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Related Experiment Videos

ING1 isoforms differentially affect apoptosis in a cell age-dependent manner.

Diego Vieyra1, Tatsuya Toyama, Yasuo Hara

  • 1Cancer Biology Research Group, Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, Alberta, T2N 4N1 Canada.

Cancer Research
|August 3, 2002
PubMed
Summary

The ING1 gene

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Genetics

Background:

  • The human ING1 gene encodes multiple protein isoforms.
  • The biochemical functions and apoptotic roles of ING1 isoforms are largely unknown.
  • ING1 proteins are implicated in cellular processes like apoptosis and tumor suppression.

Purpose of the Study:

  • To investigate the apoptotic effects and biochemical functions of human ING1 isoforms p47(ING1a) and p33(ING1b).
  • To explore the impact of cell age (young vs. senescent) on ING1-mediated apoptosis.
  • To elucidate the relationship between ING1 protein function, chromatin binding, and apoptosis regulation.

Main Methods:

  • Utilized young and senescent human diploid fibroblasts.
  • Induced apoptosis using various treatments (e.g., growth factor deprivation, UV irradiation, hydrogen peroxide).

Related Experiment Videos

  • Examined ING1 isoform expression, chromatin binding, and apoptotic responses, including co-transfection with p53.

    • Main Results:

    • ING1 exhibited isoform-, stimulus-, and cell age-dependent apoptotic properties.
    • p33(ING1b), but not p47(ING1a), induced apoptosis and sensitized young cells to apoptosis-inducing agents.
    • Senescent cells, resistant to apoptosis, showed increased chromatin binding of p33(ING1b).
    • p33(ING1b) and p53 co-expression enhanced apoptosis in tumor cell models.

    Conclusions:

    • ING1's apoptotic functions are linked to chromatin-related activities.
    • These functions are regulated by cell age-dependent mechanisms.
    • p33(ING1b) plays a significant role in apoptosis, particularly in young cells, and its chromatin binding is altered in senescent cells.