Patterns of Early p21 Dynamics Determine Proliferation-Senescence Cell Fate after Chemotherapy
Open accessAbstract
Chemotherapy is designed to induce cell death. However, at non-lethal doses, cancer cells can choose to remain proliferative or become senescent. The slow development of senescence makes studying this decision challenging. Here, by analyzing single-cell p21 dynamics before, during, and days after drug treatment, we link three distinct patterns of early p21 dynamics to final cell fate. Surprisingly, while high p21 expression is classically associated with senescence, we find the opposite at early times during drug treatment: most senescence-fated cells express much lower p21 levels than proliferation-fated cells. We demonstrate that these dynamics lead to a p21 "Goldilocks zone" for proliferation, in which modest increases of p21 expression can lead to an undesirable increase of cancer cell proliferation. Our study identifies a counter-intuitive role for early p21 dynamics in the cell-fate decision and pinpoints a source of proliferative cancer cells that can emerge after exposure to non-lethal doses of chemotherapy.
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Induction of p21 and a Notch-driven SASP are considered early events, whereas upregulation of p16INK4a and an NF-κB-driven SASP are evident at later stages of senescence.
“Induction of p21 and a Notch- driven SASP are considered early events 70,75,76 , whereas upregulation of p16 INK4a and an NF- κB- driven SASP are evident at later stages of senescence 71,77,78 .”
From Senescence and cancer — role and therapeutic opportunities (2022) · cites this paper as [76]
The Results (page unavailable) report p21 induction at an early, 12-hour time point after chemotherapy, supporting the early-p21 part of the clause cited to this paper. They also find that most cells destined for senescence show delayed p21 induction, so the timing is not universal. Our copy does not discuss a Notch-driven SASP; the later-stage p16INK4a and NF-κB clause has a separate citation group. (LLM, conf=0.84)
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- Authors
- Hsu, C.-H., Altschuler, S. J., & Wu, L. F.
- Affiliations
- University of California, San Francisco (US)
- Corresponding author
- Altschuler, Steven J.
- Wu, Lani F.
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2019-07
- Volume
- 178
- Issue
- 2
- Pages
- 361-373.e12
- ISSN
- 0092-8674 (ISSN-L)
- PMC
- PMC6688629
- OpenAlex
- W2950401027
- Cited by
- 181
- References
- 84
- Citations by year
- 2026: 18 · 2025: 29 · 2024: 31 · 2023: 27 · 2022: 22 · 2021: 29 · 2020: 18 · 2019: 6
- FWCI
- 12.86
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Institutes of Health
- Topics
- Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Keywords
- p21, chemotherapy, cellular senescence, tumor cell proliferation, cell fate determination, single-cell dynamics, habitable zone
- MeSH terms
- Checkpoint Kinase 1, DNA Damage, Doxorubicin, Humans, Models, Biological, Tumor Suppressor Protein p53, Cellular Senescence, RNA Interference, RNA, Small Interfering, Cell Line, Tumor, Cell Proliferation, Cyclin-Dependent Kinase Inhibitor p21, Cell Cycle Checkpoints
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