title: In vivo and in vitro assessment of brain bioenergetics in aging rats.
abstract: Brain energy disorders can be present in aged men and animals. To this respect, the mitochondrial and free radical theory of aging postulates that age-associated brain energy disorders are caused by an imbalance between pro- and anti-oxidants that can result in oxidative stress. Our study was designed to investigate brain energy metabolism and the activity of endogenous antioxidants during their lifespan in male Wistar rats. In vivo brain bioenergetics were measured using ³¹P nuclear magnetic resonance (NMR) spectroscopy and in vitro by polarographic analysis of mitochondrial oxidative phosphorylation. When compared to the young controls, a significant decrease of age-dependent mitochondrial respiration and adenosine-3-phosphate (ATP) production measured in vitro correlated with significant reduction of forward creatine kinase reaction (kfor) and with an increase in phosphocreatine (PCr)/ATP, PCr/Pi and PME/ATP ratio measured in vivo. The levels of enzymatic antioxidants catalase, GPx and GST significantly decreased in the brain tissue as well as in the peripheral blood of aged rats. We suppose that mitochondrial dysfunction and oxidative inactivation of endogenous enzymes may participate in age-related disorders of brain energy metabolism.
authors.affiliation: Pharmacobiochemical Laboratory, Comenius University School of Medicine, Bratislava, Slovakia.
authors.forename: Ol'ga
authors.initials: O
authors.lastname: Vančová
authors.forename: Ladislav
authors.initials: L
authors.lastname: Bačiak
authors.forename: Svatava
authors.initials: S
authors.lastname: Kašparová
authors.forename: Jarmila
authors.initials: J
authors.lastname: Kucharská
authors.forename: Hector H
authors.initials: HH
authors.lastname: Palacios
authors.forename: Jaromír
authors.initials: J
authors.lastname: Horecký
authors.forename: Gjumrakch
authors.initials: G
authors.lastname: Aliev
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000375:Aging / Q000502:physiology*; D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D001921:Brain / Q000378:metabolism*; D004734:Energy Metabolism; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008928:Mitochondria / Q000378:metabolism; D010084:Oxidation-Reduction; D010085:Oxidative Phosphorylation; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000975:Antioxidants; D000255:Adenosine Triphosphate