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Challa AA, Vidal P, Maurya SK, Maurya CK, Baer LA, Wang Y, James NM, Pardeshi PJ, Fasano M, Carley AN, Stanford KI, Lewandowski ED. UCP1-dependent brown adipose activation accelerates cardiac metabolic remodeling and reduces initial hypertrophic and fibrotic responses to pathological stress. FASEB J 2024; 38:e23709. [PMID: 38809700 PMCID: PMC11163965 DOI: 10.1096/fj.202400922r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 05/06/2024] [Accepted: 05/16/2024] [Indexed: 05/31/2024]
Abstract
Brown adipose tissue (BAT) is correlated to cardiovascular health in rodents and humans, but the physiological role of BAT in the initial cardiac remodeling at the onset of stress is unknown. Activation of BAT via 48 h cold (16°C) in mice following transverse aortic constriction (TAC) reduced cardiac gene expression for LCFA uptake and oxidation in male mice and accelerated the onset of cardiac metabolic remodeling, with an early isoform shift of carnitine palmitoyltransferase 1 (CPT1) toward increased CPT1a, reduced entry of long chain fatty acid (LCFA) into oxidative metabolism (0.59 ± 0.02 vs. 0.72 ± 0.02 in RT TAC hearts, p < .05) and increased carbohydrate oxidation with altered glucose transporter content. BAT activation with TAC reduced early hypertrophic expression of β-MHC by 61% versus RT-TAC and reduced pro-fibrotic TGF-β1 and COL3α1 expression. While cardiac natriuretic peptide expression was yet to increase at only 3 days TAC, Nppa and Nppb expression were elevated in Cold TAC versus RT TAC hearts 2.7- and 2.4-fold, respectively. Eliminating BAT thermogenic activation with UCP1 KO mice eliminated differences between Cold TAC and RT TAC hearts, confirming effects of BAT activation rather than autonomous cardiac responses to cold. Female responses to BAT activation were blunted, with limited UCP1 changes with cold, partly due to already activated BAT in females at RT compared to thermoneutrality. These data reveal a previously unknown physiological mechanism of UCP1-dependent BAT activation in attenuating early cardiac hypertrophic and profibrotic signaling and accelerating remodeled metabolic activity in the heart at the onset of cardiac stress.
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Affiliation(s)
- Azariyas A. Challa
- Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
| | - Pablo Vidal
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Department of Physiology and Cell Biology, College of Medicine, Ohio State University. Columbus, OH., 43210, USA
- Department of Surgery, General and Gastrointestinal Surgery, College of Medicine, The Ohio State University. Columbus, OH., 43210, USA
| | - Santosh K. Maurya
- Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
| | - Chandan K. Maurya
- Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
| | - Lisa A. Baer
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Department of Physiology and Cell Biology, College of Medicine, Ohio State University. Columbus, OH., 43210, USA
- Department of Surgery, General and Gastrointestinal Surgery, College of Medicine, The Ohio State University. Columbus, OH., 43210, USA
| | - Yang Wang
- Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
| | - Natasha Maria James
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Department of Physiology and Cell Biology, College of Medicine, Ohio State University. Columbus, OH., 43210, USA
- Department of Surgery, General and Gastrointestinal Surgery, College of Medicine, The Ohio State University. Columbus, OH., 43210, USA
| | - Parth J. Pardeshi
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Department of Physiology and Cell Biology, College of Medicine, Ohio State University. Columbus, OH., 43210, USA
- Department of Surgery, General and Gastrointestinal Surgery, College of Medicine, The Ohio State University. Columbus, OH., 43210, USA
| | - Matthew Fasano
- Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
| | - Andrew N. Carley
- Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
| | - Kristin I. Stanford
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Department of Physiology and Cell Biology, College of Medicine, Ohio State University. Columbus, OH., 43210, USA
- Department of Surgery, General and Gastrointestinal Surgery, College of Medicine, The Ohio State University. Columbus, OH., 43210, USA
| | - E. Douglas Lewandowski
- Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
- Davis Heart and Lung Research Institute and Department of Internal Medicine, College of Medicine, Ohio State University. Columbus, OH, 43210, USA
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Nekolla SG, Rischpler C, Higuchi T. Preclinical Imaging of Cardiovascular Disesase. Semin Nucl Med 2023; 53:586-598. [PMID: 37268498 DOI: 10.1053/j.semnuclmed.2023.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 04/24/2023] [Accepted: 04/26/2023] [Indexed: 06/04/2023]
Abstract
Noninvasive imaging techniques, such as SPECT, PET, CT, echocardiography, or MRI, have become essential in cardiovascular research. They allow for the evaluation of biological processes in vivo without the need for invasive procedures. Nuclear imaging methods, such as SPECT and PET, offer numerous advantages, including high sensitivity, reliable quantification, and the potential for serial imaging. Modern SPECT and PET imaging systems, equipped with CT and MRI components in order to get access to morphological information with high spatial resolution, are capable of imaging a wide range of established and innovative agents in both preclinical and clinical settings. This review highlights the utility of SPECT and PET imaging as powerful tools for translational research in cardiology. By incorporating these techniques into a well-defined workflow- similar to those used in clinical imaging- the concept of "bench to bedside" can be effectively implemented.
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Affiliation(s)
- Stephan G Nekolla
- Nuklearmedizinische Klinik der TU München, Munich, Germany; DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany.
| | | | - Takahiro Higuchi
- Department of Nuclear Medicine, University Hospital Würzburg, Würzburg, Germany; Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
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Li J, Minczuk K, Huang Q, Kemp BA, Howell NL, Chordia MD, Roy RJ, Patrie JT, Qureshi Z, Kramer CM, Epstein FH, Carey RM, Kundu BK, Keller SR. Progressive Cardiac Metabolic Defects Accompany Diastolic and Severe Systolic Dysfunction in Spontaneously Hypertensive Rat Hearts. J Am Heart Assoc 2023; 12:e026950. [PMID: 37183873 PMCID: PMC10227297 DOI: 10.1161/jaha.122.026950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 04/14/2023] [Indexed: 05/16/2023]
Abstract
Background Cardiac metabolic abnormalities are present in heart failure. Few studies have followed metabolic changes accompanying diastolic and systolic heart failure in the same model. We examined metabolic changes during the development of diastolic and severe systolic dysfunction in spontaneously hypertensive rats (SHR). Methods and Results We serially measured myocardial glucose uptake rates with dynamic 2-[18F] fluoro-2-deoxy-d-glucose positron emission tomography in vivo in 9-, 12-, and 18-month-old SHR and Wistar Kyoto rats. Cardiac magnetic resonance imaging determined systolic function (ejection fraction) and diastolic function (isovolumetric relaxation time) and left ventricular mass in the same rats. Cardiac metabolomics was performed at 12 and 18 months in separate rats. At 12 months, SHR hearts, compared with Wistar Kyoto hearts, demonstrated increased isovolumetric relaxation time and slightly reduced ejection fraction indicating diastolic and mild systolic dysfunction, respectively, and higher (versus 9-month-old SHR decreasing) 2-[18F] fluoro-2-deoxy-d-glucose uptake rates (Ki). At 18 months, only few SHR hearts maintained similar abnormalities as 12-month-old SHR, while most exhibited severe systolic dysfunction, worsening diastolic function, and markedly reduced 2-[18F] fluoro-2-deoxy-d-glucose uptake rates. Left ventricular mass normalized to body weight was elevated in SHR, more pronounced with severe systolic dysfunction. Cardiac metabolite changes differed between SHR hearts at 12 and 18 months, indicating progressive defects in fatty acid, glucose, branched chain amino acid, and ketone body metabolism. Conclusions Diastolic and severe systolic dysfunction in SHR are associated with decreasing cardiac glucose uptake, and progressive abnormalities in metabolite profiles. Whether and which metabolic changes trigger progressive heart failure needs to be established.
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Affiliation(s)
- Jie Li
- Department of Radiology and Medical ImagingUniversity of VirginiaCharlottesvilleVA
| | - Krzysztof Minczuk
- Department of Radiology and Medical ImagingUniversity of VirginiaCharlottesvilleVA
- Department of Experimental Physiology and PathophysiologyMedical University of BiałystokBialystokPoland
| | - Qiao Huang
- Department of Radiology and Medical ImagingUniversity of VirginiaCharlottesvilleVA
| | - Brandon A. Kemp
- Department of Medicine, Division of Endocrinology and MetabolismUniversity of VirginiaCharlottesvilleVA
| | - Nancy L. Howell
- Department of Medicine, Division of Endocrinology and MetabolismUniversity of VirginiaCharlottesvilleVA
| | - Mahendra D. Chordia
- Department of Radiology and Medical ImagingUniversity of VirginiaCharlottesvilleVA
| | - R. Jack Roy
- Department of Radiology and Medical ImagingUniversity of VirginiaCharlottesvilleVA
| | - James T. Patrie
- Department of Public Health SciencesUniversity of VirginiaCharlottesvilleVA
| | - Zoraiz Qureshi
- Department of Radiology and Medical ImagingUniversity of VirginiaCharlottesvilleVA
- Department of Computer ScienceUniversity of VirginiaCharlottesvilleVA
| | - Christopher M. Kramer
- Department of Medicine, Cardiovascular DivisionUniversity of VirginiaCharlottesvilleVA
| | | | - Robert M. Carey
- Department of Medicine, Division of Endocrinology and MetabolismUniversity of VirginiaCharlottesvilleVA
| | - Bijoy K. Kundu
- Department of Radiology and Medical ImagingUniversity of VirginiaCharlottesvilleVA
- Department of Biomedical EngineeringUniversity of VirginiaCharlottesvilleVA
- Cardiovascular Research CenterUniversity of VirginiaCharlottesvilleVA
| | - Susanna R. Keller
- Department of Medicine, Division of Endocrinology and MetabolismUniversity of VirginiaCharlottesvilleVA
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Dourado MLC, Dompieri LT, Leitão GM, Mourato FA, Santos RGG, Almeida PJ, Markman B, Melo MDT, Brandão SCS. Aumento de Captação Cardíaca de 18F-FDG Induzida por Quimioterapia em Pacientes com Linfoma: Um Marcador Precoce de Cardiotoxicidade? Arq Bras Cardiol 2022; 118:1049-1058. [PMID: 35703659 PMCID: PMC9345149 DOI: 10.36660/abc.20210463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 09/01/2021] [Indexed: 11/18/2022] Open
Abstract
Fundamento Ainda não está estabelecido se a captação de fluorodesoxiglicose no miocárdio ocorre exclusivamente por características fisiológicas ou se representa um desarranjo metabólico causado pela quimioterapia. Objetivo Investigar os efeitos da quimioterapia no coração dos pacientes com linfoma por tomografia por emissão de pósitrons associada a tomografia computadorizada (PET/CT) com 2-[18F]-fluoro-2-desoxi-D-glicose (18F-FDG PET/CT) antes, durante e/ou após a quimioterapia. Métodos Setenta pacientes com linfoma submetidos a 18F-FDG PET/CT foram retrospectivamente analisados. O nível de significância foi de 5%. A captação de 18F-FDG foi avaliada por três medidas: captação máxima no ventrículo esquerdo ( standardized uptake value , SUV max), razão SUV cardíaco / aorta e SUV cardíaco / SUV no fígado. Também foram comparados peso corporal, glicemia de jejum, tempo pós-injeção e dose administrada de 18F-FDG entre os exames. Resultados A idade média foi de 50,4 ± 20,1 anos e 50% dos pacientes eram mulheres. A análise foi realizada em dois grupos – PET/CT basal vs. intermediário e PET/CT basal vs pós-terapia. Não houve diferença significativa entre as variáveis clínicas e do protocolo dos exames entre os diferentes momentos avaliados. Nós observamos um aumento na SUV máxima no ventrículo esquerdo de 3,5±1,9 (basal) para 5,6±4,0 (intermediário), p=0,01, e de 4,0±2,2 (basal) para 6,1±4,2 (pós-terapia), p<0,001. Uma porcentagem de aumento ≥30% na SUV máxima no ventrículo esquerdo ocorreu em mais da metade da amostra. O aumento da SUV cardíaca foi acompanhado por um aumento na razão SUV máxima no ventrículo esquerdo / SUV máxima na aorta e SUV média no ventrículo esquerdo /SUV média no fígado. Conclusão O estudo mostrou um aumento evidente na captação cardíaca de 18F-FDG em pacientes com linfoma, durante e após quimioterapia. A literatura corrobora com esses achados e sugere que a 18F-FDG PET/CT pode ser um exame de imagem sensível e confiável para detectar sinais metabólicos precoces de cardiotoxicidade.
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Haidar A, Taegtmeyer H. Strategies for Imaging Metabolic Remodeling of the Heart in Obesity and Heart Failure. Curr Cardiol Rep 2022; 24:327-335. [PMID: 35107704 PMCID: PMC9074778 DOI: 10.1007/s11886-022-01650-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/17/2021] [Indexed: 02/07/2023]
Abstract
PURPOSE OF REVIEW Define early myocardial metabolic changes among patients with obesity and heart failure, and to describe noninvasive methods and their applications for imaging cardiac metabolic remodeling. RECENT FINDINGS Metabolic remodeling precedes, triggers, and sustains functional and structural remodeling in the stressed heart. Alterations in cardiac metabolism can be assessed by using a variety of molecular probes. The glucose tracer analog, 18F-FDG, and the labeled tracer 11C-palmitate are still the most commonly used tracers to assess glucose and fatty acid metabolism, respectively. The development of new tracer analogs and imaging agents, including those targeting the peroxisome proliferator-activated receptor (PPAR), provides new opportunities for imaging metabolic activities at a molecular level. While the use of cardiac magnetic resonance spectroscopy in the clinical setting is limited to the assessment of intramyocardial and epicardial fat, new technical improvements are likely to increase its usage in the setting of heart failure. Noninvasive imaging methods are an effective tool for the serial assessment of alterations in cardiac metabolism, either during disease progression, or in response to treatment.
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Affiliation(s)
- Amier Haidar
- McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Heinrich Taegtmeyer
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, 6431 Fannin Street, MSB 1.220, Houston, TX, 77030, USA.
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Liu J, Lian H, Yu J, Wu J, Chen X, wang P, tian L, Yang Y, Yang J, Li D, Guo S. Study on diverse pathological characteristics of heart failure in different stages based on proteomics. J Cell Mol Med 2022; 26:1169-1182. [PMID: 35048506 PMCID: PMC8831959 DOI: 10.1111/jcmm.17170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 12/14/2021] [Accepted: 12/21/2021] [Indexed: 11/30/2022] Open
Abstract
Heart failure is a process characterized by significant disturbance of protein turnover. To elucidate the alterations in cardiac protein expression during the various phases of heart failure and to understand the nature of the processes involved, we analysed the proteome in an established heart failure model at different time points to monitor thousands of different proteins simultaneously. Here, heart failure was induced by transverse aortic constriction (TAC) in KM mice. At 2, 4 and 12 weeks after operation, protein expression profiles were determined in sham‐operated (controls) and TAC mice, using label‐free quantitative proteomics, leading to identification and quantification of almost 4000 proteins. The results of the KEGG pathway enrichment analysis and GO function annotation revealed critical pathways associated with the transition from cardiac hypertrophy to heart failure, such as energy pathways and matrix reorganization. Our study suggests that in the pathophysiology of heart failure, alterations of protein groups related to cardiac energy substrate metabolism and cytoskeleton remodelling could play the more dominant roles for the signalling that eventually results in contractile dysfunction and heart failure.
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Affiliation(s)
- Jinying Liu
- College of Traditional Chinese Medicine Chengde Medical University Chengde Hebei Province China
- School of Traditional Chinese Medicine Beijing University of Chinese Medicine Beijing China
| | - Hongjian Lian
- School of Traditional Chinese Medicine Beijing University of Chinese Medicine Beijing China
- Alexa League Central Hospital Inner Mongolia China
| | - Jiang Yu
- School of Traditional Chinese Medicine Beijing University of Chinese Medicine Beijing China
| | - Jie Wu
- College of Traditional Chinese Medicine Chengde Medical University Chengde Hebei Province China
| | - Xiangyang Chen
- Youcare Pharmaceutical Group Drug Research Institute Beijing China
| | - Peng wang
- College of Traditional Chinese Medicine Chengde Medical University Chengde Hebei Province China
| | - Lei tian
- School of Traditional Chinese Medicine Beijing University of Chinese Medicine Beijing China
| | - Yunfei Yang
- Beijing Qinglian Biotech Co., Ltd Beijing China
| | - Jiaqi Yang
- College of Traditional Chinese Medicine Chengde Medical University Chengde Hebei Province China
| | - Dong Li
- School of Basic Medical Sciences Anhui Medical University Hefei China
- State Key Laboratory of Proteomics Beijing Proteome Research Center National Center for Protein Sciences (PHOENIX Center) Beijing Institute of Lifeomics Beijing China
| | - Shuzhen Guo
- School of Traditional Chinese Medicine Beijing University of Chinese Medicine Beijing China
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Ritterhoff J, McMillen TS, Villet O, Young S, Kolwicz SC, Senn T, Caudal A, Tian R. Increasing fatty acid oxidation elicits a sex-dependent response in failing mouse hearts. J Mol Cell Cardiol 2021; 158:1-10. [PMID: 33989657 PMCID: PMC8405556 DOI: 10.1016/j.yjmcc.2021.05.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 05/06/2021] [Accepted: 05/07/2021] [Indexed: 01/12/2023]
Abstract
BACKGROUND Reduced fatty acid oxidation (FAO) is a hallmark of metabolic remodeling in heart failure. Enhancing mitochondrial long-chain fatty acid uptake by Acetyl-CoA carboxylase 2 (ACC2) deletion increases FAO and prevents cardiac dysfunction during chronic stresses, but therapeutic efficacy of this approach has not been determined. METHODS Male and female ACC2 f/f-MCM (ACC2KO) and their respective littermate controls were subjected to chronic pressure overload by TAC surgery. Tamoxifen injection 3 weeks after TAC induced ACC2 deletion and increased FAO in ACC2KO mice with pathological hypertrophy. RESULTS ACC2 deletion in mice with pre-existing cardiac pathology promoted FAO in female and male hearts, but improved cardiac function only in female mice. In males, pressure overload caused a downregulation in the mitochondrial oxidative function. Stimulating FAO by ACC2 deletion caused unproductive acyl-carnitine accumulation, which failed to improve cardiac energetics. In contrast, mitochondrial oxidative capacity was sustained in female pressure overloaded hearts and ACC2 deletion improved myocardial energetics. Mechanistically, we revealed a sex-dependent regulation of PPARα signaling pathway in heart failure, which accounted for the differential response to ACC2 deletion. CONCLUSION Metabolic remodeling in the failing heart is sex-dependent which could determine the response to metabolic intervention. The findings suggest that both mitochondrial oxidative capacity and substrate preference should be considered for metabolic therapy of heart failure.
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Affiliation(s)
- Julia Ritterhoff
- Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine, University of Washington, Republican Street 850, 98109 Seattle, WA, USA
| | - Timothy S. McMillen
- Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine, University of Washington, Republican Street 850, 98109 Seattle, WA, USA
| | - Outi Villet
- Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine, University of Washington, Republican Street 850, 98109 Seattle, WA, USA
| | - Sara Young
- Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine, University of Washington, Republican Street 850, 98109 Seattle, WA, USA
| | - Stephen C. Kolwicz
- Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine, University of Washington, Republican Street 850, 98109 Seattle, WA, USA.,Heart and Muscle Metabolism Laboratory, Health and Exercise Physiology, Ursinus College, Collegeville, PA 19426, USA
| | - Taurence Senn
- Department of Medicinal Chemistry, School of Pharmacy, University of Washington, H172 Health Science Building, 98195 Seattle, WA, USA
| | - Arianne Caudal
- Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine, University of Washington, Republican Street 850, 98109 Seattle, WA, USA
| | - Rong Tian
- Mitochondria and Metabolism Center, Department of Anesthesiology and Pain Medicine, University of Washington, Republican Street 850, 98109 Seattle, WA, USA.,Corresponding author at: Mitochondria and Metabolism Center, University of Washington School of Medicine, 850 Republican Street, Seattle, WA 98109
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8
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Davogustto GE, Salazar RL, Vasquez HG, Karlstaedt A, Dillon WP, Guthrie PH, Martin JR, Vitrac H, De La Guardia G, Vela D, Ribas-Latre A, Baumgartner C, Eckel-Mahan K, Taegtmeyer H. Metabolic remodeling precedes mTORC1-mediated cardiac hypertrophy. J Mol Cell Cardiol 2021; 158:115-127. [PMID: 34081952 DOI: 10.1016/j.yjmcc.2021.05.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 05/21/2021] [Accepted: 05/26/2021] [Indexed: 11/17/2022]
Abstract
RATIONALE The nutrient sensing mechanistic target of rapamycin complex 1 (mTORC1) and its primary inhibitor, tuberin (TSC2), are cues for the development of cardiac hypertrophy. The phenotype of mTORC1 induced hypertrophy is unknown. OBJECTIVE To examine the impact of sustained mTORC1 activation on metabolism, function, and structure of the adult heart. METHODS AND RESULTS We developed a mouse model of inducible, cardiac-specific sustained mTORC1 activation (mTORC1iSA) through deletion of Tsc2. Prior to hypertrophy, rates of glucose uptake and oxidation, as well as protein and enzymatic activity of glucose 6-phosphate isomerase (GPI) were decreased, while intracellular levels of glucose 6-phosphate (G6P) were increased. Subsequently, hypertrophy developed. Transcript levels of the fetal gene program and pathways of exercise-induced hypertrophy increased, while hypertrophy did not progress to heart failure. We therefore examined the hearts of wild-type mice subjected to voluntary physical activity and observed early changes in GPI, followed by hypertrophy. Rapamycin prevented these changes in both models. CONCLUSION Activation of mTORC1 in the adult heart triggers the development of a non-specific form of hypertrophy which is preceded by changes in cardiac glucose metabolism.
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Affiliation(s)
- Giovanni E Davogustto
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Rebecca L Salazar
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Hernan G Vasquez
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Anja Karlstaedt
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - William P Dillon
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Patrick H Guthrie
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Joseph R Martin
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA
| | | | - Gina De La Guardia
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Deborah Vela
- Cardiovascular Pathology Research Laboratory, Texas Heart Institute at CHI St. Luke's Health, and the Department of Pathology and Laboratory Medicine, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Aleix Ribas-Latre
- Center for Metabolic and Degenerative Diseases, Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Corrine Baumgartner
- Center for Metabolic and Degenerative Diseases, Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Kristin Eckel-Mahan
- Center for Metabolic and Degenerative Diseases, Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Heinrich Taegtmeyer
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX, USA.
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Massey JC, Seshadri V, Paul S, Mińczuk K, Molinos C, Li J, Kundu BK. Model Corrected Blood Input Function to Compute Cerebral FDG Uptake Rates From Dynamic Total-Body PET Images of Rats in vivo. Front Med (Lausanne) 2021; 8:618645. [PMID: 33898476 PMCID: PMC8058193 DOI: 10.3389/fmed.2021.618645] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Accepted: 02/15/2021] [Indexed: 12/17/2022] Open
Abstract
Recently, we developed a three-compartment dual-output model that incorporates spillover (SP) and partial volume (PV) corrections to simultaneously estimate the kinetic parameters and model-corrected blood input function (MCIF) from dynamic 2-[18F] fluoro-2-deoxy-D-glucose positron emission tomography (FDG PET) images of mouse heart in vivo. In this study, we further optimized this model and utilized the estimated MCIF to compute cerebral FDG uptake rates, Ki, from dynamic total-body FDG PET images of control Wistar–Kyoto (WKY) rats and compared to those derived from arterial blood sampling in vivo. Dynamic FDG PET scans of WKY rats (n = 5), fasted for 6 h, were performed using the Albira Si Trimodal PET/SPECT/CT imager for 60 min. Arterial blood samples were collected for the entire imaging duration and then fitted to a seven-parameter function. The 60-min list mode PET data, corrected for attenuation, scatter, randoms, and decay, were reconstructed into 23 time bins. A 15-parameter dual-output model with SP and PV corrections was optimized with two cost functions to compute MCIF. A four-parameter compartment model was then used to compute cerebral Ki. The computed area under the curve (AUC) and Ki were compared to that derived from arterial blood samples. Experimental and computed AUCs were 1,893.53 ± 195.39 kBq min/cc and 1,792.65 ± 155.84 kBq min/cc, respectively (p = 0.76). Bland–Altman analysis of experimental vs. computed Ki for 35 cerebral regions in WKY rats revealed a mean difference of 0.0029 min−1 (~13.5%). Direct (AUC) and indirect (Ki) comparisons of model computations with arterial blood sampling were performed in WKY rats. AUC and the downstream cerebral FDG uptake rates compared well with that obtained using arterial blood samples. Experimental vs. computed cerebral Ki for the four super regions including cerebellum, frontal cortex, hippocampus, and striatum indicated no significant differences.
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Affiliation(s)
- James C Massey
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Vikram Seshadri
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Soumen Paul
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Krzysztof Mińczuk
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States.,Department of Experimental Physiology and Pathophysiology, Medical University of Białystok, Białystok, Poland
| | - Cesar Molinos
- Preclinical Imaging Division, Bruker Biospin, Billerica, MA, United States
| | - Jie Li
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Bijoy K Kundu
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States.,Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, United States.,Cardiovascular Research Center, University of Virginia, Charlottesville, VA, United States
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10
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Sourdon J, Facchin C, Certain A, Viel T, Robin B, Lager F, Marchiol C, Balvay D, Yoganathan T, Favier J, Tharaux PL, Dhaun N, Renault G, Tavitian B. Sunitinib-induced cardiac hypertrophy and the endothelin axis. Am J Cancer Res 2021; 11:3830-3838. [PMID: 33664864 PMCID: PMC7914356 DOI: 10.7150/thno.49837] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 10/13/2020] [Indexed: 12/16/2022] Open
Abstract
Anti-angiogenics drugs in clinical use for cancer treatment induce cardiotoxic side effects. The endothelin axis is involved in hypertension and cardiac remodelling, and addition of an endothelin receptor antagonist to the anti-angiogenic sunitinib was shown to reduce cardiotoxicity of sunitinib in mice. Here, we explored further the antidote effect of the endothelin receptor antagonist macitentan in sunitinib-treated animals on cardiac remodeling. Methods: Tumor-bearing mice treated per os daily by sunitinib or vehicle were imaged before and after 1, 3 and 6 weeks of treatment by positron emission tomography using [18F]fluorodeoxyglucose and by echocardiography. Non-tumor-bearing animals were randomly assigned to be treated per os daily by vehicle or sunitinib or macitentan or sunitinib+macitentan, and imaged by echocardiography after 5 weeks. Hearts were harvested for histology and molecular analysis at the end of in vivo exploration. Results: Sunitinib treatment increases left ventricular mass and ejection fraction and induces cardiac fibrosis. Sunitinib also induces an early increase in cardiac uptake of [18F]fluorodeoxyglucose, which is significantly correlated with increased left ventricular mass at the end of treatment. Co-administration of macitentan prevents sunitinib-induced hypertension, increase in ejection fraction and cardiac fibrosis, but fails to prevent increase of the left ventricular mass. Conclusion: Early metabolic changes predict sunitinib-induced cardiac remodeling. Endothelin blockade can prevent some but not all cardiotoxic side-effects of sunitinib, in particular left ventricle hypertrophy that appears to be induced by sunitinib through an endothelin-independent mechanism.
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11
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Gropler RJ. Imaging Myocardial Metabolism. Mol Imaging 2021. [DOI: 10.1016/b978-0-12-816386-3.00083-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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12
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Bauckneht M, Pastorino F, Castellani P, Cossu V, Orengo AM, Piccioli P, Emionite L, Capitanio S, Yosifov N, Bruno S, Lazzarini E, Ponzoni M, Ameri P, Rubartelli A, Ravera S, Morbelli S, Sambuceti G, Marini C. Increased myocardial 18F-FDG uptake as a marker of Doxorubicin-induced oxidative stress. J Nucl Cardiol 2020; 27:2183-2194. [PMID: 30737636 DOI: 10.1007/s12350-019-01618-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 01/07/2019] [Indexed: 10/27/2022]
Abstract
BACKGROUND Oxidative stress and its interference on myocardial metabolism play a major role in Doxorubicin (DXR) cardiotoxic cascade. METHODS Mice models of neuroblastoma (NB) were treated with 5 mg DXR/kg, either free (Free-DXR) or encapsulated in untargeted (SL[DXR]) or in NB-targeting Stealth Liposomes (pep-SL[DXR] and TP-pep-SL[DXR]). Control mice received saline. FDG-PET was performed at baseline (PET1) and 7 days after therapy (PET2). At PET2 Troponin-I and NT-proBNP were assessed. Explanted hearts underwent biochemical, histological, and immunohistochemical analyses. Finally, FDG uptake and glucose consumption were simultaneously measured in cultured H9c2 in the presence/absence of Free-DXR (1 μM). RESULTS Free-DXR significantly enhanced the myocardial oxidative stress. Myocardial-SUV remained relatively stable in controls and mice treated with liposomal formulations, while it significantly increased at PET2 with respect to baseline in Free-DXR. At this timepoint, myocardial-SUV was directly correlated with both myocardial redox stress and hexose-6-phosphate-dehydrogenase (H6PD) enzymatic activity, which selectively sustain cellular anti-oxidant mechanisms. Intriguingly, in vitro, Free-DXR selectively increased FDG extraction fraction without altering the corresponding value for glucose. CONCLUSION The direct correlation between cardiac FDG uptake and oxidative stress indexes supports the potential role of FDG-PET as an early biomarker of DXR oxidative damage.
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Affiliation(s)
- Matteo Bauckneht
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Genoa, Italy.
- Nuclear Medicine, Department of Health Sciences (DISSAL), University of Genoa, Largo R. Benzi 10, 16132, Genoa, Italy.
| | - Fabio Pastorino
- Laboratory of Experimental Therapy in Oncology, Istituto Giannina Gaslini, Genoa, Italy
| | | | - Vanessa Cossu
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Anna Maria Orengo
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Patrizia Piccioli
- Cell Biology Unit, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Laura Emionite
- Animal Facility, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Selene Capitanio
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Nikola Yosifov
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Silvia Bruno
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
| | - Edoardo Lazzarini
- Cardiovascular Disease Unit, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Department of Internal Medicine & Centre of Excellence for Biomedical Research, University of Genoa, Genoa, Italy
| | - Mirco Ponzoni
- Laboratory of Experimental Therapy in Oncology, Istituto Giannina Gaslini, Genoa, Italy
| | - Pietro Ameri
- Cardiovascular Disease Unit, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Department of Internal Medicine & Centre of Excellence for Biomedical Research, University of Genoa, Genoa, Italy
| | - Anna Rubartelli
- Cell Biology Unit, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Silvia Ravera
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
| | - Silvia Morbelli
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
- Nuclear Medicine, Department of Health Sciences (DISSAL), University of Genoa, Largo R. Benzi 10, 16132, Genoa, Italy
| | - Gianmario Sambuceti
- Nuclear Medicine, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
- Nuclear Medicine, Department of Health Sciences (DISSAL), University of Genoa, Largo R. Benzi 10, 16132, Genoa, Italy
| | - Cecilia Marini
- Nuclear Medicine, Department of Health Sciences (DISSAL), University of Genoa, Largo R. Benzi 10, 16132, Genoa, Italy
- CNR Institute of Molecular Bioimaging and Physiology, Milan, Italy
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13
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Cibi DM, Bi-Lin KW, Shekeran SG, Sandireddy R, Tee N, Singh A, Wu Y, Srinivasan DK, Kovalik JP, Ghosh S, Seale P, Singh MK. Prdm16 Deficiency Leads to Age-Dependent Cardiac Hypertrophy, Adverse Remodeling, Mitochondrial Dysfunction, and Heart Failure. Cell Rep 2020; 33:108288. [PMID: 33086060 DOI: 10.1016/j.celrep.2020.108288] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 03/23/2020] [Accepted: 09/29/2020] [Indexed: 01/09/2023] Open
Abstract
Hypertrophic cardiomyopathy (HCM) is a well-established risk factor for cardiovascular mortality worldwide. Although hypertrophy is traditionally regarded as an adaptive response to physiological or pathological stress, prolonged hypertrophy can lead to heart failure. Here we demonstrate that Prdm16 is dispensable for cardiac development. However, it is required in the adult heart to preserve mitochondrial function and inhibit hypertrophy with advanced age. Cardiac-specific deletion of Prdm16 results in cardiac hypertrophy, excessive ventricular fibrosis, mitochondrial dysfunction, and impaired metabolic flexibility, leading to heart failure. We demonstrate that Prdm16 and euchromatic histone-lysine N-methyltransferase factors (Ehmts) act together to reduce expression of fetal genes reactivated in pathological hypertrophy by inhibiting the functions of the pro-hypertrophic transcription factor Myc. Although young Prdm16 knockout mice show normal cardiac function, they are predisposed to develop heart failure in response to metabolic stress. Our study demonstrates that Prdm16 protects the heart against age-dependent cardiac hypertrophy and heart failure.
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Affiliation(s)
- Dasan Mary Cibi
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore 169857
| | - Kathleen Wung Bi-Lin
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore 169857
| | - Shamini Guna Shekeran
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore 169857
| | - Reddemma Sandireddy
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore 169857
| | - Nicole Tee
- National Heart Research Institute Singapore, National Heart Center Singapore, Singapore 169609
| | - Anamika Singh
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore 169857
| | - Yajun Wu
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117594
| | - Dinesh Kumar Srinivasan
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117594
| | - Jean-Paul Kovalik
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore 169857
| | - Sujoy Ghosh
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore 169857
| | - Patrick Seale
- Institute for Diabetes, Obesity, and Metabolism, Department of Cell and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, Smilow Center for Translational Research, 3400 Civic Center Boulevard, Philadelphia, PA 19104, USA
| | - Manvendra K Singh
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School, Singapore 169857; National Heart Research Institute Singapore, National Heart Center Singapore, Singapore 169609.
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14
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Sampath S, Parimal AS, Huang W, Manigbas E, Gsell W, Chang MML, Qiu A, Jacobsen K, Evelhoch JL, Chin CL. Quantification of regional myocardial mean intracellular water lifetime: A nonhuman primate study in myocardial stress. NMR IN BIOMEDICINE 2020; 33:e4248. [PMID: 31977123 DOI: 10.1002/nbm.4248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 12/01/2019] [Accepted: 12/02/2019] [Indexed: 06/10/2023]
Abstract
Heart failure with preserved ejection fraction (HFpEF) is typically associated with early metabolic remodeling. Noninvasive imaging biomarkers that reflect these changes will be crucial in determining responses to early drug interventions in these patients. Mean intracellular water lifetime (τi ) has been shown to be partially inversely related to Na, K-ATPase transporter activity and may thus provide insight into the metabolic status in HFpEF patients. Here, we aim to perform regional quantification of τi using dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) in the nonhuman primate (NHP) heart and evaluate its region-specific variations under conditions of myocardial stress in the context of perturbed myocardial function. Cardiac stress was induced in seven naïve cynomolgus macaques using a dobutamine stepwise infusion protocol. All animals underwent 3 T cardiac dual-bolus DCE and tagging MRI experiments. The shutter-speed model was employed to quantify regional τi from the DCE-MR images. Additionally, τi values were correlated with myocardial strains. During cardiac stress, there was a significant decrease in global τi (192.9 ± 76.3 ms vs 321.6 ± 70 ms at rest, P < 0.05) in the left ventricle, together with an increase in global peak circumferential strain (-15.4% ± 2.7% vs -10.1% ± 2.9% at rest, P < 0.05). Specifically, slice-level analysis further revealed that a greater significant decrease in mean τi was observed in the apical region (ΔτI = 182.4 ms) compared with the basal (Δτi = 113.2 ms) and midventricular regions (Δτi = 108.4 ms). Regional analysis revealed that there was a greater significant decrease in mean τi in the anterior (Δτi = 243.9 ms) and antero-lateral (Δτi = 177.2 ms) regions. In the inferior and infero-septal regions, although a decrease in τi was observed, it was not significant. Whole heart regional quantification of τi is feasible using DCE-MRI. τi is sensitive to regional changes in metabolic state during cardiac stress, and its value correlates with strain.
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Affiliation(s)
| | | | - Wei Huang
- Advanced Imaging Research Center, Oregon Health and Science University, Portland, Oregon, United States
| | - Elaine Manigbas
- Imaging, Maccine Pte. Ltd., Singapore
- Comparative Medicine Imaging Facility, National University of Singapore, Singapore
| | - Willy Gsell
- Imaging, Maccine Pte. Ltd., Singapore
- Biomedical MRI, Department of Imaging and Pathology, Molecular Small Imaging Center, Leuven, Belgium
| | | | - Anqi Qiu
- Department of Biomedical Engineering, National University of Singapore, Singapore
| | | | - Jeffrey L Evelhoch
- Translational Biomarkers, MRL, Merck & Co., Inc, West Point, Pennsylvania
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15
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Li J, Kemp BA, Howell NL, Massey J, Mińczuk K, Huang Q, Chordia MD, Roy RJ, Patrie JT, Davogustto GE, Kramer CM, Epstein FH, Carey RM, Taegtmeyer H, Keller SR, Kundu BK. Metabolic Changes in Spontaneously Hypertensive Rat Hearts Precede Cardiac Dysfunction and Left Ventricular Hypertrophy. J Am Heart Assoc 2020; 8:e010926. [PMID: 30764689 PMCID: PMC6405673 DOI: 10.1161/jaha.118.010926] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Background Sustained pressure overload leads to changes in cardiac metabolism, function, and structure. Both time course and causal relationships between these changes are not fully understood. Therefore, we studied spontaneously hypertensive rats (SHR) during early hypertension development and compared them to control Wistar Kyoto rats. Methods and Results We serially evaluated myocardial glucose uptake rates (Ki) with dynamic 2‐[18F] fluoro‐2‐deoxy‐D‐glucose positron emission tomography, and ejection fraction and left ventricular mass to body weight ratios with cardiac magnetic resonance imaging in vivo, determined glucose uptake and oxidation rates in isolated perfused hearts, and analyzed metabolites, mammalian target of rapamycin activity and endoplasmic reticulum stress in dissected hearts. When compared with Wistar Kyoto rats, SHR demonstrated increased glucose uptake rates (Ki) in vivo, and reduced ejection fraction as early as 2 months of age when hypertension was established. Isolated perfused SHR hearts showed increased glucose uptake and oxidation rates starting at 1 month. Cardiac metabolite analysis at 2 months of age revealed elevated pyruvate, fatty acyl‐ and branched chain amino acid‐derived carnitines, oxidative stress, and inflammation. Mammalian target of rapamycin activity increased in SHR beginning at 2 months. Left ventricular mass to body weight ratios and endoplasmic reticulum stress were elevated in 5 month‐old SHR. Conclusions Thus, in a genetic hypertension model, chronic cardiac pressure overload promptly leads to increased myocardial glucose uptake and oxidation, and to metabolite abnormalities. These coincide with, or precede, cardiac dysfunction while left ventricular hypertrophy develops only later. Myocardial metabolic changes may thus serve as early diagnostic markers for hypertension‐induced left ventricular hypertrophy.
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Affiliation(s)
- Jie Li
- 1 Department of Radiology and Medical Imaging University of Virginia Charlottesville VA
| | - Brandon A Kemp
- 2 Division of Endocrinology and Metabolism Department of Medicine University of Virginia Charlottesville VA
| | - Nancy L Howell
- 2 Division of Endocrinology and Metabolism Department of Medicine University of Virginia Charlottesville VA
| | - James Massey
- 1 Department of Radiology and Medical Imaging University of Virginia Charlottesville VA.,3 Department of Biomedical Engineering University of Virginia Charlottesville VA
| | - Krzysztof Mińczuk
- 1 Department of Radiology and Medical Imaging University of Virginia Charlottesville VA
| | - Qiao Huang
- 1 Department of Radiology and Medical Imaging University of Virginia Charlottesville VA
| | - Mahendra D Chordia
- 1 Department of Radiology and Medical Imaging University of Virginia Charlottesville VA
| | - R Jack Roy
- 1 Department of Radiology and Medical Imaging University of Virginia Charlottesville VA
| | - James T Patrie
- 4 Department of Public Health Sciences University of Virginia Charlottesville VA
| | - Giovanni E Davogustto
- 5 McGovern Medical School University of Texas Health Science Center in Houston Houston TX
| | - Christopher M Kramer
- 6 Department of Cardiovascular Medicine University of Virginia Charlottesville VA
| | - Frederick H Epstein
- 3 Department of Biomedical Engineering University of Virginia Charlottesville VA
| | - Robert M Carey
- 2 Division of Endocrinology and Metabolism Department of Medicine University of Virginia Charlottesville VA
| | - Heinrich Taegtmeyer
- 5 McGovern Medical School University of Texas Health Science Center in Houston Houston TX
| | - Susanna R Keller
- 2 Division of Endocrinology and Metabolism Department of Medicine University of Virginia Charlottesville VA
| | - Bijoy K Kundu
- 1 Department of Radiology and Medical Imaging University of Virginia Charlottesville VA.,3 Department of Biomedical Engineering University of Virginia Charlottesville VA.,7 Cardiovascular Research Center University of Virginia Charlottesville VA
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16
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Pitoulis FG, Terracciano CM. Heart Plasticity in Response to Pressure- and Volume-Overload: A Review of Findings in Compensated and Decompensated Phenotypes. Front Physiol 2020; 11:92. [PMID: 32116796 PMCID: PMC7031419 DOI: 10.3389/fphys.2020.00092] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 01/27/2020] [Indexed: 12/20/2022] Open
Abstract
The adult human heart has an exceptional ability to alter its phenotype to adapt to changes in environmental demand. This response involves metabolic, mechanical, electrical, and structural alterations, and is known as cardiac plasticity. Understanding the drivers of cardiac plasticity is essential for development of therapeutic agents. This is particularly important in contemporary cardiology, which uses treatments with peripheral effects (e.g., on kidneys, adrenal glands). This review focuses on the effects of different hemodynamic loads on myocardial phenotype. We examine mechanical scenarios of pressure- and volume overload, from the initial insult, to compensated, and ultimately decompensated stage. We discuss how different hemodynamic conditions occur and are underlined by distinct phenotypic and molecular changes. We complete the review by exploring how current basic cardiac research should leverage available cardiac models to study mechanical load in its different presentations.
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17
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Barton GP, Macdonald EB, Goss KN, Eldridge MW, Fain SB. Measuring the link between cardiac mechanical function and metabolism during hyperpolarized 13C-pyruvate magnetic resonance experiments. Magn Reson Imaging 2020; 68:9-17. [PMID: 31978518 DOI: 10.1016/j.mri.2020.01.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 12/19/2019] [Accepted: 01/19/2020] [Indexed: 10/25/2022]
Abstract
PURPOSE The goal of this study was to develop a methodology to investigate the relationship between contractile function and hyperpolarized (HP) [1-13C]pyruvate metabolism in a small animal model. To achieve sufficient signal from HP 13C compounds, HP 13C MRS/MRSI has required relatively large infusion volumes relative to the total blood volume in small animal models, which may affect cardiac function. METHODS Eight female Sprague Dawley rats were imaged on a 4.7T scanner with a dual tuned 1H/13C volume coil. ECG and respiratory gated k-t spiral MRSI and an IDEAL based reconstruction to determine [1-13C]pyruvate metabolism in the myocardium. This was coupled with 1H cine MRI to determine ventricular volumes and mechanical function pre- and post-infusion of [1-13C]pyruvate. For comparison to the [1-13C]pyruvate experiments, three female Sprague Dawley rats were imaged with 1H cine MRI to determine myocardial function pre- and post-saline infusion. RESULTS We demonstrated significant changes in cardiac contractile function between pre- and post-infusion of [1-13C]pyruvate. Specifically, there was an increase in end-diastolic volume (EDV), stroke volume (SV), and ejection fraction (EF). Additionally, the ventricular vascular coupling ratio (VVCR) showed an improvement after [1-13C]pyruvate infusion, indicating increased systolic performance due to an increased arterial load. There was a moderate to strong relationship between the downstream metabolic conversion of pyruvate to bicarbonate and a strong relationship between the conversion of pyruvate to lactate and the cardiac mechanical function response. CONCLUSION The infusion of [1-13C]pyruvate resulted in demonstrable increases in contractile function which was related to pyruvate conversion to bicarbonate and lactate. The combined effects of the infusion volume and inotropic effects of pyruvate metabolism likely explains the augmentation in myocardial mechanical function seen in these experiments. Given the relationship between pyruvate metabolism and contractile function observed in this study, this methodological approach may be utilized to better understand cardiac metabolic and functional remodeling in heart disease.
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Affiliation(s)
| | | | - Kara N Goss
- Medicine University of Wisconsin, Madison, WI, USA; Pediatrics University of Wisconsin, Madison, WI, USA
| | - Marlowe W Eldridge
- Pediatrics University of Wisconsin, Madison, WI, USA; Biomedical Engineering, University of Wisconsin, Madison, WI, USA
| | - Sean B Fain
- Medical Physics, University of Wisconsin, Madison, WI, USA; Biomedical Engineering, University of Wisconsin, Madison, WI, USA; Radiology, University of Wisconsin, Madison, WI, USA.
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18
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Banerjee D, Datta Chaudhuri R, Niyogi S, Roy Chowdhuri S, Poddar Sarkar M, Chatterjee R, Chakrabarti P, Sarkar S. Metabolic impairment in response to early induction of C/EBPβ leads to compromised cardiac function during pathological hypertrophy. J Mol Cell Cardiol 2020; 139:148-163. [PMID: 31958467 DOI: 10.1016/j.yjmcc.2020.01.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 12/06/2019] [Accepted: 01/08/2020] [Indexed: 11/16/2022]
Abstract
Chronic pressure overload-induced left ventricular hypertrophy in heart is preceded by a metabolic perturbation that prefers glucose over lipid as substrate for energy requirement. Here, we establish C/EBPβ (CCAAT/enhancer-binding protein β) as an early marker of the metabolic derangement that triggers the imbalance in fatty acid (FA) oxidation and glucose uptake with increased lipid accumulation in cardiomyocytes during pathological hypertrophy, leading to contractile dysfunction and endoplasmic reticulum (ER) stress. This is the first study that shows that myocardium-targeted C/EBPβ knockdown prevents the impaired cardiac function during cardiac hypertrophy led by maladaptive metabolic response with persistent hypertrophic stimuli, whereas its targeted overexpression in control increases lipid accumulation significantly compared to control hearts. A new observation from this study was the dual and opposite transcriptional regulation of the alpha and gamma isoforms of Peroxisomal proliferator activated receptors (PPARα and PPARγ) by C/EBPβ in hypertrophied cardiomyocytes. Before the functional and structural remodeling sets in the diseased myocardium, C/EBPβ aggravates lipid accumulation with the aid of the increased FA uptake involving induced PPARγ expression and decreased fatty acid oxidation (FAO) by suppressing PPARα expression. Glucose uptake into cardiomyocytes was greatly increased by C/EBPβ via PPARα suppression. The activation of mammalian target of rapamycin complex-1 (mTORC1) during increased workload in presence of glucose as the only substrate was prevented by C/EBPβ knockdown, thereby abating contractile dysfunction in cardiomyocytes. Our study thus suggests that C/EBPβ may be considered as a novel cellular marker for deranged metabolic milieu before the heart pathologically remodels itself during hypertrophy.
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Affiliation(s)
- Durba Banerjee
- Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, West Bengal, India
| | - Ratul Datta Chaudhuri
- Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, West Bengal, India
| | - Sougata Niyogi
- Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Sumedha Roy Chowdhuri
- Department of Botany, Centre of Advanced Study, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, India
| | - Mousumi Poddar Sarkar
- Department of Botany, Centre of Advanced Study, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, India
| | - Raghunath Chatterjee
- Human Genetics Unit, Indian Statistical Institute, 203 B T Road, Kolkata 700108, India
| | - Partha Chakrabarti
- Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Sagartirtha Sarkar
- Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, West Bengal, India.
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19
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Barton GP, Vildberg L, Goss K, Aggarwal N, Eldridge M, McMillan AB. Simultaneous determination of dynamic cardiac metabolism and function using PET/MRI. J Nucl Cardiol 2019; 26:1946-1957. [PMID: 29717407 PMCID: PMC7851880 DOI: 10.1007/s12350-018-1287-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 04/13/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND Cardiac metabolic changes in heart disease precede overt contractile dysfunction. However, metabolism and function are not typically assessed together in clinical practice. The purpose of this study was to develop a cardiac positron emission tomography/magnetic resonance (PET/MR) stress test to assess the dynamic relationship between contractile function and metabolism in a preclinical model. METHODS Following an overnight fast, healthy pigs (45-50 kg) were anesthetized and mechanically ventilated. 18F-fluorodeoxyglucose (18F-FDG) solution was administered intravenously at a constant rate of 0.01 mL/s for 60 minutes. A cardiac PET/MR stress test was performed using normoxic gas (FIO2 = .209) and hypoxic gas (FIO2 = .12). Simultaneous cardiac imaging was performed on an integrated 3T PET/MR scanner. RESULTS Hypoxic stress induced a significant increase in heart rate, cardiac output, left ventricular (LV) ejection fraction (EF), and peak torsion. There was a significant decline in arterial SpO2, LV end-diastolic and end-systolic volumes in hypoxia. Increased LV systolic function was coupled with an increase in myocardial FDG uptake (Ki) during hypoxic stress. CONCLUSION PET/MR with continuous FDG infusion captures dynamic changes in both cardiac metabolism and contractile function. This technique warrants evaluation in human cardiac disease for assessment of subtle functional and metabolic abnormalities.
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Affiliation(s)
- Gregory P Barton
- Department of Pediatrics, UW School of Medicine and Public Health, University of Wisconsin-Madison, 600 Highland Ave. H6/551 CSC, Madison, WI, 53792, USA.
- Rankin Laboratory of Pulmonary Medicine, University of Wisconsin-Madison, Madison, USA.
| | - Lauren Vildberg
- Department of Pediatrics, UW School of Medicine and Public Health, University of Wisconsin-Madison, 600 Highland Ave. H6/551 CSC, Madison, WI, 53792, USA
- Rankin Laboratory of Pulmonary Medicine, University of Wisconsin-Madison, Madison, USA
| | - Kara Goss
- Department of Pediatrics, UW School of Medicine and Public Health, University of Wisconsin-Madison, 600 Highland Ave. H6/551 CSC, Madison, WI, 53792, USA
- Department of Medicine, University of Wisconsin-Madison, Madison, USA
- Rankin Laboratory of Pulmonary Medicine, University of Wisconsin-Madison, Madison, USA
| | - Niti Aggarwal
- Division of Cardiovascular Disease Department of Medicine, University of Wisconsin-Madison, Madison, USA
- Department of Radiology, University of Wisconsin-Madison, Madison, USA
| | - Marlowe Eldridge
- Department of Pediatrics, UW School of Medicine and Public Health, University of Wisconsin-Madison, 600 Highland Ave. H6/551 CSC, Madison, WI, 53792, USA
- Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, USA
- Rankin Laboratory of Pulmonary Medicine, University of Wisconsin-Madison, Madison, USA
| | - Alan B McMillan
- Department of Radiology, University of Wisconsin-Madison, Madison, USA
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20
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Glasenapp A, Derlin K, Wang Y, Bankstahl M, Meier M, Wollert KC, Bengel FM, Thackeray JT. Multimodality Imaging of Inflammation and Ventricular Remodeling in Pressure-Overload Heart Failure. J Nucl Med 2019; 61:590-596. [PMID: 31653713 DOI: 10.2967/jnumed.119.232488] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 09/25/2019] [Indexed: 12/28/2022] Open
Abstract
Inflammation contributes to ventricular remodeling after myocardial ischemia, but its role in nonischemic heart failure is poorly understood. Local tissue inflammation is difficult to assess serially during pathogenesis. Although 18F-FDG accumulates in inflammatory leukocytes and thus may identify inflammation in the myocardial microenvironment, it remains unclear whether this imaging technique can isolate diffuse leukocytes in pressure-overload heart failure. We aimed to evaluate whether inflammation with 18F-FDG can be serially imaged in the early stages of pressure-overload-induced heart failure and to compare the time course with functional impairment assessed by cardiac MRI. Methods: C57Bl6/N mice underwent transverse aortic constriction (TAC) (n = 22), sham surgery (n = 12), or coronary ligation as an inflammation-positive control (n = 5). MRI assessed ventricular geometry and contractile function at 2 and 8 d after TAC. Immunostaining identified the extent of inflammatory leukocyte infiltration early in pressure overload. 18F-FDG PET scans were acquired at 3 and 7 d after TAC, under ketamine-xylazine anesthesia to suppress cardiomyocyte glucose uptake. Results: Pressure overload evoked rapid left ventricular dilation compared with sham (end-systolic volume, day 2: 40.6 ± 10.2 μL vs. 23.8 ± 1.7 μL, P < 0.001). Contractile function was similarly impaired (ejection fraction, day 2: 40.9% ± 9.7% vs. 59.2% ± 4.4%, P < 0.001). The severity of contractile impairment was proportional to histology-defined myocardial macrophage density on day 8 (r = -0.669, P = 0.010). PET imaging identified significantly higher left ventricular 18F-FDG accumulation in TAC mice than in sham mice on day 3 (10.5 ± 4.1 percentage injected dose [%ID]/g vs. 3.8 ± 0.9 %ID/g, P < 0.001) and on day 7 (7.8 ± 3.7 %ID/g vs. 3.0 ± 0.8 %ID/g, P = 0.006), though the efficiency of cardiomyocyte suppression was variable among TAC mice. The 18F-FDG signal correlated with ejection fraction (r = -0.75, P = 0.01) and ventricular volume (r = 0.75, P < 0.01). Western immunoblotting demonstrated a 60% elevation of myocardial glucose transporter 4 expression in the left ventricle at 8 d after TAC, indicating altered glucose metabolism. Conclusion: TAC induces rapid changes in left ventricular geometry and contractile function, with a parallel modest infiltration of inflammatory macrophages. Metabolic remodeling overshadows inflammatory leukocyte signal using 18F-FDG PET imaging. More selective inflammatory tracers are requisite to identify the diffuse local inflammation in pressure overload.
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Affiliation(s)
- Aylina Glasenapp
- Department of Nuclear Medicine, Hannover Medical School, Hannover, Germany.,Department of Radiology, Hannover Medical School, Hannover, Germany
| | - Katja Derlin
- Department of Radiology, Hannover Medical School, Hannover, Germany
| | - Yong Wang
- Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany; and
| | - Marion Bankstahl
- Central Laboratory Animal Facility and Institute for Laboratory Animal Science, Hannover Medical School, Hannover, Germany
| | - Martin Meier
- Central Laboratory Animal Facility and Institute for Laboratory Animal Science, Hannover Medical School, Hannover, Germany
| | - Kai C Wollert
- Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany; and
| | - Frank M Bengel
- Department of Nuclear Medicine, Hannover Medical School, Hannover, Germany
| | - James T Thackeray
- Department of Nuclear Medicine, Hannover Medical School, Hannover, Germany
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21
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Iwashima S, Hayano S, Murakami Y, Tanaka A, Joko Y, Morikawa S, Ifuku M, Iso T, Takahashi K. Cardiac Function in Infants Born to Mothers With Gestational Diabetes - Estimation of Early Diastolic Intraventricular Pressure Differences. Circ Rep 2019; 1:378-388. [PMID: 33693166 PMCID: PMC7892812 DOI: 10.1253/circrep.cr-19-0062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background:
This study compared the myocardial performance of infants born to mothers with gestational diabetes mellitus (IGDM) and without GDM (controls) under the new GDM definitions. Methods and Results:
The subjects consisted of 36 IGDM and 39 control infants. GDM diagnosis was based on oral glucose tolerance test during pregnancy or the presence of diabetes prior to the current pregnancy. Between-group infant cardiac function was determined and compared using 2-D speckle tracking analysis, intraventricular pressure difference (IVPD) and IVP gradient (IVPG), using color M-mode Doppler imaging. IVPD and IVPG were higher in IGDM than in the controls, particularly the mid–apical IVPG. The global circumferential strain (GCS) and endocardial GCS were higher in IGDM than in controls. Increased maternal glycated hemoglobin was correlated with reduced transmural and epicardial GCS in the IGDM. Maternal maximum fasting blood sugar had a mild, positive correlation with IVPD and IVPG. Conclusions:
Ventricular sucking force, measured as the IVPD, IVPG, and endocardial GCS, were higher in IGDM than in the controls. A hyperglycemic environment during pregnancy leads to impaired cardiac performance in IGDM, compared with control infants. IGDM might have favorable systolic and diastolic cardiac performance due to cardiac metabolic adaptations occurring before poor glucose control causes impaired cardiac performance.
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Affiliation(s)
- Satoru Iwashima
- Department of Pediatric Cardiology, Chutoen General Medical Center Kakegawa Japan
| | - Satoshi Hayano
- Department of Pediatric Cardiology, Chutoen General Medical Center Kakegawa Japan
| | - Yusuke Murakami
- Department of Obstetrics and Gynecology, Chutoen General Medical Center Kakegawa Japan
| | - Aki Tanaka
- Department of Obstetrics and Gynecology, Chutoen General Medical Center Kakegawa Japan
| | - Yumiko Joko
- Department of Cardiology, Chutoen General Medical Center Kakegawa Japan
| | - Shuji Morikawa
- Department of Cardiology, Chutoen General Medical Center Kakegawa Japan
| | - Mayumi Ifuku
- Department of Pediatrics, Juntendo University Faculty of Medicine Tokyo Japan
| | - Takeshi Iso
- Department of Pediatrics, Juntendo University Faculty of Medicine Tokyo Japan
| | - Ken Takahashi
- Department of Pediatrics, Juntendo University Faculty of Medicine Tokyo Japan
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22
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Huang Q, Massey JC, Mińczuk K, Li J, Kundu BK. Non-invasive determination of blood input function to compute rate of myocardial glucose uptake from dynamic FDG PET images of rat heart in vivo: comparative study between the inferior vena cava and the left ventricular blood pool with spill over and partial volume corrections. Phys Med Biol 2019; 64:165010. [PMID: 31307015 DOI: 10.1088/1361-6560/ab3238] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The purpose of this work was to compute blood input function from the inferior vena cava (IVC) with partial volume (PV) corrections and compare to that obtained from the left ventricular blood pool (LVBP) with spill-over (SP) and PV corrections. These were then used to compute and validate rates of myocardial 2-deoxy-2-[18F]fluoro-D-glucose (FDG) uptake (Ki) from dynamic positron emission tomography (PET) images of rat hearts in vivo in comparison to that obtained from invasive arterial blood sampling. Whole body 60 min dynamic FDG PET/CT imaging of n = 8 control Wistar Kyoto (WKY) rats were performed using Albira trimodal PET/CT/SPECT scanner. Image derived blood input function (IDIF) obtained from IVC corrected for PV averaging (IVC-PV) and IDIF from the left ventricular blood pool (LVBP) with SP and PV corrections (LVBP-SP-PV) were computed. Next, computed Ki (indirect comparison) in a 5-parameter (using IVC-PV) and a 15-parameter (using LVBP-SP-PV) 3-compartment models in WKY rat hearts in vivo were compared to that obtained using arterial blood sampling reported in literature in control Spraque Dawley (SD) rats. Using IVC-PV in a three-compartment five-parameter model resulted in a ~46% deviation in the mean computed Ki compared to that obtained with LVBP-SP-PV in a three-compartment 15-parameter model with a ~57% deviation in the mean computed Ki. The mean computed Ki in WKY rat hearts using the above methods, however, did not differ significantly to that obtained from invasive arterial blood sampling in SD rat hearts (p = 0.91 for IVC-PV and p = 0.58 for LVBP-SP-PV). Hence, Ki obtained in WKY rat hearts with input curve from IVC (IVC-PV) in a dynamic FDG PET scan is comparatively more repetitive to that obtained from the LVBP (LVBP-SP-PV). Ki computed using both the methods, however, agree well with each other and that obtained using arterial blood sampling.
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Affiliation(s)
- Qiao Huang
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States of America. Equal contribution
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23
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Pinckard K, Baskin KK, Stanford KI. Effects of Exercise to Improve Cardiovascular Health. Front Cardiovasc Med 2019; 6:69. [PMID: 31214598 PMCID: PMC6557987 DOI: 10.3389/fcvm.2019.00069] [Citation(s) in RCA: 156] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 05/07/2019] [Indexed: 12/18/2022] Open
Abstract
Obesity is a complex disease that affects whole body metabolism and is associated with an increased risk of cardiovascular disease (CVD) and Type 2 diabetes (T2D). Physical exercise results in numerous health benefits and is an important tool to combat obesity and its co-morbidities, including cardiovascular disease. Exercise prevents both the onset and development of cardiovascular disease and is an important therapeutic tool to improve outcomes for patients with cardiovascular disease. Some benefits of exercise include enhanced mitochondrial function, restoration and improvement of vasculature, and the release of myokines from skeletal muscle that preserve or augment cardiovascular function. In this review we will discuss the mechanisms through which exercise promotes cardiovascular health.
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Affiliation(s)
| | | | - Kristin I. Stanford
- Department of Physiology and Cell Biology, Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH, United States
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24
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Molinos C, Sasser T, Salmon P, Gsell W, Viertl D, Massey JC, Mińczuk K, Li J, Kundu BK, Berr S, Correcher C, Bahadur A, Attarwala AA, Stark S, Junge S, Himmelreich U, Prior JO, Laperre K, Van Wyk S, Heidenreich M. Low-Dose Imaging in a New Preclinical Total-Body PET/CT Scanner. Front Med (Lausanne) 2019; 6:88. [PMID: 31131277 PMCID: PMC6509903 DOI: 10.3389/fmed.2019.00088] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 04/09/2019] [Indexed: 12/17/2022] Open
Abstract
Ionizing radiation constitutes a health risk to imaging scientists and study animals. Both PET and CT produce ionizing radiation. CT doses in pre-clinical in vivo imaging typically range from 50 to 1,000 mGy and biological effects in mice at this dose range have been previously described. [18F]FDG body doses in mice have been estimated to be in the range of 100 mGy for [18F]FDG. Yearly, the average whole body doses due to handling of activity by PET technologists are reported to be 3–8 mSv. A preclinical PET/CT system is presented with design features which make it suitable for small animal low-dose imaging. The CT subsystem uses a X-source power that is optimized for small animal imaging. The system design incorporates a spatial beam shaper coupled with a highly sensitive flat-panel detector and very fast acquisition (<10 s) which allows for whole body scans with doses as low as 3 mGy. The mouse total-body PET subsystem uses a detector architecture based on continuous crystals, coupled to SiPM arrays and a readout based in rows and columns. The PET field of view is 150 mm axial and 80 mm transaxial. The high solid-angle coverage of the sample and the use of continuous crystals achieve a sensitivity of 9% (NEMA) that can be leveraged for use of low tracer doses and/or performing rapid scans. The low-dose imaging capabilities of the total-body PET subsystem were tested with NEMA phantoms, in tumor models, a mouse bone metabolism scan and a rat heart dynamic scan. The CT imaging capabilities were tested in mice and in a low contrast phantom. The PET low-dose phantom and animal experiments provide evidence that image quality suitable for preclinical PET studies is achieved. Furthermore, CT image contrast using low dose scan settings was suitable as a reference for PET scans. Total-body mouse PET/CT studies could be completed with total doses of <10 mGy.
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Affiliation(s)
- Cesar Molinos
- Bruker BioSpin, Preclinical Imaging, Ettlingen, Germany
| | - Todd Sasser
- Bruker BioSpin, Preclinical Imaging, Ettlingen, Germany
| | - Phil Salmon
- Bruker BioSpin, Preclinical Imaging, Ettlingen, Germany
| | | | - David Viertl
- Department of Nuclear Medicine and Molecular Imaging, Lausanne University Hospital, Lausanne, Switzerland
| | - James C Massey
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Krzysztof Mińczuk
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Jie Li
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Bijoy K Kundu
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Stuart Berr
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | | | - Ali Bahadur
- Bruker BioSpin, Preclinical Imaging, Ettlingen, Germany
| | | | - Simon Stark
- Bruker BioSpin, Preclinical Imaging, Ettlingen, Germany
| | - Sven Junge
- Bruker BioSpin, Preclinical Imaging, Ettlingen, Germany
| | | | - John O Prior
- Department of Nuclear Medicine and Molecular Imaging, Lausanne University Hospital, Lausanne, Switzerland
| | - Kjell Laperre
- Bruker BioSpin, Preclinical Imaging, Ettlingen, Germany
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25
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Boutagy NE, Feher A, Alkhalil I, Umoh N, Sinusas AJ. Molecular Imaging of the Heart. Compr Physiol 2019; 9:477-533. [PMID: 30873600 DOI: 10.1002/cphy.c180007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Multimodality cardiovascular imaging is routinely used to assess cardiac function, structure, and physiological parameters to facilitate the diagnosis, characterization, and phenotyping of numerous cardiovascular diseases (CVD), as well as allows for risk stratification and guidance in medical therapy decision-making. Although useful, these imaging strategies are unable to assess the underlying cellular and molecular processes that modulate pathophysiological changes. Over the last decade, there have been great advancements in imaging instrumentation and technology that have been paralleled by breakthroughs in probe development and image analysis. These advancements have been merged with discoveries in cellular/molecular cardiovascular biology to burgeon the field of cardiovascular molecular imaging. Cardiovascular molecular imaging aims to noninvasively detect and characterize underlying disease processes to facilitate early diagnosis, improve prognostication, and guide targeted therapy across the continuum of CVD. The most-widely used approaches for preclinical and clinical molecular imaging include radiotracers that allow for high-sensitivity in vivo detection and quantification of molecular processes with single photon emission computed tomography and positron emission tomography. This review will describe multimodality molecular imaging instrumentation along with established and novel molecular imaging targets and probes. We will highlight how molecular imaging has provided valuable insights in determining the underlying fundamental biology of a wide variety of CVDs, including: myocardial infarction, cardiac arrhythmias, and nonischemic and ischemic heart failure with reduced and preserved ejection fraction. In addition, the potential of molecular imaging to assist in the characterization and risk stratification of systemic diseases, such as amyloidosis and sarcoidosis will be discussed. © 2019 American Physiological Society. Compr Physiol 9:477-533, 2019.
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Affiliation(s)
- Nabil E Boutagy
- Department of Medicine, Yale Translational Research Imaging Center, Yale University School of Medicine, Section of Cardiovascular Medicine, New Haven, Connecticut, USA
| | - Attila Feher
- Department of Medicine, Yale Translational Research Imaging Center, Yale University School of Medicine, Section of Cardiovascular Medicine, New Haven, Connecticut, USA
| | - Imran Alkhalil
- Department of Medicine, Yale Translational Research Imaging Center, Yale University School of Medicine, Section of Cardiovascular Medicine, New Haven, Connecticut, USA
| | - Nsini Umoh
- Department of Medicine, Yale Translational Research Imaging Center, Yale University School of Medicine, Section of Cardiovascular Medicine, New Haven, Connecticut, USA
| | - Albert J Sinusas
- Department of Medicine, Yale Translational Research Imaging Center, Yale University School of Medicine, Section of Cardiovascular Medicine, New Haven, Connecticut, USA.,Yale University School of Medicine, Department of Radiology and Biomedical Imaging, New Haven, Connecticut, USA
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26
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Abdurrachim D, Teo XQ, Woo CC, Chan WX, Lalic J, Lam CSP, Lee PTH. Empagliflozin reduces myocardial ketone utilization while preserving glucose utilization in diabetic hypertensive heart disease: A hyperpolarized 13 C magnetic resonance spectroscopy study. Diabetes Obes Metab 2019; 21:357-365. [PMID: 30225964 PMCID: PMC6587455 DOI: 10.1111/dom.13536] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 09/04/2018] [Accepted: 09/12/2018] [Indexed: 01/05/2023]
Abstract
AIM To investigate the effects of the sodium-glucose co-transporter-2 inhibitor empagliflozin on myocardial ketone body utilization in diabetic, obese rats with spontaneously hypertensive heart failure (SHHF), after 6 months of treatment. MATERIALS AND METHODS Myocardial ketone body utilization was measured in vivo real time using a novel ketone probe (hyperpolarized [3-13 C]acetoacetate) and magnetic resonance spectroscopy (MRS). Myocardial glucose utilization and cardiac function were also determined in vivo using hyperpolarized [1-13 C]pyruvate MRS and magnetic resonance imaging (MRI), respectively. Myocardial fatty acid uptake and liver ketogenesis were assessed via protein expression. RESULTS At baseline, myocardial ketone and glucose utilization were both higher in SHHF compared with control rats. Six months of empagliflozin treatment in SHHF rats was associated with less obesity, lower blood pressure, reduced blood glucose and insulin levels, and increased fasting blood β-hydroxybutyrate levels, as expected. Contrary to the hypothesis, myocardial ketone body utilization was lower in empagliflozin-treated SHHF rats, while glucose utilization and cardiac function were unaltered and hepatic congestion was reduced, compared with vehicle-treated SHHF rats. CONCLUSIONS In diabetic hypertensive heart disease, empagliflozin reduces afterload without altering myocardial function and glucose utilization in the face of falling blood glucose levels, but does not enhance myocardial ketone utilization despite increased circulating levels.
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Affiliation(s)
- Desiree Abdurrachim
- Singapore Bioimaging Consortium, Agency for Science, Technology and ResearchSingapore
| | - Xing Qi Teo
- Singapore Bioimaging Consortium, Agency for Science, Technology and ResearchSingapore
| | - Chern Chiuh Woo
- Singapore Bioimaging Consortium, Agency for Science, Technology and ResearchSingapore
| | - Wei Xin Chan
- Singapore Bioimaging Consortium, Agency for Science, Technology and ResearchSingapore
| | - Janise Lalic
- Singapore Bioimaging Consortium, Agency for Science, Technology and ResearchSingapore
| | - Carolyn S. P. Lam
- Singapore Bioimaging Consortium, Agency for Science, Technology and ResearchSingapore
- National Heart Centre Singapore and Duke‐National University of SingaporeSingapore
| | - Philip Teck Hock Lee
- Singapore Bioimaging Consortium, Agency for Science, Technology and ResearchSingapore
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27
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Todica A, Beetz NL, Günther L, Zacherl MJ, Grabmaier U, Huber B, Bartenstein P, Brunner S, Lehner S. Monitoring of Cardiac Remodeling in a Mouse Model of Pressure-Overload Left Ventricular Hypertrophy with [ 18F]FDG MicroPET. Mol Imaging Biol 2019; 20:268-274. [PMID: 28852941 DOI: 10.1007/s11307-017-1114-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
PURPOSE This study aims to analyze the left ventricular function parameters, scar load, and hypertrophy in a mouse model of pressure-overload left ventricular (LV) hypertrophy over the course of 8 weeks using 2-deoxy-2-[18F]fluoro-D-glucose ([18F]FDG) micro-positron emission tomography (microPET) imaging. PROCEDURES LV hypertrophy was induced in C57BL/6 mice by transverse aortic constriction (TAC). Myocardial hypertrophy developed after 2-4 weeks. ECG-gated microPET scans with [18F]FDG were performed 4 and 8 weeks after surgery. The extent of fibrosis was measured by histopathologic analysis. LV function parameters and scar load were calculated using QGS®/QPS®. LV metabolic volume (LVMV) and percentage injected dose per gram were estimated by threshold-based analysis. RESULTS The fibrotic tissue volume increased significantly from 4 to 8 weeks after TAC (1.67 vs. 3.91 mm3; P = 0.044). There was a significant increase of the EDV (4 weeks: 54 ± 15 μl, 8 weeks: 79 ± 32 μl, P < 0.01) and LVMV (4 weeks: 222 ± 24 μl, 8 weeks: 276 ± 52 μl, P < 0.01) as well as a significant decrease of the LVEF (4 weeks: 56 ± 17 %, 8 weeks: 44 ± 20 %, P < 0.01). The increase of LVMV had a high predictive value regarding the amount of ex vivo measured fibrotic tissue (R = 0.905, P < 0.001). The myocardial metabolic defects increased within 4 weeks (P = 0.055) but only moderately correlated with the fibrosis volume (R = 0.502, P = 0.021). The increase in end-diastolic volume showed a positive correlation with the fibrosis at 8 weeks (R = 0.763, P = 0.017). CONCLUSIONS [18F]FDG-PET is applicable for serial in vivo monitoring of the TAC mouse model. Myocardial hypertrophy, the dilation of the left ventricle, and the decrease in LVEF could be reliably quantified over time, as well as the developing localized scar. The increase in volume over time is predictive of a high fibrosis load.
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Affiliation(s)
- Andrei Todica
- Department of Nuclear Medicine, University Hospital, LMU Munich, Munich, Germany.
| | - Nick L Beetz
- Medical Department I-Cardiology, University Hospital, LMU Munich, Munich, Germany
| | - Lisa Günther
- Department of Nuclear Medicine, University Hospital, LMU Munich, Munich, Germany
| | - Mathias J Zacherl
- Department of Nuclear Medicine, University Hospital, LMU Munich, Munich, Germany
| | - Ulrich Grabmaier
- Medical Department I-Cardiology, University Hospital, LMU Munich, Munich, Germany
| | - Bruno Huber
- Medical Department I-Cardiology, University Hospital, LMU Munich, Munich, Germany
| | - Peter Bartenstein
- Department of Nuclear Medicine, University Hospital, LMU Munich, Munich, Germany
| | - Stefan Brunner
- Medical Department I-Cardiology, University Hospital, LMU Munich, Munich, Germany
| | - Sebastian Lehner
- Department of Nuclear Medicine, University Hospital, LMU Munich, Munich, Germany.,Ambulatory Healthcare Center Dr. Neumaier & Colleagues, Radiology, Nuclear Medicine, Radiation Therapy, Regensburg, Germany
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28
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Abdurrachim D, Nabben M, Hoerr V, Kuhlmann MT, Bovenkamp P, Ciapaite J, Geraets IME, Coumans W, Luiken JJFP, Glatz JFC, Schäfers M, Nicolay K, Faber C, Hermann S, Prompers JJ. Diabetic db/db mice do not develop heart failure upon pressure overload: a longitudinal in vivo PET, MRI, and MRS study on cardiac metabolic, structural, and functional adaptations. Cardiovasc Res 2018; 113:1148-1160. [PMID: 28549111 DOI: 10.1093/cvr/cvx100] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 05/23/2017] [Indexed: 12/11/2022] Open
Abstract
Aims Heart failure is associated with altered myocardial substrate metabolism and impaired cardiac energetics. Comorbidities like diabetes may influence the metabolic adaptations during heart failure development. We quantified to what extent changes in substrate preference, lipid accumulation, and energy status predict the longitudinal development of hypertrophy and failure in the non-diabetic and the diabetic heart. Methods and results Transverse aortic constriction (TAC) was performed in non-diabetic (db/+) and diabetic (db/db) mice to induce pressure overload. Magnetic resonance imaging, 31P magnetic resonance spectroscopy (MRS), 1H MRS, and 18F-fluorodeoxyglucose-positron emission tomography (PET) were applied to measure cardiac function, energy status, lipid content, and glucose uptake, respectively. In vivo measurements were complemented with ex vivo techniques of high-resolution respirometry, proteomics, and western blotting to elucidate the underlying molecular pathways. In non-diabetic mice, TAC induced progressive cardiac hypertrophy and dysfunction, which correlated with increased protein kinase D-1 (PKD1) phosphorylation and increased glucose uptake. These changes in glucose utilization preceded a reduction in cardiac energy status. At baseline, compared with non-diabetic mice, diabetic mice showed normal cardiac function, higher lipid content and mitochondrial capacity for fatty acid oxidation, and lower PKD1 phosphorylation, glucose uptake, and energetics. Interestingly, TAC affected cardiac function only mildly in diabetic mice, which was accompanied by normalization of phosphorylated PKD1, glucose uptake, and cardiac energy status. Conclusion The cardiac metabolic adaptations in diabetic mice seem to prevent the heart from failing upon pressure overload, suggesting that restoring the balance between glucose and fatty acid utilization is beneficial for cardiac function.
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Affiliation(s)
- Desiree Abdurrachim
- Department of Biomedical Engineering, Biomedical NMR, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands
| | - Miranda Nabben
- Department of Biomedical Engineering, Biomedical NMR, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands.,Department of Genetics and Cell Biology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Verena Hoerr
- Department of Clinical Radiology, University Hospital of Münster, Münster, Germany.,Institute of Medical Microbiology, Jena University Hospital, Jena, Germany
| | | | - Philipp Bovenkamp
- Department of Clinical Radiology, University Hospital of Münster, Münster, Germany
| | - Jolita Ciapaite
- Department of Pediatrics and Systems Biology Center for Energy Metabolism and Ageing, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Ilvy M E Geraets
- Department of Genetics and Cell Biology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Will Coumans
- Department of Genetics and Cell Biology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Joost J F P Luiken
- Department of Genetics and Cell Biology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Jan F C Glatz
- Department of Genetics and Cell Biology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Michael Schäfers
- European Institute for Molecular Imaging-EIMI, Münster, Germany.,Cells-in-Motion Cluster of Excellence, University of Münster, Münster, Germany.,Department of Nuclear Medicine, University of Münster, Münster, Germany
| | - Klaas Nicolay
- Department of Biomedical Engineering, Biomedical NMR, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands
| | - Cornelius Faber
- Department of Clinical Radiology, University Hospital of Münster, Münster, Germany
| | - Sven Hermann
- European Institute for Molecular Imaging-EIMI, Münster, Germany.,Cells-in-Motion Cluster of Excellence, University of Münster, Münster, Germany
| | - Jeanine J Prompers
- Department of Biomedical Engineering, Biomedical NMR, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands
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29
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Li Y, Kundu BK. An improved optimization algorithm of the three-compartment model with spillover and partial volume corrections for dynamic FDG PET images of small animal hearts in vivo. Phys Med Biol 2018; 63:055003. [PMID: 29480159 DOI: 10.1088/1361-6560/aaac02] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The three-compartment model with spillover (SP) and partial volume (PV) corrections has been widely used for noninvasive kinetic parameter studies of dynamic 2-[18F] fluoro-2deoxy-D-glucose (FDG) positron emission tomography images of small animal hearts in vivo. However, the approach still suffers from estimation uncertainty or slow convergence caused by the commonly used optimization algorithms. The aim of this study was to develop an improved optimization algorithm with better estimation performance. Femoral artery blood samples, image-derived input functions from heart ventricles and myocardial time-activity curves (TACs) were derived from data on 16 C57BL/6 mice obtained from the UCLA Mouse Quantitation Program. Parametric equations of the average myocardium and the blood pool TACs with SP and PV corrections in a three-compartment tracer kinetic model were formulated. A hybrid method integrating artificial immune-system and interior-reflective Newton methods were developed to solve the equations. Two penalty functions and one late time-point tail vein blood sample were used to constrain the objective function. The estimation accuracy of the method was validated by comparing results with experimental values using the errors in the areas under curves (AUCs) of the model corrected input function (MCIF) and the 18F-FDG influx constant K i . Moreover, the elapsed time was used to measure the convergence speed. The overall AUC error of MCIF for the 16 mice averaged -1.4 ± 8.2%, with correlation coefficients of 0.9706. Similar results can be seen in the overall K i error percentage, which was 0.4 ± 5.8% with a correlation coefficient of 0.9912. The t-test P value for both showed no significant difference. The mean and standard deviation of the MCIF AUC and K i percentage errors have lower values compared to the previously published methods. The computation time of the hybrid method is also several times lower than using just a stochastic algorithm. The proposed method significantly improved the model estimation performance in terms of the accuracy of the MCIF and K i , as well as the convergence speed.
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Affiliation(s)
- Yinlin Li
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA 22908, United States of America
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30
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Tan WS, Mullins TP, Flint M, Walton SL, Bielefeldt-Ohmann H, Carter DA, Gandhi MR, McDonald HR, Li J, Moritz KM, Reichelt ME, Gallo LA. Modeling heart failure risk in diabetes and kidney disease: limitations and potential applications of transverse aortic constriction in high-fat-fed mice. Am J Physiol Regul Integr Comp Physiol 2018; 314:R858-R869. [PMID: 29443547 DOI: 10.1152/ajpregu.00357.2017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
There is an increased incidence of heart failure in individuals with diabetes mellitus (DM). The coexistence of kidney disease in DM exacerbates the cardiovascular prognosis. Researchers have attempted to combine the critical features of heart failure, using transverse aortic constriction, with DM in mice, but variable findings have been reported. Furthermore, kidney outcomes have not been assessed in this setting; thus its utility as a model of heart failure in DM and kidney disease is unknown. We generated a mouse model of obesity, hyperglycemia, and mild kidney pathology by feeding male C57BL/6J mice a high-fat diet (HFD). Cardiac pressure overload was surgically induced using transverse aortic constriction (TAC). Normal diet (ND) and sham controls were included. Heart failure risk factors were evident at 8-wk post-TAC, including increased left ventricular mass (+49% in ND and +35% in HFD), cardiomyocyte hypertrophy (+40% in ND and +28% in HFD), and interstitial and perivascular fibrosis (Masson's trichrome and picrosirius red positivity). High-fat feeding did not exacerbate the TAC-induced cardiac outcomes. At 11 wk post-TAC in a separate mouse cohort, echocardiography revealed reduced left ventricular size and increased left ventricular wall thickness, the latter being evident in ND mice only. Systolic function was preserved in the TAC mice and was similar between ND and HFD. Thus combined high-fat feeding and TAC in mice did not model the increased incidence of heart failure in DM patients. This model, however, may mimic the better cardiovascular prognosis seen in overweight and obese heart failure patients.
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Affiliation(s)
- Wei Sheng Tan
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia
| | - Thomas P Mullins
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia
| | - Melanie Flint
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia
| | - Sarah L Walton
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia
| | | | - David A Carter
- Queensland Brain Institute, The University of Queensland , St. Lucia , Australia
| | - Meera R Gandhi
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia.,Mater Research Institute-University of Queensland, Translational Research Institute, Woolloongabba, Australia
| | - Hayley R McDonald
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia
| | - Joan Li
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , St. Lucia , Australia
| | - Karen M Moritz
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia
| | - Melissa E Reichelt
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia
| | - Linda A Gallo
- School of Biomedical Sciences, The University of Queensland , St. Lucia , Australia.,Mater Research Institute-University of Queensland, Translational Research Institute, Woolloongabba, Australia
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31
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Angelini A, Pi X, Xie L. Dioxygen and Metabolism; Dangerous Liaisons in Cardiac Function and Disease. Front Physiol 2017; 8:1044. [PMID: 29311974 PMCID: PMC5732914 DOI: 10.3389/fphys.2017.01044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 11/29/2017] [Indexed: 12/19/2022] Open
Abstract
The heart must consume a significant amount of energy to sustain its contractile activity. Although the fuel demands are huge, the stock remains very low. Thus, in order to supply its daily needs, the heart must have amazing adaptive abilities, which are dependent on dioxygen availability. However, in myriad cardiovascular diseases, “fuel” depletion and hypoxia are common features, leading cardiomyocytes to favor low-dioxygen-consuming glycolysis rather than oxidation of fatty acids. This metabolic switch makes it challenging to distinguish causes from consequences in cardiac pathologies. Finally, despite the progress achieved in the past few decades, medical treatments have not improved substantially, either. In such a situation, it seems clear that much remains to be learned about cardiac diseases. Therefore, in this review, we will discuss how reconciling dioxygen availability and cardiac metabolic adaptations may contribute to develop full and innovative strategies from bench to bedside.
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Affiliation(s)
- Aude Angelini
- Department of Medicine-Athero and Lipo, Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, United States
| | - Xinchun Pi
- Department of Medicine-Athero and Lipo, Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, United States
| | - Liang Xie
- Department of Medicine-Athero and Lipo, Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, United States
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32
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Ko KY, Wu YW, Liu CW, Cheng MF, Yen RF, Yang WS. Longitudinal evaluation of myocardial glucose metabolism and contractile function in obese type 2 diabetic db/db mice using small-animal dynamic 18F-FDG PET and echocardiography. Oncotarget 2017; 8:87795-87808. [PMID: 29152121 PMCID: PMC5675673 DOI: 10.18632/oncotarget.21202] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 08/17/2017] [Indexed: 02/02/2023] Open
Abstract
The aim was to evaluate sequential changes of myocardial glucose utilization and LV systolic function in db/db mice. Eight db/db and eight wild-type mice underwent plasma substrate analysis and dynamic 18F-FDG PET at week 8 (W8), W10, W12, W14, and W16. 18F-FDG uptake constant Ki and the rate of myocardial glucose uptake (MRGlu) were derived via Patlak graphic analysis. Another 8 db/db and 8 wild-type mice received echocardiography at W8, W12, and W16 and LV structure and function were measured. The db/db mice showed increased weights and glucose levels as they aged. The index of homeostasis model assessment-estimated insulin resistance, insulin, and free fatty acid concentrations were higher in db/db mice compared with wild-type. MRGlu of db/db mice across all time points was markedly higher than that of wild-type. An age-dependent elevation of MRGlu was observed in db/db mice. Ki and MRGlu of db/db mice showed negative correlation with triglyceride levels. When two groups were pooled together, Ki and MRGlu were significantly proportional to glucose levels. No significant difference in LV structure and function was noted between db/db and control mice. In conclusion, we demonstrated altered myocardial glucose utilization preceding the onset of LV systolic dysfunction in db/db mice.
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Affiliation(s)
- Kuan-Yin Ko
- Department of Nuclear Medicine, National Taiwan University Hospital, Yunlin Branch, Yunlin County, Taiwan.,Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University, College of Medicine, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yen-Wen Wu
- Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University, College of Medicine, Taipei, Taiwan.,Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University, College of Medicine, Taipei, Taiwan.,National Yang-Ming University School of Medicine, Taipei, Taiwan.,Cardiology Division of Cardiovascular Medical Center, Far Eastern Memorial Hospital, New Taipei City, Taiwan.,Department of Nuclear Medicine, Far Eastern Memorial Hospital, New Taipei City, Taiwan
| | - Cheng-Wei Liu
- Cardiology Division of Cardiovascular Medical Center, Far Eastern Memorial Hospital, New Taipei City, Taiwan.,Department of Internal Medicine, Tri-Service General Hospital, Songshan Branch, National Defense Medical Center, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Mei-Fang Cheng
- Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University, College of Medicine, Taipei, Taiwan.,Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University, Taipei, Taiwan
| | - Ruoh-Fang Yen
- Department of Nuclear Medicine, National Taiwan University Hospital and National Taiwan University, College of Medicine, Taipei, Taiwan
| | - Wei-Shiung Yang
- Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University, College of Medicine, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.,Department of Medicine and Graduate Institute of Medical Genomics & Proteomics, College of Medicine, National Taiwan University, Taipei, Taiwan.,R & D Branch Office, College of Medicine, National Taiwan University, Taipei, Taiwan
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33
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Sourdon J, Lager F, Viel T, Balvay D, Moorhouse R, Bennana E, Renault G, Tharaux PL, Dhaun N, Tavitian B. Cardiac Metabolic Deregulation Induced by the Tyrosine Kinase Receptor Inhibitor Sunitinib is rescued by Endothelin Receptor Antagonism. Theranostics 2017; 7:2757-2774. [PMID: 28824714 PMCID: PMC5562214 DOI: 10.7150/thno.19551] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 03/31/2017] [Indexed: 02/06/2023] Open
Abstract
The growing field of cardio-oncology addresses the side effects of cancer treatment on the cardiovascular system. Here, we explored the cardiotoxicity of the antiangiogenic therapy, sunitinib, in the mouse heart from a diagnostic and therapeutic perspective. We showed that sunitinib induces an anaerobic switch of cellular metabolism within the myocardium which is associated with the development of myocardial fibrosis and reduced left ventricular ejection fraction as demonstrated by echocardiography. The capacity of positron emission tomography with [18F]fluorodeoxyglucose to detect the changes in cardiac metabolism caused by sunitinib was dependent on fasting status and duration of treatment. Pan proteomic analysis in the myocardium showed that sunitinib induced (i) an early metabolic switch with enhanced glycolysis and reduced oxidative phosphorylation, and (ii) a metabolic failure to use glucose as energy substrate, similar to the insulin resistance found in type 2 diabetes. Co-administration of the endothelin receptor antagonist, macitentan, to sunitinib-treated animals prevented both metabolic defects, restored glucose uptake and cardiac function, and prevented myocardial fibrosis. These results support the endothelin system in mediating the cardiotoxic effects of sunitinib and endothelin receptor antagonism as a potential therapeutic approach to prevent cardiotoxicity. Furthermore, metabolic and functional imaging can monitor the cardiotoxic effects and the benefits of endothelin antagonism in a theranostic approach.
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Affiliation(s)
- Joevin Sourdon
- Paris Cardiovascular Research Center (PARCC); INSERM UMR970; Université Paris Descartes; Paris, France
| | - Franck Lager
- Institut Cochin, Université Paris Descartes, INSERM U1016, Paris 75014, France
| | - Thomas Viel
- Paris Cardiovascular Research Center (PARCC); INSERM UMR970; Université Paris Descartes; Paris, France
| | - Daniel Balvay
- Paris Cardiovascular Research Center (PARCC); INSERM UMR970; Université Paris Descartes; Paris, France
| | - Rebecca Moorhouse
- University/British Heart Foundation Centre for Cardiovascular Science, Queen's Medical Research Institute, Edinburgh, United Kingdom
| | - Evangeline Bennana
- Institut Cochin, Université Paris Descartes, INSERM U1016, Paris 75014, France
- 3P5 proteomics facility, Université Paris Descartes, Université Sorbonne Paris Cité, Paris, France
| | - Gilles Renault
- Institut Cochin, Université Paris Descartes, INSERM U1016, Paris 75014, France
| | - Pierre-Louis Tharaux
- Paris Cardiovascular Research Center (PARCC); INSERM UMR970; Université Paris Descartes; Paris, France
| | - Neeraj Dhaun
- University/British Heart Foundation Centre of Research Excellence, The Queen's Medical Research Institute, University of Edinburgh, United Kingdom
| | - Bertrand Tavitian
- Paris Cardiovascular Research Center (PARCC); INSERM UMR970; Université Paris Descartes; Paris, France
- Service de Radiologie, Hôpital Européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
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34
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O’Farrell AC, Evans R, Silvola JMU, Miller IS, Conroy E, Hector S, Cary M, Murray DW, Jarzabek MA, Maratha A, Alamanou M, Udupi GM, Shiels L, Pallaud C, Saraste A, Liljenbäck H, Jauhiainen M, Oikonen V, Ducret A, Cutler P, McAuliffe FM, Rousseau JA, Lecomte R, Gascon S, Arany Z, Ky B, Force T, Knuuti J, Gallagher WM, Roivainen A, Byrne AT. A Novel Positron Emission Tomography (PET) Approach to Monitor Cardiac Metabolic Pathway Remodeling in Response to Sunitinib Malate. PLoS One 2017; 12:e0169964. [PMID: 28129334 PMCID: PMC5271313 DOI: 10.1371/journal.pone.0169964] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 12/25/2016] [Indexed: 01/17/2023] Open
Abstract
Sunitinib is a tyrosine kinase inhibitor approved for the treatment of multiple solid tumors. However, cardiotoxicity is of increasing concern, with a need to develop rational mechanism driven approaches for the early detection of cardiac dysfunction. We sought to interrogate changes in cardiac energy substrate usage during sunitinib treatment, hypothesising that these changes could represent a strategy for the early detection of cardiotoxicity. Balb/CJ mice or Sprague-Dawley rats were treated orally for 4 weeks with 40 or 20 mg/kg/day sunitinib. Cardiac positron emission tomography (PET) was implemented to investigate alterations in myocardial glucose and oxidative metabolism. Following treatment, blood pressure increased, and left ventricular ejection fraction decreased. Cardiac [18F]-fluorodeoxyglucose (FDG)-PET revealed increased glucose uptake after 48 hours. [11C]Acetate-PET showed decreased myocardial perfusion following treatment. Electron microscopy revealed significant lipid accumulation in the myocardium. Proteomic analyses indicated that oxidative metabolism, fatty acid β-oxidation and mitochondrial dysfunction were among the top myocardial signalling pathways perturbed. Sunitinib treatment results in an increased reliance on glycolysis, increased myocardial lipid deposition and perturbed mitochondrial function, indicative of a fundamental energy crisis resulting in compromised myocardial energy metabolism and function. Our findings suggest that a cardiac PET strategy may represent a rational approach to non-invasively monitor metabolic pathway remodeling following sunitinib treatment.
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Affiliation(s)
- Alice C. O’Farrell
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Rhys Evans
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Johanna M. U. Silvola
- Turku PET Centre, Turku University Hospital and Åbo Akademi University, Turku, Finland
| | - Ian S. Miller
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Emer Conroy
- UCD School of Biomolecular and Biomedical Science, UCD Conway Institute, University College Dublin, Belfield, Dublin, Ireland
| | - Suzanne Hector
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
- Roche Innovation Center Basel, F Hoffman La Roche, Basel, Switzerland
| | | | - David W. Murray
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
- Oncomark Ltd, Dublin, Ireland
| | - Monika A. Jarzabek
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
- Roche Innovation Center Basel, F Hoffman La Roche, Basel, Switzerland
| | | | | | | | - Liam Shiels
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Celine Pallaud
- Roche Innovation Center Basel, F Hoffman La Roche, Basel, Switzerland
| | - Antti Saraste
- Turku PET Centre, Turku University Hospital and Åbo Akademi University, Turku, Finland
- Heart Center, Turku University Hospital and Åbo Akademi University, Turku, Finland
| | - Heidi Liljenbäck
- Turku PET Centre, Turku University Hospital and Åbo Akademi University, Turku, Finland
| | - Matti Jauhiainen
- Public Health Genomics Unit, National Institute for Health and Welfare, Helsinki, Finland
| | - Vesa Oikonen
- Turku PET Centre, Turku University Hospital and Åbo Akademi University, Turku, Finland
| | - Axel Ducret
- Roche Innovation Center Basel, F Hoffman La Roche, Basel, Switzerland
| | - Paul Cutler
- Roche Innovation Center Basel, F Hoffman La Roche, Basel, Switzerland
| | - Fionnuala M. McAuliffe
- UCD Obstetrics & Gynaecology, School of Medicine, University College, Dublin, National Maternity Hospital, Dublin, Ireland
| | | | | | | | - Zoltan Arany
- Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, United States of America
| | - Bonnie Ky
- Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, United States of America
| | - Thomas Force
- Vanderbilt University School of Medicine, Nashville, United States of America
| | - Juhani Knuuti
- Turku PET Centre, Turku University Hospital and Åbo Akademi University, Turku, Finland
| | - William M. Gallagher
- UCD School of Biomolecular and Biomedical Science, UCD Conway Institute, University College Dublin, Belfield, Dublin, Ireland
- Oncomark Ltd, Dublin, Ireland
| | - Anne Roivainen
- Turku PET Centre, Turku University Hospital and Åbo Akademi University, Turku, Finland
- Turku Center for Disease Modeling, University of Turku, Turku, Finland
| | - Annette T. Byrne
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin, Ireland
- * E-mail:
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Taegtmeyer H, Young ME, Lopaschuk GD, Abel ED, Brunengraber H, Darley-Usmar V, Des Rosiers C, Gerszten R, Glatz JF, Griffin JL, Gropler RJ, Holzhuetter HG, Kizer JR, Lewandowski ED, Malloy CR, Neubauer S, Peterson LR, Portman MA, Recchia FA, Van Eyk JE, Wang TJ. Assessing Cardiac Metabolism: A Scientific Statement From the American Heart Association. Circ Res 2016; 118:1659-701. [PMID: 27012580 DOI: 10.1161/res.0000000000000097] [Citation(s) in RCA: 185] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In a complex system of interrelated reactions, the heart converts chemical energy to mechanical energy. Energy transfer is achieved through coordinated activation of enzymes, ion channels, and contractile elements, as well as structural and membrane proteins. The heart's needs for energy are difficult to overestimate. At a time when the cardiovascular research community is discovering a plethora of new molecular methods to assess cardiac metabolism, the methods remain scattered in the literature. The present statement on "Assessing Cardiac Metabolism" seeks to provide a collective and curated resource on methods and models used to investigate established and emerging aspects of cardiac metabolism. Some of those methods are refinements of classic biochemical tools, whereas most others are recent additions from the powerful tools of molecular biology. The aim of this statement is to be useful to many and to do justice to a dynamic field of great complexity.
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36
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Pascual F, Coleman RA. Fuel availability and fate in cardiac metabolism: A tale of two substrates. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:1425-33. [PMID: 26993579 DOI: 10.1016/j.bbalip.2016.03.014] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 03/10/2016] [Accepted: 03/11/2016] [Indexed: 12/12/2022]
Abstract
The heart's extraordinary metabolic flexibility allows it to adapt to normal changes in physiology in order to preserve its function. Alterations in the metabolic profile of the heart have also been attributed to pathological conditions such as ischemia and hypertrophy; however, research during the past decade has established that cardiac metabolic adaptations can precede the onset of pathologies. It is therefore critical to understand how changes in cardiac substrate availability and use trigger events that ultimately result in heart dysfunction. This review examines the mechanisms by which the heart obtains fuels from the circulation or from mobilization of intracellular stores. We next describe experimental models that exhibit either an increase in glucose use or a decrease in FA oxidation, and how these aberrant conditions affect cardiac metabolism and function. Finally, we highlight the importance of alternative, relatively under-investigated strategies for the treatment of heart failure. This article is part of a Special Issue entitled: Heart Lipid Metabolism edited by G.D. Lopaschuk.
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Affiliation(s)
- Florencia Pascual
- Department of Nutrition, University of North Carolina at Chapel Hill, 27599, USA.
| | - Rosalind A Coleman
- Department of Nutrition, University of North Carolina at Chapel Hill, 27599, USA.
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37
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An X, Wang J, Li H, Lu Z, Bai Y, Xiao H, Zhang Y, Song Y. Speckle Tracking Based Strain Analysis Is Sensitive for Early Detection of Pathological Cardiac Hypertrophy. PLoS One 2016; 11:e0149155. [PMID: 26871457 PMCID: PMC4752445 DOI: 10.1371/journal.pone.0149155] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 01/27/2016] [Indexed: 11/19/2022] Open
Abstract
Cardiac hypertrophy is a key pathological process of many cardiac diseases. However, early detection of cardiac hypertrophy is difficult by the currently used non-invasive method and new approaches are in urgent need for efficient diagnosis of cardiac malfunction. Here we report that speckle tracking-based strain analysis is more sensitive than conventional echocardiography for early detection of pathological cardiac hypertrophy in the isoproterenol (ISO) mouse model. Pathological hypertrophy was induced by a single subcutaneous injection of ISO. Physiological cardiac hypertrophy was established by daily treadmill exercise for six weeks. Strain analysis, including radial strain (RS), radial strain rate (RSR) and longitudinal strain (LS), showed marked decrease as early as 3 days after ISO injection. Moreover, unlike the regional changes in cardiac infarction, strain analysis revealed global cardiac dysfunction that affects the entire heart in ISO-induced hypertrophy. In contrast, conventional echocardiography, only detected altered E/E', an index reflecting cardiac diastolic function, at 7 days after ISO injection. No change was detected on fractional shortening (FS), E/A and E'/A' at 3 days or 7 days after ISO injection. Interestingly, strain analysis revealed cardiac dysfunction only in ISO-induced pathological hypertrophy but not the physiological hypertrophy induced by exercise. Taken together, our study indicates that strain analysis offers a more sensitive approach for early detection of cardiac dysfunction than conventional echocardiography. Moreover, multiple strain readouts distinguish pathological cardiac hypertrophy from physiological hypertrophy.
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Affiliation(s)
- Xiangbo An
- Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptide, Ministry of Health, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Jingjing Wang
- Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptide, Ministry of Health, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Hao Li
- Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptide, Ministry of Health, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Zhizhen Lu
- Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptide, Ministry of Health, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Yan Bai
- Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptide, Ministry of Health, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Han Xiao
- Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptide, Ministry of Health, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
| | - Youyi Zhang
- Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptide, Ministry of Health, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
- * E-mail: (YZ); (YS)
| | - Yao Song
- Institute of Vascular Medicine, Peking University Third Hospital, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptide, Ministry of Health, Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing, 100191, China
- * E-mail: (YZ); (YS)
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38
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Todica A, Lehner S, Wang H, Zacherl MJ, Nekolla K, Mille E, Xiong G, Bartenstein P, la Fougère C, Hacker M, Böning G. Derivation of a respiration trigger signal in small animal list-mode PET based on respiration-induced variations of the ECG signal. J Nucl Cardiol 2016; 23:73-83. [PMID: 26068972 DOI: 10.1007/s12350-015-0154-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 04/15/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Raw PET list-mode data contains motion artifacts causing image blurring and decreased spatial resolution. Unless corrected, this leads to underestimation of the tracer uptake and overestimation of the lesion size, as well as inaccuracies with regard to left ventricular volume and ejection fraction (LVEF), especially in small animal imaging. METHODS AND RESULTS A respiratory trigger signal from respiration-induced variations in the electro-cardiogram (ECG) was detected. Original and revised list-mode PET data were used for calculation of left ventricular function parameters using both respiratory gating techniques. For adequately triggered datasets we saw no difference in mean respiratory cycle period between the reference standard (RRS) and the ECG-based (ERS) methods (1120 ± 159 ms vs 1120 ± 159 ms; P = n.s.). While the ECG-based method showed somewhat higher signal noise (66 ± 22 ms vs 51 ± 29 ms; P < .001), both respiratory triggering techniques yielded similar estimates for EDV, ESV, LVEF (RRS: 387 ± 56 µL, 162 ± 34 µL, 59 ± 5%; ERS: 389 ± 59 µL, 163 ± 35 µL, 59 ± 4%; P = n.s.). CONCLUSIONS This study showed that respiratory gating signals can be accurately derived from cardiac trigger information alone, without the additional requirement for dedicated measurement of the respiratory motion in rats.
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Affiliation(s)
- Andrei Todica
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany.
| | - Sebastian Lehner
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Hao Wang
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Mathias J Zacherl
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Katharina Nekolla
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Erik Mille
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Guoming Xiong
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany
- German Center for Vertigo and Balance Disorders, DSGZ, University of Munich, Munich, Germany
| | - Peter Bartenstein
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Christian la Fougère
- Department of Clinical Molecular Imaging and Nuclear Medicine, University Hospital Tübingen, Tübingen, Germany
| | - Marcus Hacker
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University Vienna, Vienna, Austria
| | - Guido Böning
- Department of Nuclear Medicine, University of Munich, Marchioninistr. 15, 81377, Munich, Germany
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Hamirani YS, Kundu BK, Zhong M, McBride A, Li Y, Davogustto GE, Taegtmeyer H, Bourque JM. Noninvasive Detection of Early Metabolic Left Ventricular Remodeling in Systemic Hypertension. Cardiology 2015; 133:157-62. [PMID: 26594908 DOI: 10.1159/000441276] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 09/23/2015] [Indexed: 12/28/2022]
Abstract
OBJECTIVES Hypertension (HTN) is a common cause of left ventricular hypertrophy (LVH). Sustained pressure overload induces a permanent myocardial switch from fatty-acid to glucose metabolism. In this study, we tested the hypothesis that metabolic remodeling, characterized by increased myocardial glucose uptake, precedes structural and functional remodeling in HTN-induced LVH. METHODS We recruited 31 patients: 11 with HTN only, 9 with HTN and LVH and 11 normotensive controls without LVH. Transthoracic echocardiography was performed to assess the function, mass, wall thickness and diastolic function of the left ventricle. Positron emission tomography imaging was performed, and the rate of myocardial 2-deoxy-2-[18F]fluoro-D-glucose uptake, Ki, was determined using a 3-compartment kinetic model. RESULTS The mean Ki values were significantly higher in HTN patients than in those with HTN and LVH (p < 0.001) and in controls (p = 0.003). The unexpected decrease in Ki with LVH may be secondary to a decreased Ki with diastolic dysfunction (DD), 0.039 ± 0.032 versus 0.072 ± 0.013 (p = 0.004). There was also a significant stepwise decrease in Ki with increasing DD grade (p = 0.04). CONCLUSION Glucose metabolic remodeling is detectable in hypertensive patients before the development of LVH. Furthermore, lower glucose uptake rates are observed in patients with DD. The mechanism for this last finding requires further investigation.
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Affiliation(s)
- Yasmin S Hamirani
- Cardiovascular Division, Department of Medicine, University of Virginia Health System, Charlottesville, Va., USA
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40
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Dong D, Li L, Gu P, Jin T, Wen M, Yuan C, Gao X, Liu C, Zhang Z. Profiling metabolic remodeling in PP2Acα deficiency and chronic pressure overload mouse hearts. FEBS Lett 2015; 589:3631-9. [DOI: 10.1016/j.febslet.2015.10.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 10/08/2015] [Accepted: 10/11/2015] [Indexed: 01/02/2023]
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41
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Li Y, Huang T, Zhang X, Zhong M, Walker NN, He J, Berr SS, Keller SR, Kundu BK. Determination of Fatty Acid Metabolism with Dynamic [
11
C]Palmitate Positron Emission Tomography of Mouse Heart In Vivo. Mol Imaging 2015. [DOI: 10.2310/7290.2015.00024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Yinlin Li
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Tao Huang
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Xinyue Zhang
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Min Zhong
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Natalie N. Walker
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Jiang He
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Stuart S. Berr
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Susanna R. Keller
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Bijoy K. Kundu
- From the Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA; Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, VA; Cardiovascular Research Center, University of Virginia, Charlottesville, VA; and School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
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Evans E, Buonincontri G, Izquierdo D, Methner C, Hawkes RC, Ansorge RE, Krieg T, Carpenter TA, Sawiak SJ. Combining MRI with PET for partial volume correction improves image-derived input functions in mice. IEEE TRANSACTIONS ON NUCLEAR SCIENCE 2015; 62:628-633. [PMID: 26213413 PMCID: PMC4510926 DOI: 10.1109/tns.2015.2433897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Accurate kinetic modelling using dynamic PET requires knowledge of the tracer concentration in plasma, known as the arterial input function (AIF). AIFs are usually determined by invasive blood sampling, but this is prohibitive in murine studies due to low total blood volumes. As a result of the low spatial resolution of PET, image-derived input functions (IDIFs) must be extracted from left ventricular blood pool (LVBP) ROIs of the mouse heart. This is challenging because of partial volume and spillover effects between the LVBP and myocardium, contaminating IDIFs with tissue signal. We have applied the geometric transfer matrix (GTM) method of partial volume correction (PVC) to 12 mice injected with 18F-FDG affected by a Myocardial Infarction (MI), of which 6 were treated with a drug which reduced infarction size [1]. We utilised high resolution MRI to assist in segmenting mouse hearts into 5 classes: LVBP, infarcted myocardium, healthy myocardium, lungs/body and background. The signal contribution from these 5 classes was convolved with the point spread function (PSF) of the Cambridge split magnet PET scanner and a non-linear fit was performed on the 5 measured signal components. The corrected IDIF was taken as the fitted LVBP component. It was found that the GTM PVC method could recover an IDIF with less contamination from spillover than an IDIF extracted from PET data alone. More realistic values of Ki were achieved using GTM IDIFs, which were shown to be significantly different (p<0.05) between the treated and untreated groups.
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Affiliation(s)
- Eleanor Evans
- Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK, CB2 0QQ ( )
| | - Guido Buonincontri
- Wolfson Brain Imaging Centre and the Department of Medicine, University of Cambridge, Cambridge, UK, CB2 0QQ ( )
| | - David Izquierdo
- Athinoula A. Martinos Center for Biomedical Imaging, 149 Thirteenth Street, Suite 2301, Charlestown, MA, 02129 ( )
| | - Carmen Methner
- Department of Medicine, University of Cambridge and is now at Oregon Health and Science University, Portland, OR, 97239 ( )
| | - Rob C Hawkes
- Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK, CB2 0QQ ( )
| | - Richard E Ansorge
- Department of Physics, University of Cambridge, Cambridge, UK, CB3 0HE ( )
| | - Thomas Krieg
- Member of the Department of Medicine, University of Cambridge, Cambridge, UK, CB2 0QQ ( )
| | - T Adrian Carpenter
- Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK, CB2 0QQ ( )
| | - Stephen J Sawiak
- Member of both the Wolfson Brain Imaging Centre, and the Behavioural and Clinical Neurosciences Institute, University of Cambridge, Cambridge, UK, CB2 3EB ( )
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43
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Kundu BK, Zhong M, Sen S, Davogustto G, Keller SR, Taegtmeyer H. Remodeling of glucose metabolism precedes pressure overload-induced left ventricular hypertrophy: review of a hypothesis. Cardiology 2015; 130:211-20. [PMID: 25791172 DOI: 10.1159/000369782] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 11/10/2014] [Indexed: 12/14/2022]
Abstract
When subjected to pressure overload, the ventricular myocardium shifts from fatty acids to glucose as its main source for energy provision and frequently increases its mass. Here, we review the evidence in support of the concept that metabolic remodeling, measured as an increased myocardial glucose uptake using dynamic positron emission tomography (PET) with the glucose analogue 2-deoxy-2-[(18)F]fluoro-D-glucose (FDG), precedes the onset of left ventricular hypertrophy (LVH) and heart failure. Consistent with this, early intervention with propranolol, which attenuates glucose uptake, prevents the maladaptive metabolic response and preserves cardiac function in vivo. We also review ex vivo studies suggesting a link between dysregulated myocardial glucose metabolism, intracellular accumulation of glucose 6-phosphate (G6P) and contractile dysfunction of the heart. G6P levels correlate with activation of mTOR (mechanistic target of rapamycin) and endoplasmic reticulum stress. This sequence of events could be prevented by pretreatment with rapamycin (mTOR inhibition) or metformin (enzyme 5'-AMP-activated protein kinase activation). In conclusion, we propose that metabolic imaging with FDG PET may provide a novel approach to guide the treatment of patients with hypertension-induced LVH.
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Affiliation(s)
- Bijoy K Kundu
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, Va., USA
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44
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Abdurrachim D, Luiken JJFP, Nicolay K, Glatz JFC, Prompers JJ, Nabben M. Good and bad consequences of altered fatty acid metabolism in heart failure: evidence from mouse models. Cardiovasc Res 2015; 106:194-205. [PMID: 25765936 DOI: 10.1093/cvr/cvv105] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2014] [Accepted: 02/18/2015] [Indexed: 12/25/2022] Open
Abstract
The shift in substrate preference away from fatty acid oxidation (FAO) towards increased glucose utilization in heart failure has long been interpreted as an oxygen-sparing mechanism. Inhibition of FAO has therefore evolved as an accepted approach to treat heart failure. However, recent data indicate that increased reliance on glucose might be detrimental rather than beneficial for the failing heart. This review discusses new insights into metabolic adaptations in heart failure. A particular focus lies on data obtained from mouse models with modulations of cardiac FA metabolism at different levels of the FA metabolic pathway and how these differently affect cardiac function. Based on studies in which these mouse models were exposed to ischaemic and non-ischaemic heart failure, we discuss whether and when modulations in FA metabolism are protective against heart failure.
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Affiliation(s)
- Desiree Abdurrachim
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, High Tech Campus 11, 5656 AE, PO BOX 513, Eindhoven 5600 MB, The Netherlands
| | - Joost J F P Luiken
- Department of Genetics and Cell Biology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Klaas Nicolay
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, High Tech Campus 11, 5656 AE, PO BOX 513, Eindhoven 5600 MB, The Netherlands
| | - Jan F C Glatz
- Department of Genetics and Cell Biology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Jeanine J Prompers
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, High Tech Campus 11, 5656 AE, PO BOX 513, Eindhoven 5600 MB, The Netherlands
| | - Miranda Nabben
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, High Tech Campus 11, 5656 AE, PO BOX 513, Eindhoven 5600 MB, The Netherlands Department of Genetics and Cell Biology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
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45
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Li Y, Huang T, Zhang X, Zhong M, Walker NN, He J, Berr SS, Keller SR, Kundu BK. Determination of Fatty Acid Metabolism with Dynamic [11C]Palmitate Positron Emission Tomography of Mouse Heart In Vivo. Mol Imaging 2015; 14:516-525. [PMID: 26462138 PMCID: PMC4625801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023] Open
Abstract
The goal of this study was to establish a quantitative method for measuring fatty acid (FA) metabolism with partial volume (PV) and spill-over (SP) corrections using dynamic [(11)C]palmitate positron emission tomographic (PET) images of mouse heart in vivo. Twenty-minute dynamic [(11)C]palmitate PET scans of four 18- to 20-week-old male C57BL/6 mice under isoflurane anesthesia were performed using a Focus F-120 PET scanner. A model-corrected blood input function, by which the input function with SP and PV corrections and the metabolic rate constants (k1-k5) are simultaneously estimated from the dynamic [(11)C]palmitate PET images of mouse hearts in a four-compartment tracer kinetic model, was used to determine rates of myocardial fatty acid oxidation (MFAO), myocardial FA esterification, myocardial FA use, and myocardial FA uptake. The MFAO thus measured in C57BL/6 mice was 375.03 ± 43.83 nmol/min/g. This compares well to the MFAO measured in perfused working C57BL/6 mouse hearts ex vivo of about 350 nmol/g/min and 400 nmol/min/g. FA metabolism was measured for the first time in mouse heart in vivo using dynamic [(11)C]palmitate PET in a four-compartment tracer kinetic model. MFAO obtained with this model was validated by results previously obtained with mouse hearts ex vivo.
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Affiliation(s)
- Yinlin Li
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, USA
- School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Tao Huang
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, USA
| | - Xinyue Zhang
- School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, China
| | - Min Zhong
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, USA
| | - Natalie N. Walker
- Department of Medicine, Division of Endocrinology and Metabolism, University of Virginia, VA, USA
| | - Jiang He
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, USA
| | - Stuart S. Berr
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, USA
| | - Susanna R. Keller
- Department of Medicine, Division of Endocrinology and Metabolism, University of Virginia, VA, USA
| | - Bijoy K. Kundu
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, USA
- Cardiovascular Research Center, University of Virginia, Charlottesville, VA, USA
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46
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Hoshide S, Nagai M, Yano Y, Ishikawa J, Eguchi K, Kario K. Association of high-sensitivity cardiac troponin T and N-terminal pro-brain-type natriuretic peptide with left ventricular structure: J-HOP study. J Clin Hypertens (Greenwich) 2014; 16:354-61. [PMID: 24811391 DOI: 10.1111/jch.12321] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 03/08/2014] [Accepted: 03/10/2014] [Indexed: 01/19/2023]
Abstract
Although both high-sensitivity cardiac troponin T (Hs-cTnT) and N-terminal pro-brain-type natriuretic peptide (NT-proBNP) levels are higher among patients with cardiac structural abnormalities than among those with apparently normal hearts, there is considerable overlap between the groups. The authors evaluated 1336 patients who had ≥1 cardiovascular risk factors, underwent echocardiography, and had Hs-cTnT and NT-proBNP measured and excluded patients with left ventricular (LV) dysfunction. The patients in the highest Hs-cTnT category in quintiles had an increased likelihood of abnormal relative wall thickness compared with those in the lowest category (odds ratio, 1.66; 95% confidence interval, 1.17-2.36; P<.01). However, no such association was found in the category of NT-proBNP. The patients in the highest NT-proBNP category had an increased likelihood of abnormal LV diastolic dimension/body surface area compared with those in the lowest category (odds ratio, 2.11; 95% confidence interval, 1.17-3.79; P<.05). However, no such association was found in the category of Hs-cTnT. The data suggest that the measurement of Hs-cTnT and NT-proBNP might provide information on cardiac structural abnormalities.
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Affiliation(s)
- Satoshi Hoshide
- Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, Tochigi, Japan
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47
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Kuntner C. Kinetic modeling in pre-clinical positron emission tomography. Z Med Phys 2014; 24:274-85. [PMID: 24629308 DOI: 10.1016/j.zemedi.2014.02.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 02/11/2014] [Accepted: 02/11/2014] [Indexed: 12/11/2022]
Abstract
Pre-clinical positron emission tomography (PET) has evolved in the last few years from pure visualization of radiotracer uptake and distribution towards quantification of the physiological parameters. For reliable and reproducible quantification the kinetic modeling methods used to obtain relevant parameters of radiotracer tissue interaction are important. Here we present different kinetic modeling techniques with a focus on compartmental models including plasma input models and reference tissue input models. The experimental challenges off deriving the plasma input function in rodents and the effect of anesthesia are discussed. Finally, in vivo application of kinetic modeling in various areas of pre-clinical research is presented and compared to human data.
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Affiliation(s)
- Claudia Kuntner
- Biomedical Systems, Health & Environment Department, AIT Austrian Institute of Technology GmbH, Seibersdorf, Austria.
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48
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TcGenerator Development: Up-to-DateTcRecovery Technologies for Increasing the Effectiveness ofMoUtilisation. SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS 2014. [DOI: 10.1155/2014/345252] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A review on theMosources available today and on theTcgenerators developed up to date for increasing the effectiveness ofMoutilisation is performed in the format of detailed description of the features and technical performance of the technological groups of theMoproduction andTcrecovery. The latest results of the endeavour in this field are also surveyed in regard of the technical solution for overcoming the shortage ofMosupply. The technological topics are grouped and discussed in a way to reflect the similarity in the technological process of each group. The following groups are included in this review which are high specific activityMo: the current issues of production, the efforts of more effective utilisation, and the high specific activityMo-basedTcgenerator andTcconcentration units; low specific activityMo: theMoproduction based on neutron capture and accelerators and the direct production ofTcand the methods of increasing the specific activity ofMousing Szilard-Chalmers reaction and high electric power isotopic separator; up-to-date technologies ofTcrecovery from low specific activityMo: the solvent extraction-basedTcgenerator, the sublimation methods forMo/Tcseparation, the electrochemical method forTcrecovery, and the column chromatographic methods forTcrecovery. Besides the traditionalTc-generator systems, the integratedTcgenerator systems (Tcgenerator column combined with postelution purification/concentration unit) are discussed with the format of process diagram and picture of real generator systems. These systems are the technetium selective sorbent column-based generators, the high Mo-loading capacity column-based integratedTcgenerator systems which include the saline-eluted generator systems, and the nonsaline aqueous and organic solvent eluent-eluted generator systems using high Mo-loading capacity molybdategel and recently developed sorbent columns.Tcconcentration methods used in theTcrecovery from low specific activityMoare also discussed with detailed process diagrams which are surveyed in two groups forTcconcentration from the saline and nonsalineTc-eluates. The evaluation methods for the performance ofTc-recovery/concentration process and for theTc-elution capability versus Mo-loading capacity of generator column produced using low specific activityMosource are briefly reported. Together with the theoretical aspects ofTc/Moand sorbent chemistry, these evaluation/assessment processes will be useful for any further development in the field of theTcrecovery andMo/Tcgenerator production.
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Abstract
Abnormalities in myocardial substrate metabolism play a central role in the manifestations of most forms of cardiac disease such as ischemic heart disease, heart failure, hypertensive heart disease, and the cardiomyopathy due to either obesity or diabetes mellitus. Their importance is exemplified by both the development of numerous imaging tools designed to detect the specific metabolic perturbations or signatures related to these different diseases, and the vigorous efforts in drug discovery/development targeting various aspects of myocardial metabolism. Since the prior review in 2005, we have gained new insights into how perturbations in myocardial metabolism contribute to various forms of cardiac disease. For example, the application of advanced molecular biologic techniques and the development of elegant genetic models have highlighted the pleiotropic actions of cellular metabolism on energy transfer, signal transduction, cardiac growth, gene expression, and viability. In parallel, there have been significant advances in instrumentation, radiopharmaceutical design, and small animal imaging, which now permit a near completion of the translational pathway linking in-vitro measurements of metabolism with the human condition. In this review, most of the key advances in metabolic imaging will be described, their contribution to cardiovascular research highlighted, and potential new clinical applications proposed.
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Affiliation(s)
- Robert J Gropler
- Division of Radiological Sciences, Cardiovascular Imaging Laboratory, Edward Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S. Kingshighway, St. Louis, MO, 63110, USA,
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50
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Böning G, Todica A, Vai A, Lehner S, Xiong G, Mille E, Ilhan H, la Fougère C, Bartenstein P, Hacker M. Erroneous cardiac ECG-gated PET list-mode trigger events can be retrospectively identified and replaced by an offline reprocessing approach: first results in rodents. Phys Med Biol 2013; 58:7937-59. [PMID: 24165267 DOI: 10.1088/0031-9155/58/22/7937] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The assessment of left ventricular function, wall motion and myocardial viability using electrocardiogram (ECG)-gated [(18)F]-FDG positron emission tomography (PET) is widely accepted in human and in preclinical small animal studies. The nonterminal and noninvasive approach permits repeated in vivo evaluations of the same animal, facilitating the assessment of temporal changes in disease or therapy response. Although well established, gated small animal PET studies can contain erroneous gating information, which may yield to blurred images and false estimation of functional parameters. In this work, we present quantitative and visual quality control (QC) methods to evaluate the accuracy of trigger events in PET list-mode and physiological data. Left ventricular functional analysis is performed to quantify the effect of gating errors on the end-systolic and end-diastolic volumes, and on the ejection fraction (EF). We aim to recover the cardiac functional parameters by the application of the commonly established heart rate filter approach using fixed ranges based on a standardized population. In addition, we propose a fully reprocessing approach which retrospectively replaces the gating information of the PET list-mode file with appropriate list-mode decoding and encoding software. The signal of a simultaneously acquired ECG is processed using standard MATLAB vector functions, which can be individually adapted to reliably detect the R-peaks. Finally, the new trigger events are inserted into the PET list-mode file. A population of 30 mice with various health statuses was analyzed and standard cardiac parameters such as mean heart rate (119 ms ± 11.8 ms) and mean heart rate variability (1.7 ms ± 3.4 ms) derived. These standard parameter ranges were taken into account in the QC methods to select a group of nine optimal gated and a group of eight sub-optimal gated [(18)F]-FDG PET scans of mice from our archive. From the list-mode files of the optimal gated group, we randomly deleted various fractions (5% to 60%) of contained trigger events to generate a corrupted group. The filter approach was capable to correct the corrupted group and yield functional parameters with no significant difference to the optimal gated group. We successfully demonstrated the potential of the fully reprocessing approach by applying it to the sub-optimal group, where the functional parameters were significantly improved after reprocessing (mean EF from 41% ± 16% to 60% ± 13%). When applied to the optimal gated group the fully reprocessing approach did not alter the functional parameters significantly (mean EF from 64% ± 8% to 64 ± 7%). This work presents methods to determine and quantify erroneous gating in small animal gated [(18)F]-FDG PET scans. We demonstrate the importance of a quality check for cardiac triggering contained in PET list-mode data and the benefit of optionally reprocessing the fully recorded physiological information to retrospectively modify or fully replace the cardiac triggering in PET list-mode data. We aim to provide a preliminary guideline of how to proceed in the presence of errors and demonstrate that offline reprocessing by filtering erroneous trigger events and retrospective gating by ECG processing is feasible. Future work will focus on the extension by additional QC methods, which may exploit the amplitude of trigger events and ECG signal by means of pattern recognition. Furthermore, we aim to transfer the proposed QC methods and the fully reprocessing approach to human myocardial PET/CT.
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Affiliation(s)
- Guido Böning
- Department of Nuclear Medicine, Ludwig-Maximilians University of Munich, Munich, Germany
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