Cited by 201Telomeres, Telomerase, and SenescenceCancer-related Molecular PathwaysGenetics, Aging, and Longevity in Model Organisms

Murine fibroblasts lacking p21 undergo senescence and are resistant to transformation by oncogenic Ras.

Pantoja, Cristina, Serrano, Manuel·1999·Oncogene

Abstract

The cell-cycle inhibitor p21 is upregulated during senescence and upon induction of senescence-like arrest by oncogenic Ras. We have used primary fibroblasts derived from p21-null mice to evaluate the role of p21 in these processes. We find that primary p21-/- cells enter senescence and have a lifespan similar to wild-type cells. Upon immortalization, most wild-type and p21-/- cultures acquire alterations in either p53 or p16INK4a, further indicating that p21-deficiency is not sufficient by itself to allow immortalization. Primary p21-/- cells, like wild-type cells, respond to oncogenic Ras by accumulating p53 and p16INK4a, and by decreasing their proliferation rate. In agreement with this, p21-/- cells are refractory to neoplasic transformation by oncogenic Ras when compared to p53-/- cells. We conclude that, in murine fibroblasts, p21 is not essential neither for senescence nor for preventing neoplasic transformation by oncogenic Ras.

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Crossref · 10.1038/sj.onc.1202880

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Authors
Pantoja, C., & Serrano, M.
Affiliations
Consejo Superior de Investigaciones Científicas (ES)
Venue
Oncogene
Published
1999-09-02
Volume
18
Issue
35
Pages
4974-4982
ISSN
  • 0950-9232 (ISSN-L)
  • 1476-5594
OpenAlex
W2081779271
Cited by
201
References
78
Citations by year
2025: 3 · 2023: 6 · 2022: 4 · 2021: 1 · 2020: 4 · 2019: 3 · 2018: 3 · 2017: 4 · 2016: 6 · 2015: 7 · 2014: 7 · 2013: 11 · 2012: 6
FWCI
8.20
Type
journal article
Language
en
Open access
closed
Locations
  • Oncogene (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
p21, cellular senescence, oncogenic Ras, oncogenic transformation, p53, p16INK4a, cell cycle inhibitors, fibroblasts, cell immortalization
MeSH terms
Animals, Cell Cycle, Cell Division, Cell Line, Transformed, Cell Transformation, Neoplastic, Cells, Cultured, Doxorubicin, Fibroblasts, Serial Passage, Transduction, Genetic, Oncogene Protein p21(ras), Gene Expression, Tumor Suppressor Protein p53, Cyclins, 3T3 Cells, Cellular Senescence, Gene Deletion, Mice, Knockout, Cyclin-Dependent Kinase Inhibitor p16, Cyclin-Dependent Kinase Inhibitor p21, Mice

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