Key Points
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Induction of senescence, a stable state of cell cycle arrest, was originally described in normal cells, but it can also be induced in tumour cells in response to various stresses.
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Senescent cells are metabolically active. In contrast to tumour cells, which typically preferentially use glycolysis in the presence of oxygen to generate energy, senescent cells can exhibit hyperactive mitochondrial respiration (oxidative phosphorylation) in some contexts.
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Autophagy is activated during senescence, but its importance varies depending on the context.
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The senescence-associated secretory phenotype (SASP) mediates the diverse functionality of senescent cells in an autocrine and paracrine manner, including reinforcing or inducing senescence, activating an immune response and even promoting tumorigenesis, depending on the context.
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Senescent cells can be eliminated through a SASP-induced immune response, which can involve both innate and adaptive immunity.
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Various triggers, such as tissue damage or tumorigenesis-associated stresses, can cause stromal cell senescence, which may either facilitate or inhibit tumour progression, depending on the context.
Abstract
The core aspect of the senescent phenotype is a stable state of cell cycle arrest. However, this is a disguise that conceals a highly active metabolic cell state with diverse functionality. Both the cell-autonomous and the non-cell-autonomous activities of senescent cells create spatiotemporally dynamic and context-dependent tissue reactions. For example, the senescence-associated secretory phenotype (SASP) provokes not only tumour-suppressive but also tumour-promoting responses. Senescence is now increasingly considered to be an integrated and widespread component that is potentially important for tumour development, tumour suppression and the response to therapy.
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Acknowledgements
The authors thank C. Frezza and D. T. Fearon for their thoughtful discussions, as well as M. Hoare, Masako Narita and other members of Narita group, for critical reading and discussions. This work was supported by the University of Cambridge, Cancer Research UK, Hutchison Whampoa and the Human Frontier Science Program (M.N.).
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Glossary
- Warburg effect
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A shift in glucose metabolism from mitochondrial oxidative phosphorylation to glycolysis in the presence of ample oxygen.
- NADPH
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The reduced form of NADP+ and a source of reducing equivalents. Major sources of NADPH include the pentose phosphate pathway, NADP-dependent malic enzymes and NADP-dependent isocitrate dehydrogenase.
- Pancreatic intraepithelial neoplasias
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(PanINs). Neoplasias that are usually induced by activating mutations in KRAS and represent the most common precursor lesion of pancreatic ductal adenocarcinoma.
- Cytokines
-
A broad class of small proteins that comprise chemokines, interferons, interleukins, lymphokines and tumour necrosis factors that are produced by various cells.
- Inflammasomes
-
Cytosolic multiprotein innate immune complexes that assemble in response to various stimuli and that activate the pro-inflammatory serine protease caspase 1. Inflammasomes initiate innate immune responses by cleaving the inflammatory cytokines pro-interleukin-1 ß (pro-IL-1ß) and pro-IL-18, leading to their activation and secretion.
- Macrophages
-
Generally, M1-polarized macrophages inhibit cell proliferation and cause tissue damage, whereas M2-polarized macrophages promote cell proliferation and tissue repair. The M1 and M2 macrophages promote the T helper 1 (TH1) and TH2 cell responses, respectively.
- Natural killer cells
-
(NK cells). A subgroup of white blood cells that is implicated in the killing of tumour or virus-infected cells. They are generally considered to be the cytotoxic lymphocytes of innate immunity owing to their lack of antigen-specific cell surface receptors, but they can also exert antibody-dependent cell cytotoxicity.
- TH1 cell
-
T helper 1 (TH1) cells are a subset of CD4+ T helper cells that secrete cytokines, including interferon-γ (IFNγ) and tumour necrosis factor (TNF). They are canonically associated with the stimulation of CD8+ cytotoxic T lymphocytes and macrophages, as well as antitumour immunity.
- Enterohepatic circulation
-
The circulation between the liver and the intestine. Bile acids and other substances excreted from the liver are reabsorbed by the enterocytes into the hepatic portal vein.
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Pérez-Mancera, P., Young, A. & Narita, M. Inside and out: the activities of senescence in cancer. Nat Rev Cancer 14, 547–558 (2014). https://doi.org/10.1038/nrc3773
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DOI: https://doi.org/10.1038/nrc3773
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