NAD metabolism in oncogene-induced senescence and mitochondrial dysfunction-associated senescence (Homo sapiens)
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Description
The uppermost part of the pathway includes part of the general NAM salvage pathway in the cytosol as it is relevant to senescence-induced changes to NAD metabolism. In this pathway, NAD levels are maintained through recycling back to NAD from nicotinamide (NAM) and nicotinamide mononucleotide (NMN) (Braidy et al., 2019). The conversion from NAM to NMN is catalyzed by nicotinamide phosphoribosyltransferase (NAMPT), while the conversion from NMN to NAD is catalyzed by nicotinamide mononucleotide adenylyl transferases (NMNATs). Other sources, such as nicotinic acid (NA) and nicotinamid riboside (NR), are not shown here as they are not affected by senescence, at least from current research. OIS-specific interactions are highlighted in orange, while MiDAS-specific interactions are highlighted in purple. General interactions for both (or other senescent types) remain a black color.
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Bibliography
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- Takebayashi S, Tanaka H, Hino S, Nakatsu Y, Igata T, Sakamoto A, Narita M, Nakao M; ''Retinoblastoma protein promotes oxidative phosphorylation through upregulation of glycolytic genes in oncogene-induced senescent cells.''; Aging Cell, 2015 PubMed Europe PMC Scholia
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