Cited by 298Cancer-related Molecular PathwaysImmune cells in cancerCell death mechanisms and regulation

p21 produces a bioactive secretome that places stressed cells under immunosurveillance

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Sturmlechner, Ines, Zhang, Cheng, Sine, Chance C., van Deursen, Erik-Jan, Jeganathan, Karthik B., Hamada, Naomi, Grasic, Jan, Friedman, David +11 more·2021·Science

Abstract

The clock is ticking for senescent cells: Senescent cells promote their own recognition and removal through the immune system by generating a bioactive secretome called the senescence-associated secretory phenotype (SASP). Sturmlechner et al . report that the cell cycle regulator p21 directs an early form of the SASP, which they call the p21-activated secretory phenotype (PASP) (see the Perspective by Reen and Gil). As part of the PASP, the chemokine CXCL14 attracts macrophages, which monitor stressed cells expressing elevated p21. If stressed cells recuperate and p21 levels return to normal within 4 days, then macrophages disengage from their targets. Otherwise, macrophages recruit cytotoxic T cells that facilitate target cell removal. Other cell cycle regulators such as p16 can induce many factors overlapping with the PASP, but p21 uniquely drives this CXCL14-mediated “timer” mechanism of senescent cell immunosurveillance. —STS

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  • Overexpression of p21 or p16 in mouse embryonic fibroblasts led to distinct secretome profiles, showing only partial overlap.

    “This is in line with previous studies in which overexpression of p21 or p16 in mouse embryonic fibroblasts led to distinct secretome profiles (Sturmlechner et al, 2021), showing only partial overlap (Fig. EV9A,B).”

    From Distinct senotypes in p16- and p21-positive cells across human and mouse aging tissues (2025) · cites this paper as Sturmlechner et al, 2021

    In “p21 enforces immunosurveillance through the chemokine CXCL14” (page not specified), the paper compares p21- and p16-overexpressing mouse embryonic fibroblasts and reports differences in their secretomes. But 183 of the 197 p16-associated factors overlap with the p21-associated secretome, which the paper describes as having a high degree of similarity; “only partial overlap” overstates the difference. (LLM, conf=0.86)

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  • In a different mouse model of liver cancer, sustained expression of p21 induced a senescence programme with a peculiar secretory phenotype including CXCL14 and IGFBP3, which contributed to macrophage and lymphocyte recruitment to the tumour site, thus activating immunosurveillance mechanisms.

    “In a different mouse model of liver cancer, sustained expression of p21 was found to induce a senescence programme with a peculiar secretory phenotype including CXCL14 and IGFBP3, which contributed to macrophage and lymphocyte recruitment to the tumour site, thus activating immunosurveillance mechanisms 146 .”

    From Senescence and cancer — role and therapeutic opportunities (2022) · cites this paper as [146]

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  • A recent study has demonstrated that p21 and p16 overexpression elicit distinct secretory phenotypes, with the p21-driven phenotype promoting immunosurveillance.

    “Consistent with the functional diversity of these subpopulations, a recent study has demonstrated that p21 and p16 overexpression elicit distinct secretory phenotypes, with the p21-driven phenotype promoting immunosurveillance (Sturmlechner et al, 2021).”

    From Distinct senotypes in p16- and p21-positive cells across human and mouse aging tissues (2025) · cites this paper as Sturmlechner et al, 2021

  • The tumour suppressor p53-p21 axis cell-autonomously controls the OIS response, but additionally mediates communication between senescent cells and immune cells, presumably via the SASP.

    “The tumour suppressor p53-p21 axis cell- autonomously controls the OIS response, but additionally mediates communication between senescent cells and immune cells, presumably via the SASP 144-146 .”

    From Senescence and cancer — role and therapeutic opportunities (2022) · cites this paper as [146]

  • A p21/Rb pathway produces a p21-activated secretory phenotype (PASP) that directs a CXCL14-mediated mechanism of senescent cell immunosurveillance.

    “A p21/Rb pathway also produces a p21-activated secretory phenotype (PASP) that directs a CXCL14-mediated mechanism of senescent cell immunosurveillance (34).”

    From Connecting aging biology and inflammation in the omics era (2022) · cites this paper as [34]

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Authors
Sturmlechner, I., Zhang, C., Sine, C. C., van Deursen, E.-J., Jeganathan, K. B., Hamada, N., Grasic, J., Friedman, D., Stutchman, J. T., Can, I., Hamada, M., Lim, D. Y., Lee, J.-H., Ordog, T., Laberge, R.-M., Shapiro, V., Baker, D. J., Li, H., & van Deursen, J. M.
Affiliations
  • Mayo Clinic (US)
  • Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, MN, USA.
  • Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA.
  • Epigenomics Program, Center for Individualized Medicine, Mayo Clinic, Rochester, MN, USA.
  • Unity Biotechnology, South San Francisco, CA 94080, USA.
Corresponding author
Li, Hu
Venue
Science
Published
2021-10-29
Volume
374
Issue
6567
Pages
eabb3420-eabb3420
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W3208518221
Cited by
295
References
74
Citations by year
2026: 60 · 2025: 65 · 2024: 59 · 2023: 53 · 2022: 54 · 2021: 4
FWCI
15.72
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion, other-oa)
Funders
  • Mayo Clinic (P30 DK084567)
  • W. M. Keck Foundation
  • Glenn Foundation for Medical Research
  • Fondation pour la Recherche Médicale
  • National Institutes of Health (DK084567)
  • Center for Cell Signaling in Gastroenterology, Mayo Clinic (P30 DK084567, DK084567)
  • National Institute on Aging (RF1AG056318, R01AG057493, R01AG050618)
  • National Cancer Institute (R01CA196631, R01CA208517, R01CA096985, P30CA015083)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK058185, P30DK084567)
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
p21, immune surveillance, secretome, retinoblastoma protein, CXCL14, macrophage polarization, M1 macrophages, cytotoxic T lymphocytes, cell cycle arrest, preneoplastic cells, tumor immunology, cell fate
MeSH terms
Animals, Cell Line, Humans, Immunologic Surveillance, Macrophages, Mice, Transgenic, Genes, ras, Stress, Physiological, T-Lymphocytes, Cytotoxic, Transcription, Genetic, Retinoblastoma Protein, Proto-Oncogene Proteins p21(ras), Cellular Senescence, Chemokines, CXC, Cyclin-Dependent Kinase Inhibitor p16, Hepatocytes, Cyclin-Dependent Kinase Inhibitor p21, Mice, Cell Cycle Checkpoints

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