Sirtuin 5 (SIRT5) is a mitochondrial-localized NAD +-dependent lysine desuccinylase and a major regulator of the mitochondrial succinylome. We wanted to determine whether SIRT5 is activated by protein kinase C epsilon (PKC?)-mediated increases in mitochondrial Nampt and whether SIRT5 regulates mitochondrial bioenergetics and neuroprotection against cerebral ischemia. In isolated mitochondria from rat cortical cultures, PKC? activation increased SIRT5 levels and desuccinylation activity in a Nampt-dependent manner. PKC? activation did not lead to significant modifications in SIRT3 activity, the major mitochondrial lysine deacetylase. Assessments of mitochondrial bioenergetics in the cortex of wild type (WT) and SIRT5â '/â ' mice revealed that SIRT5 regulates oxygen consumption in the presence of complex I, complex II, and complex IV substrates. To explore the potential role of SIRT5 in PKC?-mediated protection, we compared WT and SIRT5â '/â ' mice by employing both in vitro and in vivo ischemia paradigms. PKC?-mediated decreases in cell death following oxygen-glucose deprivation were abolished in cortical cultures harvested from SIRT5â '/â ' mice. Furthermore, PKC? failed to prevent cortical degeneration following MCAO in SIRT5â '/â ' mice. Collectively this demonstrates that SIRT5 is an important mitochondrial enzyme for protection against metabolic and ischemic stress following PKC? activation in the brain.
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