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Related Experiment Videos

Cellular mortality to immortalization: mortalin

R Wadhwa1, S C Kaul, Y Mitsui

  • 1National Institute of Bioscience and Human-Technology, Agency of Industrial Science and Technology, Ibaraki, Japan.

Cell Structure and Function
|February 1, 1994
PubMed
Summary
This summary is machine-generated.

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Researchers identified mortalin, a heat shock protein 70 (hsp 70) family member, as key to cellular aging. Its location within cells, cytosolic or perinuclear, determines if cells senesce or proliferate, offering insights into cancer.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Oncology

Background:

  • The fundamental mechanisms underlying cellular mortality (limited division of normal cells) and immortalization (uncontrolled proliferation of cancer cells) are not fully understood.
  • Cell fusion techniques have historically provided valuable insights into cellular aging and immortality.

Purpose of the Study:

  • To review recent findings and describe the use of fused mouse fibroblasts (mortal and immortal) to identify genes involved in senescence.
  • To investigate the role of specific proteins in determining cellular senescence and escape from it.

Main Methods:

  • Utilized cell fusion of mortal and immortal mouse fibroblasts to create natural and conditional aging systems.
  • Employed these systems to identify senescence-determining and/or senescence-escaping genes.

Related Experiment Videos

  • Isolated and characterized a novel protein, mortalin, a member of the heat shock protein 70 (hsp 70) family.

    • Main Results:

    • Identified mortalin (66-kDa) as a novel protein involved in cellular aging.
    • Demonstrated that the intracellular distribution of mortalin distinguishes mortal from immortal phenotypes: cytosolic mortalin is associated with senescence, while perinuclear mortalin is not.
    • Cytosolic mortalin exhibits a senescence-inducing function, whereas perinuclear mortalin has no discernible effect on cellular phenotype.

    Conclusions:

    • Mortalin's intracellular localization is a critical determinant of cellular senescence and immortality.
    • Mortalin holds potential for elucidating mechanisms of cellular mortality and immortality.
    • Mortalin may serve as a biomarker for the early detection of cancerous cells.