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Organ fibrosis is the main cause of organ dysfunction, and there is no effective anti-fibrosis clinical therapy yet. SIRT3 is an important mitochondrial deacetylase that plays a role in organ fibrosis by regulating mitochondrial protein acetylation level to protect mitochondria from various types of damage. SIRT3 can retard or inhibit the process of organ fibrosis by regulating mitochondrial metabolism, oxidative stress, mitochondrial dynamics, mitochondrial DNA damage, autophagy and apoptosis.