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Aging is at the root of age-related diseases and therapies targeting basic age-associated mechanisms have the potential to extend healthy lifespan. A common feature of older organisms is the accumulation of senescent cells – cells that have irreversibly lost the capacity to undergo replication. Senescent cells are characterized by an irreversible cell cycle arrest and by the Senescence-Associated Secretory Phenotype (SASP), which include many tissue remodeling and pro-inflammatory factors. Senescent cells are intermittently present during embryogenesis and in young organisms. On the contrary senescent cells accumulate and persist in aging tissues. Significantly, these persistent senescent cells can drive low-grade chronic inflammation, and their genetic or pharmacological elimination is sufficient to delay a number of diseases and to improve health span. Here, I will discuss the mechanisms by which senescent cells can promote tissue aging and dysfunction and the potential of targeting senescent cells to delay human aging.

The Rise and the Death of Senescent Cells: From Mechanisms to Interventions