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Experimental evidence that pristanic acid disrupts mitochondrial homeostasis in brain of young rats.
MedLine Citation:
PMID:  22183871     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Patients affected by peroxisomal disorders commonly present neurologic dysfunction and brain abnormalities, whose neuropathology is poorly understood. Given that high sustained concentrations of pristanic acid (Prist) are found in the brain of these patients, it is conceivable that this complex branched-chain fatty acid is neurotoxic. Therefore, the present work investigated the in vitro effects of Prist at similar concentrations found in plasma of affected patients with some peroxisomal disorders on important parameters of energy homeostasis, including respiratory parameters determined by oxygen consumption, membrane potential (ΔΨm), NAD(P)H content, and swelling in mitochondrial preparations obtained from brain of young rats using glutamate plus malate or succinate as respiratory substrates. Prist markedly increased state 4 respiration and decreased state 3 respiration, the respiratory control ratio (RCR), and the ADP/O ratio with both substrates. The mitochondrial ΔΨm and the matrix NAD(P)H content were also decreased by Prist, which was also able to provoke mitochondrial swelling. Furthermore, Prist-induced mitochondrial swelling was dependent on oxidative damage to the permeability transition pore (PTP), because cyclosporine A and the thiol-reducing agent N-acetylcysteine totally prevented mitochondrial swelling. These data suggest that Prist impairs mitochondrial homeostasis, acting as an uncoupler of oxidative phosphorylation and as a metabolic inhibitor, besides causing mitochondrial swelling probably mediated by the permeability transition pore. It is proposed that these pathomechanisms may potentially be involved in the neurological abnormalities characteristic of the peroxisomal diseases in which Prist accumulates. © 2011 Wiley Periodicals, Inc.
Authors:
Estela Natacha Brandt Busanello; Alexandre Umpierrez Amaral; Anelise Miotti Tonin; Mateus Grings; Alana Pimentel Moura; Paula Eichler; Carmen Regla Vargas; Moacir Wajner
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-20
Journal Detail:
Title:  Journal of neuroscience research     Volume:  -     ISSN:  1097-4547     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7600111     Medline TA:  J Neurosci Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Wiley Periodicals, Inc.
Affiliation:
Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
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