Cited by 490Telomeres, Telomerase, and SenescenceProtein Kinase Regulation and GTPase SignalingCancer-related Molecular Pathways

Dose-dependent oncogene-induced senescence in vivo and its evasion during mammary tumorigenesis

Sarkisian, Christopher J., Keister, Blaine A., Stairs, Douglas B., Boxer, Robert B., Moody, Susan E., Chodosh, Lewis A.·2007·Nature Cell Biology

Abstract

Activating Ras mutations can induce either proliferation or senescence depending on the cellular context. To determine whether Ras activation has context-dependent effects in the mammary gland, we generated doxycycline-inducible transgenic mice that permit Ras activation to be titrated. Low levels of Ras activation - similar to those found in non-transformed mouse tissues expressing endogenous oncogenic Kras2 - stimulate cellular proliferation and mammary epithelial hyperplasias. In contrast, high levels of Ras activation - similar to those found in tumours bearing endogenous Kras2 mutations - induce cellular senescence that is Ink4a-Arf- dependent and irreversible following Ras downregulation. Chronic low-level Ras induction results in tumour formation, but only after the spontaneous upregulation of activated Ras and evasion of senescence checkpoints. Thus, high-level, but not low-level, Ras activation activates tumour suppressor pathways and triggers an irreversible senescent growth arrest in vivo. We suggest a three-stage model for Ras-induced tumorigenesis consisting of an initial activating Ras mutation, overexpression of the activated Ras allele and, finally, evasion of p53-Ink4a-Arf-dependent senescence checkpoints.

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Crossref · 10.1038/ncb1567

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Authors
Sarkisian, C. J., Keister, B. A., Stairs, D. B., Boxer, R. B., Moody, S. E., & Chodosh, L. A.
Affiliations
University of Pennsylvania (US)
Corresponding author
Chodosh, Lewis A.
Venue
Nature Cell Biology
Published
2007-04-22
Volume
9
Issue
5
Pages
493-505
ISSN
  • 1465-7392 (ISSN-L)
  • 1476-4679
OpenAlex
W1998767677
Cited by
490
References
9
Citations by year
2026: 5 · 2025: 16 · 2024: 26 · 2023: 24 · 2022: 20 · 2021: 21 · 2020: 22 · 2019: 21 · 2018: 20 · 2017: 18 · 2016: 17 · 2015: 25 · 2014: 36 · 2013: 27 · 2012: 33
FWCI
26.26
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Susan G. Komen for the Cure
  • University of Pennsylvania
  • Susan G. Komen
  • National Cancer Institute (CA-92910, CA105490, CA93719, CA98371, U01CA105490, R01CA093719, R01CA098371)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
Keywords
oncogene-induced senescence, Ras activation, KRAS mutation, mammary carcinogenesis, senescence evasion, Ink4a/Arf, p53, doxycycline-inducible transgenic mice, tumor suppressor pathways, mammary gland
MeSH terms
Animals, Cell Transformation, Neoplastic, Dose-Response Relationship, Drug, Doxycycline, Epithelial Cells, Female, Hyperplasia, Mammary Glands, Animal, Mammary Neoplasms, Experimental, Mice, Transgenic, Mutation, Precancerous Conditions, Promoter Regions, Genetic, Receptors, Estrogen, Receptors, Progesterone, Time Factors, Signal Transduction, Oncogene Protein p21(ras), Up-Regulation, Gene Expression Regulation, Neoplastic, Tumor Suppressor Protein p53, Cellular Senescence, Cell Cycle Proteins, Cyclin-Dependent Kinase Inhibitor p16, ADP-Ribosylation Factors, Protein Transport, Cell Proliferation, Mice

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