Understanding the fundamental mechanisms and conditions of the tumor-suppressive and oncogenic roles of sirtuins in cancer: A review
Silent information regulators (SIRTs) or sirtuins represent a group of class III nicotinamide adenine dinucleotide–dependent histone deacetylases. In mammals, seven types of sirtuins are distinguished, differing in their target structures, enzymatic activities, and subcellular localization. Histone deacetylation is a form of epigenetic regulation of gene expression that can cause activation or deactivation of selected genetic targets. Activation of sirtuins is part of the response to nutritional and environmental stimuli (starvation, DNA damage, and oxidative stress). Activated sirtuins subsequently stimulate specific transcriptional programs to make mitochondrial oxidative metabolism more efficient in the fight against oxidative stress or regulate proteins responsible for DNA repair after damage. As a result of their multifunctional involvement in cellular metabolism, dysregulation and aberrant expression of sirtuins have been observed in various cancers. Sirtuins play a dual role in carcinogenesis, acting as either oncogenes or tumor suppressors and affecting the proliferation, apoptosis, and survival of cancerous cells.
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