limb amputations.
  • To identify parallels in cell cycle regulation and molecular signaling pathways between mammalian and amphibian regeneration models.
  • To explore the role of specific genes and proteins, such as Evi5 and p21, in regenerative processes.

Main Methods:

  • Comparative analysis of cellular behavior in MRL mouse ear fibroblasts and axolotl limb blastema cells.
  • Molecular analysis to identify upregulated genes and expressed proteins in regenerating tissues.
  • Genetic manipulation (p21 knockout) in mice to assess its impact on regenerative capacity.

Main Results:

  • Both MRL mouse ear fibroblasts and axolotl limb blastema cells exhibit G2 cell cycle arrest and nerve-dependent entry into mitosis.
  • Upregulation of Evi5 and expression of sodium channels were observed in both regenerative models.
  • Downregulation of p21 is crucial for MRL mouse ear fibroblast cell cycle entry, and its knockout in wild-type mice restored regenerative capacity.

Conclusions:

  • Nerve-dependent cell cycle regulation, particularly involving p21, is a conserved feature in mammalian and amphibian regeneration.
  • Molecular parallels, including Evi5 and sodium channel expression, suggest shared pathways in tissue repair.
  • Further research is needed to confirm if p21 plays a similar role in urodele limb regeneration cell cycle entry.