Cellular Senescence in Ageing, Age-Related Disease and Longevity.

Cellular senescence is the state of permanent inhibition of cell proliferation. Senescent cells are characterized by several features including increased activity of senescence-associated β-galactosidase (SA-β-GAL) and senescence-associated secretory phenotype (SASP). In vitro 2 types of senescence have been described. One is telomere-dependent replicative senescence and the second is stress-induced premature senescence (SIPS). Despite some tissue-specific characteristics many kinds of cells, including stem/progenitor cells, can undergo senescence both in vitro and in vivo. Senescent cells were detected in murine, primate and human tissues using different markers. There is mounting evidence that senescent cells contribute to ageing and age-related disease by generating a low grade inflammation state (senescence-associated secretory phenotype-SASP). Even though cellular senescence is a barrier for cancer it can, paradoxically, stimulate development of cancer via proinflammatory cytokines. There is evidence that senescent vascular cells, both endothelial and smooth muscle cells, participate in atherosclerosis and senescent preadipocytes and adipocytes have been shown to lead to insulin resistance. Thus, modulation of cellular senescence is considered as a potential pro-longevity strategy. It can be achieved in several ways like: elimination of selected senescent cells, epigenetic reprogramming of senescent cells, preventing cellular senescence or influencing the secretory phenotype. Some pharmacological interventions have already been shown to have promising activity in this field.
PMID: 24350932