Cited by 97Skin Protection and AgingCancer-related Molecular PathwaysCell death mechanisms and regulation

p53-regulated apoptosis is differentiation dependent in ultraviolet B-irradiated mouse keratinocytes

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Tron, Victor A., Trotter, Martin J., Tang, Liren, Krajewska, Maryla, Reed, John C., Ho, Vincent C., Li, Gang·1998·The American Journal of Pathology

Abstract

Previous studies from our laboratory, using p53 transgenic mice, have suggested that ultraviolet (UV) light-induced keratinocyte apoptosis in the skin is not affected by overexpression of mutant p53 protein. To further elucidate a possible role for p53 in UV-induced keratinocyte cell death, we now examine apoptosis in skin and isolated keratinocytes from p53 null (-/-) mice and assess the influence of cell differentiation on this process. In vivo, using this knockout model, epidermal keratinocytes in p53-/- mice exhibited only a 5.2-fold increase in apoptosis after 2000 J/m2 UVB irradiation compared with a 26.3-fold increase in normal control animals. If this p53-dependent apoptosis is important in elimination of precancerous, UV-damaged keratinocytes, then it should be active in the undifferentiated cells of the epidermal basal layer. To test this hypothesis, we examined the effect of differentiation on UV-induced apoptosis in primary cultures of murine and human keratinocytes. Apoptosis was p53-independent in undifferentiated murine keratinocytes, which exhibited relative resistance to UVB-induced killing with only a 1.5-fold increase in apoptosis in p53+/+ cells and a 1.4-fold increase in p53-/- cells. Differentiated keratinocytes, in contrast, showed a 9.4-fold UVB induction of apoptosis in p53+/+ cells, almost three times the induction observed in p53-/- cells. This UV-induced difference in apoptosis was observed when keratinocytes were cultured on type IV collagen substrate, but not on plastic alone. Western blotting of UV-irradiated, differentiated keratinocytes did not support a role for either Bax or Bcl-2 in this process. In support of these findings in mice, cell death in human cultured keratinocytes also occurred in a differentiation-associated fashion. We conclude that p53-induced apoptosis eliminates damaged keratinocytes in the differentiated cell compartment, but this mechanism is not active in the basal, undifferentiated cells and is therefore of questionable significance in protection against skin cancer induction.

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Cited by

Sorted by citations

Authors
Tron, V. A., Trotter, M. J., Tang, L., Krajewska, M., Reed, J. C., Ho, V. C., & Li, G.
Affiliations
  • University of British Columbia (CA)
  • Sanford Burnham Prebys Medical Discovery Institute (US)
Corresponding author
Tron, Victor A.
Venue
The American Journal of Pathology
Publisher
Elsevier BV
Published
1998-08
Volume
153
Issue
2
Pages
579-585
ISSN
0002-9440 (ISSN-L)
OpenAlex
W2018042307
Cited by
97
References
3
Citations by year
2024: 1 · 2023: 1 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 2 · 2016: 1 · 2015: 1 · 2014: 6 · 2013: 3
FWCI
11.75
Type
journal article
Language
en
Open access
Locations
  • American Journal Of Pathology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Dermatology › Skin Protection and Aging
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
p53, apoptosis, UVB irradiation, keratinocytes, keratinocyte differentiation, p53 knockout mice, epidermis, skin cancer prevention, Bax, Bcl-2
MeSH terms
Animals, Cell Differentiation, Cells, Cultured, Collagen, Humans, Immunohistochemistry, Proto-Oncogene Proteins, Ultraviolet Rays, Keratinocytes, Genes, p53, Apoptosis, Mice, Knockout, Proto-Oncogene Proteins c-bcl-2, bcl-2-Associated X Protein, Mice

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