Authentic Biochemistry

An Immunological Distinction between Senescence linked Secretory Phenotypes: SASP vs. Midas. Dr. Dan Guerra. Authentic Biochemistry 16 Jan 2021

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Sinopse

Non-uniform ageing is a major associative risk factor for cancer and degenerative diseases and mitochondrial dysfunction is linked to cellular senescence in association with cell cycle arrest, telomerase decline and nucleic acid/lipid/protein oxidation. Indeed, mitochondrial dysfunction comprises a distinct type of cellular senescence; mitochondrial SIRT3 or SIRT5, can induce Mitochondrial Dysfunction Associated-Senescence (MiDAS) Senescence is a chronological and pathophysiological sequenced event response that restricts mitotic division and thus aberrant proliferation of damaged, infected and/or tumor inducing cells. Because these cells are senescent and exhibit low anabolic currency to present self-produced antigen epitopes as displayed by HLA, they are not targeted by immune responses but rather, may become secretory and induce inflammation by instantiating the Senescence Associated Secretory Phenotype-SASP. Senescence presents with metabolic reprogramming, epigenetic chromatin remodeling, and the secreti