Expression of the novel tumour suppressor p33(ING1)is independent of p53

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K J Cheung1, J A Bush, W Jia

  • 1Department of Medicine, Division of Dermatology, University of British Columbia, Vancouver, British Columbia, V6H 3Z6, Canada.

British Journal of Cancer
|November 15, 2000
PubMed

Insights

The expression of ING1 (Inhibitor of Growth 1) is independent of p53 status. UVB irradiation induces ING1 in keratinocytes, suggesting a role in skin stress response and carcinogenesis.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Cancer Research

Background:

  • The tumor suppressor candidate p33ING1 interacts with p53 to induce growth arrest and apoptosis.
  • Regulation of ING1 expression under normal and stress conditions remains unclear.
  • The relationship between ING1 expression and p53 status requires further investigation.

Purpose of the Study:

  • To determine if ING1 expression is dependent on p53.
  • To investigate the regulation of ING1 under stress conditions, specifically UVB irradiation.
  • To explore the role of ING1 in cellular stress response and skin carcinogenesis.

Main Methods:

  • Utilized a p53-knockout mouse model to compare ING1 mRNA and protein levels in p53+/+ and p53-/- murine organs.
  • Exposed normal human epithelial keratinocytes (NHEK) and HaCaT keratinocytes (lacking wild-type p53) to UVB irradiation.
  • Assessed ING1 expression levels in keratinocytes and dermal fibroblasts from p53+/+ and p53-/- mice post-UVB exposure.

Main Results:

  • No significant difference in ING1 mRNA and protein levels was observed between p53+/+ and p53-/- murine organs.
  • UVB irradiation elevated ING1 expression in both NHEK and HaCaT keratinocytes.
  • UVB irradiation did not induce ING1 expression in dermal fibroblasts from either p53 genotype.

Conclusions:

  • ING1 expression is independent of p53 status.
  • UVB-induced ING1 expression in keratinocytes suggests a role in cellular stress response.
  • ING1 may be involved in the mechanisms of skin carcinogenesis.

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