Cecatto 2016 Toxicol In Vitro

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Cecatto C, Godoy KD, da Silva JC, Amaral AU, Wajner M (2016) Disturbance of mitochondrial functions provoked by the major long-chain 3-hydroxylated fatty acids accumulating in MTP and LCHAD deficiencies in skeletal muscle. Toxicol In Vitro 36:1-9.

» PMID: 27371118 Open Access

Cecatto C, Godoy KD, da Silva JC, Amaral AU, Wajner M (2016) Toxicol In Vitro

Abstract: The pathogenesis of the muscular symptoms and recurrent rhabdomyolysis that are commonly manifested in patients with mitochondrial trifunctional protein (MTP) and long-chain 3-hydroxy-acyl-CoA dehydrogenase (LCHAD) deficiencies is still unknown. In this study we investigated the effects of the major long-chain monocarboxylic 3-hydroxylated fatty acids (LCHFA) accumulating in these disorders, namely 3-hydroxytetradecanoic (3HTA) and 3-hydroxypalmitic (3HPA) acids, on important mitochondrial functions in rat skeletal muscle mitochondria. 3HTA and 3HPA markedly increased resting (state 4) and decreased ADP-stimulated (state 3) and CCCP-stimulated (uncoupled) respiration. 3HPA provoked similar effects in permeabilized skeletal muscle fibers, validating the results obtained in purified mitochondria. Furthermore, 3HTA and 3HPA markedly diminished mitochondrial membrane potential, NAD(P)H content and Ca2+ retention capacity in Ca2+-loaded mitochondria. Mitochondrial permeability transition (mPT) induction probably underlie these effects since they were totally prevented by cyclosporin A and ADP. In contrast, the dicarboxylic analogue of 3HTA did not alter the tested parameters. Our data strongly indicate that 3HTA and 3HPA behave as metabolic inhibitors, uncouplers of oxidative phosphorylation and mPT inducers in skeletal muscle. It is proposed that these pathomechanisms disrupting mitochondrial homeostasis may be involved in the muscle alterations characteristic of MTP and LCHAD deficiencies.

Copyright © 2016 Elsevier Ltd. All rights reserved.

Keywords: Long-chain 3-hydroxy-acyl-CoA dehydrogenase deficiency, Mitochondrial permeability transition, Mitochondrial respiration, Mitochondrial trifunctional protein deficiency, Skeletal muscle mitochondria

O2k-Network Lab: BR Porto Alegre Souza DOG


Labels: MiParea: Respiration, Pharmacology;toxicology  Pathology: Myopathy  Stress:Permeability transition  Organism: Rat  Tissue;cell: Skeletal muscle  Preparation: Permeabilized tissue, Isolated mitochondria 

Regulation: Calcium, Fatty acid  Coupling state: LEAK, OXPHOS, ET  Pathway:HRR: Oxygraph-2k 

2016-07