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Li B, Han L, Wang H, Zheng Y. Albumin-templated manganese carbonate nanoparticles for precise magnetic resonance imaging of acute myocardial infarction. J Biomater Appl 2022; 37:493-501. [PMID: 35574609 DOI: 10.1177/08853282221102673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Myocardial infarction (MI) is a major cause of death worldwide. Early and precise diagnosis of myocardial viability after MI is extremely important for effective treatment and prognosis evaluation. Herein, we developed the BSA-templated manganese carbonate (MnCO3@BSA) nanoparticles as an MR imaging contrast agent for accurate detection of the infarcted regions. The chemophysical features, targeting capability toward the infarct, and biocompatibility were evaluated. The nanoparticles showed superior chemical stability. In vitro study suggested that the MnCO3@BSA nanoparticles do not enter normal cardiomyocytes. MR imaging indicated that the MnCO3@BSA with a high longitudinal (r1) relaxivity of 5.84 mM-1s-1 at physiological condition specifically accumulated into the infarcted regions of myocardial ischemia/reperfusion (I/R) mice. In addition, the MnCO3@BSA nanoparticles exhibited low cytotoxicity to cardiomyocytes, no damage to organs and good hemocompatibility. Thereby, the MnCO3@BSA nanoparticles manifested great potential as an extracellular contrast agent of MR imaging for sensitive and specific detection of the infarcted regions during acute myocardial I/R injury.
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Affiliation(s)
- Bing Li
- Department of Pharmacology, School of Pharmaceutical Sciences, 12517Capital Medical University, Beijing, China
| | - Luyi Han
- School of Basic Medical Sciences, 12517Capital Medical University, Beijing, China
| | - Hao Wang
- Department of Human Anatomy, School of Basic Medical Sciences, 12517Capital Medical University, Beijing, China
| | - Yuanyuan Zheng
- Department of Pharmacology, School of Pharmaceutical Sciences, 12517Capital Medical University, Beijing, China
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Jasmin NH, Thin MZ, Johnson RD, Jackson LH, Roberts TA, David AL, Lythgoe MF, Yang PC, Davidson SM, Camelliti P, Stuckey DJ. Myocardial Viability Imaging using Manganese-Enhanced MRI in the First Hours after Myocardial Infarction. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2003987. [PMID: 34105284 PMCID: PMC8188227 DOI: 10.1002/advs.202003987] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 02/08/2021] [Indexed: 05/19/2023]
Abstract
Early measurements of tissue viability after myocardial infarction (MI) are essential for accurate diagnosis and treatment planning but are challenging to obtain. Here, manganese, a calcium analogue and clinically approved magnetic resonance imaging (MRI) contrast agent, is used as an imaging biomarker of myocardial viability in the first hours after experimental MI. Safe Mn2+ dosing is confirmed by measuring in vitro beating rates, calcium transients, and action potentials in cardiomyocytes, and in vivo heart rates and cardiac contractility in mice. Quantitative T1 mapping-manganese-enhanced MRI (MEMRI) reveals elevated and increasing Mn2+ uptake in viable myocardium remote from the infarct, suggesting MEMRI offers a quantitative biomarker of cardiac inotropy. MEMRI evaluation of infarct size at 1 h, 1 and 14 days after MI quantifies myocardial viability earlier than the current gold-standard technique, late-gadolinium-enhanced MRI. These data, coupled with the re-emergence of clinical Mn2+ -based contrast agents open the possibility of using MEMRI for direct evaluation of myocardial viability early after ischemic onset in patients.
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Affiliation(s)
- Nur Hayati Jasmin
- UCL Centre for Advanced Biomedical ImagingDivision of MedicineUniversity College LondonLondonWC1E 6DDUK
- School of Medical ImagingFaculty of Health SciencesUniversiti Sultan Zainal AbidinKuala Terengganu21300Malaysia
| | - May Zaw Thin
- UCL Centre for Advanced Biomedical ImagingDivision of MedicineUniversity College LondonLondonWC1E 6DDUK
| | - Robert D. Johnson
- School of Biosciences and MedicineUniversity of SurreyGuildfordGU2 7XHUK
| | - Laurence H. Jackson
- School of Biomedical Engineering & Imaging SciencesKing's College LondonLondonSE1 7EHUK
| | - Thomas A. Roberts
- School of Biomedical Engineering & Imaging SciencesKing's College LondonLondonSE1 7EHUK
| | - Anna L. David
- UCL Elizabeth Garrett Anderson Institute for Women's HealthLondonWC1E 6BTUK
| | - Mark F. Lythgoe
- UCL Centre for Advanced Biomedical ImagingDivision of MedicineUniversity College LondonLondonWC1E 6DDUK
| | - Philip C. Yang
- Division of Cardiovascular MedicineDepartment of MedicineStanford UniversityStanfordCA94305USA
| | - Sean M. Davidson
- The Hatter Cardiovascular InstituteUniversity College London67 Chenies MewsLondonWC1E 6HXUK
| | - Patrizia Camelliti
- School of Biosciences and MedicineUniversity of SurreyGuildfordGU2 7XHUK
| | - Daniel J. Stuckey
- UCL Centre for Advanced Biomedical ImagingDivision of MedicineUniversity College LondonLondonWC1E 6DDUK
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Wen LY, Yang ZG, Li ZL, Ai H, Xia CC, Zhang LZ, Lin BB, Zhang K, Fu H, Wu CQ, Yang L, Fan HM, Guo YK. Accurate identification of myocardial viability after myocardial infarction with novel manganese chelate-based MR imaging. NMR IN BIOMEDICINE 2019; 32:e4158. [PMID: 31393647 DOI: 10.1002/nbm.4158] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 06/17/2019] [Accepted: 07/02/2019] [Indexed: 02/05/2023]
Abstract
We developed a novel manganese (Mn2+ ) chelate for magnetic resonance imaging (MRI) assessment of myocardial viability in acute and chronic myocardial infarct (MI) models, and compared it with Gadolinium-based delay enhancement MRI (Gd3+ -DEMRI) and histology. MI was induced in 14 rabbits by permanent occlusion of the left circumflex coronary artery. Gd3+ -DEMRI and Mn2+ chelate-based delayed enhancement MRI (Mn2+ chelate-DEMRI) were performed at 7 days (acute MI, n = 8) or 8 weeks (chronic MI, n = 6) after surgery with sequential injection of 0.15 mmol/kg Gd3+ and Mn2+ chelate. The biodistribution of Mn2+ in tissues and blood was measured at 1.5 and 24 h. Blood pressure, heart rate (HR), left ventricular (LV) function, and infarct fraction (IF) were analyzed, and IF was compared with the histology. The Mn2+ chelate group maintained a stable hemodynamic status during experiment. For acute and chronic MI, all rabbits survived without significant differences in HR or LV function before and after injection of Mn2+ chelate or Gd3+ (p > 0.05). Mn2+ chelate mainly accumulated in the kidney, liver, spleen, and heart at 1.5 h, with low tissue uptake and urine residue at 24 h after injection. In the acute MI group, there was no significant difference in IF between Mn2+ chelate-DEMRI and histology (22.92 ± 2.21% vs. 21.79 ± 2.25%, respectively, p = 0.87), while Gd3+ -DEMRI overestimated IF, as compared with histology (24.54 ± 1.73%, p = 0.04). In the chronic MI group, there was no significant difference in IF between the Mn2+ chelate-DEMRI, Gd3+ -DEMRI, and histology (29.50 ± 11.39%, 29.95 ± 9.40%, and 29.00 ± 10.44%, respectively, p > 0.05), and all three were well correlated (r = 0.92-0.96, p < 0.01). We conclude that the use of Mn2+ chelate-DEMRI is reliable for MI visualization and identifies acute MI more accurately than Gd3+ -DEMRI.
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Affiliation(s)
- Ling-Yi Wen
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, China
| | - Zhi-Gang Yang
- Department of Radiology, West China Hospital, Sichuan University, China
| | - Zhen-Lin Li
- Department of Radiology, West China Hospital, Sichuan University, China
| | - Hua Ai
- National Engineering Research Center for Biomaterials, Sichuan University, China
| | - Chun-Chao Xia
- Department of Radiology, West China Hospital, Sichuan University, China
| | - Li-Zhi Zhang
- Department of Radiology, West China Hospital, Sichuan University, China
| | - Bin-Bin Lin
- National Engineering Research Center for Biomaterials, Sichuan University, China
| | - Kun Zhang
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, China
| | - Hang Fu
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, China
| | - Chang-Qiang Wu
- Sichuan Key Laboratory of Medical Imaging and School of Medical Imaging, North Sichuan Medical College, China
| | - Li Yang
- National Engineering Research Center for Biomaterials, Sichuan University, China
| | - Hai-Ming Fan
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, China
| | - Ying-Kun Guo
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, China
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Zhang X, Qiu B, Wei Z, Yan F, Shi C, Su S, Liu X, Ji JX, Xie G. Three-dimensional self-gated cardiac MR imaging for the evaluation of myocardial infarction in mouse model on a 3T clinical MR system. PLoS One 2017; 12:e0189286. [PMID: 29216303 PMCID: PMC5720776 DOI: 10.1371/journal.pone.0189286] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 11/23/2017] [Indexed: 12/25/2022] Open
Abstract
Purpose To develop and assess a three-dimensional (3D) self-gated technique for the evaluation of myocardial infarction (MI) in mouse model without the use of external electrocardiogram (ECG) trigger and respiratory motion sensor on a 3T clinical MR system. Methods A 3D T1-weighted GRE sequence with stack-of-stars sampling trajectories was developed and performed on six mice with MIs that were injected with a gadolinium-based contrast agent at a 3T clinical MR system. Respiratory and cardiac self-gating signals were derived from the Cartesian mapping of the k-space center along the partition encoding direction by bandpass filtering in image domain. The data were then realigned according to the predetermined self-gating signals for the following image reconstruction. In order to accelerate the data acquisition, image reconstruction was based on compressed sensing (CS) theory by exploiting temporal sparsity of the reconstructed images. In addition, images were also reconstructed from the same realigned data by conventional regridding method for demonstrating the advantageous of the proposed reconstruction method. Furthermore, the accuracy of detecting MI by the proposed method was assessed using histological analysis as the standard reference. Linear regression and Bland-Altman analysis were used to assess the agreement between the proposed method and the histological analysis. Results Compared to the conventional regridding method, the proposed CS method reconstructed images with much less streaking artifact, as well as a better contrast-to-noise ratio (CNR) between the blood and myocardium (4.1 ± 2.1 vs. 2.9 ± 1.1, p = 0.031). Linear regression and Bland-Altman analysis demonstrated that excellent correlation was obtained between infarct sizes derived from the proposed method and histology analysis. Conclusion A 3D T1-weighted self-gating technique for mouse cardiac imaging was developed, which has potential for accurately evaluating MIs in mice at 3T clinical MR system without the use of external ECG trigger and respiratory motion sensor.
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Affiliation(s)
- Xiaoyong Zhang
- Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, China
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Bensheng Qiu
- Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, China
- * E-mail: (GX); (BQ)
| | - Zijun Wei
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Fei Yan
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Caiyun Shi
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Shi Su
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Xin Liu
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Jim X. Ji
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas, United States of America
| | - Guoxi Xie
- The Sixth Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
- Department of Biomedical Engineering, Guangzhou Medical University, Guangzhou, China
- * E-mail: (GX); (BQ)
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Crowe LA, Montecucco F, Carbone F, Friedli I, Hachulla AL, Braunersreuther V, Mach F, Vallée JP. 4D cardiac imaging at clinical 3.0T provides accurate assessment of murine myocardial function and viability. Magn Reson Imaging 2017; 44:46-54. [PMID: 28827099 DOI: 10.1016/j.mri.2017.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 07/22/2017] [Accepted: 07/23/2017] [Indexed: 12/01/2022]
Abstract
OBJECTIVES We validate a 4D strategy tailored for 3T clinical systems to simultaneously quantify function and infarct size in wild type mice after ischemia/reperfusion, with improved spatial and temporal resolution by comparison to previous published protocols using clinical field MRI systems. METHODS C57BL/6J mice underwent 60min ischemia/reperfusion (n=14) or were controls without surgery (n=6). Twenty-four hours after surgery mice were imaged with gadolinium injection and sacrificed for post-mortem MRI and histology with serum also taken for Troponin I levels. The double ECG- and respiratory-triggered 3D FLASH (Fast Low Angle Shot) gradient echo (GRE) cine sequence had an acquired isotropic resolution of 344μm, TR/TE of 7.8/2.9ms and acquisition time 25-35min. The conventional 2D FLASH cine sequence had the same in-plane resolution of 344μm, 1mm slice thickness and TR/TE 11/5.4ms for an acquisition time of 20-25min plus 5min for planning. Left ventricle (LV) and right ventricle (RV) volumes were measured and functional parameters compared 2D to 3D, left to right and for inter and intra observer reproducibility. MRI infarct volume was compared to histology. RESULTS For the function evaluation, the 3D cine outperformed 2D cine for spatial and temporal resolution. Protocol time for the two methods was equivalent (25-35min). Flow artifacts were reduced (p=0.008) and epi/endo-cardial delineation showed good intra and interobserver reproducibility. Paired t-test comparing ejection volume left to right showed no significant difference for 3D (p=0.37), nor 2D (p=0.30) and correlation slopes of left to right EV were 1.17 (R2=0.75) for 2D and 1.05 (R2=0.50) for 3D. Quantifiable 'late gadolinium enhancement' infarct volume was seen only with the 3D cine and correlated to histology (R2=0.89). Left ejection fraction and MRI-measured infarct volume correlated (R2>0.3). CONCLUSIONS The 4D strategy, with contrast injection, was validated in mice for function and infarct quantification from a single scan with minimal slice planning.
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Affiliation(s)
- Lindsey A Crowe
- Division of Radiology, Department of Radiology and Medical Informatics, Geneva University Hospital and Faculty of Medicine, University of Geneva, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| | - Fabrizio Montecucco
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy; IRCCS AOU San Martino - IST, Genova, 10 Largo Rosanna Benzi, 16132 Genoa, Italy.
| | - Federico Carbone
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
| | - Iris Friedli
- Division of Radiology, Department of Radiology and Medical Informatics, Geneva University Hospital and Faculty of Medicine, University of Geneva, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| | - Anne-Lise Hachulla
- Division of Radiology, Department of Radiology and Medical Informatics, Geneva University Hospital and Faculty of Medicine, University of Geneva, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| | - Vincent Braunersreuther
- Division of Pathology, Department of Genetics and Laboratory Medicine, Geneva University Hospitals, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| | - François Mach
- Division of Cardiology, Foundation for Medical Researches, Faculty of Medicine, Department of Internal Medicine, University of Geneva, 64 avenue de la Roseraie, 1211 Geneva, Switzerland.
| | - Jean-Paul Vallée
- Division of Radiology, Department of Radiology and Medical Informatics, Geneva University Hospital and Faculty of Medicine, University of Geneva, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
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Chung WJ, Cho A, Byun K, Moon J, Ge X, Seo HS, Moon E, Dash R, Yang PC. Apelin-13 infusion salvages the peri-infarct region to preserve cardiac function after severe myocardial injury. Int J Cardiol 2016; 222:361-367. [PMID: 27500765 DOI: 10.1016/j.ijcard.2016.07.263] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Revised: 07/22/2016] [Accepted: 07/30/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Apelin-13 (A13) regulates cardiac homeostasis. However, the effects and mechanism of A13 infusion after an acute myocardial injury (AMI) have not been elucidated. This study assesses the restorative effects and mechanism of A13 on the peri-infarct region in murine AMI model. METHODS 51 FVB/N mice (12weeks, 30g) underwent AMI. A week following injury, continuous micro-pump infusion of A13 (0.5μg/g/day) and saline was initiated for 4-week duration. Dual contrast MRI was conducted on weeks 1, 2, 3, and 5, consisting of delayed-enhanced and manganese-enhanced MRI. Four mice in each group were followed for an extended period of 4weeks without further infusion and underwent MRI scans on weeks 7 and 9. RESULTS A13 infusion demonstrated preserved LVEF compared to saline from weeks 1 to 4 (21.9±3.2% to 23.1±1.7%* vs. 23.5±1.7% to 16.9±2.8%, *p=0.02), which persisted up to 9weeks post-MI (+1.4%* vs. -9.4%, *p=0.03). Mechanistically, dual contrast MRI demonstrated significant decrease in the peri-infarct and scar % volume in A13 group from weeks 1 to 4 (15.1 to 7.4% and 34.3 to 25.1%, p=0.02, respectively). This was corroborated by significant increase in 5-ethynyl-2'-deoxyuridine (EdU(+)) cells by A13 vs. saline groups in the peri-infarct region (16.5±3.1% vs. 8.1±1.6%; p=0.04), suggesting active cell mitosis. Finally, significantly enhanced mobilization of CD34(+) cells in the peripheral blood and up-regulation of APJ, fibrotic, and apoptotic genes in the peri-infarct region were found. CONCLUSIONS A13 preserves cardiac performance by salvaging the peri-infarct region and may contribute to permanent restoration of the severely injured myocardium.
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Affiliation(s)
- Wook-Jin Chung
- Department of Cardiovascular Medicine, Stanford University, Stanford, CA, USA; Department of Cardiovascular Medicine, Gachon University, Incheon, Republic of Korea; Gachon Cardiovascular Research Institute, Gachon University, Incheon, Republic of Korea
| | - Ahryon Cho
- Department of Pathology, Stanford University, Stanford, CA, USA
| | - Kyunghee Byun
- Gachon Cardiovascular Research Institute, Gachon University, Incheon, Republic of Korea; Department of Anatomy and Cell Biology, Gachon University, Incheon, Republic of Korea; Center for Genomics and Proteomics & Stem Cell Core Facility, Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Republic of Korea
| | - Jeongsik Moon
- Gachon Cardiovascular Research Institute, Gachon University, Incheon, Republic of Korea; Center for Genomics and Proteomics & Stem Cell Core Facility, Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Republic of Korea
| | - Xiaohu Ge
- Department of Cardiovascular Medicine, Stanford University, Stanford, CA, USA
| | - Hye-Sun Seo
- Division of Cardiology, Soon Chun Hyang University College of Medicine, Bucheon, Republic of Korea
| | - Ejung Moon
- Department of Radiation Oncology, Stanford University, Stanford, CA, USA
| | - Rajesh Dash
- Department of Cardiovascular Medicine, Stanford University, Stanford, CA, USA
| | - Phillip C Yang
- Department of Cardiovascular Medicine, Stanford University, Stanford, CA, USA.
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Telmisartan in the diabetic murine model of acute myocardial infarction: dual contrast manganese-enhanced and delayed enhancement MRI evaluation of the peri-infarct region. Cardiovasc Diabetol 2016; 15:24. [PMID: 26846539 PMCID: PMC4743104 DOI: 10.1186/s12933-016-0348-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 01/28/2016] [Indexed: 12/26/2022] Open
Abstract
Background
A novel MRI technique, employing dual contrast manganese-enhanced MRI (MEMRI) and delayed enhancement MRI (DEMRI), can evaluate the physiologically unstable peri-infarct region. Dual contrast MEMRI–DEMRI enables comprehensive evaluation of telmisartan to salvage the peri-infarct injury to elucidate the underlying mechanism of restoring the ischemic cardiomyopathy in the diabetic mouse model. Methods and results Dual contrast MEMRI–DEMRI was performed on weeks 1, 2, and 4 following initiation of telmisartan treatment in 24 left anterior descendent artery ligated diabetic mice. The MRI images were analyzed for core infarct, peri-infarct, left ventricular end-diastolic, end-systolic volumes, and the left ventricular ejection fraction (LVEF). Transmission electron microscopy (TEM) and real-time PCR were used for ex vivo analysis of the myocardium. Telmisartan vs. control groups demonstrated significantly improved LVEF at weeks 1, 2, and 4, respectively (33 ± 7 %*** vs. 19 ± 5 %, 29 ± 3 %*** vs. 22 ± 4 %, and 31 ± 2 %*** vs 18 ± 6 %, ***p < 0.001). The control group demonstrated significant differences in the scar volume measured by MEMRI and DEMRI, demonstrating peri-infarct injury. Telmisartan group significantly salvaged the peri-infarct injury. The myocardial effects were validated by TEM, which confirmed the presence of the injured but viable cardiomyocyte morphology in the peri-infarct region and by flow cytometry of venous blood, which demonstrated significantly increased circulating endothelial progenitor cells (EPCs). Conclusion The improved cardiac function in ischemic cardiomyopathy of diabetic mice by telmisartan is attributed to the attenuation of the peri-infarct injury by the angiogenic effects of EPCs to salvage the injured cardiomyocytes. Dual-contrast MEMRI–DEMRI technique tracked the therapeutic effects of telmisartan on the injured myocardium longitudinally.
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8
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Castets CR, Ribot EJ, Lefrançois W, Trotier AJ, Thiaudière E, Franconi JM, Miraux S. Fast and robust 3D T1 mapping using spiral encoding and steady RF excitation at 7 T: application to cardiac manganese enhanced MRI (MEMRI) in mice. NMR IN BIOMEDICINE 2015; 28:881-889. [PMID: 25989986 DOI: 10.1002/nbm.3327] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 03/19/2015] [Accepted: 04/16/2015] [Indexed: 06/04/2023]
Abstract
Mapping longitudinal relaxation times in 3D is a promising quantitative and non-invasive imaging tool to assess cardiac remodeling. Few methods are proposed in the literature allowing us to perform 3D T1 mapping. These methods often require long scan times and use a low number of 3D images to calculate T1 . In this project, a fast 3D T1 mapping method using a stack-of-spirals sampling scheme and regular RF pulse excitation at 7 T is presented. This sequence, combined with a newly developed fitting procedure, allowed us to quantify T1 of the whole mouse heart with a high spatial resolution of 208 × 208 × 315 µm(3) in 10-12 min acquisition time. The sensitivity of this method for measuring T1 variations was demonstrated on mouse hearts after several injections of manganese chloride (doses from 25 to 150 µmol kg(-1) ). T1 values were measured in vivo in both pre- and post-contrast experiments. This protocol was also validated on ischemic mice to demonstrate its efficiency to visualize tissue damage induced by a myocardial infarction. This study showed that combining spiral gradient shape and steady RF excitation enabled fast and robust 3D T1 mapping of the entire heart with a high spatial resolution.
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Affiliation(s)
- Charles R Castets
- Centre de Resonance Magnetique des Systemes Biologiques, UMR 5536 CNRS/Universite de Bordeaux, Bordeaux Cedex, France
| | - Emeline J Ribot
- Centre de Resonance Magnetique des Systemes Biologiques, UMR 5536 CNRS/Universite de Bordeaux, Bordeaux Cedex, France
| | - William Lefrançois
- Centre de Resonance Magnetique des Systemes Biologiques, UMR 5536 CNRS/Universite de Bordeaux, Bordeaux Cedex, France
| | - Aurélien J Trotier
- Centre de Resonance Magnetique des Systemes Biologiques, UMR 5536 CNRS/Universite de Bordeaux, Bordeaux Cedex, France
| | - Eric Thiaudière
- Centre de Resonance Magnetique des Systemes Biologiques, UMR 5536 CNRS/Universite de Bordeaux, Bordeaux Cedex, France
| | - Jean-Michel Franconi
- Centre de Resonance Magnetique des Systemes Biologiques, UMR 5536 CNRS/Universite de Bordeaux, Bordeaux Cedex, France
| | - Sylvain Miraux
- Centre de Resonance Magnetique des Systemes Biologiques, UMR 5536 CNRS/Universite de Bordeaux, Bordeaux Cedex, France
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9
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Andrews M, Giger ML, Roman BB. Manganese-enhanced MRI detection of impaired calcium regulation in a mouse model of cardiac hypertrophy. NMR IN BIOMEDICINE 2015; 28:255-263. [PMID: 25523065 PMCID: PMC4451202 DOI: 10.1002/nbm.3249] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 11/14/2014] [Accepted: 11/21/2014] [Indexed: 06/04/2023]
Abstract
The aim of this study was to use manganese (Mn)-enhanced MRI (MEMRI) to detect changes in calcium handling associated with cardiac hypertrophy in a mouse model, and to determine whether the impact of creatine kinase ablation is detectable using this method. Male C57BL/6 (C57, n = 11) and male creatine kinase double-knockout (CK-M/Mito(-/-) , DBKO, n = 12) mice were imaged using the saturation recovery Look-Locker T1 mapping sequence before and after the development of cardiac hypertrophy. Hypertrophy was induced via subcutaneous continuous 3-day infusion of isoproterenol, and sham mice not subjected to cardiac hypertrophy were also imaged. During each scan, the contrast agent Mn was administered and the resulting change in R1 (=1/T1) was calculated. Two anatomical regions of interest (ROIs) were considered, the left-ventricular free wall (LVFW) and the septum, and one ROI in an Mn-containing standard placed next to the mouse. We found statistically significant (p < 0.05) decreases in the uptake of Mn in both the LVFW and septum following the induction of cardiac hypertrophy. No statistically significant decreases were detected in the standard, and no statistically significant differences were found among the sham mice. Using a murine model, we successfully demonstrated that changes in Mn uptake as a result of cardiac hypertrophy are detectable using the functional contrast agent and calcium mimetic Mn. Our measurements showed a decrease in the relaxivity (R1) of the myocardium following cardiac hypertrophy compared with normal control mice.
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Long-term left ventricular remodelling in rat model of nonreperfused myocardial infarction: sequential MR imaging using a 3T clinical scanner. J Biomed Biotechnol 2012; 2012:504037. [PMID: 23118511 PMCID: PMC3479400 DOI: 10.1155/2012/504037] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Accepted: 06/11/2012] [Indexed: 11/18/2022] Open
Abstract
Purpose. To evaluate whether 3T clinical MRI with a small-animal coil and gradient-echo (GE) sequence could be used to characterize long-term left ventricular remodelling (LVR) following nonreperfused myocardial infarction (MI) using semi-automatic segmentation software (SASS) in a rat model. Materials and Methods. 5 healthy rats were used to validate left ventricular mass (LVM) measured by MRI with postmortem values. 5 sham and 7 infarcted rats were scanned at 2 and 4 weeks after surgery to allow for functional and structural analysis of the heart. Measurements included ejection fraction (EF), end-diastolic volume (EDV), end-systolic volume (ESV), and LVM. Changes in different regions of the heart were quantified using wall thickness analyses. Results. LVM validation in healthy rats demonstrated high correlation between MR and postmortem values. Functional assessment at 4 weeks after MI revealed considerable reduction in EF, increases in ESV, EDV, and LVM, and contractile dysfunction in infarcted and noninfarcted regions. Conclusion. Clinical 3T MRI with a small animal coil and GE sequence generated images in a rat heart with adequate signal-to-noise ratio (SNR) for successful semiautomatic segmentation to accurately and rapidly evaluate long-term LVR after MI.
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Geelen T, Paulis LEM, Coolen BF, Nicolay K, Strijkers GJ. Contrast-enhanced MRI of murine myocardial infarction - part I. NMR IN BIOMEDICINE 2012; 25:953-968. [PMID: 22308108 DOI: 10.1002/nbm.2768] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 11/07/2011] [Accepted: 11/29/2011] [Indexed: 05/31/2023]
Abstract
The use of contrast agents has added considerable value to the existing cardiac MRI toolbox that can be used to study murine myocardial infarction, as it enables detailed in vivo visualization of the molecular and cellular processes that occur in the infarcted and remote tissue. A variety of non-targeted and targeted contrast agents to study myocardial infarction are available and under development. Manganese, which acts as a calcium analogue, can be used to assess cell viability. Traditionally, low-molecular-weight Gd-containing contrast agents are employed to measure infarct size in a late gadolinium enhancement experiment. Gd-based blood-pool agents are used to study the vascular status of the myocardium. The use of targeted contrast agents facilitates more detailed imaging of pathophysiological processes in the acute and chronic infarct. Cell death was visualized by contrast agents functionalized with annexin A5 that binds specifically to phosphatidylserine accessible on dying cells and with an agent that binds to the exposed DNA of dead cells. Inflammation in the myocardium was depicted by contrast agents that target cell adhesion molecules expressed on activated endothelium, by contrast agents that are phagocytosed by inflammatory cells, and by using a probe that targets enzymes excreted by inflammatory cells. Cardiac remodeling processes were visualized with a contrast agent that binds to angiogenic vasculature and with an MR probe that specifically binds to collagen in the fibrotic myocardium. These recent advances in murine contrast-enhanced cardiac MRI have made a substantial contribution to the visualization of the pathophysiology of myocardial infarction, cardiac remodeling processes and the progression to heart failure, which helps to design new treatments. This review discusses the advances and challenges in the development and application of MRI contrast agents to study murine myocardial infarction.
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Affiliation(s)
- Tessa Geelen
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, the Netherlands
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Delattre BMA, Van De Ville D, Braunersreuther V, Pellieux C, Hyacinthe JN, Lerch R, Mach F, Vallée JP. High Time-Resolved Cardiac Functional Imaging Using Temporal Regularization for Small Animal on a Clinical 3T Scanner. IEEE Trans Biomed Eng 2012; 59:929-35. [DOI: 10.1109/tbme.2011.2174363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Delattre BMA, Braunersreuther V, Gardier S, Hyacinthe JN, Crowe LA, Mach F, Vallée JP. Manganese kinetics demonstrated double contrast in acute but not in chronic infarction in a mouse model of myocardial occlusion reperfusion. NMR IN BIOMEDICINE 2012; 25:489-497. [PMID: 21796712 DOI: 10.1002/nbm.1759] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 04/11/2011] [Accepted: 05/10/2011] [Indexed: 05/31/2023]
Abstract
Manganese (Mn(2+)) is considered as a specific MRI contrast agent that enters viable cardiomyocytes through calcium pathways. Compared to extracellular gadolinium based contrast agents, it has the potential to assess cell viability. To date, only information from the washout phase after recirculation has been used for the detection and characterization of myocardial infarct. This study showed for the first time that in a mouse model of coronary occlusion-reperfusion, Mn(2+) wash-in kinetics are different at 24 h after surgery (acute infarction) than at eight days after surgery (chronic infarction). A fast but transient entry of Mn(2+) into the acute infarct area led to a double contrast between infarct and remote areas, whereas entry of Mn(2+) into the chronic infarct area remained reduced compared to remote regions during both wash-in and washout phases. The main hypothesis is that extracellular space is largely enhanced in acute infarction due to cell membrane rupture and interstitial edema, whereas scar tissue is densely composed of collagen fibers that reduce the distribution volume of free Mn(2+) ions. In addition to its ability to accurately depict the infarct area during the redistribution phase, Mn(2+) is also able to discriminate acute versus chronic injury by the observation of double-contrast kinetics in a mouse model of ischemia reperfusion.
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Affiliation(s)
- Bénédicte M A Delattre
- Division of Radiology, Geneva University Hospital, University of Geneva, Faculty of Medicine, Geneva, Switzerland
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Yang Y, Gervai PD, Sun J, Gruwel ML, Kupriyanov V. Dynamic manganese-enhanced magnetic resonance imaging can detect chronic cryoinjury-induced infarction in pig hearts in vivo. CONTRAST MEDIA & MOLECULAR IMAGING 2011; 6:426-36. [DOI: 10.1002/cmmi.438] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yanmin Yang
- University of Manitoba; Winnipeg; Manitoba; Canada
| | | | - Jiankang Sun
- Institute for Biodiagnostics, NRC; Winnipeg; Manitoba; Canada
| | - Marco L. Gruwel
- Institute for Biodiagnostics, NRC; Winnipeg; Manitoba; Canada
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Dash R, Chung J, Ikeno F, Hahn-Windgassen A, Matsuura Y, Bennett MV, Lyons JK, Teramoto T, Robbins RC, McConnell MV, Yeung AC, Brinton TJ, Harnish PP, Yang PC. Dual manganese-enhanced and delayed gadolinium-enhanced MRI detects myocardial border zone injury in a pig ischemia-reperfusion model. Circ Cardiovasc Imaging 2011; 4:574-82. [PMID: 21719779 DOI: 10.1161/circimaging.110.960591] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Gadolinium (Gd)-based delayed-enhancement MRI (DEMRI) identifies nonviable myocardium but is nonspecific and may overestimate nonviable territory. Manganese (Mn(2+))-enhanced MRI (MEMRI) denotes specific Mn(2+) uptake into viable cardiomyocytes. We performed a dual-contrast myocardial assessment in a porcine ischemia-reperfusion (IR) model to test the hypothesis that combined DEMRI and MEMRI identifies viable infarct border zone (BZ) myocardium in vivo. METHODS AND RESULTS Sixty-minute left anterior descending coronary artery IR injury was induced in 13 adult swine. Twenty-one days post-IR, 3-T cardiac MRI was performed. MEMRI was obtained after injection of 0.7 mL/kg Mn(2+) contrast agent. DEMRI was then acquired after injection of 0.2 mmol/kg Gd. Left ventricular (LV) mass, infarct, and function were analyzed. Subtraction of MEMRI defect from DEMRI signal identified injured BZ myocardium. Explanted hearts were analyzed by 2,3,5-triphenyltetrazolium chloride stain and tissue electron microscopy to compare infarct, BZ, and remote myocardium. Average LV ejection fraction was reduced (30±7%). MEMRI and DEMRI infarct volumes correlated with 2,3,5-triphenyltetrazolium chloride stain analysis (MEMRI, r=0.78; DEMRI, r=0.75; P<0.004). MEMRI infarct volume percentage was significantly lower than that of DEMRI (14±4% versus 23±4%; P<0.05). BZ MEMRI signal-to-noise ratio (SNR) was intermediate to remote and core infarct SNR (7.5±2.8 versus 13.2±3.4 and 2.9±1.6; P<0.0001), and DEMRI BZ SNR tended to be intermediate to remote and core infarct SNR (8.4±5.4 versus 3.3±0.6 and 14.3±6.6; P>0.05). Tissue electron microscopy analysis exhibited preserved cell structure in BZ cardiomyocytes despite transmural DEMRI enhancement. CONCLUSIONS The dual-contrast MEMRI-DEMRI detects BZ viability within DEMRI infarct zones. This approach may identify injured, at-risk myocardium in ischemic cardiomyopathy.
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Affiliation(s)
- Rajesh Dash
- Division of Cardiovascular Medicine, Stanford University Medical Center, Stanford, CA 94305-5233, USA.
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Lefrançois W, Miraux S, Calmettes G, Pourtau L, Franconi JM, Diolez P, Thiaudière E. A fast black-blood sequence for four-dimensional cardiac manganese-enhanced MRI in mouse. NMR IN BIOMEDICINE 2011; 24:291-298. [PMID: 20925127 DOI: 10.1002/nbm.1588] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2009] [Revised: 05/31/2010] [Accepted: 06/12/2010] [Indexed: 05/30/2023]
Abstract
The increasing number of mouse models of cardiac diseases requires improvements in the current MRI tools. Anatomic and functional cardiac phenotyping by MRI calls for both time and space resolution in three dimensions. Black-blood contrast is often needed for the accurate delineation of myocardium and chambers, and is consistent with manganese contrast enhancement. In this article, we propose a fast, three-dimensional, time-resolved (four-dimensional), black-blood MRI sequence that allows mouse heart imaging at 10 periods of the cardiac cycle within 30 min at an isotropic resolution of 200 µm. Two-dimensional imaging was possible within 80 s. Blood cancellation was achieved by employing bipolar gradients without the use of a double inversion recovery preparation scheme. Saturation slices were added in two-dimensional experiments for better blood nulling. The rapidity of the two-dimensional acquisition protocol allowed the measurement of the time course of contrast enhancement on manganese infusion. Owing to the very high contrast-to-noise ratio, manganese-enhanced MRI in four dimensions made possible the accurate assessment of regional cardiac volumes in healthy animals. In experimentally infarcted mice, the size of the ischemic zone could be measured easily with this method. The technique might be valuable in evaluating mouse heart diseases and their follow-up in longitudinal studies.
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Affiliation(s)
- William Lefrançois
- Centre de Résonance Magnétique des Systèmes Biologiques, CNRS/Université Victor Segalen Bordeaux 2, Bordeaux, France
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