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Murine fibroblasts lacking p21 undergo senescence and are resistant to transformation by oncogenic Ras.
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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“Increased expression of p21 also plays a role in induction of senescence, particularly during its initiation.26”
From Total body irradiation causes long-term mouse BM injury via induction of HSC premature senescence in an Ink4a- and Arf-independent manner (2014) · cites this paper as [26]
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Metadata
- 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
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › 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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