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Mitochondrial respiration

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https://www.readbyqxmd.com/read/29351463/intermediary-metabolism-and-fatty-acid-oxidation-novel-targets-of-electron-transport-chain-driven-injury-during-ischemia-and-reperfusion
#1
Qun Chen, Masood S Younus, Jeremy Thompson, Ying Hu, John M Hollander, Edward J Lesnefsky
BACKGROUND: Cardiac ischemia-reperfusion (IR) damages the electron transport chain (ETC) causing mitochondrial and cardiomyocyte injury. Reversible blockade of the ETC at complex I during ischemia protects the ETC and decreases cardiac injury. In the present study, we used an unbiased proteomic approach to analyze the extent of ETC-driven mitochondrial injury during IR. METHODS: Isolated-perfused mouse (C57BL/6) hearts underwent 25 min global ischemia (37{degree sign}C) and 30 min reperfusion...
December 29, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351410/hypoxia-selectively-upregulates-cation-channels-and-increases-cytosolic-ca2-in-pulmonary-but-not-coronary-arterial-smooth-muscle-cells
#2
Xi He, Shanshan Song, Ramon J Ayon, Angela Balisterieri, Stephen M Black, Ayako Makino, W Gil Wier, Wei-Jin Zang, Jason X-J Yuan
Ca2+ signaling, particularly the mechanism via store-operated Ca2+ entry (SOCE) and receptor-operated Ca2+ entry (ROCE), plays a critical role in the development of acute hypoxia-induced pulmonary vasoconstriction and chronic hypoxia-induced pulmonary hypertension. This study aimed to test the hypothesis that chronic hypoxia differentially regulates the expression of proteins that mediate SOCE and ROCE (STIM, Orai, and TRPC6) in pulmonary (PASMC) and coronary (CASMC) artery smooth muscle cells. The resting cytosolic [Ca2+] ([Ca2+]cyt) and the stored [Ca2+] in the sarcoplasmic reticulum (SR) were not different in CASMC and PASMC...
January 3, 2018: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29348686/defects-in-the-mitochondrial-trna-modification-enzymes-mto1-and-gtpbp3-promote-different-metabolic-reprogramming-through-a-hif-ppar%C3%AE-ucp2-ampk-axis
#3
Rachid Boutoual, Salvador Meseguer, Magda Villarroya, Elena Martín-Hernández, Mohammed Errami, Miguel A Martín, Marta Casado, M-Eugenia Armengod
Human proteins MTO1 and GTPBP3 are thought to jointly catalyze the modification of the wobble uridine in mitochondrial tRNAs. Defects in each protein cause infantile hypertrophic cardiomyopathy with lactic acidosis. However, the underlying mechanisms are mostly unknown. Using fibroblasts from an MTO1 patient and MTO1 silenced cells, we found that the MTO1 deficiency is associated with a metabolic reprogramming mediated by inactivation of AMPK, down regulation of the uncoupling protein 2 (UCP2) and transcription factor PPARγ, and activation of the hypoxia inducible factor 1 (HIF-1)...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348607/evaluation-of-mitochondrial-bioenergetics-dynamics-endoplasmic-reticulum-mitochondria-crosstalk-and-reactive-oxygen-species-in-fibroblasts-from-patients-with-complex-i-deficiency
#4
Guilhian Leipnitz, Al-Walid Mohsen, Anuradha Karunanidhi, Bianca Seminotti, Vera Y Roginskaya, Desiree M Markantone, Mateus Grings, Stephanie J Mihalik, Peter Wipf, Bennett Van Houten, Jerry Vockley
Mitochondrial complex I (CI) deficiency is the most frequent cause of oxidative phosphorylation (OXPHOS) disorders in humans. In order to benchmark the effects of CI deficiency on mitochondrial bioenergetics and dynamics, respiratory chain (RC) and endoplasmic reticulum (ER)-mitochondria communication, and superoxide production, fibroblasts from patients with mutations in the ND6, NDUFV1 or ACAD9 genes were analyzed. Fatty acid metabolism, basal and maximal respiration, mitochondrial membrane potential, and ATP levels were decreased...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348439/dual-suppression-of-inner-and-outer-mitochondrial-membrane-functions-augments-apoptotic-responses-to-oncogenic-mapk-inhibition
#5
Madhavika N Serasinghe, Jesse D Gelles, Kent Li, Lauren Zhao, Franco Abbate, Marie Syku, Jarvier N Mohammed, Brateil Badal, Cuahutlehuanitzin A Rangel, Kyle L Hoehn, Julide Tok Celebi, Jerry Edward Chipuk
Mitogen-activated protein kinase (MAPK) pathway inhibitors show promise in treating melanoma, but are unsuccessful in achieving long-term remission. Concordant with clinical data, BRAFV600E melanoma cells eliminate glycolysis upon inhibition of BRAFV600E or MEK with the targeted therapies Vemurafenib or Trametinib, respectively. Consequently, exposure to these therapies reprograms cellular metabolism to increase mitochondrial respiration and restrain cell death commitment. As the inner mitochondrial membrane (IMM) is sub-organellar site of oxidative phosphorylation (OXPHOS), and the outer mitochondrial membrane (OMM) is the major site of anti-apoptotic BCL-2 protein function, we hypothesized that suppressing these critical mitochondrial membrane functions would be a rational approach to maximize the pro-apoptotic effect of MAPK inhibition...
January 18, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29346537/cerebral-mitochondrial-dysfunction-associated-with-deep-hypothermic-circulatory-arrest-in-neonatal-swine
#6
Constantine D Mavroudis, Michael Karlsson, Tiffany Ko, Marco Hefti, Javier I Gentile, Ryan W Morgan, Ross Plyler, Kobina G Mensah-Brown, Timothy W Boorady, Richard W Melchior, Tami M Rosenthal, Brandon C Shade, Kellie L Schiavo, Susan C Nicolson, Thomas L Spray, Robert M Sutton, Robert A Berg, Daniel J Licht, J William Gaynor, Todd J Kilbaugh
OBJECTIVES: Controversy remains regarding the use of deep hypothermic circulatory arrest (DHCA) in neonatal cardiac surgery. Alterations in cerebral mitochondrial bioenergetics are thought to contribute to ischaemia-reperfusion injury in DHCA. The purpose of this study was to compare cerebral mitochondrial bioenergetics for DHCA with deep hypothermic continuous perfusion using a neonatal swine model. METHODS: Twenty-four piglets (mean weight 3.8 kg) were placed on cardiopulmonary bypass (CPB): 10 underwent 40-min DHCA, following cooling to 18°C, 10 underwent 40 min DHCA and 10 remained at deep hypothermia for 40 min; animals were subsequently rewarmed to normothermia...
January 15, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29345197/neonatal-hyperoxia-depletes-pulmonary-vein-cardiomyocytes-in-adult-mice-via-mitochondrial-oxidation
#7
Min Yee, Ethan David Cohen, William Domm, George A Porter, Andrew N McDavid, Michael A O'Reilly
Supplemental oxygen given to preterm infants has been associated with permanently altering postnatal lung development. Now that these individuals are reaching adulthood, there is growing concern that early-life oxygen exposure may also promote cardiovascular disease through poorly understood mechanisms. We previously reported that adult mice exposed to 100% oxygen between postnatal days 0-4 develop pulmonary hypertension defined pathologically by capillary rarefaction, dilation of arterioles and veins, cardiac failure, and a reduced lifespan...
January 18, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29343702/analysis-of-mitochondrial-function-in-human-induced-pluripotent-stem-cells-from-patients-with-mitochondrial-diabetes-due-to-the-a3243g-mutation
#8
Masaki Matsubara, Hajime Kanda, Hiromi Imamura, Mayumi Inoue, Michio Noguchi, Kiminori Hosoda, Akira Kakizuka, Kazuwa Nakao
We previously established human induced pluripotent stem (iPS) cells in two diabetic patients from different families with the mitochondrial A3243G mutation and isolated isogenic iPS cell clones with either undetectable or high levels of the mutation in both patients. In the present study, we analyzed the mitochondrial functions of two mutation-undetectable and two mutation-high clones in each patient through four methods to assess complex I activity, mitochondrial membrane potential, mitochondrial respiration, and mitochondrial ATP production...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343549/intracellular-vesicle-trafficking-plays-an-essential-role-in-mitochondrial-quality-control
#9
Mike Gerards, Giuseppe Cannino, Jose M González de Cózar, Howard T Jacobs
The Drosophila gene products Bet1, Slh and CG10144, predicted to function in intracellular vesicle trafficking, were previously found to be essential for mitochondrial nucleoid maintenance. Here we show that Slh and Bet1 co-operate to maintain mitochondrial functions. In their absence, mitochondrial content, membrane potential and respiration became abnormal, accompanied by mitochondrial proteotoxic stress, but without direct effects on mtDNA. Immunocytochemistry showed that both Slh and Bet1 are localized at the Golgi, together with a proportion of Rab5-positive vesicles...
January 17, 2018: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/29343498/the-gpr120-agonist-tug-891-promotes-metabolic-health-by-stimulating-mitochondrial-respiration-in-brown-fat
#10
Maaike Schilperoort, Andrea D van Dam, Geerte Hoeke, Irina G Shabalina, Anthony Okolo, Aylin C Hanyaloglu, Lea H Dib, Isabel M Mol, Natarin Caengprasath, Yi-Wah Chan, Sami Damak, Anne Reifel Miller, Tamer Coskun, Bharat Shimpukade, Trond Ulven, Sander Kooijman, Patrick Cn Rensen, Mark Christian
Brown adipose tissue (BAT) activation stimulates energy expenditure in human adults, which makes it an attractive target to combat obesity and related disorders. Recent studies demonstrated a role for G protein-coupled receptor 120 (GPR120) in BAT thermogenesis. Here, we investigated the therapeutic potential of GPR120 agonism and addressed GPR120-mediated signaling in BAT We found that activation of GPR120 by the selective agonist TUG-891 acutely increases fat oxidation and reduces body weight and fat mass in C57Bl/6J mice...
January 17, 2018: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/29342317/osteoblast-like-mc3t3-e1-cells-prefer-glycolysis-for-atp-production-but-adipocyte-like-3t3-l1-cells-prefer-oxidative-phosphorylation
#11
Anyonya R Guntur, Akos A Gerencser, Phuong T Le, Victoria E DeMambro, Sheila A Bornstein, Shona A Mookerjee, David E Maridas, David E Clemmons, Martin D Brand, Clifford J Rosen
Mesenchymal stromal cells (MSCs) are early progenitors that can differentiate into osteoblasts, chondrocytes and adipocytes. We hypothesized that osteoblasts and adipocytes utilize distinct bioenergetic pathways during MSC differentiation. To test this hypothesis, we compared the bioenergetic profiles of pre-osteoblast MC3T3-E1 cells and calvarial osteoblasts with pre-adipocyte 3T3L1 cells, before and after differentiation. Differentiated MC3T3-E1 osteoblasts met ATP demand mainly by glycolysis with minimal reserve glycolytic capacity, whereas non-differentiated cells generated ATP through oxidative phosphorylation...
January 17, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29339725/tgr5-signalling-promotes-mitochondrial-fission-and-beige-remodelling-of-white-adipose-tissue
#12
Laura A Velazquez-Villegas, Alessia Perino, Vera Lemos, Marika Zietak, Mitsunori Nomura, Thijs Willem Hendrik Pols, Kristina Schoonjans
Remodelling of energy storing white fat into energy expending beige fat could be a promising strategy to reduce adiposity. Here, we show that the bile acid-responsive membrane receptor TGR5 mediates beiging of the subcutaneous white adipose tissue (scWAT) under multiple environmental cues including cold exposure and prolonged high-fat diet feeding. Moreover, administration of TGR5-selective bile acid mimetics to thermoneutral housed mice leads to the appearance of beige adipocyte markers and increases mitochondrial content in the scWAT of Tgr5 +/+ mice but not in their Tgr5 -/- littermates...
January 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29339557/chronic-dietary-creatine-enhances-hippocampal-dependent-spatial-memory-bioenergetics-and-levels-of-plasticity-related-proteins-associated-with-nf-%C3%AE%C2%BAb
#13
Wanda M Snow, Chris Cadonic, Claudia Cortes-Perez, Subir K Roy Chowdhury, Jelena Djordjevic, Ella Thomson, Michael J Bernstein, Miyoung Suh, Paul Fernyhough, Benedict C Albensi
The brain has a high demand for energy, of which creatine (Cr) is an important regulator. Studies document neurocognitive benefits of oral Cr in mammals, yet little is known regarding their physiological basis. This study investigated the effects of Cr supplementation (3%, w/w) on hippocampal function in male C57BL/6 mice, including spatial learning and memory in the Morris water maze and oxygen consumption rates from isolated mitochondria in real time. Levels of transcription factors and related proteins (CREB, Egr1, and IκB to indicate NF-κB activity), proteins implicated in cognition (CaMKII, PSD-95, and Egr2), and mitochondrial proteins (electron transport chain Complex I, mitochondrial fission protein Drp1) were probed with Western blotting...
February 2018: Learning & Memory
https://www.readbyqxmd.com/read/29337141/alterations-of-oxygen-consumption-and-extracellular-acidification-rates-by-glutamine-in-pbmcs-of-sle-patients
#14
Hui-Ting Lee, Chen-Sung Lin, Siao-Cian Pan, Tsai-Hung Wu, Chyou-Shen Lee, Deh-Ming Chang, Chang-Youh Tsai, Yau-Huei Wei
We evaluated plasma glutamine levels and basal mitochondrial oxygen consumption rate (mOCRB) and basal extracellular acidification rate (ECARB) of peripheral blood mononuclear cells (PBMCs) of systemic lupus erythematous (SLE) patients and healthy controls (HCs). Lower plasma glutamine levels correlated with higher SLE disease activity indexes (p=0.025). Incubated in DMEM containing 100mg/dL glucose, SLE-PBMCs displayed lower mOCRB (p=0.018) but similar ECARB (p=0.467) to those of HC-PBMCs, and their mOCRB got elevated (p<0...
January 11, 2018: Mitochondrion
https://www.readbyqxmd.com/read/29336204/continuous-infusion-of-phenelzine-cyclosporine-a-or-the-combination-evaluation-of-mitochondrial-bioenergetics-oxidative-damage-and-cytoskeletal-degradation-following-severe-controlled-cortical-impact-traumatic-brain-injury-in-rats
#15
Jacqueline Renee Kulbe, Indrapal N Singh, Juan Wang, John E Cebak, Edward D Hall
To date, all monotherapy clinical traumatic brain injury (TBI) trials have failed, and there are currently no FDA-approved pharmacotherapies for the acute treatment of severe traumatic brain injury (TBI). Due to the complex secondary injury cascade following injury, there is a need to develop multi-mechanistic combinational neuroprotective approaches for the treatment of acute TBI. As central mediators of the TBI secondary injury cascade, both mitochondria and lipid peroxidation-derived aldehydes make promising therapeutic targets...
January 16, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29335583/the-effect-of-differentiation-and-tgf%C3%AE-on-mitochondrial-respiration-and-mitochondrial-enzyme-abundance-in-cultured-primary-human-skeletal-muscle-cells
#16
Christoph Hoffmann, Selina Höckele, Lisa Kappler, Martin Hrabĕ de Angelis, Hans-Ulrich Häring, Cora Weigert
Measuring mitochondrial respiration in cultured cells is a valuable tool to investigate the influence of physiological and disease-related factors on cellular metabolism; however, the details of the experimental workflow greatly influence the informative value of the results. Working with primary cells and cell types capable of differentiation can be particularly challenging. We present a streamlined workflow optimised for investigation of primary human skeletal muscle cells. We applied the workflow to differentiated and undifferentiated cells and we investigated the effect of TGFβ1 treatment...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335528/exd2-governs-germ-stem-cell-homeostasis-and-lifespan-by-promoting-mitoribosome-integrity-and-translation
#17
Joana Silva, Suvi Aivio, Philip A Knobel, Laura J Bailey, Andreu Casali, Maria Vinaixa, Isabel Garcia-Cao, Étienne Coyaud, Alexis A Jourdain, Pablo Pérez-Ferreros, Ana M Rojas, Albert Antolin-Fontes, Sara Samino-Gené, Brian Raught, Acaimo González-Reyes, Lluís Ribas de Pouplana, Aidan J Doherty, Oscar Yanes, Travis H Stracker
Mitochondria are subcellular organelles that are critical for meeting the bioenergetic and biosynthetic needs of the cell. Mitochondrial function relies on genes and RNA species encoded both in the nucleus and mitochondria, and on their coordinated translation, import and respiratory complex assembly. Here, we characterize EXD2 (exonuclease 3'-5' domain-containing 2), a nuclear-encoded gene, and show that it is targeted to the mitochondria and prevents the aberrant association of messenger RNAs with the mitochondrial ribosome...
January 15, 2018: Nature Cell Biology
https://www.readbyqxmd.com/read/29330589/impact-of-valve-less-vs-standard-insufflation-on-pneumoperitoneum-volume-inflammation-and-peritoneal-physiology-in-a-laparoscopic-sigmoid-resection-experimental-model
#18
Michele Diana, Eric Noll, Andras Legnèr, Seong-Ho Kong, Yu-Yin Liu, Luigi Schiraldi, Francesco Marchegiani, Jordan Bano, Bernard Geny, Anne-Laure Charles, Bernard Dallemagne, Véronique Lindner, Didier Mutter, Pierre Diemunsch, Jacques Marescaux
BACKGROUND: Standard insufflators compensate for intra-abdominal pressure variations with pressure spikes. Our aim was to evaluate the impact of a stable, low-pressure pneumoperitoneum induced by a valve-less insufflator, on working space, hemodynamics, inflammation, and peritoneal physiology, in a model of laparoscopic sigmoid resection. MATERIALS AND METHODS: Twelve pigs (47 ± 3.3 kg) were equipped for invasive hemodynamic monitoring and randomly assigned to Standard (n = 6) vs...
January 12, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29330372/non-estrogenic-xanthohumol-derivatives-mitigate-insulin-resistance-and-cognitive-impairment-in-high-fat-diet-induced-obese-mice
#19
Cristobal L Miranda, Lance A Johnson, Oriane de Montgolfier, Valerie D Elias, Lea S Ullrich, Joshua J Hay, Ines L Paraiso, Jaewoo Choi, Ralph L Reed, Johana S Revel, Chrissa Kioussi, Gerd Bobe, Urszula T Iwaniec, Russell T Turner, Benita S Katzenellenbogen, John A Katzenellenbogen, Paul R Blakemore, Adrian F Gombart, Claudia S Maier, Jacob Raber, Jan F Stevens
Xanthohumol (XN), a prenylated flavonoid from hops, improves dysfunctional glucose and lipid metabolism in animal models of metabolic syndrome (MetS). However, its metabolic transformation into the estrogenic metabolite, 8-prenylnaringenin (8-PN), poses a potential health concern for its use in humans. To address this concern, we evaluated two hydrogenated derivatives, α,β-dihydro-XN (DXN) and tetrahydro-XN (TXN), which showed negligible affinity for estrogen receptors α and β, and which cannot be metabolically converted into 8-PN...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330265/fgfr3-tacc3-activates-mitochondrial-respiration-via-pin4-phosphorylation
#20
(no author information available yet)
PIN4 is a FGFR3-TACC3 substrate required for ROS-mediated induction of PGCIα and tumor growth.
January 12, 2018: Cancer Discovery
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