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See detailThe mitochondrial respiratory chain of the secondary green alga Euglena gracilis shares many additional subunits with parasitic Trypanosomatidae.
Perez, Emilie ULg; Lapaille, Marie; Degand, Herve et al

in Mitochondrion (2014)

The mitochondrion is an essential organelle for the production of cellular ATP in most eukaryotic cells. It is extensively studied, including in parasitic organisms such as trypanosomes, as a potential ... [more ▼]

The mitochondrion is an essential organelle for the production of cellular ATP in most eukaryotic cells. It is extensively studied, including in parasitic organisms such as trypanosomes, as a potential therapeutic target. Recently, numerous additional subunits of the respiratory-chain complexes have been described in Trypanosoma brucei and Trypanosoma cruzi. Since these subunits had apparently no counterparts in other organisms, they were interpreted as potentially associated with the parasitic trypanosome lifestyle. Here we used two complementary approaches to characterise the subunit composition of respiratory complexes in Euglena gracilis, a non-parasitic secondary green alga related to trypanosomes. First, we developed a phylogenetic pipeline aimed at mining sequence databases for identifying homologs to known respiratory-complex subunits with high confidence. Second, we used MS/MS proteomics after two-dimensional separation of the respiratory complexes by Blue Native- and SDS-PAGE to both confirm in silico predictions and to identify further additional subunits. Altogether, we identified 41 subunits that are restricted to E. gracilis, T. brucei and T. cruzi, along with 48 classical subunits described in other eukaryotes (i.e. plants, mammals and fungi). This moreover demonstrates that at least half of the subunits recently reported in T. brucei and T. cruzi are actually not specific to Trypanosomatidae, but extend at least to other Euglenozoa, and that their origin and function are thus not specifically associated with the parasitic lifestyle. Furthermore, preliminary biochemical analyses suggest that some of these additional subunits underlie the peculiarities of the respiratory chain observed in Euglenozoa. [less ▲]

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See detailMitochondrial transformation and in vitro DNA delivery
Remacle, Claire ULg; Hamel, Patrice; Larosa, Véronique ULg et al

in Bock, R; Knoop, V (Eds.) Genomics of Chloroplasts and Mitochondria (2012)

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See detailMitochondrial Translation in Green Algae and Higher Plants
Salinas, Thalia; Remacle, Claire ULg; Maréchal-Drouard, Laurence

in Duchêne, A-M (Ed.) Translation in mitochondria and other organelles (2013)

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See detailMitochondrial UCPs: New insights into regulation and impact
Sluse, Francis ULg; Jarmuszkiewicz, Wieslawa; Navet, Rachel ULg et al

in Biochimica et Biophysica Acta-Bioenergetics (2006), 1757(5-6, Suppl 1), 101

Uncoupling proteins (UCPs) are mitochondrial inner membrane proteins sustaining an inducible proton conductance. They weaken the proton electrochemical gradient built up by the mitochondrial respiratory ... [more ▼]

Uncoupling proteins (UCPs) are mitochondrial inner membrane proteins sustaining an inducible proton conductance. They weaken the proton electrochemical gradient built up by the mitochondrial respiratory chain. Brown fat UCP1 sustains a free fatty acid (FA)-induced purine nucleotide (PN)-inhibited proton conductance. Inhibition of the proton conductance by PN has been considered as a diagnostic of UCP activity. However, conflicting results have been obtained in isolated mitochondria for UCP homologues (i.e., UCP2, UCP3, plant UCP, and protist UCP) where the FFA-activated proton conductance is poorly sensitive to PN under resting respiration conditions. Our recent work clearly indicates that the membranous coenzyme Q, through its redox state, represents a regulator of the inhibition by PN of FFA-activated UCP1 homologues under phosphorylating respiration conditions. Several physiological roles of UCPs have been suggested, including a control of the cellular energy balance as well as the preventive action against oxidative stress. In this paper, we discuss new information emerging from comparative proteomics about the impact of UCPs on mitochondrial physiology, when recombinant UCP1 is expressed in yeast and when UCP2 is over-expressed in hepatic mitochondria during steatosis [less ▲]

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See detailMitochondrial uncoupling proteins: new insights from functional and proteomic studies.
Douette, P.; Sluse, Francis ULg

in Free Radical Biology & Medicine (2006), 40

Mitochondria are the major sites of ATP synthesis through oxidative phosphorylation, a process that is weakened by proton leak. Uncoupling proteins are mitochondrial membrane proteins specialized in ... [more ▼]

Mitochondria are the major sites of ATP synthesis through oxidative phosphorylation, a process that is weakened by proton leak. Uncoupling proteins are mitochondrial membrane proteins specialized in inducible proton conductance. They dissipate the proton electrochemical gradient established by the respiratory chain at the expense of reducing substrates. Several physiological roles have been suggested for uncoupling proteins, including roles in the control of the cellular energy balance and in preventive action against oxidative stress. This review focuses on new leads emerging from comparative proteomics about the involvement of uncoupling protein in the mitochondrial physiology. A brief overview on uncoupling proteins and on proteomics applied to mitochondria is also presented herein. [less ▲]

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See detailMitochondrion plasticity evidenced by coupled comparisons of mitochondrial and cellular proteomes
Mathy, Grégory ULg

Poster (2007, May 16)

Mitochondria are key organelles in primary metabolism: they are the main source of energy production and the starting point of important biosynthetic pathways. Thus the control of the mitochondrial ... [more ▼]

Mitochondria are key organelles in primary metabolism: they are the main source of energy production and the starting point of important biosynthetic pathways. Thus the control of the mitochondrial function is a prerequisite for cellular survival in front of a wide spectrum of exogenous or endogenous stresses. By using the SILAC method, we have investigated the yeast mitochondrial and cellular proteome adaptation to the heterologous expression of a mitochondrial alternative oxidase (AOX). AOX is an energy dissipating enzyme that catalyses the re-oxidation of ubiquinol within the respiratory chain and compete with the Cytochrome pathway for electrons and thus, prevents proton pumping, and consequently leads to a decrease in ATP synthesis. [less ▲]

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See detailMitochondrion- and endoplasmic reticulum-induced SK channel dysregulation as a potential origin of the selective neurodegeneration in Parkinson’s disease
Drion, Guillaume ULg; Sepulchre, Rodolphe ULg; Seutin, Vincent ULg

in Wellstead, Peter; Cloutier, Mathieu (Eds.) The Systems Biology of Parkinson's Disease (2012)

Mitochondrial dysfunction and metabolic issues are known to have strong implications in the pathogenesis of Parkinson’s disease (PD). But it is also known that the neuronal loss leading to PD symptoms is ... [more ▼]

Mitochondrial dysfunction and metabolic issues are known to have strong implications in the pathogenesis of Parkinson’s disease (PD). But it is also known that the neuronal loss leading to PD symptoms is selective for particular areas of the brain. In particular, the characteristic motor symptoms of PD are mainly due to abnormal neuronal activity in the basal ganglia, through the degeneration of substantia nigra pars compacta (SNc), but not ventral tegmental area (VTA), dopaminergic (DA) neurons. How a metabolic dysfunction triggers such a selective loss is considered from a range of perspectives in several contributions to this volume. The aim of this chapter is to investigate the potential role of small conductance calcium-activated potassium (SK) channels in this selective degeneration. Based on a recently proposed model and experimental data, we underline the fundamental role of SK channels in regulating the excitability of SNc DA neurons. The fact that SK channels do not play this regulating role in VTA DA neurons suggests the hypothesis that one reason for the preferential vulnerability of SNc DA neurons in Parkinson’s disease is that SK channels, which have a profound influence on their firing physiologically, are dysregulated by a dysfunction of mitochondria and/or endoplasmic reticulum. [less ▲]

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See detailMitogen-activated lymphocytes: a good model for characterising lung CYP1A1 inducibility
Jacquet, Michèle; LAMBERT, Vincent ULg; Todaro, Anne et al

in European Journal of Epidemiology (1997), 13

The CYP1A1 hyperinducibility phenotype occurring in some 10% of the human population corresponds to a higher risk of developing lung cancer. This study was undertaken to assess whether the inducibility ... [more ▼]

The CYP1A1 hyperinducibility phenotype occurring in some 10% of the human population corresponds to a higher risk of developing lung cancer. This study was undertaken to assess whether the inducibility factor, generally evaluated on mito- gen-activated lymphocytes after PAH induction, represents correctly the lung situation. Optimal experimental conditions were determined for evalu- ating, on both lymphocytes and lung tissue explants, the inducibility factor, defined as the ratio of EROD activity (CYP1A1-specific) to cytochrome c reduc- tase activity (unaffected by PAH induction). Paired results for lymphocytes and lung tissue samples from 10 lung cancer patients were compared. A good correlation was observed between lymphocyte and lung tissue inducibilities (R = 0.809; p = 0.005). In conclusion, mitogen-activated lymphocyte induci- bility is indicative of lung tissue inducibility and constitutes a good marker for evaluating individual PAH inducibilities. [less ▲]

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See detailMitogen-Activated Lymphocytes: A Good Model for Characterising Lung Cyp1a1 Inducibility
Lambert, Vincent ULg; Todaro, Anna ULg; Kremers, Pierre ULg et al

in European Journal of Epidemiology (1997), 13(2), 177-83

The CYP1A1 hyperinducibility phenotype occurring in some 10% of the human population corresponds to a higher risk of developing lung cancer. This study was undertaken to assess whether the inducibility ... [more ▼]

The CYP1A1 hyperinducibility phenotype occurring in some 10% of the human population corresponds to a higher risk of developing lung cancer. This study was undertaken to assess whether the inducibility factor, generally evaluated on mitogen-activated lymphocytes after PAH induction, represents correctly the lung situation. Optimal experimental conditions were determined for evaluating, on both lymphocytes and lung tissue explants, the inducibility factor, defined as the ratio of EROD activity (CYP1A1-specific) to cytochrome c reductase activity (unaffected by PAH induction). Paired results for lymphocytes and lung tissue samples from 10 lung cancer patients were compared. A good correlation was observed between lymphocyte and lung tissue inducibilities (R = 0.809; p = 0.005). In conclusion, mitogen-activated lymphocyte inducibility is indicative of lung tissue inducibility and constitutes a good marker for evaluating individual PAH inducibilities. [less ▲]

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See detailMitoproteome plasticity of rat brown adipocytes in response to cold acclimation
Navet, Rachel ULg; Mathy, Grégory ULg; Douette, Pierre ULg et al

in Journal of Proteome Research (2007), 6(1), 25-33

Cold acclimation induces an adaptative increase in respiration in brown adipose tissue (BAT). A comparative analysis by two-dimensional differential in-gel electrophoresis of mitochondrial protein ... [more ▼]

Cold acclimation induces an adaptative increase in respiration in brown adipose tissue (BAT). A comparative analysis by two-dimensional differential in-gel electrophoresis of mitochondrial protein patterns found in rat control and cold-acclimated BAT was performed. A total of 58 proteins exhibiting significant differences in their abundance was unambiguously identified. Proteins implicated in the major catabolic pathways were up-regulated as were ATP synthase and mitofilin. Moreover, these results support the fact that adipocytes can balance their ATP synthesis and their heat production linked to UCP1-sustained uncoupling. [less ▲]

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See detailmitotic cycling of radial glial cells of the fetal murine cerebral wall: a combined autoradiographic and immunohistochemical study.
Misson, Jean-Paul ULg; Edwards, Michael; Yamamoto, M. et al

in Developmental Brain Research (1988), 38

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See detailMitotic spindle: focus on the function of huntingtin
Godin, Juliette ULg; Humbert, Sandrine

in International Journal of Biochemistry & Cell Biology (2011), 43(6), 852-856

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See detailMitral regurgitation after transcatheter aortic valve replacement: Does the prosthesis matter?
Unger, Philippe; Dedobbeleer, Chantal; Vanden Eynden, Frederic et al

in International Journal of Cardiology (2013)

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See detailMitral regurgitation in patients with aortic stenosis undergoing valve replacement.
Unger, P.; Dedobbeleer, C.; Van Camp, G. et al

in Heart (2009)

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See detailMitral regurgitation in patients with systolic heart failure: more than a bystander
Lancellotti, Patrizio ULg; Dulgheru, R.

in Revista Espanola de Cardiologia (2011)

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See detailMitral repair versus replacement for ischemic mitral regurgitation comparison of short-term and long-term survival
Magne, Julien ULg; Girerd, N.; Sénéchal, M. et al

in Circulation (2009), 120(SUPPL. 1), 104-111

Detailed reference viewed: 7 (1 ULg)