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Open AccessJournal ArticleDOI

Directed elimination of senescent cells by inhibition of BCL-W and BCL-XL.

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TLDR
The finding that senescent cells can be eliminated pharmacologically paves the way to new strategies for the treatment of age-related pathologies.
Abstract
Senescent cells, formed in response to physiological and oncogenic stresses, facilitate protection from tumourigenesis and aid in tissue repair. However, accumulation of such cells in tissues contributes to age-related pathologies. Resistance of senescent cells to apoptotic stimuli may contribute to their accumulation, yet the molecular mechanisms allowing their prolonged viability are poorly characterized. Here we show that senescent cells upregulate the anti-apoptotic proteins BCL-W and BCL-XL. Joint inhibition of BCL-W and BCL-XL by siRNAs or the small-molecule ABT-737 specifically induces apoptosis in senescent cells. Notably, treatment of mice with ABT-737 efficiently eliminates senescent cells induced by DNA damage in the lungs as well as senescent cells formed in the epidermis by activation of p53 through transgenic p14(ARF). Elimination of senescent cells from the epidermis leads to an increase in hair-follicle stem cell proliferation. The finding that senescent cells can be eliminated pharmacologically paves the way to new strategies for the treatment of age-related pathologies.

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Journal ArticleDOI

Molecular mechanisms of cell death: recommendations of the Nomenclature Committee on Cell Death 2018.

Lorenzo Galluzzi, +186 more
TL;DR: The Nomenclature Committee on Cell Death (NCCD) has formulated guidelines for the definition and interpretation of cell death from morphological, biochemical, and functional perspectives.
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Hallmarks of Cellular Senescence.

TL;DR: The molecular regulators of senescence phenotypes and how they are used for identifying senescent cells in vitro and in vivo are described and the importance that these levels of regulations have in the development of therapeutic targets is highlighted.
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Senescence in Health and Disease

TL;DR: This model suggests that the abundance of senescent cells in vivo predicts "molecular," as opposed to chronologic, age and that senescent cell clearance may mitigate aging-associated pathology.
References
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mTOR Signaling in Growth Control and Disease

TL;DR: The mechanistic target of rapamycin (mTOR) signaling pathway senses and integrates a variety of environmental cues to regulate organismal growth and homeostasis as mentioned in this paper, and is implicated in an increasing number of pathological conditions, including cancer, obesity, type 2 diabetes, and neurodegeneration.
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mTOR signaling in growth control and disease.

TL;DR: Recent advances in understanding of the mTOR pathway are reviewed and pharmacological approaches to treat human pathologies linked to mTOR deregulation are discussed.
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Oncogenic ras Provokes Premature Cell Senescence Associated with Accumulation of p53 and p16INK4a

TL;DR: It is shown that expression of oncogenic ras in primary human or rodent cells results in a permanent G1 arrest, and that the onset of cellular senescence does not simply reflect the accumulation of cell divisions, but can be prematurely activated in response to an onCogenic stimulus.
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Mdm2 promotes the rapid degradation of p53

TL;DR: It is proposed that the Mdm2-promoted degradation of p53 provides a new mechanism to ensure effective termination of the p53 signal.
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