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Padilla J, Vazquez EJ, Updegraff KA, Umaña-Taylor AJ, McHale SM. Mexican-origin youth's ethnic-racial identity development: The role of siblings. Dev Psychol 2020; 57:302-308. [PMID: 33346675 DOI: 10.1037/dev0001072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Ethnic-racial identity (ERI) formation is an important developmental task. Although families are a primary context for ERI socialization, little is known about siblings' role. Accordingly, we applied the Actor-Partner Interdependence Model to longitudinal data from 2 siblings to examine the links between siblings' ERI exploration, resolution, and affirmation. Participants were Mexican-origin mothers, fathers, and 2 siblings (older siblings Mage = 20.65 years; younger siblings Mage = 17.72 years) from 246 families in Arizona who were interviewed on 2 occasions across 2 years. Siblings' ERI exploration in late adolescence positively predicted young adult ERI, accounting for mothers' and fathers' ERIs. For resolution, the sibling (i.e., partner) effect was moderated by sibling gender constellation, such that the sibling effect emerged only for same-sex dyads. For affirmation, the sibling effect emerged for older but not younger siblings. These findings highlight the need to understand siblings' role in ERI and to expand research on family socialization of ERI beyond parents. (PsycInfo Database Record (c) 2021 APA, all rights reserved).
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Affiliation(s)
- Jenny Padilla
- T. Denny Sanford School of Social and Family Dynamics, Arizona State University
| | - Edwin J Vazquez
- T. Denny Sanford School of Social and Family Dynamics, Arizona State University
| | | | | | - Susan M McHale
- Department of Human Development and Family Studies, The Pennsylvania State University
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2
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Mekala NK, Kurdys J, Depuydt MM, Vazquez EJ, Rosca MG. Apoptosis inducing factor deficiency causes retinal photoreceptor degeneration. The protective role of the redox compound methylene blue. Redox Biol 2018; 20:107-117. [PMID: 30300862 PMCID: PMC6175772 DOI: 10.1016/j.redox.2018.09.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 09/25/2018] [Accepted: 09/27/2018] [Indexed: 01/06/2023] Open
Abstract
Dysfunction in mitochondrial oxidative phosphorylation (OXPHOS) underlies a wide spectrum of human ailments known as mitochondrial diseases. Deficiencies in complex I of the electron transport chain (ETC) contribute to 30–40% of all cases of mitochondrial diseases, and leads to eye disease including optic nerve atrophy and retinal degeneration. The mechanisms responsible for organ damage in mitochondrial defects may include energy deficit, oxidative stress, and an increase in the NADH/NAD+ redox ratio due to decreased NAD+ regeneration. Currently, there is no effective treatment to alleviate human disease induced by complex I defect. Photoreceptor cells have the highest energy demand and dependence on OXPHOS for survival, and the lowest reserve capacity indicating that they are sensitive to OXPHOS defects. We investigated the effect of mitochondrial OXPHOS deficiency on retinal photoreceptors in a model of mitochondrial complex I defect (apoptosis inducing factor, AIF-deficient mice, Harlequin mice), and tested the protective effect of a mitochondrial redox compound (methylene blue, MB) on mitochondrial and photoreceptor integrity. MB prevented the reduction in the retinal thickness and protein markers for photoreceptor outer segments, Muller and ganglion cells, and altered mitochondrial integrity and function induced by AIF deficiency. In rotenone-induced complex I deficient 661 W cells (an immortalized mouse photoreceptor cell line) MB decreased the NADH/NAD+ ratio and oxidative stress without correcting the energy deficit, and improved cell survival. MB deactivated the mitochondrial stress response pathways, the unfolding protein response and mitophagy. In conclusion, preserving mitochondrial structure and function alleviates retinal photoreceptor degeneration in mitochondrial complex I defect. Mitochondrial complex I causes damage of the retinal photoreceptor cells and their outer segments. Methylene blue decreases the NADH/ NAD+ ratio and oxidative stress induced by complex I defect. Methylene blue deactivates the mitochondrial stress response pathways. Methylene blue maintains mitochondrial integrity and function. Methylene blue improves photoreceptor cell survival and outer segment integrity.
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Affiliation(s)
- Naveen K Mekala
- Department of Foundational Sciences at Central Michigan University College of Medicine, Mount Pleasant, MI, United States
| | - Jacob Kurdys
- Department of Foundational Sciences at Central Michigan University College of Medicine, Mount Pleasant, MI, United States
| | - Mikayla M Depuydt
- Department of Foundational Sciences at Central Michigan University College of Medicine, Mount Pleasant, MI, United States
| | - Edwin J Vazquez
- Department of Foundational Sciences at Central Michigan University College of Medicine, Mount Pleasant, MI, United States
| | - Mariana G Rosca
- Department of Foundational Sciences at Central Michigan University College of Medicine, Mount Pleasant, MI, United States.
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3
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Vazquez EJ, Berthiaume JM, Kamath V, Achike O, Buchanan E, Montano MM, Chandler MP, Miyagi M, Rosca MG. Mitochondrial complex I defect and increased fatty acid oxidation enhance protein lysine acetylation in the diabetic heart. Cardiovasc Res 2015; 107:453-65. [PMID: 26101264 DOI: 10.1093/cvr/cvv183] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 06/17/2015] [Indexed: 01/07/2023] Open
Abstract
AIMS Cardiomyopathy is a major complication of diabetes. Our study was aimed to identify the sites of mitochondrial dysfunction and delineate its consequences on mitochondrial metabolism in a model of type 1 diabetes. METHODS AND RESULTS Diabetes was induced by streptozotocin injection to male Lewis rats. We found a decrease in mitochondrial biogenesis pathway and electron transport chain complex assembly that targets Complex I. Oxidation of Complex II and long-chain fatty acid substrates support the electron leak and superoxide production. Mitochondrial defects do not limit fatty acid oxidation as the heart's preferred energy source indicating that the diabetic heart has a significant reserve in Complex I- and II-supported ATP production. Both mitochondrial fatty acid oxidation and Complex I defect are responsible for increased protein lysine acetylation despite an unchanged amount of the NAD(+)-dependent mitochondrial deacetylase sirt3. We quantitatively analysed mitochondrial lysine acetylation post-translational modifications and identified that the extent of lysine acetylation on 54 sites in 22 mitochondrial proteins is higher in diabetes compared with the same sites in the control. The increased lysine acetylation of the mitochondrial trifunctional protein subunit α may be responsible for the increased fatty acid oxidation in the diabetic heart. CONCLUSION We identified the specific defective sites in the electron transport chain responsible for the decreased mitochondrial oxidative phosphorylation in the diabetic heart. Mitochondrial protein lysine acetylation is the common consequence of both increased fatty acid oxidation and mitochondrial Complex I defect, and may be responsible for the metabolic inflexibility of the diabetic heart.
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Affiliation(s)
- Edwin J Vazquez
- Department of Nutrition, Case Western Reserve University, Cleveland, OH, USA
| | | | - Vasudeva Kamath
- Department of Foundational Sciences, Central Michigan University College of Medicine, Mount Pleasant, MI, USA
| | - Olisaemeka Achike
- Department of Foundational Sciences, Central Michigan University College of Medicine, Mount Pleasant, MI, USA
| | - Elizabeth Buchanan
- Department of Foundational Sciences, Central Michigan University College of Medicine, Mount Pleasant, MI, USA
| | - Monica M Montano
- Department of Pharmacology, Case Western Reserve University, Cleveland, OH, USA
| | - Margaret P Chandler
- Department of Physiology, Case Western Reserve University, Cleveland, OH, USA
| | - Masaru Miyagi
- Center for Proteomics and Bioinformatics, Case Western Reserve University, Cleveland, OH, USA
| | - Mariana G Rosca
- Department of Foundational Sciences, Central Michigan University College of Medicine, Mount Pleasant, MI, USA
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Howe TR, Aberson CL, Friedman HS, Murphy SE, Alcazar E, Vazquez EJ, Becker R. Three Decades Later: The Life Experiences and Mid-Life Functioning of 1980s Heavy Metal Groupies, Musicians, and Fans. Self and Identity 2015. [DOI: 10.1080/15298868.2015.1036918] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Babcook MA, Shukla S, Fu P, Vazquez EJ, Puchowicz MA, Molter JP, Oak CZ, MacLennan GT, Flask CA, Lindner DJ, Parker Y, Daneshgari F, Gupta S. Synergistic simvastatin and metformin combination chemotherapy for osseous metastatic castration-resistant prostate cancer. Mol Cancer Ther 2014; 13:2288-302. [PMID: 25122066 DOI: 10.1158/1535-7163.mct-14-0451] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Docetaxel chemotherapy remains a standard of care for metastatic castration-resistant prostate cancer (CRPC). Docetaxel modestly increases survival, yet results in frequent occurrence of side effects and resistant disease. An alternate chemotherapy with greater efficacy and minimal side effects is needed. Acquisition of metabolic aberrations promoting increased survival and metastasis in CRPC cells includes constitutive activation of Akt, loss of adenosine monophosphate-activated protein kinase (AMPK) activity due to Ser-485/491 phosphorylation, and overexpression of 3-hydroxy-3-methylglutaryl-Coenzyme A reductase (HMG-CoAR). We report that combination of simvastatin and metformin, within pharmacologic dose range (500 nmol/L to 4 μmol/L simvastatin and 250 μmol/L to 2 mmol/L metformin), significantly and synergistically reduces C4-2B3/B4 CRPC cell viability and metastatic properties, with minimal adverse effects on normal prostate epithelial cells. Combination of simvastatin and metformin decreased Akt Ser-473 and Thr-308 phosphorylation and AMPKα Ser-485/491 phosphorylation; increased Thr-172 phosphorylation and AMPKα activity, as assessed by increased Ser-79 and Ser-872 phosphorylation of acetyl-CoA carboxylase and HMG-CoAR, respectively; decreased HMG-CoAR activity; and reduced total cellular cholesterol and its synthesis in both cell lines. Studies of C4-2B4 orthotopic NCr-nu/nu mice further demonstrated that combination of simvastatin and metformin (3.5-7.0 μg/g body weight simvastatin and 175-350 μg/g body weight metformin) daily by oral gavage over a 9-week period significantly inhibited primary ventral prostate tumor formation, cachexia, bone metastasis, and biochemical failure more effectively than 24 μg/g body weight docetaxel intraperitoneally injected every 3 weeks, 7.0 μg/g/day simvastatin, or 350 μg/g/day metformin treatment alone, with significantly less toxicity and mortality than docetaxel, establishing combination of simvastatin and metformin as a promising chemotherapeutic alternative for metastatic CRPC.
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Affiliation(s)
- Melissa A Babcook
- Department of Urology, Case Western Reserve University, and The Urology Institute, University Hospitals Case Medical Center, Cleveland, Ohio. Department of Nutrition, Case Western Reserve University, Cleveland, Ohio
| | - Sanjeev Shukla
- Department of Urology, Case Western Reserve University, and The Urology Institute, University Hospitals Case Medical Center, Cleveland, Ohio
| | - Pingfu Fu
- Department of Epidemiology and Biostatistics, Case Western Reserve University, Cleveland, Ohio
| | - Edwin J Vazquez
- Mouse Metabolic Phenotyping Center, Analytical and Metabolic Core, Case Western Reserve University, Cleveland, Ohio
| | - Michelle A Puchowicz
- Department of Nutrition, Case Western Reserve University, Cleveland, Ohio. Mouse Metabolic Phenotyping Center, Analytical and Metabolic Core, Case Western Reserve University, Cleveland, Ohio
| | - Joseph P Molter
- Imaging Research Core Facility, Case Western Reserve University, Cleveland, Ohio
| | - Christine Z Oak
- Department of Biology, Case Western Reserve University, Cleveland, Ohio
| | | | - Chris A Flask
- Imaging Research Core Facility, Case Western Reserve University, Cleveland, Ohio
| | - Daniel J Lindner
- Department of Cancer Biology, Cleveland Clinic Foundation, Cleveland, Ohio
| | - Yvonne Parker
- Department of Cancer Biology, Cleveland Clinic Foundation, Cleveland, Ohio
| | - Firouz Daneshgari
- Department of Urology, Case Western Reserve University, and The Urology Institute, University Hospitals Case Medical Center, Cleveland, Ohio
| | - Sanjay Gupta
- Department of Urology, Case Western Reserve University, and The Urology Institute, University Hospitals Case Medical Center, Cleveland, Ohio. Department of Nutrition, Case Western Reserve University, Cleveland, Ohio. Division of General Medical Sciences, Case Comprehensive Cancer Center, Cleveland, Ohio.
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Babcook MA, Sramkoski RM, Vazquez EJ, Puchowicz MA, Shukla S, Gupta S. Abstract 3283: Synergistic simvastatin and metformin chemotherapy for metastatic castration-resistant prostate cancer. Cancer Res 2013. [DOI: 10.1158/1538-7445.am2013-3283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Docetaxel (Dtx), first-line chemotherapy of metastatic castration-resistant prostate cancer (CRPC), provides a modest increase in overall survival, yet results in frequent occurrence of severe side effects and leads to Dtx-resistant disease. Identification of a more effective alternate chemotherapy with fewer side effects would greatly benefit patient quality of life. Metabolic alterations occur in metastatic CRPC cells that may promote survival. 3-hydroxy-3-methylglutaryl-Coenzyme A reductase (HMG-CoAR) is over-expressed and dysregulated, leading to elevated cellular cholesterol levels. In addition, adenosine monophosphate-activated protein kinase (AMPK) activity is significantly decreased by Ser-485/491 phosphorylation, in part due to constitutively-active Akt. Simvastatin (SIM), used to treat hypercholesterolemia (HC), is a potent inhibitor of HMG-CoAR; metformin (MET) is an indirect activator of AMPK prescribed for Type II Diabetes (T2D). T2D and HC are associated with increased risk of advanced prostate cancer (PCa); whereas, SIM or MET treatment is associated with reduced risk of advanced PCa and recurrence following radical prostatectomy or androgen deprivation therapy. Moreover, SIM and MET are significantly less toxic than Dtx. SIM and MET have potential to act synergistically by i) inhibition of HMG-CoAR, ii) activation of AMPK, further inhibiting HMG-CoAR activity by Ser-872 phosphorylation, and iii) inhibition of Akt activity, which is directly upstream of AMPK. Therefore, we hypothesized that combination SIM and MET act synergistically to inhibit metastatic CRPC cell survival. Using C4-2B3 and C4-2B4 cell lines, in vitro models of osseous metastatic CRPC, we determined that (1:500) combination SIM and MET at pharmacologically-relevant concentrations (500nM-4μM and 250μM-2mM, respectively) displays strong synergy per Chou-Talalay calculation and significantly reduces C4-2B3 and B4 viability, without adversely affecting viability of PrEC normal prostate epithelial cells; combination SIM and MET was also shown to significantly inhibit metastatic CRPC cell migration, invasion, and proliferation. Compared to SIM and MET alone, combination treatment led to earlier and more pronounced G1-phase cell cycle arrest in both C4-2B3 and B4. Combination SIM and MET also synergistically increased phospho-Thr-172 and activity of AMPK, and increased phospho-Ser-872 and decreased activity of HMG-CoAR in C4-2B3 and B4 cells in a time-dependent manner. Used individually, SIM and MET show limited promise as CRPC chemotherapeutic agents; however, in combination, they demonstrate more significant, synergistic effects, and may be an effective first-line chemotherapeutic alternative to Dtx for metastatic CRPC.
Citation Format: Melissa A. Babcook, R. Michael Sramkoski, Edwin J. Vazquez, Michelle A. Puchowicz, Sanjeev Shukla, Sanjay Gupta. Synergistic simvastatin and metformin chemotherapy for metastatic castration-resistant prostate cancer. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 3283. doi:10.1158/1538-7445.AM2013-3283
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Rosca MG, Vazquez EJ, Chen Q, Kerner J, Kern TS, Hoppel CL. Oxidation of fatty acids is the source of increased mitochondrial reactive oxygen species production in kidney cortical tubules in early diabetes. Diabetes 2012; 61:2074-83. [PMID: 22586586 PMCID: PMC3402323 DOI: 10.2337/db11-1437] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mitochondrial reactive oxygen species (ROS) cause kidney damage in diabetes. We investigated the source and site of ROS production by kidney cortical tubule mitochondria in streptozotocin-induced type 1 diabetes in rats. In diabetic mitochondria, the increased amounts and activities of selective fatty acid oxidation enzymes is associated with increased oxidative phosphorylation and net ROS production with fatty acid substrates (by 40% and 30%, respectively), whereas pyruvate oxidation is decreased and pyruvate-supported ROS production is unchanged. Oxidation of substrates that donate electrons at specific sites in the electron transport chain (ETC) is unchanged. The increased maximal production of ROS with fatty acid oxidation is not affected by limiting the electron flow from complex I into complex III. The maximal capacity of the ubiquinol oxidation site in complex III in generating ROS does not differ between the control and diabetic mitochondria. In conclusion, the mitochondrial ETC is neither the target nor the site of ROS production in kidney tubule mitochondria in short-term diabetes. Mitochondrial fatty acid oxidation is the source of the increased net ROS production, and the site of electron leakage is located proximal to coenzyme Q at the electron transfer flavoprotein that shuttles electrons from acyl-CoA dehydrogenases to coenzyme Q.
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Affiliation(s)
- Mariana G Rosca
- Center of Mitochondrial Diseases, Case Western Reserve University, Cleveland, Ohio, USA.
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Harris SR, Zhang GF, Sadhukhan S, Murphy AM, Tomcik KA, Vazquez EJ, Anderson VE, Tochtrop GP, Brunengraber H. Metabolism of levulinate in perfused rat livers and live rats: conversion to the drug of abuse 4-hydroxypentanoate. J Biol Chem 2010; 286:5895-904. [PMID: 21126961 DOI: 10.1074/jbc.m110.196808] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Calcium levulinate (4-ketopentanoate) is used as an oral and parenteral source of calcium. We hypothesized that levulinate is converted in the liver to 4-hydroxypentanoate, a new drug of abuse, and that this conversion is accelerated by ethanol oxidation. We confirmed these hypotheses in live rats, perfused rat livers, and liver subcellular preparations. Levulinate is reduced to (R)-4-hydroxypentanoate by a cytosolic and a mitochondrial dehydrogenase, which are NADPH- and NADH-dependent, respectively. A mitochondrial dehydrogenase or racemase system also forms (S)-4-hydroxypentanoate. In livers perfused with [(13)C(5)]levulinate, there was substantial CoA trapping in levulinyl-CoA, 4-hydroxypentanoyl-CoA, and 4-phosphopentanoyl-CoA. This CoA trapping was increased by ethanol, with a 6-fold increase in the concentration of 4-phosphopentanoyl-CoA. Levulinate is catabolized by 3 parallel pathways to propionyl-CoA, acetyl-CoA, and lactate. Most intermediates of the 3 pathways were identified by mass isotopomer analysis and metabolomics. The production of 4-hydroxypentanoate from levulinate and its stimulation by ethanol is a potential public health concern.
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Affiliation(s)
- Stephanie R Harris
- Department of Nutrition, Case Western Reserve University, Cleveland, Ohio 44106, USA
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Lemieux H, Vazquez EJ, Fujioka H, Hoppel CL. Decrease in mitochondrial function in rat cardiac permeabilized fibers correlates with the aging phenotype. J Gerontol A Biol Sci Med Sci 2010; 65:1157-64. [PMID: 20801909 DOI: 10.1093/gerona/glq141] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
We measured the loss of cardiac mitochondrial function related to aging in males of three rat strains presenting with different longevity and aging phenotypes: the Fischer 344 (F344), the Brown Norway (BN), and the hybrid F344×BN. The F344 rat has a short life span and a ∼45% decrease in coupled mitochondrial oxidation in the cardiac permeabilized fibers from the old rats compared with the young rats. Citrate synthase activity in the permeabilized fibers (mitochondrial content) did not change significantly with aging. The BN live longer compared with the F344 and have a 15%-18% loss of mitochondrial respiration in the aged rats compared with the young rats. The differences are not significant. In hybrids, more resistant to aging than are the BN and the F344, mitochondrial function is preserved during aging. The difference in longevity of the different strains is correlated with mitochondrial dysfunction in the heart, suggesting the importance of mitochondria in cardiac aging.
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Affiliation(s)
- Hélène Lemieux
- Center for Mitochondrial Disease, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA
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10
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Lemieux H, Rosca MG, Vazquez EJ, Kehres D, Gnaiger E, Hoppel CL. 133 Detection of mitochondrial defects in patients with mitochondrial diseases: A case study. Mitochondrion 2010. [DOI: 10.1016/j.mito.2009.12.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Lemieux H, Rosca MG, Vazquez EJ, Gnaiger E, Hoppel CL. 134 Permeabilized fibers or isolated mitochondria for the detection of oxidative phosphorylation defects in patients with mitochondrial diseases. Mitochondrion 2010. [DOI: 10.1016/j.mito.2009.12.125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Lemieux HL, Vazquez EJ, Hoppel CL. Decrease in oxidative phosphorylation with aging correlates with the aging phenotype. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.954.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hélène L Lemieux
- Department of Pharmacology and MedicineCase Western Reserve UniversityClevelandOH
| | - Edwin J Vazquez
- Department of Pharmacology and MedicineCase Western Reserve UniversityClevelandOH
| | - Charles L Hoppel
- Department of Pharmacology and MedicineCase Western Reserve UniversityClevelandOH
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Rosca MG, Vazquez EJ, Kerner J, Parland W, Chandler MP, Stanley W, Sabbah HN, Hoppel CL. Cardiac mitochondria in heart failure: decrease in respirasomes and oxidative phosphorylation. Cardiovasc Res 2008; 80:30-9. [PMID: 18710878 PMCID: PMC2533423 DOI: 10.1093/cvr/cvn184] [Citation(s) in RCA: 285] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Aims Mitochondrial dysfunction is a major factor in heart failure (HF). A pronounced variability of mitochondrial electron transport chain (ETC) defects is reported to occur in severe acquired cardiomyopathies without a consistent trend for depressed activity or expression. The aim of this study was to define the defect in the integrative function of cardiac mitochondria in coronary microembolization-induced HF. Methods and results Studies were performed in the canine coronary microembolization-induced HF model of moderate severity. Oxidative phosphorylation was assessed as the integrative function of mitochondria, using a comprehensive variety of substrates in order to investigate mitochondrial membrane transport, dehydrogenase activity and electron-transport coupled to ATP synthesis. The supramolecular organization of the mitochondrial ETC also was investigated by native gel electrophoresis. We found a dramatic decrease in ADP-stimulated respiration that was not relieved by an uncoupler. Moreover, the ADP/O ratio was normal, indicating no defect in the phosphorylation apparatus. The data point to a defect in oxidative phosphorylation within the ETC. However, the individual activities of ETC complexes were normal. The amount of the supercomplex consisting of complex I/complex III dimer/complex IV, the major form of respirasome considered essential for oxidative phosphorylation, was decreased. Conclusions We propose that the mitochondrial defect lies in the supermolecular assembly rather than in the individual components of the ETC.
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Affiliation(s)
- Mariana G Rosca
- Department of Medicine, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland 44106-4981, OH, USA
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Rennison JH, McElfresh TA, Okere IC, Vazquez EJ, Patel HV, Foster AB, Patel KK, Chen Q, Hoit BD, Tserng KY, Hassan MO, Hoppel CL, Chandler MP. High-fat diet postinfarction enhances mitochondrial function and does not exacerbate left ventricular dysfunction. Am J Physiol Heart Circ Physiol 2007; 292:H1498-506. [PMID: 17114240 DOI: 10.1152/ajpheart.01021.2006] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Lipid accumulation in nonadipose tissue due to enhanced circulating fatty acids may play a role in the pathophysiology of heart failure, obesity, and diabetes. Accumulation of myocardial lipids and related intermediates, e.g., ceramide, is associated with decreased contractile function, mitochondrial oxidative phosphorylation, and electron transport chain (ETC) complex activities. We tested the hypothesis that the progression of heart failure would be exacerbated by elevated myocardial lipids and an associated ceramide-induced inhibition of mitochondrial oxidative phosphorylation and ETC complex activities. Heart failure (HF) was induced by coronary artery ligation. Rats were then randomly assigned to either a normal (10% kcal from fat; HF, n = 8) or high saturated fat diet (60% kcal from saturated fat; HF + Sat, n = 7). Sham-operated animals (sham; n = 8) were fed a normal diet. Eight weeks postligation, left ventricular (LV) function was assessed by echocardiography and catheterization. Subsarcolemmal and interfibrillar mitochondria were isolated from the LV. Heart failure resulted in impaired LV contractile function [decreased percent fractional shortening and peak rate of LV pressure rise and fall (±dP/d t)] and remodeling (increased end-diastolic and end-systolic dimensions) in HF compared with sham. No further progression of LV dysfunction was evident in HF + Sat. Mitochondrial state 3 respiration was increased in HF + Sat compared with HF despite elevated myocardial ceramide. Activities of ETC complexes II and IV were elevated in HF + Sat compared with HF and sham. High saturated fat feeding following coronary artery ligation was associated with increased oxidative phosphorylation and ETC complex activities and did not adversely affect LV contractile function or remodeling, despite elevations in myocardial ceramide.
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Affiliation(s)
- Julie H Rennison
- Dept of Physiology and Biophysics, School of Medicine E558, Case Western Reserve Univ, Cleveland, OH 44106-4970, USA
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Rosca MG, Vazquez EJ, Kerner J, Stanley W, Recchia F, Hoppel CL. Pacing‐induced heart failure causes specific defects in the phosphorylation apparatus in skeletal muscle mitochondria. FASEB J 2007. [DOI: 10.1096/fasebj.21.6.a945-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | - William Stanley
- Physiology and BiophysicsCase Western Reserve University2085 Adelbert Str.ClevelandOH44106
| | - Fabio Recchia
- PhysiologyNew York Medical College, ValhallaValhallaNY10595
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Rosca MG, Vazquez EJ, Chen Q, Lee CA, Kern TS, Hoppel CL. Diabetes causes kidney cell‐specific mitochondrial phenotypes and increased generation of superoxide. FASEB J 2007. [DOI: 10.1096/fasebj.21.6.a841-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mariana G Rosca
- MedicineCase Western Reserve University2085 Adelbert Str.ClevelandOH44106
| | | | | | - Chieh Allen Lee
- EndocrinologyCase Western Reserve University2085 Adelbert StrClevelandOH44106
| | - Timothy S Kern
- EndocrinologyCase Western Reserve University2085 Adelbert StrClevelandOH44106
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Rennison JH, McElfresh TA, Okere IC, Vazquez EJ, Patel HV, Foster AB, Patel KK, Chen Q, Hoit BD, Hoppel CL, Chandler MP. Post Infarction High Saturated Fat Feeding Does Not Exacerbate LV Dysfunction but Enhances Mitochondrial Function. FASEB J 2006. [DOI: 10.1096/fasebj.20.4.a316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Julie Helene Rennison
- Physiology and BiophysicsCase Western Reserve University10900 Euclid AvenueClevelandOH44106
| | - Tracy A McElfresh
- Physiology and BiophysicsCase Western Reserve University10900 Euclid AvenueClevelandOH44106
| | - Isidore C Okere
- Physiology and BiophysicsCase Western Reserve University10900 Euclid AvenueClevelandOH44106
| | - Edwin J Vazquez
- Veteran Affairs Medical Center10701 East BoulevardClevelandOH44106
| | - Hiral V Patel
- Veteran Affairs Medical Center10701 East BoulevardClevelandOH44106
| | - Amy B Foster
- Veteran Affairs Medical Center10701 East BoulevardClevelandOH44106
| | - Kalpana K Patel
- Veteran Affairs Medical Center10701 East BoulevardClevelandOH44106
| | - Qun Chen
- Veteran Affairs Medical Center10701 East BoulevardClevelandOH44106
| | - Brian D Hoit
- CardiologyUniversity Hospitals11100 Euclid AvenueClevelandOH44106
| | - Charles L Hoppel
- Veteran Affairs Medical Center10701 East BoulevardClevelandOH44106
| | - Margaret P Chandler
- Physiology and BiophysicsCase Western Reserve University10900 Euclid AvenueClevelandOH44106
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Rosca MG, Vazquez EJ, Stanley W, Hoppel CL. Skeletal muscle mitochondrial dysfunction in pacing‐induced heart failure in dogs. FASEB J 2006. [DOI: 10.1096/fasebj.20.4.a801-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mariana G Rosca
- MedicineCase Western Reserve University10701 East BoulevardClevelandOhio44106
| | - Edwin J Vazquez
- MedicineCase Western Reserve University10701 East BoulevardClevelandOhio44106
| | - William Stanley
- Physiology and BiophysicsCase Western Reserve University10900 Euclide AvenueClevelandOhio44106
| | - Charles L Hoppel
- MedicineCase Western Reserve University10701 East BoulevardClevelandOhio44106
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Abstract
The mitochondrial respiratory chain is a major source of reactive oxygen species (ROS) under pathological conditions including myocardial ischemia and reperfusion. Limitation of electron transport by the inhibitor rotenone immediately before ischemia decreases the production of ROS in cardiac myocytes and reduces damage to mitochondria. We asked if ROS generation by intact mitochondria during the oxidation of complex I substrates (glutamate, pyruvate/malate) occurred from complex I or III. ROS production by mitochondria of Sprague-Dawley rat hearts and corresponding submitochondrial particles was studied. ROS were measured as H2O2 using the amplex red assay. In mitochondria oxidizing complex I substrates, rotenone inhibition did not increase H2O2. Oxidation of complex I or II substrates in the presence of antimycin A markedly increased H2O2. Rotenone prevented antimycin A-induced H2O2 production in mitochondria with complex I substrates but not with complex II substrates. Catalase scavenged H2O2. In contrast to intact mitochondria, blockade of complex I with rotenone markedly increased H2O2 production from submitochondrial particles oxidizing the complex I substrate NADH. ROS are produced from complex I by the NADH dehydrogenase located in the matrix side of the inner membrane and are dissipated in mitochondria by matrix antioxidant defense. However, in submitochondrial particles devoid of antioxidant defense ROS from complex I are available for detection. In mitochondria, complex III is the principal site for ROS generation during the oxidation of complex I substrates, and rotenone protects by limiting electron flow into complex III.
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Affiliation(s)
- Qun Chen
- Department of Medicine, Division of Cardiology, Case Western Reserve University, Cleveland, Ohio 44106, USA
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