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Yin X, Harmancey R, Frierson B, Wu JG, Moody MR, McPherson DD, Huang SL. Efficient Gene Editing for Heart Disease via ELIP-Based CRISPR Delivery System. Pharmaceutics 2024; 16:343. [PMID: 38543237 PMCID: PMC10974117 DOI: 10.3390/pharmaceutics16030343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 02/09/2024] [Accepted: 02/26/2024] [Indexed: 04/01/2024] Open
Abstract
Liposomes as carriers for CRISPR/Cas9 complexes represent an attractive approach for cardiovascular gene therapy. A critical barrier to this approach remains the efficient delivery of CRISPR-based genetic materials into cardiomyocytes. Echogenic liposomes (ELIP) containing a fluorescein isothiocyanate-labeled decoy oligodeoxynucleotide against nuclear factor kappa B (ELIP-NF-κB-FITC) were used both in vitro on mouse neonatal ventricular myocytes and in vivo on rat hearts to assess gene delivery efficacy with or without ultrasound. In vitro analysis was then repeated with ELIP containing Cas9-sg-IL1RL1 (interleukin 1 receptor-like 1) RNA to determine the efficiency of gene knockdown. ELIP-NF-κB-FITC without ultrasound showed limited gene delivery in vitro and in vivo, but ultrasound combined with ELIP notably improved penetration into heart cells and tissues. When ELIP was used to deliver Cas9-sg-IL1RL1 RNA, gene editing was successful and enhanced by ultrasound. This innovative approach shows promise for heart disease gene therapy using CRISPR technology.
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Affiliation(s)
- Xing Yin
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - Romain Harmancey
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - Brion Frierson
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - Jean G. Wu
- Department of Diagnostic Sciences, The University of Texas Health Science Center at Houston, Houston, TX 77054, USA;
| | - Melanie R. Moody
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - David D. McPherson
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - Shao-Ling Huang
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
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Ashraf S, Frazier OH, Carranza S, McPherson DD, Taegtmeyer H, Harmancey R. A Two-Step Transcriptome Analysis of the Human Heart Reveals Broad and Disease-Responsive Expression of Ectopic Olfactory Receptors. Int J Mol Sci 2023; 24:13709. [PMID: 37762009 PMCID: PMC10530704 DOI: 10.3390/ijms241813709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 08/31/2023] [Accepted: 08/31/2023] [Indexed: 09/29/2023] Open
Abstract
G-protein-coupled receptors (GPCRs) are critical regulators of cardiac physiology and a key therapeutic target for the treatment of heart disease. Ectopic olfactory receptors (ORs) are GPCRs expressed in extra-nasal tissues which have recently emerged as new mediators in the metabolic control of cardiac function. The goals of this study were to profile OR gene expression in the human heart, to identify ORs dysregulated by heart failure caused by ischemic cardiomyopathy, and to provide evidence suggestive of a role for those altered ORs in the pathogenesis of heart failure. Left ventricular tissue from heart failure patients (n = 18) and non-failing heart samples (n = 4) were subjected to a two-step transcriptome analysis consisting of the quantification of 372 distinct OR transcripts on real-time PCR arrays and simultaneous determination of global cardiac gene expression by RNA sequencing. This strategy led to the identification of >160 ORs expressed in the human heart, including 38 receptors differentially regulated with heart failure. Co-expression analyses predicted the involvement of dysregulated ORs in the alteration of mitochondrial function, extracellular matrix remodeling, and inflammation. We provide this dataset as a resource for investigating roles of ORs in the human heart, with the hope that it will assist in the identification of new therapeutic targets for the treatment of heart failure.
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Affiliation(s)
- Sadia Ashraf
- Department of Internal Medicine, Division of Cardiology, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (S.A.)
| | - O. Howard Frazier
- Texas Heart Institute at Baylor St. Luke’s Medical Center, Houston, TX 77030, USA
| | - Sylvia Carranza
- Texas Heart Institute at Baylor St. Luke’s Medical Center, Houston, TX 77030, USA
| | - David D. McPherson
- Department of Internal Medicine, Division of Cardiology, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (S.A.)
| | - Heinrich Taegtmeyer
- Department of Internal Medicine, Division of Cardiology, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (S.A.)
| | - Romain Harmancey
- Department of Internal Medicine, Division of Cardiology, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (S.A.)
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3
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Yin X, Harmancey R, McPherson DD, Kim H, Huang SL. Liposome-Based Carriers for CRISPR Genome Editing. Int J Mol Sci 2023; 24:12844. [PMID: 37629024 PMCID: PMC10454197 DOI: 10.3390/ijms241612844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/04/2023] [Accepted: 08/14/2023] [Indexed: 08/27/2023] Open
Abstract
The CRISPR-based genome editing technology, known as clustered regularly interspaced short palindromic repeats (CRISPR), has sparked renewed interest in gene therapy. This interest is accompanied by the development of single-guide RNAs (sgRNAs), which enable the introduction of desired genetic modifications at the targeted site when used alongside the CRISPR components. However, the efficient delivery of CRISPR/Cas remains a challenge. Successful gene editing relies on the development of a delivery strategy that can effectively deliver the CRISPR cargo to the target site. To overcome this obstacle, researchers have extensively explored non-viral, viral, and physical methods for targeted delivery of CRISPR/Cas9 and a guide RNA (gRNA) into cells and tissues. Among those methods, liposomes offer a promising approach to enhance the delivery of CRISPR/Cas and gRNA. Liposomes facilitate endosomal escape and leverage various stimuli such as light, pH, ultrasound, and environmental cues to provide both spatial and temporal control of cargo release. Thus, the combination of the CRISPR-based system with liposome delivery technology enables precise and efficient genetic modifications in cells and tissues. This approach has numerous applications in basic research, biotechnology, and therapeutic interventions. For instance, it can be employed to correct genetic mutations associated with inherited diseases and other disorders or to modify immune cells to enhance their disease-fighting capabilities. In summary, liposome-based CRISPR genome editing provides a valuable tool for achieving precise and efficient genetic modifications. This review discusses future directions and opportunities to further advance this rapidly evolving field.
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Affiliation(s)
- Xing Yin
- Division of Cardiovascular Medicine, Department of Internal Medicine, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Romain Harmancey
- Division of Cardiovascular Medicine, Department of Internal Medicine, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - David D. McPherson
- Division of Cardiovascular Medicine, Department of Internal Medicine, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Hyunggun Kim
- Department of Biomechatronic Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Shao-Ling Huang
- Division of Cardiovascular Medicine, Department of Internal Medicine, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
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4
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Ashraf S, Taegtmeyer H, Harmancey R. Abstract P2032: Cardiac Nuclear Receptor Subfamily 4 Group A Member 2 Activates Cell Cycle Progression And Induces Heart Failure. Circ Res 2022. [DOI: 10.1161/res.131.suppl_1.p2032] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Transcription factors play a fundamental role in cardiovascular adaptation to stress. Nuclear receptor subfamily 4 group A member 2 (NR4A2; NURR1) is an immediate-early gene and transcription factor with a versatile role throughout many organs. In the adult mammalian heart and particularly in cardiac myocytes, NR4A2 is strongly up-regulated in response to beta-adrenergic stimulation. The physiological implications of this increase remain unknown. In this study, we aimed to interrogate the consequences of cardiac NR4A2 up-regulation under normal conditions and in response to pressure overload. In mice, tamoxifen-dependent, cardiomyocyte-restricted overexpression of NR4A2 led to left ventricular hypertrophy and dilation, heart failure, and death within 40 days. Chronic NR4A2 induction also precipitated cardiac decompensation during transverse aortic constriction (TAC)-induced pressure overload. Mechanistically, NR4A2 caused adult cardiac myocytes to return to a fetal-like phenotype, with a switch to glycolytic metabolism and disassembly of sarcomeric structures. NR4A2 also re-activated cell cycle progression and stimulated DNA replication and karyokinesis but failed to induce cytokinesis, thereby promoting polyploidization and multinucleation of cardiac myocytes. Activation of cell cycle checkpoints led to induction of an apoptotic response which ultimately resulted in excessive loss of cardiac myocytes and impaired left ventricular contractile function. In summary, myocyte-specific overexpression of NR4A2 in the postnatal mammalian heart results in increased cell cycle re-entry and DNA replication but does not result in cardiac myocyte division. Our findings expose a novel function for the nuclear receptor as a critical regulator in the self-renewal of the cardiac myocyte and heart regeneration.
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Affiliation(s)
- Sadia Ashraf
- The Univ of Texas Health Science Cntr at Houston, Houston, TX
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Ashraf S, Taegtmeyer H, Harmancey R. Prolonged cardiac NR4A2 activation causes dilated cardiomyopathy in mice. Basic Res Cardiol 2022; 117:33. [PMID: 35776225 PMCID: PMC9249728 DOI: 10.1007/s00395-022-00942-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 06/14/2022] [Accepted: 06/23/2022] [Indexed: 02/03/2023]
Abstract
Transcription factors play a fundamental role in cardiovascular adaptation to stress. Nuclear receptor subfamily 4 group A member 2 (NR4A2; NURR1) is an immediate-early gene and transcription factor with a versatile role throughout many organs. In the adult mammalian heart, and particularly in cardiac myocytes, NR4A2 is strongly up-regulated in response to beta-adrenergic stimulation. The physiologic implications of this increase remain unknown. In this study, we aimed to interrogate the consequences of cardiac NR4A2 up-regulation under normal conditions and in response to pressure overload. In mice, tamoxifen-dependent, cardiomyocyte-restricted overexpression of NR4A2 led to cardiomyocyte hypertrophy, left ventricular dilation, heart failure, and death within 40 days. Chronic NR4A2 induction also precipitated cardiac decompensation during transverse aortic constriction (TAC)-induced pressure overload. Mechanistically, NR4A2 caused adult cardiac myocytes to return to a fetal-like phenotype, with a switch to glycolytic metabolism and disassembly of sarcomeric structures. NR4A2 also re-activated cell cycle progression and stimulated DNA replication and karyokinesis but failed to induce cytokinesis, thereby promoting multinucleation of cardiac myocytes. Activation of cell cycle checkpoints led to induction of an apoptotic response which ultimately resulted in excessive loss of cardiac myocytes and impaired left ventricular contractile function. In summary, myocyte-specific overexpression of NR4A2 in the postnatal mammalian heart results in increased cell cycle re-entry and DNA replication but does not result in cardiac myocyte division. Our findings expose a novel function for the nuclear receptor as a critical regulator in the self-renewal of the cardiac myocyte and heart regeneration.
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Affiliation(s)
- Sadia Ashraf
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX, 77030, USA
| | - Heinrich Taegtmeyer
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX, 77030, USA
| | - Romain Harmancey
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX, 77030, USA.
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Heather LC, Hafstad AD, Halade GV, Harmancey R, Mellor KM, Mishra PK, Mulvihill EE, Nabben M, Nakamura M, Rider OJ, Ruiz M, Wende AR, Ussher JR. Guidelines on Models of Diabetic Heart Disease. Am J Physiol Heart Circ Physiol 2022; 323:H176-H200. [PMID: 35657616 PMCID: PMC9273269 DOI: 10.1152/ajpheart.00058.2022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Diabetes is a major risk factor for cardiovascular diseases, including diabetic cardiomyopathy, atherosclerosis, myocardial infarction, and heart failure. As cardiovascular disease represents the number one cause of death in people with diabetes, there has been a major emphasis on understanding the mechanisms by which diabetes promotes cardiovascular disease, and how antidiabetic therapies impact diabetic heart disease. With a wide array of models to study diabetes (both type 1 and type 2), the field has made major progress in answering these questions. However, each model has its own inherent limitations. Therefore, the purpose of this guidelines document is to provide the field with information on which aspects of cardiovascular disease in the human diabetic population are most accurately reproduced by the available models. This review aims to emphasize the advantages and disadvantages of each model, and to highlight the practical challenges and technical considerations involved. We will review the preclinical animal models of diabetes (based on their method of induction), appraise models of diabetes-related atherosclerosis and heart failure, and discuss in vitro models of diabetic heart disease. These guidelines will allow researchers to select the appropriate model of diabetic heart disease, depending on the specific research question being addressed.
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Affiliation(s)
- Lisa C Heather
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
| | - Anne D Hafstad
- Department of Medical Biology, Faculty of Health Sciences, UiT-The Arctic University of Norway, Tromsø, Norway
| | - Ganesh V Halade
- Department of Medicine, The University of Alabama at Birmingham, Tampa, Florida, United States
| | - Romain Harmancey
- Department of Internal Medicine, Division of Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, United States
| | | | - Paras K Mishra
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE, United States
| | - Erin E Mulvihill
- University of Ottawa Heart Institute, Ottawa, ON, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada
| | - Miranda Nabben
- Departments of Genetics and Cell Biology, and Clinical Genetics, Maastricht University Medical Center, CARIM School of Cardiovascular Diseases, Maastricht, the Netherlands
| | - Michinari Nakamura
- Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, Rutgers New Jersey Medical School, Newark, NJ, United States
| | - Oliver J Rider
- University of Oxford Centre for Clinical Magnetic Resonance Research, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Matthieu Ruiz
- Montreal Heart Institute, Montreal, Quebec, Canada.,Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
| | - Adam R Wende
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - John R Ussher
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada.,Alberta Diabetes Institute, University of Alberta, Edmonton, Alberta, Canada.,Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
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7
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Chen X, Ashraf S, Ashraf N, Harmancey R. UCP3 (Uncoupling Protein 3) Insufficiency Exacerbates Left Ventricular Diastolic Dysfunction During Angiotensin II-Induced Hypertension. J Am Heart Assoc 2021; 10:e022556. [PMID: 34533037 PMCID: PMC8649532 DOI: 10.1161/jaha.121.022556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background Left ventricular diastolic dysfunction, an early stage in the pathogenesis of heart failure with preserved ejection fraction, is exacerbated by joint exposure to hypertension and obesity; however, the molecular mechanisms involved remain uncertain. The mitochondrial UCP3 (uncoupling protein 3) is downregulated in the heart with obesity. Here, we used a rat model of UCP3 haploinsufficiency (ucp3+/‐) to test the hypothesis that decreased UCP3 promotes left ventricular diastolic dysfunction during hypertension. Methods and Results Ucp3+/‐ rats and ucp3+/+ littermates fed a high‐salt diet (HS; 2% NaCl) and treated with angiotensin II (190 ng/kg per min for 28 days) experienced a similar rise in blood pressure (158±4 versus 155±7 mm Hg). However, UCP3 insufficiency worsened diastolic dysfunction according to echocardiographic assessment of left ventricular filling pressures (E/e’; 18.8±1.0 versus 14.9±0.6; P<0.05) and the isovolumic relaxation time (24.7±0.6 versus 21.3±0.5 ms; P<0.05), as well as invasive monitoring of the diastolic time constant (Tau; 15.5±0.8 versus 12.7±0.2 ms; P<0.05). Exercise tolerance on a treadmill also decreased for HS/angiotensin II‐treated ucp3+/‐ rats. Histological and molecular analyses further revealed that UCP3 insufficiency accelerated left ventricular concentric remodeling, detrimental interstitial matrix remodeling, and fetal gene reprogramming during hypertension. Moreover, UCP3 insufficiency increased oxidative stress and led to greater impairment of protein kinase G signaling. Conclusions Our findings identified UCP3 insufficiency as a cause for increased incidence of left ventricular diastolic dysfunction during hypertension. The results add further support to the use of antioxidants targeting mitochondrial reactive oxygen species as an adjuvant therapy for preventing heart failure with preserved ejection fraction in individuals with obesity.
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Affiliation(s)
- Xu Chen
- Department of Physiology and Biophysics University of Mississippi Medical Center Jackson MS.,Mississippi Center for Obesity Research University of Mississippi Medical Center Jackson MS
| | - Sadia Ashraf
- Department of Physiology and Biophysics University of Mississippi Medical Center Jackson MS.,Mississippi Center for Obesity Research University of Mississippi Medical Center Jackson MS
| | | | - Romain Harmancey
- Department of Physiology and Biophysics University of Mississippi Medical Center Jackson MS.,Mississippi Center for Obesity Research University of Mississippi Medical Center Jackson MS
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8
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Ashraf S, Ashraf N, Yilmaz G, Harmancey R. Crosstalk between beta-adrenergic and insulin signaling mediates mechanistic target of rapamycin hyperactivation in liver of high-fat diet-fed male mice. Physiol Rep 2021; 9:e14958. [PMID: 34231324 PMCID: PMC8261682 DOI: 10.14814/phy2.14958] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 04/23/2021] [Revised: 06/17/2021] [Accepted: 06/17/2021] [Indexed: 11/24/2022] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver disease. While increased nutrient intake and sympathetic activity have been associated with the disease, the pathogenesis of NAFLD remains incompletely understood. We investigated the impact of the interaction of high dietary fat and sugar intake with increased beta-adrenergic receptor (β-AR) signaling on the activity of nutrient-sensing pathways and fuel storage in the liver. C57BL/6J mice were fed a standard rodent diet (STD), a high-fat diet (HFD), a high-fat/high-sugar Western diet (WD), a high-sugar diet with mixed carbohydrates (HCD), or a high-sucrose diet (HSD). After 6 week on diets, mice were treated with isoproterenol (ISO) and the activity of liver mTOR complex 1 (mTORC1)-related signaling analyzed by immunoblotting and correlated with tissue triglyceride and glycogen contents. ISO-stimulated AKT- and ERK-mediated activation of mTORC1 in STD-fed mice. Consumption of all four high-calorie diets exacerbated downstream activation of ribosomal protein S6 kinase beta-1 (S6K1) in response to ISO. S6K1 activity was greater with the fat-enriched HFD and WD and correlated with the presence of metabolic syndrome and a stronger activation of AKT and ERK1/2 pathways. Fat-enriched diets also increased triglyceride accumulation and inhibited glycogen mobilization under β-AR stimulation. In conclusion, crosstalk between β-AR and insulin signaling may contribute to HFD-induced hepatic steatosis through ERK1/2- and AKT-mediated hyperactivation of the mTORC1/S6K1 axis. The findings provide further rationale for the development of therapies aimed at targeting augmented β-AR signaling in the pathogenesis of NAFLD.
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Affiliation(s)
- Sadia Ashraf
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMSUSA
- Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMSUSA
| | | | - Gizem Yilmaz
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMSUSA
- Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMSUSA
| | - Romain Harmancey
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMSUSA
- Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMSUSA
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9
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Gava FN, da Silva AA, Dai X, Harmancey R, Ashraf S, Omoto ACM, Salgado MC, Moak SP, Li X, Hall JE, do Carmo JM. Restoration of Cardiac Function After Myocardial Infarction by Long-Term Activation of the CNS Leptin-Melanocortin System. JACC Basic Transl Sci 2021; 6:55-70. [PMID: 33532666 PMCID: PMC7838051 DOI: 10.1016/j.jacbts.2020.11.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 11/12/2020] [Accepted: 11/12/2020] [Indexed: 12/17/2022]
Abstract
Leptin protects against progression to heart failure after myocardial infarction. This beneficial effect requires activation of the brain melanocortin system. Stimulation of brain MC4R recapitulates the cardiac protective effects of leptin. Leptin-MC4R activation improves cardiac substrate oxidation and mitochondrial function. It also improves Ca2+ coupling and contractile function in viable cardiomyocytes after MI.
Heart failure has a high mortality rate, and current therapies offer limited benefits. The authors demonstrate that activation of the central nervous system leptin-melanocortin pathway confers remarkable protection against progressive heart failure following severe myocardial infarction. The beneficial cardiac-protective actions of leptin require activation of brain melanocortin-4 receptors and elicit improvements in cardiac substrate oxidation, cardiomyocyte contractility, Ca2+ coupling, and mitochondrial efficiency. These findings highlight a potentially novel therapeutic approach for myocardial infarction and heart failure.
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Key Words
- AMPK, adenosine monophosphate–activated protein kinase
- BP, blood pressure
- CNS, central nervous system
- HF, heart failure
- HR, heart rate
- ICV, intracerebroventricular
- LV, left ventricular
- MC4R
- MC4R, melanocortin-4 receptor
- MI, myocardial infarction
- MTII, melanotan II
- appetite
- blood pressure
- cardiac metabolism
- heart failure
- mTOR, mechanistic target of rapamycin
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Affiliation(s)
- Fabio N Gava
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA.,Department of Veterinary Clinics, Londrina State University, Parana, Brazil
| | - Alexandre A da Silva
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Xuemei Dai
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Romain Harmancey
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Sadia Ashraf
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Ana C M Omoto
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA.,Department of Physiology, University of Sao Paulo, Ribeirao Preto, Sao Paulo, Brazil
| | - Mateus C Salgado
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA.,Centro Universitário Barão de Mauá, Ribeirão Preto, São Paulo, Brazil
| | - Sydney P Moak
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Xuan Li
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - John E Hall
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Jussara M do Carmo
- Department of Physiology and Biophysics and Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
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10
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Lomax TM, Ashraf S, Yilmaz G, Harmancey R. Loss of Uncoupling Protein 3 Attenuates Western Diet-Induced Obesity, Systemic Inflammation, and Insulin Resistance in Rats. Obesity (Silver Spring) 2020; 28:1687-1697. [PMID: 32716607 PMCID: PMC7483834 DOI: 10.1002/oby.22879] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 04/09/2020] [Accepted: 04/29/2020] [Indexed: 12/29/2022]
Abstract
OBJECTIVE Uncoupling protein 3 (UCP3) is a mitochondrial carrier related to fatty acid metabolism. Although gene variants of UCP3 are associated with human obesity, their contribution to increased adiposity remains unclear. This study investigated the impact that loss of UCP3 has on diet-induced obesity in rats. METHODS Male UCP3 knockout rats (ucp3-/- ) and wild-type littermates (ucp3+/+ ) were fed a high-fat, high-carbohydrate Western diet for 21 weeks. Body composition was analyzed by EchoMRI. Whole-body insulin sensitivity and rates of tissue glucose uptake were determined by using hyperinsulinemic-euglycemic clamp. Changes in tissue physiology were interrogated by microscopy and RNA sequencing. RESULTS Loss of UCP3 decreased fat mass gain, white adipocytes size, and systemic inflammation. The ucp3-/- rats also exhibited preserved insulin sensitivity and increased glucose uptake in interscapular brown adipose tissue (iBAT). Brown adipocytes from ucp3-/- rats were protected from cellular degeneration caused by lipid accumulation and from reactive oxygen species-induced protein sulfonation. Increased glutathione levels in iBAT from ucp3-/- rats were linked to upregulation of genes encoding enzymes from the transsulfuration pathway in that tissue. CONCLUSIONS Loss of UCP3 partially protects rats from diet-induced obesity. This phenotype is related to induction of a compensatory antioxidant mechanism and prevention of iBAT whitening.
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Affiliation(s)
- Tyler M. Lomax
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS, USA
- Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA
- Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Sadia Ashraf
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS, USA
- Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA
- Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Gizem Yilmaz
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS, USA
- Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA
- Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
| | - Romain Harmancey
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS, USA
- Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA
- Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA
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11
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Ashraf S, Yilmaz G, Chen X, Harmancey R. Dietary Fat and Sugar Differentially Affect β-Adrenergic Stimulation of Cardiac ERK and AKT Pathways in C57BL/6 Male Mice Subjected to High-Calorie Feeding. J Nutr 2020; 150:1041-1050. [PMID: 31950177 PMCID: PMC7198302 DOI: 10.1093/jn/nxz342] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 10/16/2019] [Accepted: 12/23/2019] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND High dietary fat and sugar promote cardiac hypertrophy independently from an increase in blood pressure. The respective contribution that each macronutrient exerts on cardiac growth signaling pathways remains unclear. OBJECTIVE The goal of this study was to investigate the mechanisms by which high amounts of dietary fat and sugar affect cardiac growth regulatory pathways. METHODS Male C57BL/6 mice (9 wk old; n = 20/group) were fed a standard rodent diet (STD; kcal% protein-fat-carbohydrate, 29-17-54), a high-fat diet (HFD; 20-60-20), a high-fat and high-sugar Western diet (WD; 20-45-35), a high-sugar diet with mixed carbohydrates (HCD; 20-10-70), or a high-sucrose diet (HSD; 20-10-70). Body composition was assessed weekly by EchoMRI. Whole-body glucose utilization was assessed with an intraperitoneal glucose tolerance test. After 6 wk on diets, mice were treated with saline or 20 mg/kg isoproterenol (ISO), and the activity of cardiac growth regulatory pathways was analyzed by immunoblotting. Data were analyzed by ANOVA with data from the STD group included for references only. RESULTS Compared with HCD and HSD, WD and HFD increased body fat mass 2.7- to 3.8-fold (P < 0.001), induced glucose intolerance (P < 0.001), and increased insulin concentrations >1.5-fold (P < 0.05), thereby enhancing basal and ISO-stimulated AKT phosphorylation at both threonine 308 and serine 473 residues (+25-63%; P < 0.05). Compared with HFD, the high-sugar diets potentiated ISO-mediated stimulation of the glucose-sensitive kinases PYK2 (>47%; P < 0.05 for HCD and HSD) and ERK (>34%; P < 0.05 for WD, HCD, and HSD), thereby leading to increased phosphorylation of protein synthesis regulator S6K1 at threonine 389 residue (>64%; P < 0.05 for WD, HCD, and HSD). CONCLUSIONS Dietary fat and sugar affect cardiac growth signaling pathways in C57BL/6 mice through distinct and additive mechanisms. The findings may provide new insights into the role of overnutrition in pathological cardiac remodeling.
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Affiliation(s)
- Sadia Ashraf
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS,Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS,Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS
| | - Gizem Yilmaz
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS,Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS,Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS
| | - Xu Chen
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS,Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS,Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS
| | - Romain Harmancey
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS,Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS,Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS,Address correspondence to RH (e-mail: )
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12
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Huffman AM, Syed M, Rezq S, Anderson CD, Smith SV, Harmancey R, Yanes Cardozo LL, Romero DG. MicroRNA‐21 Ablation Attenuates Acetaminophen‐Induced Hepatoxtoxicity in Male Mice. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.03494] [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)
| | | | - Samar Rezq
- University of Mississippi Medical Center
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13
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Ashraf S, Yilmaz G, Chen X, Harmancey R. Dietary Fat and Sugar Differentially Affect Beta‐Adrenergic Stimulation of Cardiac ERK and AKT Pathways in Mice Subjected to High‐Calorie Feeding. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.04438] [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)
| | | | - Xu Chen
- University of Mississippi Medical Center
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14
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Lomax T, Ashraf S, Yilmaz G, Harmancey R. Lack of Uncoupling Protein 3 Protects from High‐Fat Diet‐Induced Obesity, Systemic Inflammation and Insulin Resistance in Rats. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.04465] [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]
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15
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Ashraf S, Hegazy YK, Harmancey R. Nuclear receptor subfamily 4 group A member 2 inhibits activation of ERK signaling and cell growth in response to β-adrenergic stimulation in adult rat cardiomyocytes. Am J Physiol Cell Physiol 2019; 317:C513-C524. [PMID: 31188636 PMCID: PMC6766613 DOI: 10.1152/ajpcell.00526.2018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Sustained elevation of sympathetic activity is an important contributor to pathological cardiac hypertrophy, ventricular arrhythmias, and left ventricular contractile dysfunction in chronic heart failure. The orphan nuclear receptor NR4A2 is an immediate early-response gene activated in the heart under β-adrenergic stimulation. The goal of this study was to identify the transcriptional remodeling events induced by increased NR4A2 expression in cardiomyocytes and their impact on the physiological response of those cells to sustained β-adrenergic stimulation. Treatment of adult rat ventricular myocytes with isoproterenol induced a rapid (<4 h) increase in NR4A2 levels that was accompanied by a transient (<24 h) increase in nuclear localization of the transcription factor. Adenovirus-mediated overexpression of NR4A2 to similar levels modulated the expression of genes linked to adrenoceptor signaling, calcium signaling, cell growth and proliferation and counteracted the increase in protein synthesis rate and cell surface area mediated by chronic isoproterenol stimulation. Consistent with those findings, NR4A2 overexpression also blocked the phosphorylative activation of growth-related kinases ERK1/2, Akt, and p70 S6 kinase. Prominent among the transcriptional changes induced by NR4A2 was the upregulation of the dual-specificity phosphatases DUSP2 and DUSP14, two known inhibitors of ERK1/2. Pretreatment of NR4A2-overexpressing cardiomyocytes with the DUSP inhibitor BCI [(E)-2-benzylidene-3-(cyclohexylamino)-2,3-dihydro-1H-inden-1-one] prevented the inhibition of ERK1/2 following isoproterenol stimulation. In conclusion, our results suggest that NR4A2 acts as a novel negative feedback regulator of the β-adrenergic receptor-mediated growth response in cardiomyocytes and this at least partly through DUSP-mediated inhibition of ERK1/2 signaling.
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Affiliation(s)
- Sadia Ashraf
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi.,Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, Mississippi.,Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, Mississippi
| | - Yassmin K Hegazy
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi.,Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, Mississippi.,Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, Mississippi
| | - Romain Harmancey
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi.,Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, Mississippi.,Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, Mississippi
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16
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Mahmoudi E, Lomax TM, Harmancey R. Uncoupling Protein 3 Deficiency Impairs Contractile Recovery in a Rat Model of Myocardial Infarction and Reperfusion. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.830.7] [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)
- Elena Mahmoudi
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Tyler M. Lomax
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Romain Harmancey
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity of Mississippi Medical CenterJacksonMS
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17
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Lomax TM, Ashraf S, Wiseman JM, Edwards KS, Harmancey R. Uncoupling Protein 3 Deficiency Prevents Whitening of Brown Fat and Preserves Insulin Sensitivity in High‐Fat Fed Rats. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.752.4] [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)
- Tyler M. Lomax
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity Of Mississippi Medical CenterJacksonMS
| | - Sadia Ashraf
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity Of Mississippi Medical CenterJacksonMS
| | - Jessica M. Wiseman
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity Of Mississippi Medical CenterJacksonMS
| | - Kristin S. Edwards
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity Of Mississippi Medical CenterJacksonMS
| | - Romain Harmancey
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity Of Mississippi Medical CenterJacksonMS
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18
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Gava FN, Silva AA, Ashraf S, Omoto AC, Dai X, Pullman M, Harmancey R, Hall JE, Carmo JM. Chronic Intracerebroventricular Leptin Infusion Attenuates Cardiac Dysfunction After Myocardial Infarction. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.830.6] [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)
- Fabio N. Gava
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Alexandre A. Silva
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Sadia Ashraf
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Ana C.M. Omoto
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
- Department of Physiology‐School of Medicine of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil
| | - Xuemei Dai
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Mallory Pullman
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Romain Harmancey
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - John E. Hall
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Jussara M. Carmo
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
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19
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Ashraf S, Hegazy Y, Harmancey R. NR4A2 Inhibits ERK‐Mediated Protein Synthesis and Cell Growth in Response to Beta‐Adrenergic Stimulation in Cardiomyocytes. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.719.15] [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)
- Sadia Ashraf
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Yassmin Hegazy
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Romain Harmancey
- Physiology and BiophysicsMississippi Center for Obesity Research, and Mississippi Center for Heart ResearchUniversity of Mississippi Medical CenterJacksonMS
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20
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Silva AA, Harmancey R, Dai X, Moak SP, Roy CN, Wang Z, Hall JE, Carmo JM. Differential Regulation of Cardiac Substrate Utilization in Response to Chronic Central Nervous System Administration of Leptin and Melanotan II in Rats with Myocardial Infarction. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.532.10] [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)
- Alexandre A. Silva
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Romain Harmancey
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Xuemei Dai
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Sydney P. Moak
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Cary N. Roy
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Zhen Wang
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - John E. Hall
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
| | - Jussara M. Carmo
- Physiology and Biophysics, and Mississippi Center for Obesity ResearchUniversity of Mississippi Medical CenterJacksonMS
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21
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Mouton AJ, DeLeon-Pennell KY, Rivera Gonzalez OJ, Flynn ER, Freeman TC, Saucerman JJ, Garrett MR, Ma Y, Harmancey R, Lindsey ML. Mapping macrophage polarization over the myocardial infarction time continuum. Basic Res Cardiol 2018; 113:26. [PMID: 29868933 PMCID: PMC5986831 DOI: 10.1007/s00395-018-0686-x] [Citation(s) in RCA: 170] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 05/29/2018] [Indexed: 12/24/2022]
Abstract
In response to myocardial infarction (MI), cardiac macrophages regulate inflammation and scar formation. We hypothesized that macrophages undergo polarization state changes over the MI time course and assessed macrophage polarization transcriptomic signatures over the first week of MI. C57BL/6 J male mice (3–6 months old) were subjected to permanent coronary artery ligation to induce MI, and macrophages were isolated from the infarct region at days 1, 3, and 7 post-MI. Day 0, no MI resident cardiac macrophages served as the negative MI control. Whole transcriptome analysis was performed using RNA-sequencing on n = 4 pooled sets for each time. Day 1 macrophages displayed a unique pro-inflammatory, extracellular matrix (ECM)-degrading signature. By flow cytometry, day 0 macrophages were largely F4/80highLy6Clow resident macrophages, whereas day 1 macrophages were largely F4/80lowLy6Chigh infiltrating monocytes. Day 3 macrophages exhibited increased proliferation and phagocytosis, and expression of genes related to mitochondrial function and oxidative phosphorylation, indicative of metabolic reprogramming. Day 7 macrophages displayed a pro-reparative signature enriched for genes involved in ECM remodeling and scar formation. By triple in situ hybridization, day 7 infarct macrophages in vivo expressed collagen I and periostin mRNA. Our results indicate macrophages show distinct gene expression profiles over the first week of MI, with metabolic reprogramming important for polarization. In addition to serving as indirect mediators of ECM remodeling, macrophages are a direct source of ECM components. Our study is the first to report the detailed changes in the macrophage transcriptome over the first week of MI.
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Affiliation(s)
- Alan J Mouton
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, 2500 North State St., Jackson, MS, 39216-4505, USA
| | - Kristine Y DeLeon-Pennell
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, 2500 North State St., Jackson, MS, 39216-4505, USA.,Research Service, G.V. (Sonny) Montgomery Veterans Affairs Medical Center, Jackson, MS, 39216, USA
| | - Osvaldo J Rivera Gonzalez
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, 2500 North State St., Jackson, MS, 39216-4505, USA
| | - Elizabeth R Flynn
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, 2500 North State St., Jackson, MS, 39216-4505, USA
| | - Tom C Freeman
- The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, Scotland, UK
| | - Jeffrey J Saucerman
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA
| | - Michael R Garrett
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, MS, 39216, USA
| | - Yonggang Ma
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, 2500 North State St., Jackson, MS, 39216-4505, USA
| | - Romain Harmancey
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, 2500 North State St., Jackson, MS, 39216-4505, USA
| | - Merry L Lindsey
- Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, 2500 North State St., Jackson, MS, 39216-4505, USA. .,Research Service, G.V. (Sonny) Montgomery Veterans Affairs Medical Center, Jackson, MS, 39216, USA.
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22
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Ashraf S, Harmancey R. The Nuclear Receptor NR4A2 Coordinates Transcriptional Remodeling of Metabolic, Calcium, and Growth Signaling Networks in Adult Rat Ventricular Myocytes. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.848.7] [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)
- Sadia Ashraf
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
| | - Romain Harmancey
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
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23
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Lomax TM, Wiseman JM, Edwards KS, Ashraf S, Harmancey R. Lack of Uncoupling Protein 3 Protects from High‐Fat Diet‐Induced Insulin Resistance and Glucose Intolerance in Rats. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.879.3] [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)
- Tyler M. Lomax
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
| | - Jessica M. Wiseman
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
| | - Kristin S. Edwards
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
| | - Sadia Ashraf
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
| | - Romain Harmancey
- Department of Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
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24
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Bux AS, Lindsey ML, Vasquez HG, Taegtmeyer H, Harmancey R. Glucose regulates the intrinsic inflammatory response of the heart to surgically induced hypothermic ischemic arrest and reperfusion. Physiol Genomics 2016; 49:37-52. [PMID: 27940566 DOI: 10.1152/physiolgenomics.00102.2016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Revised: 11/28/2016] [Accepted: 12/06/2016] [Indexed: 12/15/2022] Open
Abstract
We investigated the isolated working rat heart as a model to study early transcriptional remodeling induced in the setting of open heart surgery and stress hyperglycemia. Hearts of male Sprague Dawley rats were cold-arrested in Krebs-Henseleit buffer and subjected to 60 min normothermic reperfusion in the working mode with buffer supplemented with noncarbohydrate substrates plus glucose (25 mM) or mannitol (25 mM; osmotic control). Gene expression profiles were determined by microarray analysis and compared with those of nonperfused hearts. Perfused hearts displayed a transcriptional signature independent from the presence of glucose showing a more than twofold increase in expression of 71 genes connected to inflammation, cell proliferation, and apoptosis. These transcriptional alterations were very similar to the ones taking place in the hearts of open heart surgery patients. Prominent among those alterations was the upregulation of the three master regulators of metabolic reprogramming, MYC, NR4A1, and NR4A2. Targeted pathway analysis revealed an upregulation of metabolic processes associated with the proliferation and activation of macrophages and fibroblasts. Glucose potentiated the upregulation of a subset of genes associated with polarization of tissue reparative M2-like macrophages, an effect that was lost in perfused hearts from rats rendered insulin resistant by high-sucrose feeding. The results expose the heart as a significant source of proinflammatory mediators released in response to stress associated with cardiac surgery with cardiopulmonary bypass, and suggest a major role for glucose as a signal in the determination of resident cardiac macrophage polarization.
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Affiliation(s)
- Ahmed S Bux
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, and Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, Mississippi; and
| | - Merry L Lindsey
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, and Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, Mississippi; and
| | - Hernan G Vasquez
- Department of Internal Medicine, Division of Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, Texas
| | - Heinrich Taegtmeyer
- Department of Internal Medicine, Division of Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, Texas
| | - Romain Harmancey
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, and Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, Mississippi; and
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25
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Altara R, Harmancey R, Didion SP, Booz GW, Zouein FA. Cardiac STAT3 Deficiency Impairs Contractility and Metabolic Homeostasis in Hypertension. Front Pharmacol 2016; 7:436. [PMID: 27899891 PMCID: PMC5110511 DOI: 10.3389/fphar.2016.00436] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 11/01/2016] [Indexed: 12/22/2022] Open
Abstract
Signal transducer and activator of transcription 3 (STAT3) protects the heart from acute ischemic stress. However, the importance of STAT3 to the heart in chronic stress, such as hypertension, is not known. To study this, we used cardiomyocyte-targeted STAT3 knockout (KO) mice and Angiotensin II (ANG II) infusion by osmotic minipumps. After 4 weeks, ANG II induced similar cardiac hypertrophy in wild type (WT) and cardiac Cre-expressing control (CTRL) mice with no impairment of cardiac function. In contrast, STAT3 KO mice exhibited reduced contractile function but similar hypertrophy to CTRL mice. Ejection fraction and fractional shortening decreased by 22.5 and 27.3%, respectively. Since STAT3 has direct protective effects on mitochondrial function, we examined rates of glucose and oleate oxidation by isolated perfused hearts using a Langendorff system. Hearts of ANG II-treated STAT3 KO and CTRL mice had similar rates of oleate oxidation as saline-infused WT mice. Rates of glucose oxidation were similar between hearts of WT plus saline and CTRL plus ANG II mice; however, glucose oxidation was increased by 66% in hearts of ANG II-treated STAT3 KO mice. The ratio of maximal ATP yield from glucose to fatty acid oxidation was 21.1 ± 3.1 in hearts of ANG II-treated STAT3 KO mice vs. 12.6 ± 2.2 in hearts of ANG II-treated CTRL mice. Lactate production was also elevated in hearts of ANG II-treated STAT3 KO mice by 162% compared to ANG II-treated CTRL mice. Our findings indicate that STAT3 is important for maintaining contractile function and metabolic homeostasis in the hypertensive heart, and STAT3 deficiency promotes a switch toward glucose utilization.
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Affiliation(s)
- Raffaele Altara
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson MS, USA
| | - Romain Harmancey
- Department of Physiology and Biophysics, School of Medicine, University of Mississippi Medical Center, Jackson MS, USA
| | - Sean P Didion
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson MS, USA
| | - George W Booz
- Department of Pharmacology and Toxicology, School of Medicine, University of Mississippi Medical Center, Jackson MS, USA
| | - Fouad A Zouein
- Department of Pharmacology and Toxicology, Faculty of Medicine, American University of Beirut Beirut, Lebanon
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26
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Evaristi MF, Caubère C, Harmancey R, Desmoulin F, Peacock WF, Berry M, Turkieh A, Barutaut M, Galinier M, Dambrin C, Polidori C, Miceli C, Chamontin B, Koukoui F, Roncalli J, Massabuau P, Smih F, Rouet P. Increased mean aliphatic lipid chain length in left ventricular hypertrophy secondary to arterial hypertension: A cross-sectional study. Medicine (Baltimore) 2016; 95:e4965. [PMID: 27861330 PMCID: PMC5120887 DOI: 10.1097/md.0000000000004965] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
About 77.9 million (1 in 4) American adults have high blood pressure. High blood pressure is the primary cause of left ventricular hypertrophy (LVH), which represents a strong predictor of future heart failure and cardiovascular mortality. Previous studies have shown an altered metabolic profile in hypertensive patients with LVH. The goal of this study was to identify blood metabolomic LVH biomarkers by H NMR to provide novel diagnostic tools for rapid LVH detection in populations of hypertensive individuals. This cross-sectional study included 48 hypertensive patients with LVH matched with 48 hypertensive patients with normal LV size, and 24 healthy controls. Two-dimensional targeted M-mode echocardiography was performed to measure left ventricular mass index. Partial least squares discriminant analysis was used for the multivariate analysis of the H NMR spectral data. From the H NMR-based metabolomic profiling, signals coming from methylene (-CH2-) and methyl (-CH3) moieties of aliphatic chains from plasma lipids were identified as discriminant variables. The -CH2-/-CH3 ratio, an indicator of the mean length of the aliphatic lipid chains, was significantly higher (P < 0.001) in the LVH group than in the hypertensive group without LVH and controls. Receiver operating characteristic curve showed that a cutoff of 2.34 provided a 52.08% sensitivity and 85.42% specificity for discriminating LVH (AUC = 0.703, P-value < 0.001). We propose the -CH2-/-CH3 ratio from plasma aliphatic lipid chains as a biomarker for the diagnosis of left ventricular remodeling in hypertension.
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Affiliation(s)
- Maria Francesca Evaristi
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
- University of Camerino, Camerino, Italy
| | - Céline Caubère
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
| | - Romain Harmancey
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS
| | - Franck Desmoulin
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
| | | | - Matthieu Berry
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
| | - Annie Turkieh
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
| | - Manon Barutaut
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
| | - Michel Galinier
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
- Toulouse University Hospital, Toulouse
| | - Camille Dambrin
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
- Toulouse University Hospital, Toulouse
| | | | | | | | - François Koukoui
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
| | | | - Pierre Massabuau
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
- Toulouse University Hospital, Toulouse
| | - Fatima Smih
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
- Spartacus-Biomed, Clermont le Fort, France
| | - Philippe Rouet
- UMR UT3 CNRS 5288 Evolutionary Medicine, Obesity and Heart Failure: Molecular and Clinical Investigations, INI-CRCT F-CRIN, GREAT Networks, Toulouse Cedex 4, France
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Bakrania B, Granger JP, Harmancey R. Methods for the Determination of Rates of Glucose and Fatty Acid Oxidation in the Isolated Working Rat Heart. J Vis Exp 2016. [PMID: 27768055 DOI: 10.3791/54497] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The mammalian heart is a major consumer of ATP and requires a constant supply of energy substrates for contraction. Not surprisingly, alterations of myocardial metabolism have been linked to the development of contractile dysfunction and heart failure. Therefore, unraveling the link between metabolism and contraction should shed light on some of the mechanisms governing cardiac adaptation or maladaptation in disease states. The isolated working rat heart preparation can be used to follow, simultaneously and in real time, cardiac contractile function and flux of energy providing substrates into oxidative metabolic pathways. The present protocol aims to provide a detailed description of the methods used in the preparation and utilization of buffers for the quantitative measurement of the rates of oxidation for glucose and fatty acids, the main energy providing substrates of the heart. The methods used for sample analysis and data interpretation are also discussed. In brief, the technique is based on the supply of 14C- radiolabeled glucose and a 3H- radiolabeled long-chain fatty acid to an ex vivo beating heart via normothermic crystalloid perfusion. 14CO2 and 3H2O, end byproducts of the enzymatic reactions involved in the utilization of these energy providing substrates, are then quantitatively recovered from the coronary effluent. With knowledge of the specific activity of the radiolabeled substrates used, it is then possible to individually quantitate the flux of glucose and fatty acid in the oxidation pathways. Contractile function of the isolated heart can be determined in parallel with the appropriate recording equipment and directly correlated to metabolic flux values. The technique is extremely useful to study the metabolism/contraction relationship in response to various stress conditions such as alterations in pre and after load and ischemia, a drug or a circulating factor, or following the alteration in the expression of a gene product.
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Affiliation(s)
- Bhavisha Bakrania
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center
| | - Joey P Granger
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center
| | - Romain Harmancey
- Department of Physiology and Biophysics, Mississippi Center for Obesity Research, Cardiovascular-Renal Research Center, University of Mississippi Medical Center;
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Lindsey ML, Hall ME, Harmancey R, Ma Y. Adapting extracellular matrix proteomics for clinical studies on cardiac remodeling post-myocardial infarction. Clin Proteomics 2016; 13:19. [PMID: 27651752 PMCID: PMC5024439 DOI: 10.1186/s12014-016-9120-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 07/15/2016] [Indexed: 01/16/2023] Open
Abstract
Following myocardial infarction (MI), the left ventricle (LV) undergoes a series of cardiac wound healing responses that involve stimulation of robust inflammation to clear necrotic myocytes and tissue debris and induction of extracellular matrix (ECM) protein synthesis to generate a scar. Proteomic strategies provide us with a means to index the ECM proteins expressed in the LV, quantify amounts, determine functions, and explore interactions. This review will focus on the efforts taken in the proteomics research field that have expanded our understanding of post-MI LV remodeling, concentrating on the strengths and limitations of different proteomic approaches to glean information that is specific to ECM turnover in the post-MI setting. We will discuss how recent advances in sample preparation and labeling protocols increase our successes at detecting components of the cardiac ECM proteome. We will summarize how proteomic approaches, focusing on the ECM compartment, have progressed over time to current gel-free methods using decellularized fractions or labeling strategies that will be useful for clinical applications. This review will provide an overview of how cardiac ECM proteomics has evolved over the last decade and will provide insight into future directions that will drive forward our understanding of cardiac ECM turnover in the post-MI LV.
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Affiliation(s)
- Merry L Lindsey
- Mississippi Center for Heart Research, Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 North State St., Jackson, MS 39216-4505 USA ; Division of Cardiology, Department of Medicine, University of Mississippi Medical Center, Jackson, MS USA ; Research Service, G.V. (Sonny) Montgomery Veterans Affairs Medical Center, Jackson, MS USA
| | - Michael E Hall
- Mississippi Center for Heart Research, Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 North State St., Jackson, MS 39216-4505 USA ; Division of Cardiology, Department of Medicine, University of Mississippi Medical Center, Jackson, MS USA
| | - Romain Harmancey
- Mississippi Center for Heart Research, Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 North State St., Jackson, MS 39216-4505 USA
| | - Yonggang Ma
- Mississippi Center for Heart Research, Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 North State St., Jackson, MS 39216-4505 USA
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Lam T, Harmancey R, Vasquez H, Gilbert B, Patel N, Hariharan V, Lee A, Covey M, Taegtmeyer H. Reversal of intramyocellular lipid accumulation by lipophagy and a p62-mediated pathway. Cell Death Discov 2016; 2:16061. [PMID: 27625792 PMCID: PMC4993124 DOI: 10.1038/cddiscovery.2016.61] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 06/19/2016] [Indexed: 12/16/2022] Open
Abstract
We have previously observed the reversal of lipid droplet deposition in skeletal muscle of morbidly obese patients following bariatric surgery. We now investigated whether activation of autophagy is the mechanism underlying this observation. For this purpose, we incubated rat L6 myocytes over a period of 6 days with long-chain fatty acids (an equimolar, 1.0 mM, mixture of oleate and palmitate in the incubation medium). At day 6, the autophagic inhibitor (bafilomycin A1, 200 nM) and the autophagic activator (rapamycin, 1 μM) were added separately or in combination for 48 h. Intracellular triglyceride (TG) accumulation was visualized and quantified colorimetrically. Protein markers of autophagic flux (LC3 and p62) and cell death (caspase-3 cleavage) were measured by immunoblotting. Inhibition of autophagy by bafilomycin increased TG accumulation and also increased lipid-mediated cell death. Conversely, activation of autophagy by rapamycin reduced both intracellular lipid accumulation and cell death. Unexpectedly, treatment with both drugs added simultaneously resulted in decreased lipid accumulation. In this treatment group, immunoblotting revealed p62 degradation (autophagic flux), immunofluorescence revealed the colocalization of p62 with lipid droplets, and co-immunoprecipitation confirmed the interaction of p62 with ADRP (adipose differentiation-related protein), a lipid droplet membrane protein. Thus the association of p62 with lipid droplet turnover suggests a novel pathway for the breakdown of lipid droplets in muscle cells. In addition, treatment with rapamycin and bafilomycin together also suggested the export of TG into the extracellular space. We conclude that lipophagy promotes the clearance of lipids from myocytes and switches to an alternative, p62-mediated, lysosomal-independent pathway in the context of chronic lipid overload (*P<0.05, **P<0.01, ***P<0.001, ****P<0.0001).
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Affiliation(s)
- T Lam
- Internal Medicine/Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, TX, USA
| | - R Harmancey
- University of Mississippi School of Medicine , Jackson, MS, USA
| | - H Vasquez
- Internal Medicine/Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, TX, USA
| | - B Gilbert
- Internal Medicine/Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, TX, USA
| | - N Patel
- Internal Medicine/Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, TX, USA
| | | | - A Lee
- Keck School of Medicine of USC , Los Angeles, CA, USA
| | - M Covey
- Internal Medicine/Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, TX, USA
| | - H Taegtmeyer
- Internal Medicine/Cardiology, McGovern Medical School at The University of Texas Health Science Center at Houston, TX, USA
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Bux A, Vasquez H, Taegtmeyer H, Harmancey R. Abstract 467: Glucose Promotes M2-related Transcriptional Reprogramming of Resident Cardiac Macrophages in Response to Hypothermic Ischemic Arrest and Reperfusion. Circ Res 2016. [DOI: 10.1161/res.119.suppl_1.467] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Stress hyperglycemia and inflammation frequently develop in open heart surgery patients. Although both factors independently contribute to increased peri-operative morbidity and mortality, the impact of high glucose levels on cardiac inflammatory response remains unknown. We investigated the isolated working rat heart as a model to study cardiac early stress response to surgery. Hearts of male Sprague Dawley rats were cold-arrested and subjected to 60 minutes normothermic reperfusion in the working mode with Krebs-Henseleit buffer supplemented with ketone bodies and propionate plus glucose (25 mM) or mannitol (25 mM; osmotic control). Alterations of gene expression in the left ventricle were determined by microarray and real-time PCR analyses. Compared to non-perfused hearts, perfused hearts displayed a more than twofold increased expression for 71 genes (mannitol group) and 103 genes (glucose group) connected to inflammation, cell proliferation, and apoptosis. The transcriptional changes were highly similar to gene alterations previously reported in the right atrium (
P
< 2.34E-16) and left ventricle (
P
< 4.83E-46) of patients who underwent cardiac surgery with cardiopulmonary bypass. Pathway analysis with Reactome revealed an up-regulation of metabolic processes associated with the proliferation and activation of immune cells, including glycolysis, glutaminolysis, fatty acid synthesis, polyamine synthesis, and hexosamine synthesis. Although the transcriptional remodeling occurred independently from the presence of glucose, glucose significantly increased further the expression of several transcription factors and markers associated with M2 polarization of macrophages, including Myc (1.6-fold), Nr4a1 (1.3-fold), Nr4a2 (1.8-fold), Zc3h12a (1.3-fold), Fosl2 (1.4-fold), Cebpb (1.2-fold), and Arg1 (1.7-fold). Interestingly, glucose failed to enhance the expression of M2-related genes in the heart of rats rendered insulin resistant by high-sucrose feeding. Besides demonstrating that the isolated working rat heart accurately reproduces the stress response associated with open heart surgery, the results also suggest that glucose promotes the alternative activation of resident cardiac macrophages in the stressed heart.
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Affiliation(s)
- Ahmed Bux
- The Univ of Mississippi Med Cntr, Jackson, MS
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Harmancey R, Haight DL, Watts KA, Taegtmeyer H. Chronic Hyperinsulinemia Causes Selective Insulin Resistance and Down-regulates Uncoupling Protein 3 (UCP3) through the Activation of Sterol Regulatory Element-binding Protein (SREBP)-1 Transcription Factor in the Mouse Heart. J Biol Chem 2015; 290:30947-61. [PMID: 26555260 DOI: 10.1074/jbc.m115.673988] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2015] [Indexed: 01/22/2023] Open
Abstract
The risk for heart failure and death after myocardial infarction is abnormally high in diabetic subjects. We and others have shown previously that mitochondrial uncoupling protein 3 (UCP3) improves functional recovery of the rodent heart during reperfusion. Here, we demonstrate that pharmacological induction of hyperinsulinemia in mice down-regulates myocardial UCP3. Decreased UCP3 expression was linked to the development of selective insulin resistance in the heart, characterized by decreased basal activity of Akt but preserved activity of the p44/42 mitogen-activated protein kinase, and overactivation of the sterol regulatory element-binding protein (SREBP)-1-mediated lipogenic program. In cultured myocytes, insulin treatment and SREBP-1 overexpression decreased, whereas SREBP-1 interference increased, peroxisome proliferator-activated receptor-stimulated expression of UCP3. Promoter deletion and site-directed mutagenesis identified three functional sterol regulatory elements in the vicinity of a known complex intronic enhancer. Increased binding of SREBP-1 to this DNA region was confirmed in the heart of hyperinsulinemic mice. In conclusion, we describe a hitherto unknown regulatory mechanism by which insulin inhibits cardiac UCP3 expression through activation of the lipogenic factor SREBP-1. Sustained down-regulation of cardiac UCP3 by hyperinsulinemia may partly explain the poor prognosis of type 2 diabetic patients after myocardial infarction.
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Affiliation(s)
- Romain Harmancey
- From the Department of Internal Medicine, Division of Cardiology, University of Texas Medical School, University of Texas Health Science Center, Houston, Texas 77030 and the Department of Physiology and Biophysics, Mississippi Center for Obesity Research and Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi 39216-4505
| | - Derek L Haight
- From the Department of Internal Medicine, Division of Cardiology, University of Texas Medical School, University of Texas Health Science Center, Houston, Texas 77030 and
| | - Kayla A Watts
- the Department of Physiology and Biophysics, Mississippi Center for Obesity Research and Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi 39216-4505
| | - Heinrich Taegtmeyer
- From the Department of Internal Medicine, Division of Cardiology, University of Texas Medical School, University of Texas Health Science Center, Houston, Texas 77030 and
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Taegtmeyer H, Beauloye C, Harmancey R, Hue L. Comment on Nolan et al. Insulin Resistance as a Physiological Defense Against Metabolic Stress: Implications for the Management of Subsets of Type 2 Diabetes. Diabetes 2015;64:673-686. Diabetes 2015; 64:e37. [PMID: 26405279 PMCID: PMC7519471 DOI: 10.2337/db15-0655] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Heinrich Taegtmeyer
- Division of Cardiovascular Medicine, Department of Internal Medicine, The University of Texas Medical School at Houston, Houston, TX
| | - Christophe Beauloye
- Pôle de Recherche Cardiovasculaire, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium
| | - Romain Harmancey
- Department of Physiology and Biophysics, The University of Mississippi Medical Center, Jackson, MS
| | - Louis Hue
- Protein Phosphorylation Unit, de Duve Institute, Université catholique de Louvain, Brussels, Belgium
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Hall ME, Harmancey R, Stec DE. Lean heart: Role of leptin in cardiac hypertrophy and metabolism. World J Cardiol 2015; 7:511-524. [PMID: 26413228 PMCID: PMC4577678 DOI: 10.4330/wjc.v7.i9.511] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 06/16/2015] [Accepted: 07/23/2015] [Indexed: 02/06/2023] Open
Abstract
Leptin is an adipokine that has been linked with the cardiovascular complications resulting from obesity such as hypertension and heart disease. Obese patients have high levels of circulating leptin due to increased fat mass. Clinical and population studies have correlated high levels of circulating leptin with the development of cardiac hypertrophy in obesity. Leptin has also been demonstrated to increase the growth of cultured cardiomyocytes. However, several animal studies of obese leptin deficient mice have not supported a role for leptin in promoting cardiac hypertrophy so the role of leptin in this pathological process remains unclear. Leptin is also an important hormone in the regulation of cardiac metabolism where it supports oxidation of glucose and fatty acids. In addition, leptin plays a critical role in protecting the heart from excess lipid accumulation and the formation of toxic lipids in obesity a condition known as cardiac lipotoxicity. This paper focuses on the data supporting and refuting leptin’s role in promoting cardiac hypertrophy as well as its important role in the regulation of cardiac metabolism and protection against cardiac lipotoxicity.
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Lam TN, Harmancey R, Vasquez H, Patel N, Gilbert B, Taegtmeyer H. Abstract 322: Reversal of Intramuscular Lipotoxicity is Mediated by a Novel p62-lipophagy Pathway. Circ Res 2015. [DOI: 10.1161/res.117.suppl_1.322] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background and Hypothesis:
In the mammalian heart, autophagy is considered an adaptive mechanism promoting the removal of protein aggregates or damaged cell organelles. A common feature of non-ischemic heart failure is lipid accumulation. We hypothesize that autophagy is impaired in the muscle in chronic lipid overload. Therefore, we investigated whether activation of autophagy protects myocytes from lipotoxicity.
Methods:
We incubated rat L6 myocytes over a period of 6 days with or without long chain fatty acids (equimolar mixture of oleate and palmitate, 1.0mM). At day 6, an autophagic inhibitor (bafilomycin A1, 200 nM), or an autophagic activator (rapamycin, 1 μM), or both, were added for 48 hours. Following the pharmacologic treatments, glucose uptake was measured using [3H] 2-Deoxy-D-glucose, and insulin sensitivity was assessed. Intracellular triglyceride (TG) accumulation was assessed by Oil Red O staining and immunofluorescence and was quantified enzymatically. Protein markers of autophagic flux (LC3 and p62) and cell death (Caspase 3 cleavage) were measured by immunoblotting.
Results:
Inhibition of autophagy using bafilomycin increased TG accumulation and also increased fatty acid-mediated cell death. Conversely, activation of autophagy using rapamycin reduced both intracellular lipid accumulation and cell death. Unexpectedly, treatment with both rapamycin and bafilomycin resulted in a decrease in lipid accumulation. Immunoblotting indicated p62 degradation (autophagic flux), while immunofluorescence revealed the colocalization of p62 with lipid droplets in these cells. These findings indicate the potential association of p62 with lipid droplet turnover, which is a novel pathway for the breakdown of lipid droplets in muscle cells. In the same cells, rapamycin treatment increased glucose uptake, in response to insulin (100mM).
Conclusions:
Autophagy promotes the clearance of lipids from myocytes, improves insulin sensitivity, and switches to an alternative p62 mediated pathway of lipophagy in the context of chronic lipid overload. Moreover, lipophagy promotes metabolic adaptation and myocyte survival.
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Rouet P, Harmancey R, Turkieh A, Caubère C, Barutaut M, Koukoui F, Dambrin C, Galinier M, Smih F. [A matter of fat: APOO regulates mitochondrial function in the heart]. Med Sci (Paris) 2015; 31:31-4. [PMID: 25658728 DOI: 10.1051/medsci/20153101010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Philippe Rouet
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
| | - Romain Harmancey
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
| | - Annie Turkieh
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
| | - Céline Caubère
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
| | - Manon Barutaut
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
| | - François Koukoui
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
| | - Camille Dambrin
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
| | - Michel Galinier
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
| | - Fatima Smih
- Inserm U1048, équipe 7, obésité et insuffisance cardiaque : approches moléculaires et cliniques, BP 84225, 1, avenue Jean Poulhès, 31432 Toulouse Cedex 4, France
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Kamel PI, Qu X, Geiszler AM, Nagrath D, Harmancey R, Taegtmeyer H, Grande-Allen KJ. Metabolic regulation of collagen gel contraction by porcine aortic valvular interstitial cells. J R Soc Interface 2014; 11:20140852. [PMID: 25320066 PMCID: PMC4223906 DOI: 10.1098/rsif.2014.0852] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 09/22/2014] [Indexed: 12/20/2022] Open
Abstract
Despite a high incidence of calcific aortic valve disease in metabolic syndrome, there is little information about the fundamental metabolism of heart valves. Cell metabolism is a first responder to chemical and mechanical stimuli, but it is unknown how such signals employed in valve tissue engineering impact valvular interstitial cell (VIC) biology and valvular disease pathogenesis. In this study porcine aortic VICs were seeded into three-dimensional collagen gels and analysed for gel contraction, lactate production and glucose consumption in response to manipulation of metabolic substrates, including glucose, galactose, pyruvate and glutamine. Cell viability was also assessed in two-dimensional culture. We found that gel contraction was sensitive to metabolic manipulation, particularly in nutrient-depleted medium. Contraction was optimal at an intermediate glucose concentration (2 g l(-1)) with less contraction with excess (4.5 g l(-1)) or reduced glucose (1 g l(-1)). Substitution with galactose delayed contraction and decreased lactate production. In low sugar concentrations, pyruvate depletion reduced contraction. Glutamine depletion reduced cell metabolism and viability. Our results suggest that nutrient depletion and manipulation of metabolic substrates impacts the viability, metabolism and contractile behaviour of VICs. Particularly, hyperglycaemic conditions can reduce VIC interaction with and remodelling of the extracellular matrix. These results begin to link VIC metabolism and macroscopic behaviour such as cell-matrix interaction.
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Affiliation(s)
- Peter I Kamel
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77005, USA
| | - Xin Qu
- Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Andrew M Geiszler
- Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Deepak Nagrath
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005, USA
| | - Romain Harmancey
- Department of Internal Medicine, Division of Cardiology, The University of Texas Medical School at Houston, Houston, TX 77030, USA
| | - Heinrich Taegtmeyer
- Department of Internal Medicine, Division of Cardiology, The University of Texas Medical School at Houston, Houston, TX 77030, USA
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Guzmán S, Marin S, Miranda A, Selivanov VA, Centelles JJ, Harmancey R, Smih F, Turkieh A, Durocher Y, Zorzano A, Rouet P, Cascante M. (13)C metabolic flux analysis shows that resistin impairs the metabolic response to insulin in L6E9 myotubes. BMC Syst Biol 2014; 8:109. [PMID: 25217974 PMCID: PMC4363945 DOI: 10.1186/s12918-014-0109-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 08/29/2014] [Indexed: 12/11/2022]
Abstract
Background It has been suggested that the adipokine resistin links obesity and insulin resistance, although how resistin acts on muscle metabolism is controversial. We aimed to quantitatively analyse the effects of resistin on the glucose metabolic flux profile and on insulin response in L6E9 myotubes at the metabolic level using a tracer-based metabolomic approach and our in-house developed software, Isodyn. Results Resistin significantly increased glucose uptake and glycolysis, altering pyruvate utilisation by the cell. In the presence of resistin, insulin only slightly increased glucose uptake and glycolysis, and did not alter the flux profile around pyruvate induced by resistin. Resistin prevented the increase in gene expression in pyruvate dehydrogenase-E1 and the sharp decrease in gene expression in cytosolic phosphoenolpyruvate carboxykinase-1 induced by insulin. Conclusions These data suggest that resistin impairs the metabolic activation of insulin. This impairment cannot be explained by the activity of a single enzyme, but instead due to reorganisation of the whole metabolic flux distribution.
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Affiliation(s)
- Shirley Guzmán
- Department of Biochemistry and Molecular Biology, Faculty of Biology, Universitat de Barcelona, Av Diagonal 643, 08028, Barcelona, Spain. .,Institute of Biomedicine of Universitat de Barcelona (IBUB) and CSIC-Associated Unit, Barcelona, Spain.
| | - Silvia Marin
- Department of Biochemistry and Molecular Biology, Faculty of Biology, Universitat de Barcelona, Av Diagonal 643, 08028, Barcelona, Spain. .,Institute of Biomedicine of Universitat de Barcelona (IBUB) and CSIC-Associated Unit, Barcelona, Spain.
| | - Anibal Miranda
- Department of Biochemistry and Molecular Biology, Faculty of Biology, Universitat de Barcelona, Av Diagonal 643, 08028, Barcelona, Spain. .,Institute of Biomedicine of Universitat de Barcelona (IBUB) and CSIC-Associated Unit, Barcelona, Spain.
| | - Vitaly A Selivanov
- Department of Biochemistry and Molecular Biology, Faculty of Biology, Universitat de Barcelona, Av Diagonal 643, 08028, Barcelona, Spain. .,Institute of Biomedicine of Universitat de Barcelona (IBUB) and CSIC-Associated Unit, Barcelona, Spain.
| | - Josep J Centelles
- Department of Biochemistry and Molecular Biology, Faculty of Biology, Universitat de Barcelona, Av Diagonal 643, 08028, Barcelona, Spain. .,Institute of Biomedicine of Universitat de Barcelona (IBUB) and CSIC-Associated Unit, Barcelona, Spain.
| | - Romain Harmancey
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR 1048, Toulouse, France. .,Université Toulouse III Paul-Sabatier, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Equipe n°7, Toulouse, France.
| | - Fatima Smih
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR 1048, Toulouse, France. .,Université Toulouse III Paul-Sabatier, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Equipe n°7, Toulouse, France.
| | - Annie Turkieh
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR 1048, Toulouse, France. .,Université Toulouse III Paul-Sabatier, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Equipe n°7, Toulouse, France.
| | - Yves Durocher
- Animal Cell Technology Group, Biotechnology Research Institute, National Research Council Canada, Montreal, QC, Canada.
| | - Antonio Zorzano
- Department of Biochemistry and Molecular Biology, Faculty of Biology, Universitat de Barcelona, Av Diagonal 643, 08028, Barcelona, Spain. .,Institute for Research in Biomedicine (IRB Barcelona) and CIBER of Diabetes and Associated Metabolic Diseases (CIBERDEM), Barcelona, Spain.
| | - Philippe Rouet
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR 1048, Toulouse, France. .,Université Toulouse III Paul-Sabatier, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Equipe n°7, Toulouse, France.
| | - Marta Cascante
- Department of Biochemistry and Molecular Biology, Faculty of Biology, Universitat de Barcelona, Av Diagonal 643, 08028, Barcelona, Spain. .,Institute of Biomedicine of Universitat de Barcelona (IBUB) and CSIC-Associated Unit, Barcelona, Spain.
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Turkieh A, Caubère C, Barutaut M, Desmoulin F, Harmancey R, Galinier M, Berry M, Dambrin C, Polidori C, Casteilla L, Koukoui F, Rouet P, Smih F. Apolipoprotein O is mitochondrial and promotes lipotoxicity in heart. J Clin Invest 2014; 124:2277-86. [PMID: 24743151 DOI: 10.1172/jci74668] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 02/20/2014] [Indexed: 12/16/2022] Open
Abstract
Diabetic cardiomyopathy is a secondary complication of diabetes with an unclear etiology. Based on a functional genomic evaluation of obesity-associated cardiac gene expression, we previously identified and cloned the gene encoding apolipoprotein O (APOO), which is overexpressed in hearts from diabetic patients. Here, we generated APOO-Tg mice, transgenic mouse lines that expresses physiological levels of human APOO in heart tissue. APOO-Tg mice fed a high-fat diet exhibited depressed ventricular function with reduced fractional shortening and ejection fraction, and myocardial sections from APOO-Tg mice revealed mitochondrial degenerative changes. In vivo fluorescent labeling and subcellular fractionation revealed that APOO localizes with mitochondria. Furthermore, APOO enhanced mitochondrial uncoupling and respiration, both of which were reduced by deletion of the N-terminus and by targeted knockdown of APOO. Consequently, fatty acid metabolism and ROS production were enhanced, leading to increased AMPK phosphorylation and Ppara and Pgc1a expression. Finally, we demonstrated that the APOO-induced cascade of events generates a mitochondrial metabolic sink whereby accumulation of lipotoxic byproducts leads to lipoapoptosis, loss of cardiac cells, and cardiomyopathy, mimicking the diabetic heart-associated metabolic phenotypes. Our data suggest that APOO represents a link between impaired mitochondrial function and cardiomyopathy onset, and targeting APOO-dependent metabolic remodeling has potential as a strategy to adjust heart metabolism and protect the myocardium from impaired contractility.
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Harmancey R, Haight D, Taegtmeyer H. Chronic hyperinsulinemia impairs insulin signaling and downregulates uncoupling protein 3 in mouse heart (1155.4). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.1155.4] [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)
- Romain Harmancey
- Internal Medicine The University of Texas Medical School at HoustonHOUSTONTXUnited States
| | - Derek Haight
- Internal Medicine The University of Texas Medical School at HoustonHOUSTONTXUnited States
| | - Heinrich Taegtmeyer
- Internal Medicine The University of Texas Medical School at HoustonHOUSTONTXUnited States
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Abstract
Reversing impaired insulin sensitivity has been suggested as treatment for heart failure. However, recent clinical evidence suggests the opposite. Here we present a line of reasoning in support of the hypothesis that insulin resistance protects the heart from the consequences of fuel overload in the dysregulated metabolic state of obesity and diabetes. We discuss pathways of myocardial fuel toxicity, as well as several layers of defense against fuel overload. Our reassessment of the literature suggests that in the heart, insulin-sensitizing agents result in an elimination of some of the defenses, leading to cytotoxic damage. In contrast, a normalization of fuel supply should either prevent or reverse the process. Taken together, we offer a new perspective on insulin resistance of the heart.
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Affiliation(s)
- Heinrich Taegtmeyer
- Division of Cardiology, Department of Internal Medicine, The University of Texas School of Medicine at Houston, Houston, Texas
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41
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Harmancey R, Vasquez HG, Guthrie PH, Taegtmeyer H. Decreased long-chain fatty acid oxidation impairs postischemic recovery of the insulin-resistant rat heart. FASEB J 2013; 27:3966-78. [PMID: 23825227 DOI: 10.1096/fj.13-234914] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Diabetic patients with acute myocardial infarction are more likely to die than nondiabetic patients. In the present study we examined the effect of insulin resistance on myocardial ischemia tolerance. Hearts of rats, rendered insulin resistant by high-sucrose feeding, were subjected to ischemia/reperfusion ex vivo. Cardiac power of control hearts from chow-fed rats recovered to 93%, while insulin-resistant hearts recovered only to 80% (P<0.001 vs. control). Unexpectedly, impaired contractile recovery did not result from an impairment of glucose oxidation (576±36 vs. 593±42 nmol/min/g dry weight; not significant), but from a failure to increase and to sustain oxidation of the long-chain fatty acid oleate on reperfusion (1878±56 vs. 2070±67 nmol/min/g dry weight; P<0.05). This phenomenon was due to a reduced ability to transport oleate into mitochondria and associated with a 38-58% decrease in the mitochondrial uncoupling protein 3 (UCP3) levels. Contractile function was rescued by replacing oleate with a medium-chain fatty acid or by restoring UCP3 levels with 24 h of food withdrawal. Lastly, the knockdown of UCP3 in rat L6 myocytes also decreased oleate oxidation by 13-18% following ischemia. Together the results expose UCP3 as a critical regulator of long-chain fatty acid oxidation in the stressed heart postischemia and identify octanoate as an intervention by which myocardial metabolism can be manipulated to improve function of the insulin-resistant heart.
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Affiliation(s)
- Romain Harmancey
- 1University of Texas Medical School at Houston, 6431 Fannin, MSB 1.246, Houston, TX 77030, USA.
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Harmancey R, Vasquez HG, Guthrie PH, Taegtmeyer H. Decreased fatty acid oxidation impairs contractile recovery of the insulin resistant heart post‐ischemia. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.1191.3] [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)
- Romain Harmancey
- Internal MedicineThe University of Texas Medical School at HoustonHoustonTX
| | - Hernan G. Vasquez
- Internal MedicineThe University of Texas Medical School at HoustonHoustonTX
| | - Patrick H. Guthrie
- Internal MedicineThe University of Texas Medical School at HoustonHoustonTX
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Lam TN, Harmancey R, Taegtmeyer H. Abstract 266: Autophagy Reverses Intramuscular Lipid Accumulation in Myocytes. Circ Res 2012. [DOI: 10.1161/res.111.suppl_1.a266] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Autophagy, or “self-eating” of the cell, is a tightly regulated “housekeeping” process involved in the degradation and recycling of protein aggregates and damaged organelles. In the failing heart, autophagy has been shown to be an adaptive response. We have previously demonstrated that a common feature of non-ischemic heart failure is lipid accumulation, which in excess can mediate cardiac dysfunction via lipotoxicity. Since autophagy mediates the clearance of lipids through a specific process, known as lipophagy, in hepatocytes, we wondered whether the activation of autophagy in the failing heart protects myocyte from lipotoxicity. To test this hypothesis, L6 myocytes were incubated over a period of 6 days with long chain fatty acids, either 0.5mM or 1.0mM fatty acids (equimolar mixture of oleate and palmitate). On the sixth day of treatment, an autophagic inhibitor (bafilomycin A1, 200nM) or autophagic activator (rapamycin, 1uM) was added to the cell culture medium for 24 hours. Intracellular triglyceride (TG) accumulation was measured in the cells using enzyme quantification assay as well as Oil Red O stain. Immunoblotting was also performed on protein markers to confirm autophagic flux (LC3 and P62) and cell death (Caspase3) in the myocytes. The results indicated that increasing concentrations of fatty acids gradually increased intracellular TG accumulation. Inhibition of autophagy using bafilomycin increased this effect whereas activation of autophagy using rapamycin reduced lipid accumulation in the L6 myocytes. Moreover, fatty acid mediated cell death was increased when autophagy is inhibited. We conclude that autophagy promotes the clearance of lipids from cultured myocytes. These findings suggest that lipophagy may be a protective mechanism in the myocyte through the decrease and reversal of intracellular lipid accumulation.
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Harmancey R, Lam TN, Lubrano GM, Guthrie PH, Vela D, Taegtmeyer H. Insulin resistance improves metabolic and contractile efficiency in stressed rat heart. FASEB J 2012; 26:3118-26. [PMID: 22611083 DOI: 10.1096/fj.12-208991] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Insulin resistance is a prominent feature in heart failure, while hyperglycemia impairs cardiac contraction. We propose that decreased insulin-mediated glucose uptake by the heart preserves cardiac function in response to metabolic and hemodynamic stress. To test this hypothesis, we fed rats a high-sucrose diet (HSD). Energy substrate metabolism and cardiac work were determined ex vivo in a sequential protocol simulating metabolic and hemodynamic stress. Compared to chow-fed, control rats, HSD impaired myocardial insulin responsiveness and induced profound metabolic changes in the heart, characterized by reduced rates of glucose uptake (7.91 ± 0.30 vs. 10.73 ± 0.67 μmol/min/g dry weight; P<0.001) but increased rates of glucose oxidation (2.38 ± 0.17 vs. 1.50 ± 0.15 μmol/min/g dry weight; P<0.001) and oleate oxidation (2.29 ± 0.11 vs. 1.96 ± 0.12 μmol/min/g dry weight; P<0.05). Tight coupling of glucose uptake and oxidation and improved cardiac efficiency were associated with a reduction in glucose 6-phosphate and oleoyl-CoA levels, as well as a reduction in the content of uncoupling protein 3. Our results suggest that insulin resistance lessens fuel toxicity in the stressed heart. This calls for a new exploration of the mechanisms regulating substrate uptake and oxidation in the insulin-resistant heart.
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Affiliation(s)
- Romain Harmancey
- Department of Internal Medicine, Division of Cardiology, University of Texas Medical School at Houston, Houston, Texas 77030, USA.
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Harmancey R, Lubrano G, Lam TN, Taegtmeyer H. Chronic hyperinsulinemia sensitizes myocytes to hyperglycemia‐induced cell death. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.869.24] [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)
- Romain Harmancey
- Internal MedicineUniversity of Texas Health Science CenterHoustonTX
| | - Genna Lubrano
- Internal MedicineUniversity of Texas Health Science CenterHoustonTX
| | - Truong N. Lam
- Internal MedicineUniversity of Texas Health Science CenterHoustonTX
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Smih F, Desmoulin F, Berry M, Turkieh A, Harmancey R, Iacovoni J, Trouillet C, Delmas C, Pathak A, Lairez O, Koukoui F, Massabuau P, Ferrieres J, Galinier M, Rouet P. 103 White blood cell genes expressions provide a molecular signature for pre-heart failure. Archives of Cardiovascular Diseases Supplements 2012. [DOI: 10.1016/s1878-6480(12)70499-8] [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: 11/30/2022]
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Harmancey R, Lam T, Lubrano G, Vela D, Taegtmeyer H. Abstract P243: Simultaneous Decrease in Glucose Uptake, Increase in Glucose Oxidation, and Improved Contractile Function by Hearts from Sucrose-Fed Rats. Circ Res 2011. [DOI: 10.1161/res.109.suppl_1.ap243] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The heart responds to acute hemodynamic stress by increasing carbohydrate oxidation. This metabolic response is impaired in diabetes when excess fatty acid availability inhibits glucose oxidation (Randle's “glucose-fatty acid cycle”). Impaired glucose uptake and oxidation are believed to result in energy deficiency and poor contractile function. We now propose that in the heart insulin resistance, defined by impaired uptake of glucose in response to insulin, is an endogenous protective mechanism which prevents excess uptake of fuel when supply is increased. To test this we fed Sprague-Dawley rats either a high-sucrose diet or regular chow diet. After 5 to 8 weeks systemic insulin sensitivity was impaired in sucrose-fed rats. Hearts were then perfused
ex vivo
in the working mode to measure function and metabolism. Rates of glucose uptake by the heart of sucrose-fed animals were decreased in response to insulin. Cardiac power remained unchanged in hearts perfused with either normal (5mM glucose; 0.4mM oleate; 0.5ng/ml insulin) or high (25mM glucose; 0.8mM oleate; 5ng/ml insulin) concentrations of substrates. However, cardiac power
increased
for the insulin-resistant hearts compared to controls when a hemodynamic stress (afterload raised from 100 to 140cm H
2
O; 1µM epinephrine) was superimposed on nutrient stress. The ratio of glucose-to-oleate oxidation was also markedly increased in these hearts, as was cardiac efficiency. Higher glucose oxidation rates correlated with increased pyruvate dehydrogenase (PDH) activity, and lower uncoupling protein 3 (UCP3) expression. In conclusion, insulin resistance promotes adaptation of the stressed heart by increasing glucose oxidation while limiting excess fuel uptake. Our findings call for a new interpretation of the glucose-fatty acid cycle in the heart.
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Smih F, Desmoulin F, Berry M, Turkieh A, Harmancey R, Iacovoni J, Trouillet C, Delmas C, Pathak A, Lairez O, Koukoui F, Massabuau P, Ferrieres J, Galinier M, Rouet P. Blood signature of pre-heart failure: a microarrays study. PLoS One 2011; 6:e20414. [PMID: 21731613 PMCID: PMC3123284 DOI: 10.1371/journal.pone.0020414] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 05/02/2011] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The preclinical stage of systolic heart failure (HF), known as asymptomatic left ventricular dysfunction (ALVD), is diagnosed only by echocardiography, frequent in the general population and leads to a high risk of developing severe HF. Large scale screening for ALVD is a difficult task and represents a major unmet clinical challenge that requires the determination of ALVD biomarkers. METHODOLOGY/PRINCIPAL FINDINGS 294 individuals were screened by echocardiography. We identified 9 ALVD cases out of 128 subjects with cardiovascular risk factors. White blood cell gene expression profiling was performed using pangenomic microarrays. Data were analyzed using principal component analysis (PCA) and Significant Analysis of Microarrays (SAM). To build an ALVD classifier model, we used the nearest centroid classification method (NCCM) with the ClaNC software package. Classification performance was determined using the leave-one-out cross-validation method. Blood transcriptome analysis provided a specific molecular signature for ALVD which defined a model based on 7 genes capable of discriminating ALVD cases. Analysis of an ALVD patients validation group demonstrated that these genes are accurate diagnostic predictors for ALVD with 87% accuracy and 100% precision. Furthermore, Receiver Operating Characteristic curves of expression levels confirmed that 6 out of 7 genes discriminate for left ventricular dysfunction classification. CONCLUSIONS/SIGNIFICANCE These targets could serve to enhance the ability to efficiently detect ALVD by general care practitioners to facilitate preemptive initiation of medical treatment preventing the development of HF.
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Affiliation(s)
- Fatima Smih
- INSERM/Universite Paul Sabatier UMR 1048, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Toulouse, France.
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Ballal K, Wilson CR, Harmancey R, Taegtmeyer H. Obesogenic high fat western diet induces oxidative stress and apoptosis in rat heart. Mol Cell Biochem 2010; 344:221-30. [PMID: 20676734 DOI: 10.1007/s11010-010-0546-y] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Accepted: 07/15/2010] [Indexed: 01/23/2023]
Abstract
Feeding Wistar rats a high calorie "Western" diet (45% fat) for up to 48 weeks induces obesity and cardiac dysfunction, while a high fat diet (60% fat) induces obesity only. Here we investigated the molecular "footprints" of the two forms of diet-induced obesity in the heart. In rats fed Western diet for a long term, cardiac mRNA transcript levels of malic enzyme were decreased (-72%, P < 0.05), suggesting impaired anaplerotic flux of the Krebs cycle (KC) and mitochondrial dysfunction. In addition, there was a marked decrease in the expression of the transcription factor MEF2C (myocyte enhancer factor 2C) and its target gene SERCA2a (sarco-endo-plasmic reticulum Ca(2+)-ATPase). Oxidative stress was reflected in reduced transcript levels of manganese superoxide dismutase, glutathione peroxidase 1, and increased protein levels of mitochondrial transcription factor A, suggesting compensatory mitochondrial biogenesis in the face of increased mitochondrial damage. Oxidant injury was accompanied by increased protein glycosylation, increased transcript levels of glutamine fructose 6-phosphate amidotransferase 2, and decreased protein levels of acetyl Co-A carboxylase. Lastly, apoptosis was evident by TUNEL positivity and elevated mRNA transcript levels and activity of caspase 3. Consistent with these results, protein levels of Bcl2 were markedly reduced. We conclude that inadequate supplementation of KC intermediates due to reduced levels of malic enzyme, downregulation of MEF2C and its target gene SERCA2a, oxidative stress, and programmed cell death are all potential contributors to contractile dysfunction of the heart.
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Affiliation(s)
- Kalpana Ballal
- Division of Cardiology, Department of Internal Medicine, The University of Texas Medical School at Houston, Houston, TX 77030, USA
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