Tricarboxylic acid cycle-sustained oxidative phosphorylation in isolated myelin vesicles.

Ravera, Silvia; Bartolucci, Martina; Calzia, Daniela; Aluigi, Maria Grazia; Ramoino, Paola; Morelli, Alessandro; Panfoli, Isabella

Ravera, Silvia; Bartolucci, Martina; Calzia, Daniela; Aluigi, Maria Grazia; Ramoino, Paola; Morelli, Alessandro; Panfoli, Isabella.

Afiliación

Ravera S; DIFAR, University of Genova, V.le Benedetto XV, 3 Genova, Italy. Electronic address: silvia.ravera@gmail.com.

Biochimie ; 95(11): 1991-8, 2013 Nov.

Article en En | MEDLINE | ID: mdl-23851157

RESUMEN

The Central Nervous System (CNS) function was shown to be fueled exclusively by oxidative phosphorylation (OXPHOS). This is in line with the sensitivity of brain to hypoxia, but less with the scarcity of the mitochondria in CNS. Consistently with the ectopic expression of FoF1-ATP synthase and the electron transfer chain in myelin, we have reported data demonstrating that isolated myelin vesicles (IMV) conduct OXPHOS. It may suggest that myelin sheath could be a site for the whole aerobic degradation of glucose. In this paper, we assayed the functionality of glycolysis and of TCA cycle enzymes in IMV purified from bovine forebrain. We found the presence and activity of all of the glycolytic and TCA cycle enzymes, comparable to those in mitochondria-enriched fractions, in the same experimental conditions. IMV also contain consistent carbonic anhydrase activity. These data suggest that myelin may be a contributor in energy supply for the axon, performing an extra-mitochondrial aerobic OXPHOS. The vision of myelin as the site of aerobic metabolism may shed a new light on many demyelinating pathologies, that cause an a yet unresolved axonal degeneration and whose clinical onset coincides with myelin development completion.

Asunto(s)

Sistema Nervioso Central/enzimología; Ciclo del Ácido Cítrico/genética; ATPasas de Translocación de Protón Mitocondriales/metabolismo; Vaina de Mielina/metabolismo; Axones/metabolismo; Sistema Nervioso Central/metabolismo; Sistema Nervioso Central/patología; Ciclo del Ácido Cítrico/fisiología; Transporte de Electrón; Glucólisis/genética; Glucólisis/fisiología; Humanos; Mitocondrias/enzimología; ATPasas de Translocación de Protón Mitocondriales/genética; Vaina de Mielina/genética; Fosforilación Oxidativa

Palabras clave

AK3; ANT; Adenylate Kinase, isoform 3; CA; CLSM; Confocal laser scanning microscopy; DCIP; EDTA; EGTA; ETC; Ethylenediaminetetraacetic acid; G6PD; Glycolysis; HEPES; IMV; M.W.; MBP; MIM; Myelin sheath; OXPHOS; Oxidative phosphorylation; SDS-PAGE; Sodium Dodecyl Sulfate-PolyAcrylamide Gel Electrophoresis; TCA cycle; TIM; Tricarboxylic Acid Cycle; adenosine nucleotide translocase; carbonic anhydrase; dichloroindophenol; electron transport chain; ethylene glycol tetraacetic acid; glucose-6-phosphate dehydrogenase; hydroxyethylpiperazine-N1-2-ethanesulfonic acid; isolated myelin vesicles; mitochondrial membrane; molecular weight; myelin basic protein; oxidative phosphorylation; translocase of the inner membrane

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Sistema Nervioso Central / Ciclo del Ácido Cítrico / ATPasas de Translocación de Protón Mitocondriales / Vaina de Mielina Límite: Humans Idioma: En Revista: Biochimie Año: 2013 Tipo del documento: Article Pais de publicación: Francia

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