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Retesting the commitment theory of cellular aging

C B Harley, S Goldstein

    Science (New York, N.Y.)
    |January 11, 1980
    PubMed
    Summary
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    Human fibroblast aging shows fewer nondividing cells than predicted by commitment theory. Simpler theories align better with data, supporting the limited replicative lifespan of diploid fibroblasts as a model for organismic aging.

    Area of Science:

    • Cell Biology
    • Gerontology
    • Molecular Biology

    Background:

    • The commitment theory of aging posits a specific proportion of nondividing cells in fibroblast cultures.
    • Existing theories do not fully explain the observed variability in cellular lifespan and culture termination.

    Purpose of the Study:

    • To investigate the validity of the commitment theory of human fibroblast aging.
    • To explore alternative explanations for the limited replicative lifespan of diploid fibroblasts.

    Main Methods:

    • Quantitative analysis of nondividing cells in human fibroblast cultures.
    • Comparison of experimental data with predictions from commitment theory and simpler aging models.

    Main Results:

    • Fewer than 10% of cells were nondividing, contradicting the commitment theory's prediction of 55%.

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  • No immortal diploid cells were observed, which is inconsistent with the theory.
  • Data on variable lifespan, population size dependence, and cell type predominance support simpler aging theories.

    • Conclusions:

    • The commitment theory of fibroblast aging is not supported by the current experimental findings.
    • Simpler theories provide a better framework for understanding cellular aging.
    • The limited replicative lifespan of diploid fibroblasts remains a valid model for organismic aging.