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AKT status controls susceptibility of malignant keratinocytes to the early-activated and UVB-induced apoptotic

David Decraene1, An Van Laethem, Patrizia Agostinis

  • 1Department of Dermatology, Faculty of Medicine, Katholieke Universiteit Leuven, Belgium. david.decraene@med.kuleuven.ac.be

The Journal of Investigative Dermatology
|June 12, 2004
PubMed

Insights

AKT pathway dysregulation in skin cells impacts ultraviolet B (UVB) response. Aberrant AKT phosphorylation in squamous cell carcinoma (SCC) cells alters UVB-induced apoptosis, suggesting a role in skin cancer development.

Area of Science:

  • Dermatology
  • Molecular Biology
  • Oncology

Background:

  • Human keratinocytes exhibit an ultraviolet B (UVB)-induced apoptotic pathway.
  • This pathway is inhibited by AKT activation.
  • p53-mutated squamous cell carcinoma (SCC) cell lines may respond differently to UVB exposure.

Purpose of the Study:

  • Compare the UVB-induced apoptotic response in primary human keratinocytes versus two SCC cell lines (A431 and A253).
  • Investigate the role of AKT phosphorylation status in mediating UVB-induced apoptosis in these cells.
  • Determine the correlation between AKT phosphorylation and UVB sensitivity in SCC.

Main Methods:

  • Exposing primary human keratinocytes and SCC cell lines (A431, A253) to an apoptotic dose of UVB.
  • Assessing basal AKT phosphorylation status in all cell types.
  • Evaluating the apoptotic response to UVB in relation to AKT phosphorylation.

Main Results:

  • SCC cell lines showed divergent basal AKT phosphorylation and UVB apoptotic responses compared to primary keratinocytes.
  • A253 cells with constitutive dual AKT phosphorylation were resistant to UVB-induced apoptosis.
  • A431 cells with deficient T308 AKT phosphorylation exhibited augmented sensitivity to UVB-induced apoptosis.

Conclusions:

  • A functional AKT pathway is crucial for a normal UVB-induced apoptotic response in skin.
  • Dysregulation of AKT signaling in response to UVB is implicated in keratinocyte oncogenic transformation.
  • Targeting AKT pathways may offer therapeutic strategies for skin cancer prevention or treatment.

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