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Related Experiment Videos

Cell cycle regulation and apoptosis

K L King1, J A Cidlowski

  • 1Department of Molecular and Cellular Physiology, University of Cincinnati Medical Center, Ohio 45267-0576, USA.

Annual Review of Physiology
|April 29, 1998
PubMed
Summary
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Cell cycle regulators like p53 and pRb are crucial for maintaining tissue homeostasis by balancing cell proliferation and apoptosis. Understanding these links offers insights into coordinated regulation of cell death and growth.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Tissue homeostasis depends on the balance between cell proliferation and programmed cell death (apoptosis).
  • Cell cycle regulators are key mediators linking apoptotic stimuli to both cell proliferation and death.
  • Glucocorticoids are known to induce G1 cell cycle arrest and apoptosis in lymphoid cells.

Purpose of the Study:

  • To investigate the role of cell cycle regulators in apoptosis and tissue homeostasis.
  • To elucidate the mechanisms by which glucocorticoids induce growth arrest and death in lymphoid cells.
  • To explore the interplay between cell cycle machinery and apoptotic pathways.

Main Methods:

  • Analysis of cell cycle components (e.g., c-myc, cyclin D3, p53, pRb, E2F) in response to apoptotic stimuli.

Related Experiment Videos

  • Examination of knockout mouse models lacking specific cell cycle regulators (p53, E2F, pRb).
  • In vitro studies on cultured cells to assess the effects of pRb on apoptosis.

    • Main Results:

    • Decreased expression of c-myc and cyclin D3 is essential for glucocorticoid-induced growth arrest and apoptosis.
    • Loss of p53 or E2F in mice leads to abnormal proliferation and tumor formation, indicating their role in eliminating aberrant cells.
    • pRb functions as an apoptotic suppressor, inducing G1 arrest and preventing cell death; its absence results in non-viability and massive cell death.

    Conclusions:

    • Cell cycle regulators play critical roles in apoptosis and are integral to maintaining tissue homeostasis.
    • The coordinated regulation of cell proliferation and apoptosis involves shared components of cell cycle and apoptotic machinery.
    • Further research into these common components can illuminate the intricate control of these opposing cellular processes.