title: Protein Kinase C Epsilon Promotes Cerebral Ischemic Tolerance Via Modulation of Mitochondrial Sirt5.
abstract: 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 (PKCε)-mediated increases in mitochondrial Nampt and whether SIRT5 regulates mitochondrial bioenergetics and neuroprotection against cerebral ischemia. In isolated mitochondria from rat cortical cultures, PKCε activation increased SIRT5 levels and desuccinylation activity in a Nampt-dependent manner. PKCε 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 SIRT5-/- 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 PKCε-mediated protection, we compared WT and SIRT5-/- mice by employing both in vitro and in vivo ischemia paradigms. PKCε-mediated decreases in cell death following oxygen-glucose deprivation were abolished in cortical cultures harvested from SIRT5-/- mice. Furthermore, PKCε failed to prevent cortical degeneration following MCAO in SIRT5-/- mice. Collectively this demonstrates that SIRT5 is an important mitochondrial enzyme for protection against metabolic and ischemic stress following PKCε activation in the brain.
authors.affiliation: Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Neuroscience Program, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
authors.forename: Kahlilia C
authors.initials: KC
authors.lastname: Morris-Blanco
authors.affiliation: Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Neuroscience Program, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
authors.forename: Kunjan R
authors.initials: KR
authors.lastname: Dave
authors.affiliation: Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
authors.forename: Isabel
authors.initials: I
authors.lastname: Saul
authors.affiliation: Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Neuroscience Program, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
authors.forename: Kevin B
authors.initials: KB
authors.lastname: Koronowski
authors.affiliation: Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Neuroscience Program, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
authors.forename: Holly M
authors.initials: HM
authors.lastname: Stradecki
authors.affiliation: Cerebral Vascular Disease Research Laboratories, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Neuroscience Program, University of Miami Miller School of Medicine, Miami, FL 33136, USA.|Department of Neurology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Perez-Pinzon
mesh_terms: D000818:Animals; D002545:Brain Ischemia / Q000235:genetics / Q000378:metabolism*; D015687:Cell Hypoxia; D002478:Cells, Cultured; D005947:Glucose / Q000378:metabolism; D057507:Mice, 129 Strain; D018345:Mice, Knockout; D008928:Mitochondria / Q000235:genetics / Q000378:metabolism; D024101:Mitochondrial Proteins / Q000235:genetics / Q000378:metabolism*; D009474:Neurons / Q000166:cytology / Q000378:metabolism; D010101:Oxygen Consumption / Q000235:genetics; D051744:Protein Kinase C-epsilon / Q000378:metabolism*; D017207:Rats, Sprague-Dawley; D037761:Sirtuins / Q000235:genetics / Q000378:metabolism*
chemical_list: D024101:Mitochondrial Proteins; C542554:SIRT5 protein, mouse; D051744:Protein Kinase C-epsilon; D037761:Sirtuins; D005947:Glucose