Leman 2015 Int J Biochem Cell Biol

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Leman G, Gueguen N, Desquiret-Dumas V, Kane MS, Wettervald C, Chupin S, Chevrollier A, Lebre AS, Bonnefont JP, Barth M, Amati-Bonneau P, Verny C, Henrion D, Bonneau D, Reynier P, Procaccio V (2015) Assembly defects induce oxidative stress in inherited mitochondrial complex I deficiency. Int J Biochem Cell Biol 65:91-103.

» PMID: 26024641

Leman G, Gueguen N, Desquiret-Dumas V, Kane MS, Wettervald C, Chupin S, Chevrollier A, Lebre AS, Bonnefont JP, Barth M, Amati-Bonneau P, Verny C, Henrion D, Bonneau D, Reynier P, Procaccio V (2015) Int J Biochem Cell Biol

Abstract: Complex I (CI) deficiency is the most common respiratory chain defect representing more than 30% of mitochondrial diseases. CI is an L-shaped multi-subunit complex with a peripheral arm protruding into the mitochondrial matrix and a membrane arm. CI sequentially assembled into main assembly intermediates: the P (pumping), Q (Quinone) and N (NADH dehydrogenase) modules. In this study, we analyzed 11 fibroblast cell lines derived from patients with inherited CI deficiency resulting from mutations in the nuclear or mitochondrial DNA and impacting these different modules. In patient cells carrying a mutation located in the matrix arm of CI, blue native-polyacrylamide gel electrophoresis (BN-PAGE) revealed a significant reduction of fully assembled CI enzyme and an accumulation of intermediates of the N module. In these cell lines with an assembly defect, NADH dehydrogenase activity was partly functional, even though CI was not fully assembled. We further demonstrated that this functional N module was responsible for ROS production through the reduced flavin mononucleotide. Due to the assembly defect, the FMN site was not re-oxidized leading to a significant oxidative stress in cell lines with an assembly defect. These findings not only highlight the relationship between CI assembly and oxidative stress, but also show the suitability of BN-PAGE analysis in evaluating the consequences of CI dysfunction. Moreover, these data suggest that the use of antioxidants may be particularly relevant for patients displaying a CI assembly defect.

Keywords: Mitochondria, Mitochondrial diseases, Complex I, FMN site, Oxidative stress, Assembly defects, Amplex Red

O2k-Network Lab: FR Angers Gueguen N


Labels: MiParea: Respiration, Patients 

Stress:Oxidative stress;RONS, Mitochondrial disease  Organism: Human  Tissue;cell: Endothelial;epithelial;mesothelial cell, Fibroblast  Preparation: Permeabilized cells  Enzyme: Complex I 


Pathway: N, S, CIV  HRR: Oxygraph-2k