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Related Experiment Videos

Why are transformed cells immortal? Is the process reversible?

J R Smith1, Y Ning, O M Pereira-Smith

  • 1Huffington Center on Aging, Division of Molecular Virology, Baylor College of Medicine, Houston, TX 77030.

The American Journal of Clinical Nutrition
|June 1, 1992
PubMed
Summary

Normal human cells have limited division potential, unlike immortal cancer cells. Fusing normal and immortal cells showed normal cell division limits are dominant, indicating immortality arises from recessive genetic changes.

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Area of Science:

  • Cell biology
  • Cancer research
  • Genetics

Background:

  • Normal human cells exhibit finite proliferative potential in culture, a process known as senescence.
  • Tumor-derived cells, often immortalized by carcinogens or viruses, bypass this limit and divide indefinitely.
  • Understanding the mechanisms controlling cellular proliferation and senescence is crucial for cancer research.

Purpose of the Study:

  • To investigate the genetic basis of cellular immortality by examining the proliferative behavior of hybrid cells.
  • To determine whether the finite lifespan of normal cells is dominant over the indefinite lifespan of immortal cells.

Main Methods:

  • Fusion of various normal human fibroblast cell lines with immortal human cell lines.
  • Analysis of the proliferative capacity of the resulting hybrid cell lines in culture.

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Main Results:

  • All hybrid cell lines exhibited limited proliferative potential, similar to normal cells.
  • These findings suggest that the finite proliferative capacity of normal cells is a dominant trait.
  • Immortal cells appear to have acquired recessive genetic alterations that enable them to escape senescence.

Conclusions:

  • The senescence of normal human cells is genetically dominant over cellular immortality.
  • Cellular immortality likely arises from recessive genetic changes that overcome growth arrest.
  • This study identified four complementation groups among immortal human cell lines based on their ability to achieve indefinite division.