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Saha P, Gutmann C, Kingdon J, Dregan A, Bertolaccini L, Grover SP, Patel AS, Modarai B, Lyons O, Schulz C, Andia ME, Phinikaridou A, Botnar RM, Smith A. Venous Thrombosis Accelerates Atherosclerosis in Mice. Circulation 2023; 147:1945-1947. [PMID: 37335825 DOI: 10.1161/circulationaha.123.064268] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
Affiliation(s)
- Prakash Saha
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Cardiovascular and Metabolic Medicine & Sciences (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.S.), King's College London, United Kingdom
| | - Clemens Gutmann
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Cardiovascular and Metabolic Medicine & Sciences (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.S.), King's College London, United Kingdom
- Division of Cardiology, Medical University of Vienna, Austria (C.G.)
| | - Jack Kingdon
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Cardiovascular and Metabolic Medicine & Sciences (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.S.), King's College London, United Kingdom
| | - Alexandru Dregan
- Institute of Psychiatry, Psychology, and Neuroscience, Department of Psychological Medicine (A.D.), King's College London, United Kingdom
| | - Laura Bertolaccini
- School of Cardiovascular and Metabolic Medicine & Sciences (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.S.), King's College London, United Kingdom
| | - Steven P Grover
- University of North Carolina Blood Research Center, Division of Hematology and Oncology, Department of Medicine, University of North Carolina at Chapel Hill (S.P.G.)
| | - Ashish S Patel
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Cardiovascular and Metabolic Medicine & Sciences (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.S.), King's College London, United Kingdom
| | - Bijan Modarai
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Cardiovascular and Metabolic Medicine & Sciences (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.S.), King's College London, United Kingdom
| | - Oliver Lyons
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Cardiovascular and Metabolic Medicine & Sciences (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.S.), King's College London, United Kingdom
- Department of Surgery, University of Otago, Christchurch (O.L.)
| | - Christian Schulz
- Medizinische Klinik und Poliklinik I, Klinikum der Universität München, Ludwig-Maximilians-Universität, Munich, Germany (C.S.)
| | - Marcelo E Andia
- Biomedical Imaging Centre, School of Medicine (M.E.A), Pontificia Universidad Católica de Chile, Santiago, Chile
- Millennium Institute for Intelligent Healthcare Engineering (iHEALTH), Santiago, Chile (M.E.A, R.M.B)
| | - Alkystis Phinikaridou
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Biomedical Engineering and Imaging Sciences (A.P., R.M.B.). King's College London, United Kingdom
| | - René M Botnar
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Biomedical Engineering and Imaging Sciences (A.P., R.M.B.). King's College London, United Kingdom
- School of Engineering (R.M.B.), Pontificia Universidad Católica de Chile, Santiago, Chile
- Institute for Biological and Medical Engineering (R.M.B.), Pontificia Universidad Católica de Chile, Santiago, Chile
- Millennium Institute for Intelligent Healthcare Engineering (iHEALTH), Santiago, Chile (M.E.A, R.M.B)
| | - Alberto Smith
- British Heart Foundation Centre of Research Excellence (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.P., R.M.B., A.S.), King's College London, United Kingdom
- School of Cardiovascular and Metabolic Medicine & Sciences (P.S., C.G., J.K., L.B., A.S.P., B.M., O.L., A.S.), King's College London, United Kingdom
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Lavin B, Eykyn TR, Phinikaridou A, Xavier A, Kumar S, Buqué X, Aspichueta P, Sing-Long C, Arrese M, Botnar RM, Andia ME. Characterization of hepatic fatty acids using magnetic resonance spectroscopy for the assessment of treatment response to metformin in an eNOS -/- mouse model of metabolic nonalcoholic fatty liver disease/nonalcoholic steatohepatitis. NMR Biomed 2023:e4932. [PMID: 36940044 DOI: 10.1002/nbm.4932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 03/08/2023] [Accepted: 03/09/2023] [Indexed: 06/18/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is the leading cause of chronic liver disease worldwide. Liver biopsy remains the gold standard for diagnosis and staging of disease. There is a clinical need for noninvasive diagnostic tools for risk stratification, follow-up, and monitoring treatment response that are currently lacking, as well as preclinical models that recapitulate the etiology of the human condition. We have characterized the progression of NAFLD in eNOS-/- mice fed a high fat diet (HFD) using noninvasive Dixon-based magnetic resonance imaging and single voxel STEAM spectroscopy-based protocols to measure liver fat fraction at 3 T. After 8 weeks of diet intervention, eNOS-/- mice exhibited significant accumulation of intra-abdominal and liver fat compared with control mice. Liver fat fraction measured by 1 H-MRS in vivo showed a good correlation with the NAFLD activity score measured by histology. Treatment of HFD-fed NOS3-/- mice with metformin showed significantly reduced liver fat fraction and altered hepatic lipidomic profile compared with untreated mice. Our results show the potential of in vivo liver MRI and 1 H-MRS to noninvasively diagnose and stage the progression of NAFLD and to monitor treatment response in an eNOS-/- murine model that represents the classic NAFLD phenotype associated with metabolic syndrome.
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Affiliation(s)
- Begoña Lavin
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK
- BHF Centre of Research Excellence, Cardiovascular Division, King's College London, London, UK
- Department of Biochemistry and Molecular Biology, School of Chemistry, Complutense University, Madrid, Spain
| | - Thomas R Eykyn
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK
- BHF Centre of Research Excellence, Cardiovascular Division, King's College London, London, UK
| | - Alkystis Phinikaridou
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK
- BHF Centre of Research Excellence, Cardiovascular Division, King's College London, London, UK
| | - Aline Xavier
- Biomedical Engineering, Faculty of Engineering, Universidad de Santiago de Chile, Santiago, Chile
- ANID - Millennium Science Initiative Program - Millennium Institute Intelligent Healthcare Engineering, Santiago, Chile
| | - Shravan Kumar
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK
| | - Xabier Buqué
- Physiology Department, School of Medicine and Nursing, Universidad del País Vasco UPV/EHU, Vizcaya, Spain
- Biocruces Bizkaia Health Research Institute, Barakaldo, Spain
| | - Patricia Aspichueta
- Physiology Department, School of Medicine and Nursing, Universidad del País Vasco UPV/EHU, Vizcaya, Spain
- Biocruces Bizkaia Health Research Institute, Barakaldo, Spain
- CIBER de enfermedades hepáticas y digestivas (CIBERehd), Spain
| | - Carlos Sing-Long
- ANID - Millennium Science Initiative Program - Millennium Institute Intelligent Healthcare Engineering, Santiago, Chile
- School of Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Marco Arrese
- ANID - Millennium Science Initiative Program - Millennium Institute Intelligent Healthcare Engineering, Santiago, Chile
- Gastroenterology Department, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - René M Botnar
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK
- BHF Centre of Research Excellence, Cardiovascular Division, King's College London, London, UK
- ANID - Millennium Science Initiative Program - Millennium Institute Intelligent Healthcare Engineering, Santiago, Chile
- School of Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Marcelo E Andia
- ANID - Millennium Science Initiative Program - Millennium Institute Intelligent Healthcare Engineering, Santiago, Chile
- School of Medicine and Centro de Envejecimiento y Regeneración (CARE), Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
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3
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Bravo L, Pereyra KV, Diaz HS, Flores M, Schwarz KG, Toledo C, Díaz-Jara E, González L, Andia ME, Del Rio R. Enhanced Peripheral Chemoreflex Drive Is Associated with Cardiorespiratory Disorders in Mice with Coronary Heart Disease. Adv Exp Med Biol 2023; 1427:99-106. [PMID: 37322340 DOI: 10.1007/978-3-031-32371-3_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Coronary heart disease (CHD) is a prevalent cardiovascular disease characterized by coronary artery blood flow reductions caused by lipid deposition and oxidation within the coronary arteries. Dyslipidemia is associated with local tissue damage by oxidative stress/inflammation and carotid bodies (CB) peripheral chemoreceptors are heavily modulated by both reactive oxygen species and pro-inflammatory molecules (i.e., cytokines). Despite this, it is not know whether CB-mediated chemoreflex drive may be affected in CHD. In the present study, we evaluated peripheral CB-mediated chemoreflex drive, cardiac autonomic function, and the incidence of breathing disorders in a murine model of CHD. Compared to age-matched control mice, CHD mice showed enhanced CB-chemoreflex drive (twofold increase in the hypoxic ventilatory response), cardiac sympathoexcitation, and irregular breathing disorders. Remarkably, all these were closely linked to the enhanced CB-mediated chemoreflex drive. Our results showed that mice with CHD displayed an enhanced CB chemoreflex, sympathoexcitation, and disordered breathing and suggest that CBs may be involved in chronic cardiorespiratory alterations in the setting of CHD.
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Affiliation(s)
- Liena Bravo
- Laboratory of Cardiorespiratory Control, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Katherin V Pereyra
- Laboratory of Cardiorespiratory Control, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Hugo S Diaz
- Laboratory of Cardiorespiratory Control, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Mariajosé Flores
- Laboratory of Cardiorespiratory Control, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Karla G Schwarz
- Laboratory of Cardiorespiratory Control, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Camilo Toledo
- Laboratory of Cardiorespiratory Control, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Esteban Díaz-Jara
- Laboratory of Cardiorespiratory Control, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Leticia González
- Radiology Department & ANID - Millennium Institute for Intelligent Healthcare Engineering - iHEALTH, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Marcelo E Andia
- Radiology Department & ANID - Millennium Institute for Intelligent Healthcare Engineering - iHEALTH, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Rodrigo Del Rio
- Laboratory of Cardiorespiratory Control, Pontificia Universidad Católica de Chile, Santiago, Chile.
- Centro de Excelencia en Biomedicina de Magallanes (CEBIMA), Universidad de Magallanes, Punta Arenas, Chile.
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Ramos-Zaldívar HM, Polakovicova I, Salas-Huenuleo E, Corvalán AH, Kogan MJ, Yefi CP, Andia ME. Extracellular vesicles through the blood-brain barrier: a review. Fluids Barriers CNS 2022; 19:60. [PMID: 35879759 PMCID: PMC9310691 DOI: 10.1186/s12987-022-00359-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 07/15/2022] [Indexed: 02/08/2023] Open
Abstract
Extracellular vesicles (EVs) are particles naturally released from cells that are delimited by a lipid bilayer and are unable to replicate. How the EVs cross the Blood–Brain barrier (BBB) in a bidirectional manner between the bloodstream and brain parenchyma remains poorly understood. Most in vitro models that have evaluated this event have relied on monolayer transwell or microfluidic organ-on-a-chip techniques that do not account for the combined effect of all cellular layers that constitute the BBB at different sites of the Central Nervous System. There has not been direct transcytosis visualization through the BBB in mammals in vivo, and evidence comes from in vivo experiments in zebrafish. Literature is scarce on this topic, and techniques describing the mechanisms of EVs motion through the BBB are inconsistent. This review will focus on in vitro and in vivo methodologies used to evaluate EVs transcytosis, how EVs overcome this fundamental structure, and discuss potential methodological approaches for future analyses to clarify these issues. Understanding how EVs cross the BBB will be essential for their future use as vehicles in pharmacology and therapeutics.
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Affiliation(s)
- Héctor M Ramos-Zaldívar
- Doctoral Program in Medical Sciences, Faculty of Medicine, Pontificia Universidad Catolica de Chile, Santiago de Chile, Chile.
| | - Iva Polakovicova
- Advanced Center for Chronic Diseases, Santiago, Chile.,Department of Hematology and Oncology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Alejandro H Corvalán
- Advanced Center for Chronic Diseases, Santiago, Chile.,Department of Hematology and Oncology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Marcelo J Kogan
- Advanced Center for Chronic Diseases, Santiago, Chile.,Departamento de Química Farmacológica Y Toxicológica, Facultad de Ciencias Químicas Y Farmacéuticas, Laboratorio de Nanobiotecnología, Universidad de Chile, Carlos Lorca 964, Independencia, Chile
| | - Claudia P Yefi
- Escuela de Medicina Veterinaria, Facultad de Agronomía E Ingeniería Forestal, Facultad de Ciencias Biológicas Y Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Marcelo E Andia
- Biomedical Imaging Center, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.,Millennium Institute for Intelligent Healthcare Engineering, Santiago, Chile
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Lavin B, Andia ME, Saha P, Botnar RM, Phinikaridou A. Quantitative MRI of Endothelial Permeability and (Dys)function in Atherosclerosis. J Vis Exp 2021. [PMID: 34978293 DOI: 10.3791/62724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Cardiovascular diseases are the leading causes of death worldwide. A permeable/leaky and dysfunctional endothelium is considered the earliest marker of vascular damage and thought to drive atherosclerosis. A method to identify these changes in vivo would be desirable in the clinic. Magnetic resonance imaging (MRI)-based tools and other technologies have enabled a profound understanding of the role of the endothelium in cardiovascular diseases and risk in vivo. There is, however, a need for reproducible and simple approaches for extracting quantifiable data reflective of endothelial damage from a single imaging study. A non-invasive, easy-to-implement, and quantitative MRI workflow was developed to acquire and analyze images that allow the quantification of two imaging biomarkers of arterial endothelial damage (leakiness/permeability and dysfunction). Here, the protocol describes the application of this method in the brachiocephalic artery of atherosclerotic ApoE-/- mice using a clinical MRI scanner. First, late gadolinium enhancement (LGE) and Modified Look-Locker Inversion Recovery (MOLLI) T1 mapping protocols to quantify endothelial leakage using an albumin-binding probe are described. Second, anatomic, and quantitative blood flow sequences to measure endothelial dysfunction, in response to acetylcholine are described. Importantly, the method outlined here allows the acquisition of high-spatial-resolution 3D images with large volumetric coverage enabling accurate segmentation of vessel wall structures to improve inter- and intra-observer variability and to increase reliability and reproducibility. Additionally, it provides quantitative data without the need for high-temporal resolution for complex kinetic modeling, making it model-independent and even allowing for imaging of highly mobile vessels (coronary arteries). Therefore, the approach simplifies and expedites data analysis. Finally, this method can be implemented on different scanners, can be extended to image different arterial beds, and is clinically applicable for use in humans. This method could be used to diagnose and treat patients with atherosclerosis by adopting a precision-medicine approach.
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Affiliation(s)
- Begoña Lavin
- School of Biomedical Engineering and Imaging Sciences, King's College London; BHF Centre of Excellence, Cardiovascular Division, King's College London; Biochemistry and Molecular Biology Department, School of Chemistry, Complutense University
| | - Marcelo E Andia
- School of Biomedical Engineering and Imaging Sciences, King's College London; Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile; ANID - Millennium Science Initiative Program - Millennium Nucleus for Cardiovascular Magnetic Resonance
| | - Prakash Saha
- Academic Department of Vascular Surgery, Cardiovascular Division, King's College London
| | - René M Botnar
- School of Biomedical Engineering and Imaging Sciences, King's College London; BHF Centre of Excellence, Cardiovascular Division, King's College London; Wellcome Trust and EPSRC Medical Engineering Center, King's College London; Escuela de Ingeniería, Universidad Católica de Chile
| | - Alkystis Phinikaridou
- School of Biomedical Engineering and Imaging Sciences, King's College London; BHF Centre of Excellence, Cardiovascular Division, King's College London;
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Bridi R, Lino von Poser G, Gómez M, Andia ME, Oyarzún JE, Núñez P, Vasquez Arias AJ, Espinosa-Bustos C. Hepatoprotective species from the Chilean medicinal flora: Junellia spathulata (Verbenaceae). J Ethnopharmacol 2021; 267:113543. [PMID: 33152429 DOI: 10.1016/j.jep.2020.113543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/22/2020] [Accepted: 10/29/2020] [Indexed: 06/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Chilean population relies on medicinal plants for treating a wide range of illnesses, especially those of the gastrointestinal system. Junellia spathulata (Gillies & Hook.) Moldenke var. spathulata (Verbenaceae), called as "verbena-azul-de-cordilleira", is a medicinal plant native to Argentina and Chile traditionally used for treating digestive disorders. Although the species of the genus are important as therapeutic resources for the Andean population, the plants are very scarcely studied. AIMS OF THE STUDY The purpose of the present study was to find out the main constituents and investigate the protective effect of J. spathulata against oxidative stress induced by the potent oxidant 2,2'-azobis (2-amidinopropane) dihydrochloride (AAPH) in human hepatoblastoma cells. MATERIALS AND METHODS The crude methanol extract of J. spathulata and an iridoid obtained by chromatographic processes were tested to access the hepatoprotective effect and cytotoxicity in HepG2 cell. In addition, the reducing power of the samples and their ability to scavenge free radicals were evaluated using FRAP and ORAC assay systems. RESULTS The iridoid asperuloside, the main compound of the crude methanol extract of J. spathulata, was isolated and identified by means of NMR analysis. The crude methanol extract of J. spathulata and asperuloside protected HepG2 cells against oxidative damage triggered by AAPH-derived free radicals. This effect can be credited to the ability of the extract and asperuloside to protect the liver cells from chemical-induced injury, which might be correlated to their free radical scavenging potential. CONCLUSIONS This study experimentally evidenced the ethnopharmacological usefulness of J. spathulata as a treatment of digestive disorders. Our result could stimulate further investigations of hepatoprotective agents in other Chilean Junellia species.
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Affiliation(s)
- Raquel Bridi
- Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago, 702843, Chile.
| | - Gilsane Lino von Poser
- Departamento de Produção de Matéria-Prima, Faculdade de Farmácia - UFRGS, Porto Alegre, Brazil
| | - Miguel Gómez
- Departamento de Ciencias Vegetales, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Chile
| | - Marcelo E Andia
- Departamento de Radiología y Centro de Imágenes Biomédicas, Facultad de Medicina, Pontificia Universidad Católica de Chile, Chile; Millennium Nucleus for Cardiovascular Magnetic Resonance, Santiago, Chile
| | - Juan Esteban Oyarzún
- Departamento de Radiología y Centro de Imágenes Biomédicas, Facultad de Medicina, Pontificia Universidad Católica de Chile, Chile; Millennium Nucleus for Cardiovascular Magnetic Resonance, Santiago, Chile
| | - Paula Núñez
- Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago, 702843, Chile
| | - Ariadsna Jael Vasquez Arias
- Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago, 702843, Chile
| | - Christian Espinosa-Bustos
- Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago, 702843, Chile
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Arrieta C, Sing-Long CA, Mura J, Irarrazaval P, Andia ME, Uribe S, Tejos C. Level set segmentation with shape prior knowledge using intrinsic rotation, translation and scaling alignment. Biomed Signal Process Control 2021. [DOI: 10.1016/j.bspc.2020.102241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Lavin B, Lacerda S, Andia ME, Lorrio S, Bakewell R, Smith A, Rashid I, Botnar RM, Phinikaridou A. Tropoelastin: an in vivo imaging marker of dysfunctional matrix turnover during abdominal aortic dilation. Cardiovasc Res 2020; 116:995-1005. [PMID: 31282949 PMCID: PMC7104357 DOI: 10.1093/cvr/cvz178] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 07/05/2019] [Indexed: 12/15/2022] Open
Abstract
Aims Dysfunctional matrix turnover is present at sites of abdominal aortic aneurysm (AAA) and leads to the accumulation of monomeric tropoelastin rather than cross-linked elastin. We used a gadolinium-based tropoelastin-specific magnetic resonance contrast agent (Gd-TESMA) to test whether quantifying regional tropoelastin turnover correlates with aortic expansion in a murine model. The binding of Gd-TESMA to excised human AAA was also assessed. Methods and results We utilized the angiotensin II (Ang II)-infused apolipoprotein E gene knockout (ApoE-/-) murine model of aortic dilation and performed in vivo imaging of tropoelastin by administering Gd-TESMA followed by late gadolinium enhancement (LGE) magnetic resonance imaging (MRI) and T1 mapping at 3 T, with subsequent ex vivo validation. In a cross-sectional study (n = 66; control = 11, infused = 55) we found that Gd-TESMA enhanced MRI was elevated and confined to dilated aortic segments (control: LGE=0.13 ± 0.04 mm2, control R1= 1.1 ± 0.05 s-1 vs. dilated LGE=1.0 ± 0.4 mm2, dilated R1 =2.4 ± 0.9 s-1) and was greater in segments with medium (8.0 ± 3.8 mm3) and large (10.4 ± 4.1 mm3) compared to small (3.6 ± 2.1 mm3) vessel volume. Furthermore, a proof-of-principle longitudinal study (n = 19) using Gd-TESMA enhanced MRI demonstrated a greater proportion of tropoelastin: elastin expression in dilating compared to non-dilating aortas, which correlated with the rate of aortic expansion. Treatment with pravastatin and aspirin (n = 10) did not reduce tropoelastin turnover (0.87 ± 0.3 mm2 vs. 1.0 ± 0.44 mm2) or aortic dilation (4.86 ± 2.44 mm3 vs. 4.0 ± 3.6 mm3). Importantly, Gd-TESMA-enhanced MRI identified accumulation of tropoelastin in excised human aneurysmal tissue (n = 4), which was confirmed histologically. Conclusion Tropoelastin MRI identifies dysfunctional matrix remodelling that is specifically expressed in regions of aortic aneurysm or dissection and correlates with the development and rate of aortic expansion. Thus, it may provide an additive imaging marker to the serial assessment of luminal diameter for surveillance of patients at risk of or with established aortopathy.
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Affiliation(s)
- Begoña Lavin
- School of Biomedical Engineering and Imaging Sciences, Department of Biomedical Engineering, King's College London, 3rd Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK.,Cardiovascular Division, BHF Centre of Excellence, King's College London, London, UK
| | - Sara Lacerda
- School of Biomedical Engineering and Imaging Sciences, Department of Biomedical Engineering, King's College London, 3rd Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK.,Cardiovascular Division, BHF Centre of Excellence, King's College London, London, UK.,Centre de Biophysique Moléculaire, CNRS, Orléans, France
| | - Marcelo E Andia
- School of Biomedical Engineering and Imaging Sciences, Department of Biomedical Engineering, King's College London, 3rd Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK.,Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Silvia Lorrio
- School of Biomedical Engineering and Imaging Sciences, Department of Biomedical Engineering, King's College London, 3rd Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK.,Cardiovascular Division, BHF Centre of Excellence, King's College London, London, UK
| | - Robert Bakewell
- School of Biomedical Engineering and Imaging Sciences, Department of Biomedical Engineering, King's College London, 3rd Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
| | - Alberto Smith
- Cardiovascular Division, Academic Department of Vascular Surgery, King's College London, London, UK
| | - Imran Rashid
- School of Biomedical Engineering and Imaging Sciences, Department of Biomedical Engineering, King's College London, 3rd Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
| | - René M Botnar
- School of Biomedical Engineering and Imaging Sciences, Department of Biomedical Engineering, King's College London, 3rd Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK.,Cardiovascular Division, BHF Centre of Excellence, King's College London, London, UK.,Wellcome Trust and EPSRC Medical Engineering Center, King's College London, London, UK.,Pontificia Universidad Católica de Chile, Escuela de Ingeniería, Santiago, Chile
| | - Alkystis Phinikaridou
- School of Biomedical Engineering and Imaging Sciences, Department of Biomedical Engineering, King's College London, 3rd Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK.,Cardiovascular Division, BHF Centre of Excellence, King's College London, London, UK
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9
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Xavier A, Arteaga de Castro C, Andia ME, Luijten PR, Klomp DW, Fillmer A, Prompers JJ. Metabolite cycled liver 1 H MRS on a 7 T parallel transmit system. NMR Biomed 2020; 33:e4343. [PMID: 32515151 PMCID: PMC7379278 DOI: 10.1002/nbm.4343] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 05/08/2020] [Accepted: 05/12/2020] [Indexed: 05/03/2023]
Abstract
INTRODUCTION Single-voxel 1 H MRS in body applications often suffers from respiratory and other motion induced phase and frequency shifts, which lead to incoherent averaging and hence to suboptimal results. METHODS Here we show the application of metabolite cycling (MC) for liver STEAM-localized 1 H MRS on a 7 T parallel transmit system, using eight transmit-receive fractionated dipole antennas with 16 additional, integrated receive loops. MC-STEAM measurements were made in six healthy, lean subjects and compared with STEAM measurements using VAPOR water suppression. Measurements were performed during free breathing and during synchronized breathing, for which the subjects did breathe in between the MRS acquisitions. Both intra-session repeatability and inter-session reproducibility of liver lipid quantification with MC-STEAM and VAPOR-STEAM were determined. RESULTS The preserved water signal in MC-STEAM allowed for robust phase and frequency correction of individual acquisitions before averaging, which resulted in in vivo liver spectra that were of equal quality when measurements were made with free breathing or synchronized breathing. Intra-session repeatability and inter-session reproducibility of liver lipid quantification were better for MC-STEAM than for VAPOR-STEAM. This may also be explained by the more robust phase and frequency correction of the individual MC-STEAM acquisitions as compared with the VAPOR-STEAM acquisitions, for which the low-signal-to-noise ratio lipid signals had to be used for the corrections. CONCLUSION Non-water-suppressed MC-STEAM on a 7 T system with parallel transmit is a promising approach for 1 H MRS applications in the body that are affected by motion, such as in the liver, and yields better repeatability and reproducibility compared with water-suppressed measurements.
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Affiliation(s)
- Aline Xavier
- Department of Radiology, Imaging DivisionUniversity Medical Center UtrechtUtrechtThe Netherlands
- Biomedical Imaging Center, Pontificia Universidad Católica de ChileSantiagoChile
- Millennium Nucleus for Cardiovascular Magnetic ResonanceSantiagoChile
| | | | - Marcelo E. Andia
- Biomedical Imaging Center, Pontificia Universidad Católica de ChileSantiagoChile
- Millennium Nucleus for Cardiovascular Magnetic ResonanceSantiagoChile
| | - Peter R. Luijten
- Department of Radiology, Imaging DivisionUniversity Medical Center UtrechtUtrechtThe Netherlands
| | - Dennis W. Klomp
- Department of Radiology, Imaging DivisionUniversity Medical Center UtrechtUtrechtThe Netherlands
| | - Ariane Fillmer
- Department of Radiology, Imaging DivisionUniversity Medical Center UtrechtUtrechtThe Netherlands
- Physikalisch‐Technische Bundesanstalt (PTB)BerlinGermany
| | - Jeanine J. Prompers
- Department of Radiology, Imaging DivisionUniversity Medical Center UtrechtUtrechtThe Netherlands
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10
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Lavin Plaza B, Phinikaridou A, Andia ME, Potter M, Lorrio S, Rashid I, Botnar RM. Sustained Focal Vascular Inflammation Accelerates Atherosclerosis in Remote Arteries. Arterioscler Thromb Vasc Biol 2020; 40:2159-2170. [PMID: 32673527 PMCID: PMC7447189 DOI: 10.1161/atvbaha.120.314387] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Evidence from preclinical and clinical studies has demonstrated that myocardial infarction promotes atherosclerosis progression. The impact of focal vascular inflammation on the progression and phenotype of remote atherosclerosis remains unknown. Approach and Results: We used a novel ApoE-/- knockout mouse model of sustained arterial inflammation, initiated by mechanical injury in the abdominal aorta. Using serial in vivo molecular MRI and ex vivo histology and flow cytometry, we demonstrate that focal arterial inflammation triggered by aortic injury, accelerates atherosclerosis in the remote brachiocephalic artery. The brachiocephalic artery atheroma had distinct histological features including increased plaque size, plaque permeability, necrotic core to collagen ratio, infiltration of more inflammatory monocyte subsets, and reduced collagen content. We also found that arterial inflammation following focal vascular injury evoked a prolonged systemic inflammatory response manifested as a persistent increase in serum IL-6 (interleukin 6). Finally, we demonstrate that 2 therapeutic interventions-pravastatin and minocycline-had distinct anti-inflammatory effects at the plaque and systemic level. CONCLUSIONS We show for the first time that focal arterial inflammation in response to vascular injury enhances systemic vascular inflammation, accelerates remote atheroma progression and induces plaques more inflamed, lipid-rich, and collagen-poor in the absence of ischemic myocardial injury. This inflammatory cascade is modulated by pravastatin and minocycline treatments, which have anti-inflammatory effects at both plaque and systemic levels that mitigate atheroma progression.
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Affiliation(s)
- Begoña Lavin Plaza
- From the School of Biomedical Engineering and Imaging Sciences, King's College London, United Kingdom (B.L.P., A.P., M.P., S.L., I.R., R.M.B.)
| | - Alkystis Phinikaridou
- From the School of Biomedical Engineering and Imaging Sciences, King's College London, United Kingdom (B.L.P., A.P., M.P., S.L., I.R., R.M.B.)
| | - Marcelo E Andia
- Radiology Department & Millennium Nucleus for Cardiovascular Magnetic Resonance (M.E.A.), Pontificia Universidad Católica de Chile
| | - Myles Potter
- From the School of Biomedical Engineering and Imaging Sciences, King's College London, United Kingdom (B.L.P., A.P., M.P., S.L., I.R., R.M.B.)
| | - Silvia Lorrio
- From the School of Biomedical Engineering and Imaging Sciences, King's College London, United Kingdom (B.L.P., A.P., M.P., S.L., I.R., R.M.B.)
| | - Imran Rashid
- From the School of Biomedical Engineering and Imaging Sciences, King's College London, United Kingdom (B.L.P., A.P., M.P., S.L., I.R., R.M.B.).,Case Cardiovascular Research Institute, Case Western Reserve University, Cleveland, OH (I.R.)
| | - Rene M Botnar
- From the School of Biomedical Engineering and Imaging Sciences, King's College London, United Kingdom (B.L.P., A.P., M.P., S.L., I.R., R.M.B.).,Escuela de Ingeniería (R.M.B.), Pontificia Universidad Católica de Chile
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11
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Arrieta C, Urrutia J, Besa P, Montalba C, Lafont N, Andia ME, Uribe S. Automatic quantification of fat infiltration in paraspinal muscles using T2-weighted images: An OsiriX application. Biomed Signal Process Control 2020. [DOI: 10.1016/j.bspc.2019.101793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Xavier A, Zacconi F, Gainza C, Cabrera D, Arrese M, Uribe S, Sing-Long C, Andia ME. Intrahepatic fatty acids composition as a biomarker of NAFLD progression from steatosis to NASH by using1H-MRS. RSC Adv 2019; 9:42132-42139. [PMID: 35542850 PMCID: PMC9076551 DOI: 10.1039/c9ra08914d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 12/10/2019] [Indexed: 12/30/2022] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is the most common liver disease in the world and it is becoming one of the most frequent cause of liver transplantation. Unfortunately, the only available method that can reliably determine the stage of this disease is liver biopsy, however, it is invasive and risky for patients. The purpose of this study is to investigate changes in the intracellular composition of the liver fatty acids during the progression of the NAFLD in a mouse model fed with Western diet, with the aim of identify non-invasive biomarkers of NAFLD progression based in 1H-MRS. Our results showed that the intracellular liver fatty acid composition changes as NAFLD progresses from simple steatosis to steatohepatitis (NASH). Using principal component analysis with a clustering method, it was possible to identify the three most relevant clinical groups: normal, steatosis and NASH by using 1H-MRS. These results showed a good agreement with the results obtained by GC-MS and histology. Our results suggest that it would be possible to detect the progression of simple steatosis to NASH using 1H-MRS, that has the potential to be used routinely in clinical application for screening high-risk patients. Our results suggest that it would be possible to detect the progression of simple steatosis to NASH using 1H-MRS.![]()
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Affiliation(s)
- Aline Xavier
- Biomedical Imaging Center
- Pontificia Universidad Católica de Chile
- Chile
- Millennium Nucleus for Cardiovascular Magnetic Resonance
- Chile
| | - Flavia Zacconi
- Faculty of Chemistry and Pharmacy
- Pontificia Universidad Católica de Chile
- Chile
- Research Center for Nanotechnology and Advanced Materials CIEN-UC
- Pontificia Univesidad Católica de Chile
| | - Constanza Gainza
- Institute for Mathematical and Computational Engineering
- Pontificia Universidad Católica de Chile
- Chile
| | - Daniel Cabrera
- Gastroenterology Department
- School of Medicine
- Pontificia Universidad Católica de Chile
- Chile
- Department of Chemical and Biological Sciences
| | - Marco Arrese
- Gastroenterology Department
- School of Medicine
- Pontificia Universidad Católica de Chile
- Chile
| | - Sergio Uribe
- Biomedical Imaging Center
- Pontificia Universidad Católica de Chile
- Chile
- Millennium Nucleus for Cardiovascular Magnetic Resonance
- Chile
| | - Carlos Sing-Long
- Biomedical Imaging Center
- Pontificia Universidad Católica de Chile
- Chile
- Millennium Nucleus for Cardiovascular Magnetic Resonance
- Chile
| | - Marcelo E. Andia
- Biomedical Imaging Center
- Pontificia Universidad Católica de Chile
- Chile
- Millennium Nucleus for Cardiovascular Magnetic Resonance
- Chile
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13
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Ramos IT, Henningsson M, Nezafat M, Lavin B, Lorrio S, Gebhardt P, Protti A, Eykyn TR, Andia ME, Flögel U, Phinikaridou A, Shah AM, Botnar RM. Simultaneous Assessment of Cardiac Inflammation and Extracellular Matrix Remodeling after Myocardial Infarction. Circ Cardiovasc Imaging 2018; 11:e007453. [PMID: 30524648 PMCID: PMC6277008 DOI: 10.1161/circimaging.117.007453] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 08/04/2018] [Indexed: 01/25/2023]
Abstract
Background Optimal healing of the myocardium following myocardial infarction (MI) requires a suitable degree of inflammation and its timely resolution, together with a well-orchestrated deposition and degradation of extracellular matrix (ECM) proteins. Methods and Results MI and SHAM-operated animals were imaged at 3,7,14 and 21 days with 3T magnetic resonance imaging (MRI) using a 19F/1H surface coil. Mice were injected with 19F-perfluorocarbon (PFC) nanoparticles to study inflammatory cell recruitment, and with a gadolinium-based elastin-binding contrast agent (Gd-ESMA) to evaluate elastin content. 19F MRI signal co-localized with infarction areas, as confirmed by late-gadolinium enhancement, and was highest 7days post-MI, correlating with macrophage content (MAC-3 immunohistochemistry) (ρ=0.89,P<0.0001). 19F quantification with in vivo (MRI) and ex vivo nuclear magnetic resonance (NMR) spectroscopy correlated linearly (ρ=0.58,P=0.020). T1 mapping after Gd-ESMA injection showed increased relaxation rate (R1) in the infarcted regions and was significantly higher at 21days compared with 7days post-MI (R1[s-1]:21days=2.8 [IQR,2.69-3.30] vs 7days=2.3 [IQR,2.12-2.5], P<0.05), which agreed with an increased tropoelastin content (ρ=0.89, P<0.0001). The predictive value of each contrast agent for beneficial remodeling was evaluated in a longitudinal proof-of-principle study. Neither R1 nor 19F at day 7 were significant predictors for beneficial remodeling (P=0.68;P=0.062). However, the combination of both measurements (R1<2.34Hz and 0.55≤19F≤1.85) resulted in an odds ratio of 30.0 (CI95%:1.41-638.15;P=0.029) for favorable post-MI remodeling. Conclusions Multinuclear 1H/19F MRI allows the simultaneous assessment of inflammation and elastin remodeling in a murine MI model. The interplay of these biological processes affects cardiac outcome and may have potential for improved diagnosis and personalized treatment.
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Affiliation(s)
- Isabel T Ramos
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- School of Cardiovascular Medicine and Sciences, King's College London British Heart Foundation Centre of Excellence, London, United Kingdom
| | - Markus Henningsson
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
| | - Maryam Nezafat
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
| | - Begoña Lavin
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- School of Cardiovascular Medicine and Sciences, King's College London British Heart Foundation Centre of Excellence, London, United Kingdom
| | - Silvia Lorrio
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- School of Cardiovascular Medicine and Sciences, King's College London British Heart Foundation Centre of Excellence, London, United Kingdom
| | - Pierre Gebhardt
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- Department of Physics of Molecular Imaging Systems, Institute for Experimental Molecular Imaging, RWTH Aachen University, Aachen, Germany
| | - Andrea Protti
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
| | - Thomas R Eykyn
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
| | - Marcelo E Andia
- Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | - Ulrich Flögel
- Department of Molecular Cardiology, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - Alkystis Phinikaridou
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- School of Cardiovascular Medicine and Sciences, King's College London British Heart Foundation Centre of Excellence, London, United Kingdom
| | - Ajay M Shah
- School of Cardiovascular Medicine and Sciences, King's College London British Heart Foundation Centre of Excellence, London, United Kingdom
| | - René M Botnar
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom
- Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Santiago, Chile
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14
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Lavin B, Phinikaridou A, Andia ME, Rashid I, Potter M, Botnar RM. P18 PRAVASTATIN AND MINOCYCLINE TREATMENT AFFECTS VESSEL WALL REMODELING IN A MURINE MODEL OF VASCULAR INJURY. Cardiovasc Res 2018. [DOI: 10.1093/cvr/cvy216.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- B Lavin
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
| | - A Phinikaridou
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
| | - M E Andia
- Radiology Department & Biomedical Imaging Centre, Pontificia Universidad Católica de Chile
| | - I Rashid
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
| | - M Potter
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
| | - René M Botnar
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
- Radiology Department & Biomedical Imaging Centre, Pontificia Universidad Católica de Chile
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15
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Lavin B, Phinikaridou A, Andia ME, Rashid I, Potter M, Botnar RM. P17 FOCAL VASCULAR INJURY CAUSES SUSTAINED REMOTE ENDOTHELIAL DYSFUNCTION AND ATHEROSCLEROTIC PLAQUE PROGRESSION: AN IN VIVO MURINE MRI STUDY. Cardiovasc Res 2018. [DOI: 10.1093/cvr/cvy216.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- B Lavin
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
| | - A Phinikaridou
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
| | - M E Andia
- Radiology Department & Biomedical Imaging Centre, Pontificia Universidad Católica de Chile
| | - I Rashid
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
| | - M Potter
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
| | - R M Botnar
- School of Biomedical Engineering and Imaging Sciences, King’s College London, UK
- Radiology Department & Biomedical Imaging Centre, Pontificia Universidad Católica de Chile
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16
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Abstract
Background Elastolysis and ineffective elastogenesis favor the accumulation of tropoelastin, rather than cross-linked elastin, in atherosclerotic plaques. We developed gadolinium-labeled tropoelastin-specific magnetic resonance contrast agents (Gd-TESMAs) for tropoelastin imaging in animal models. Methods and Results Two peptides, VVGSPSAQDEASPLS and YPDHVQYTHY were selected to target tropoelastin. In vitro binding, relaxivity, and biodistribution experiments enabled characterization of the probes and selecting the best candidate for in vivo MRI. MRI was performed in atherosclerotic apolipoprotein E-deficient (ApoE-/-) mice and New Zealand white rabbits with stable and rupture-prone plaques using Gd-TESMA. Additionally, human carotid endarterectomy specimens were imaged ex vivo. The VVGSPSAQDEASPLS-based probe discriminated between tropoelastin and cross-linked elastin (64±7% vs 1±2%, P=0.001), had high in vitro relaxivity in solution (r1-free=11.7±0.6mM-1s-1, r1-bound to tropoelastin = 44±1mM-1s-1) and favorable pharmacokinetics. In vivo mice vascular enhancement (4wks=0.13±0.007mm2, 8wks=0.22±0.01mm2, 12wks=0.33±0.01mm2, P<0.001) and R1 relaxation rate (4wks=0.90±0.01 s-1, 8wks=1.40±0.03 s-1, 12wks=1.87±0.04s-1, P<0.001) increased with atherosclerosis progression after Gd-TESMA injection. Conversely, statin-treated (0.13±0.01mm2, R1 =1.37±0.03s-1) and control (0.10±0.005mm2, R1 =0.87±0.05s-1) mice showed less enhancement. Rupture-prone rabbit plaques had higher R1 relaxation rate compared with stale plaques (R1=2.26±0.1s-1vs R1=1.43±0.02s-1, P=0.001), after administration of Gd-TESMA that allowed detection of rupture-prone plaques with high sensitivity (84.4%) and specificity (92.3%). Increased vascular R1 relaxation rate was observed in carotid endarterectomy plaques after soaking (R1pre= 1.1±0.26 s-1 vs R1post= 3.0±0.1s-1, P=0.01). Ex vivo analyses confirmed the MRI findings and showed uptake of the contrast agent to be specific for tropoelastin. Conclusions MRI of tropoelastin provides a novel biomarker for atherosclerotic plaque progression and instability.
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Affiliation(s)
- Alkystis Phinikaridou
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK.,BHF Centre of Excellence, Cardiovascular Division, King's College London, London, UK
| | - Sara Lacerda
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK.,BHF Centre of Excellence, Cardiovascular Division, King's College London, London, UK
| | - Begoña Lavin
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK.,BHF Centre of Excellence, Cardiovascular Division, King's College London, London, UK
| | - Marcelo E Andia
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK.,Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alberto Smith
- Academic Department of Vascular Surgery, Cardiovascular Division, King's College London, London, UK
| | - Prakash Saha
- Academic Department of Vascular Surgery, Cardiovascular Division, King's College London, London, UK
| | - René M Botnar
- School of Biomedical Engineering Imaging Sciences, King's College London, London, UK.,BHF Centre of Excellence, Cardiovascular Division, King's College London, London, UK.,Wellcome Trust and EPSRC Medical Engineering Center, King's College London, UK.,Pontificia Universidad Católica de Chile, Escuela de Ingeniería, Santiago, Chile
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17
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Navarro ME, Razmilic D, Araos I, Rodrigo A, Andia ME. [Contrast-enhanced spectral mammography. Experience in 465 examinations]. Rev Med Chil 2018; 146:141-149. [PMID: 29999149 DOI: 10.4067/s0034-98872018000200141] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 02/07/2018] [Indexed: 11/17/2022]
Abstract
BACKGROUND Contrast-enhanced spectral mammography or "contrast mammography" has a better cost effectiveness than breast magnetic resonance for confirmation of suspicious lesions detected on breast screening programs. AIM To report the experience of a single center in Santiago. MATERIAL AND METHODS All patients referred for contrast mammography between July 2015 and October 2017 were studied. We recorded the patient risk factors for breast cancer. In 85 patients with suspicious lesions, biopsy results were available. RESULTS We analyzed 465 contrast mammographies. The most common clinical indications were suspicion of cancer and previous inconclusive studies. Mass type lesions were detected in 33% of the studies. Non-mass-type lesions were observed in 10% of cases and findings compatible with papillomatosis in 2%. Fifty five percent of the studies had no visible lesions. In the 85 patients with a pathological study of the biopsy, the sensitivity of the contrast mammography was 100%, with a diagnostic accuracy of 85%, positive and negative predictive values of 82 and 100% respectively. CONCLUSIONS Contrast mammography can be of great use for the assessment of patients with an altered conventional mammography, before indicating a magnetic resonance imaging or a percutaneous biopsy.
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Affiliation(s)
- María E Navarro
- Departamento de Radiología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Dravna Razmilic
- Departamento de Radiología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Isabel Araos
- Departamento de Radiología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Andrés Rodrigo
- Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Marcelo E Andia
- Departamento de Radiología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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18
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Montalba C, Urbina J, Sotelo J, Andia ME, Tejos C, Irarrazaval P, Hurtado DE, Valverde I, Uribe S. Variability of 4D flow parameters when subjected to changes in MRI acquisition parameters using a realistic thoracic aortic phantom. Magn Reson Med 2017; 79:1882-1892. [DOI: 10.1002/mrm.26834] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 06/02/2017] [Accepted: 06/19/2017] [Indexed: 01/28/2023]
Affiliation(s)
- Cristian Montalba
- Biomedical Imaging CenterPontificia Universidad Católica de ChileSantiago Chile
| | - Jesus Urbina
- Biomedical Imaging CenterPontificia Universidad Católica de ChileSantiago Chile
- Department of RadiologySchool of Medicine, Pontificia Universidad Católica de ChileSantiago Chile
| | - Julio Sotelo
- Biomedical Imaging CenterPontificia Universidad Católica de ChileSantiago Chile
- Department of Electrical EngineeringPontificia Universidad Católica de ChileSantiago Chile
| | - Marcelo E. Andia
- Biomedical Imaging CenterPontificia Universidad Católica de ChileSantiago Chile
- Department of RadiologySchool of Medicine, Pontificia Universidad Católica de ChileSantiago Chile
| | - Cristian Tejos
- Biomedical Imaging CenterPontificia Universidad Católica de ChileSantiago Chile
- Department of Electrical EngineeringPontificia Universidad Católica de ChileSantiago Chile
| | - Pablo Irarrazaval
- Biomedical Imaging CenterPontificia Universidad Católica de ChileSantiago Chile
- Department of Electrical EngineeringPontificia Universidad Católica de ChileSantiago Chile
| | - Daniel E. Hurtado
- Department of Structural and Geotechnical EngineeringPontificia Universidad Católica de ChileSantiago Chile
- Institute for Biological and Medical EngineeringSchools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Católica de ChileSantiago Chile
| | - Israel Valverde
- Hospital Virgen del RocioUniversidad de SevillaSeville Spain
- Institute of Biomedicine of SevilleUniversidad de SevillaSeville Spain
| | - Sergio Uribe
- Biomedical Imaging CenterPontificia Universidad Católica de ChileSantiago Chile
- Department of RadiologySchool of Medicine, Pontificia Universidad Católica de ChileSantiago Chile
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19
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Sotelo J, Urbina J, Valverde I, Mura J, Tejos C, Irarrazaval P, Andia ME, Hurtado DE, Uribe S. Three-dimensional quantification of vorticity and helicity from 3D cine PC-MRI using finite-element interpolations. Magn Reson Med 2017; 79:541-553. [DOI: 10.1002/mrm.26687] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 03/01/2017] [Accepted: 03/05/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Julio Sotelo
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Department of Electrical Engineering; Pontificia Universidad Católica de Chile; Santiago Chile
- Department of Structural and Geotechnical Engineering; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Jesús Urbina
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Department of Radiology; School of Medicine, Pontificia Universidad Católica de Chile; Santiago Chile
| | - Israel Valverde
- Pediatric Cardiology Unit; Hospital Virgen del Rocio; Sevilla Spain
- Cardiovascular Pathology Unit; Institute of Biomedicine of Seville (IBIS), Hospital Virgen del Rocio; Sevilla Spain
| | - Joaquín Mura
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Cristián Tejos
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Department of Electrical Engineering; Pontificia Universidad Católica de Chile; Santiago Chile
- Institute for Biological and Medical Engineering; Schools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Católica de Chile; Santaigo Chile
| | - Pablo Irarrazaval
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Department of Electrical Engineering; Pontificia Universidad Católica de Chile; Santiago Chile
- Institute for Biological and Medical Engineering; Schools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Católica de Chile; Santaigo Chile
| | - Marcelo E. Andia
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Department of Radiology; School of Medicine, Pontificia Universidad Católica de Chile; Santiago Chile
- Institute for Biological and Medical Engineering; Schools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Católica de Chile; Santaigo Chile
| | - Daniel E. Hurtado
- Department of Structural and Geotechnical Engineering; Pontificia Universidad Católica de Chile; Santiago Chile
- Institute for Biological and Medical Engineering; Schools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Católica de Chile; Santaigo Chile
| | - Sergio Uribe
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Department of Radiology; School of Medicine, Pontificia Universidad Católica de Chile; Santiago Chile
- Institute for Biological and Medical Engineering; Schools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Católica de Chile; Santaigo Chile
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Phinikaridou A, Andia ME, Lavin B, Smith A, Saha P, Botnar RM. Increased Vascular Permeability Measured With an Albumin-Binding Magnetic Resonance Contrast Agent Is a Surrogate Marker of Rupture-Prone Atherosclerotic Plaque. Circ Cardiovasc Imaging 2016; 9:e004910. [PMID: 27940955 PMCID: PMC5388187 DOI: 10.1161/circimaging.116.004910] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 09/30/2016] [Indexed: 12/21/2022]
Abstract
BACKGROUND Compromised structural integrity of the endothelium and higher microvessel density increase vascular permeability. We investigated whether vascular permeability measured in vivo by magnetic resonance imaging using the albumin-binding contrast agent, gadofosveset, is a surrogate marker of rupture-prone atherosclerotic plaque in a rabbit model. METHODS AND RESULTS New Zealand white rabbits (n=10) were rendered atherosclerotic by cholesterol-diet and endothelial denudation. Plaque rupture was triggered with Russell's viper venom and histamine. Animals were imaged pre-triggering, at 3 and 12 weeks, to quantify plaque area, vascular permeability, vasodilation, and stiffness and post-triggering to identify thrombus. Plaques identified on the pretrigger scans were classified as stable or rupture-prone based on the absence or presence of thrombus on the corresponding post-trigger magnetic resonance imaging, respectively. All rabbits had developed atherosclerosis, and 60% had ruptured plaques. Rupture-prone plaques had higher vessel wall relaxation rate (R1; 2.30±0.5 versus 1.86±0.3 s-1; P<0.001), measured 30 minutes after gadofosveset administration, and higher R1/plaque area ratio (0.70±0.06 versus 0.47±0.02, P= 0.01) compared with stable plaque at 12 weeks. Rupture-prone plaques had higher percent change in R1 between the 3 and 12 weeks compared with stable plaque (50.80±7.2% versus 14.22±2.2%; P<0.001). Immunohistochemistry revealed increased vessel wall albumin and microvessel density in diseased aortas and especially in ruptured plaque. Electron microscopy showed lack of structural integrity in both luminal and microvascular endothelium in diseased vessels. Functionally, the intrinsic vasodilation of the vessel wall decreased at 12 weeks compared with 3 weeks (18.60±1.0% versus 23.43±0.8%; P<0.001) and in rupture-prone compared with stable lesions (16.40±2.0% versus 21.63±1.2%; P<0.001). Arterial stiffness increased at 12 weeks compared with 3 weeks (5.00±0.1 versus 2.53±0.2 m/s; P<0.001) both in animals with stable and rupture-prone lesions. CONCLUSIONS T1 mapping using an albumin-binding contrast agent (gadofosveset) could quantify the changes in vascular permeability associated with atherosclerosis progression and rupture-prone plaques.
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Affiliation(s)
- Alkystis Phinikaridou
- From the Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., B.L., R.M.B.), Academic Department of Surgery, Cardiovascular Division (A.S., P.S.), BHF Centre of Excellence, Cardiovascular Division (A.S., R.M.B.), and Wellcome Trust and EPSRC Medical Engineering Center (P.S., R.M.B.), King's College London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile (M.E.A.).
| | - Marcelo E Andia
- From the Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., B.L., R.M.B.), Academic Department of Surgery, Cardiovascular Division (A.S., P.S.), BHF Centre of Excellence, Cardiovascular Division (A.S., R.M.B.), and Wellcome Trust and EPSRC Medical Engineering Center (P.S., R.M.B.), King's College London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile (M.E.A.)
| | - Begoña Lavin
- From the Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., B.L., R.M.B.), Academic Department of Surgery, Cardiovascular Division (A.S., P.S.), BHF Centre of Excellence, Cardiovascular Division (A.S., R.M.B.), and Wellcome Trust and EPSRC Medical Engineering Center (P.S., R.M.B.), King's College London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile (M.E.A.)
| | - Alberto Smith
- From the Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., B.L., R.M.B.), Academic Department of Surgery, Cardiovascular Division (A.S., P.S.), BHF Centre of Excellence, Cardiovascular Division (A.S., R.M.B.), and Wellcome Trust and EPSRC Medical Engineering Center (P.S., R.M.B.), King's College London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile (M.E.A.)
| | - Prakash Saha
- From the Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., B.L., R.M.B.), Academic Department of Surgery, Cardiovascular Division (A.S., P.S.), BHF Centre of Excellence, Cardiovascular Division (A.S., R.M.B.), and Wellcome Trust and EPSRC Medical Engineering Center (P.S., R.M.B.), King's College London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile (M.E.A.)
| | - René M Botnar
- From the Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., B.L., R.M.B.), Academic Department of Surgery, Cardiovascular Division (A.S., P.S.), BHF Centre of Excellence, Cardiovascular Division (A.S., R.M.B.), and Wellcome Trust and EPSRC Medical Engineering Center (P.S., R.M.B.), King's College London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile (M.E.A.)
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Mura J, Pino AM, Sotelo J, Valverde I, Tejos C, Andia ME, Irarrazaval P, Uribe S. Enhancing the Velocity Data From 4D Flow MR Images by Reducing its Divergence. IEEE Trans Med Imaging 2016; 35:2353-2364. [PMID: 27214892 DOI: 10.1109/tmi.2016.2570010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Velocity measurements from 4D flow MRI are prone to be affected by several imperfections of the MR system. Assuming that blood is incompressible, we propose a novel method for enhancing the velocity field by reducing its divergence. To enhance the velocity data, we added a corrector velocity to each voxel such that the divergence is minimized. The method was validated using an analytical Womersley flow model for different settings of resolution and noise levels. The performance of the proposed method was also assessed in volunteers and patients. Results demonstrated a significant reduction of the divergence depending on the size of the regularization term, obtaining a reduction close to 50% of the mean divergence with negligible modification of flow parameters. Remarkably, we found that the reduction of the divergence, in percentage, was independent of volunteers, resolution or noise.
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Sotelo J, Urbina J, Valverde I, Tejos C, Irarrazaval P, Andia ME, Uribe S, Hurtado DE. 3D Quantification of Wall Shear Stress and Oscillatory Shear Index Using a Finite-Element Method in 3D CINE PC-MRI Data of the Thoracic Aorta. IEEE Trans Med Imaging 2016; 35:1475-1487. [PMID: 26780787 DOI: 10.1109/tmi.2016.2517406] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Several 2D methods have been proposed to estimate WSS and OSI from PC-MRI, neglecting the longitudinal velocity gradients that typically arise in cardiovascular flow, particularly on vessel geometries whose cross section and centerline orientation strongly vary in the axial direction. Thus, the contribution of longitudinal velocity gradients remains understudied. In this work, we propose a 3D finite-element method for the quantification of WSS and OSI from 3D-CINE PC-MRI that accounts for both in-plane and longitudinal velocity gradients. We demonstrate the convergence and robustness of the method on cylindrical geometries using a synthetic phantom based on the Poiseuille flow equation. We also show that, in the presence of noise, the method is both stable and accurate. Using computational fluid dynamics simulations, we show that the proposed 3D method results in more accurate WSS estimates than those obtained from a 2D analysis not considering out-of-plane velocity gradients. Further, we conclude that for irregular geometries the accurate prediction of WSS requires the consideration of longitudinal gradients in the velocity field. Additionally, we compute 3D maps of WSS and OSI for 3D-CINE PC-MRI data sets from an aortic phantom and sixteen healthy volunteers and two patients. The OSI values show a greater dispersion than WSS, which is strongly dependent on the PC-MRI resolution. We envision that the proposed 3D method will improve the estimation of WSS and OSI from 3D-CINE PC-MRI images, allowing for more accurate estimates in vessels with pathologies that induce high longitudinal velocity gradients, such as coarctations and aneurisms.
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Urbina J, Sotelo JA, Springmüller D, Montalba C, Letelier K, Tejos C, Irarrázaval P, Andia ME, Razavi R, Valverde I, Uribe SA. Realistic aortic phantom to study hemodynamics using MRI and cardiac catheterization in normal and aortic coarctation conditions. J Magn Reson Imaging 2016; 44:683-97. [DOI: 10.1002/jmri.25208] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 02/09/2016] [Indexed: 11/06/2022] Open
Affiliation(s)
- Jesús Urbina
- School of Medicine; Pontificia Universidad Católica de Chile; Santiago Chile
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Julio A. Sotelo
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Electrical Engineering Department; Pontificia Universidad Católica de Chile; Santiago Chile
- Structural and Geotechnical Engineering Department; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Daniel Springmüller
- Pediatric Cardiology Unit, School of Medicine; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Cristian Montalba
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Karis Letelier
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Cristián Tejos
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Electrical Engineering Department; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Pablo Irarrázaval
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Electrical Engineering Department; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Marcelo E. Andia
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Radiology Department, School of Medicine; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Reza Razavi
- Division of Imaging Sciences; King's College London; London UK
| | - Israel Valverde
- Division of Imaging Sciences; King's College London; London UK
- Pediatric Cardiology Unit, Hospital Virgen del Rocio; Universidad de Sevilla; Seville Spain
- Institute of Biomedicine of Seville; Universidad de Sevilla; Seville Spain
| | - Sergio A. Uribe
- Biomedical Imaging Center; Pontificia Universidad Católica de Chile; Santiago Chile
- Radiology Department, School of Medicine; Pontificia Universidad Católica de Chile; Santiago Chile
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Phinikaridou A, Lacerda S, Andia ME, Botnar R. Development of a tropoelastin-binding MR contrast agent for in vivo imaging of impaired elastogenesis in atherosclerosis. J Cardiovasc Magn Reson 2015. [PMCID: PMC4328333 DOI: 10.1186/1532-429x-17-s1-o102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Phinikaridou A, Andia ME, Plaza BL, Saha P, Smith A, Botnar R. Increased vascular permeability is a surrogate marker of atherosclerotic plaque instability. J Cardiovasc Magn Reson 2015. [PMCID: PMC4328171 DOI: 10.1186/1532-429x-17-s1-q111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Phinikaridou A, Saha P, Andia ME, Smith A, Botnar R. Multi-sequence non-contrast MRI characterization of deep vein thrombosis in man. J Cardiovasc Magn Reson 2015. [PMCID: PMC4328685 DOI: 10.1186/1532-429x-17-s1-p10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Urbina J, Sotelo J, Tejos C, Irarrazaval P, Andia ME, Razavi R, Valverde I, Uribe S. A realistic MR compatible aortic phantom to validate hemodynamic parameters from MRI data: aortic coarctation patients comparison using catheterization. J Cardiovasc Magn Reson 2015. [PMCID: PMC4328964 DOI: 10.1186/1532-429x-17-s1-p199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Arboleda C, Aguirre-Reyes D, García MP, Tejos C, Muñoz L, Miquel JF, Irarrazaval P, Andia ME, Uribe S. Total liver fat quantification using three-dimensional respiratory self-navigated MRI sequence. Magn Reson Med 2015; 76:1400-1409. [PMID: 26588040 DOI: 10.1002/mrm.26028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 10/06/2015] [Accepted: 10/06/2015] [Indexed: 12/17/2022]
Abstract
PURPOSE MRI can produce quantitative liver fat fraction (FF) maps noninvasively, which can help to improve diagnoses of fatty liver diseases. However, most sequences acquire several two-dimensional (2D) slices during one or more breath-holds, which may be difficult for patients with limited breath-holding capacity. A whole-liver 3D FF map could also be obtained in a single acquisition by applying a reliable breathing-motion correction method. Several correction techniques are available for 3D imaging, but they use external devices, interrupt acquisition, or jeopardize the spatial resolution. To overcome these issues, a proof-of-concept study introducing a self-navigated 3D three-point Dixon sequence is presented here. METHODS A respiratory self-gating strategy acquiring a center k-space profile was integrated into a three-point Dixon sequence. We obtained 3D FF maps from a water-fat emulsions phantom and fifteen volunteers. This sequence was compared with multi-2D breath-hold and 3D free-breathing approaches. RESULTS Our 3D three-point Dixon self-navigated sequence could correct for respiratory-motion artifacts and provided more precise FF measurements than breath-hold multi-2D and 3D free-breathing techniques. CONCLUSION Our 3D respiratory self-gating fat quantification sequence could correct for respiratory motion artifacts and yield more-precise FF measurements. Magn Reson Med 76:1400-1409, 2016. © 2015 International Society for Magnetic Resonance in Medicine.
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Affiliation(s)
- Carolina Arboleda
- Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Chile.,Department of Electrical Engineering, Pontificia Universidad Católica de Chile, Chile
| | - Daniel Aguirre-Reyes
- Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Chile.,Department of Electrical Engineering, Pontificia Universidad Católica de Chile, Chile.,Department of Computational Sciences and Electronics, Universidad Técnica Particular de Loja, Ecuador
| | - María Paz García
- Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Chile
| | - Cristián Tejos
- Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Chile.,Department of Electrical Engineering, Pontificia Universidad Católica de Chile, Chile
| | - Loreto Muñoz
- Department of Chemistry and Bioprocesses, Pontificia Universidad Católica de Chile, Chile
| | - Juan Francisco Miquel
- Department of Gastroenterology, School of Medicine, Pontificia Universidad Cat ólica de Chile, Chile
| | - Pablo Irarrazaval
- Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Chile.,Department of Electrical Engineering, Pontificia Universidad Católica de Chile, Chile
| | - Marcelo E Andia
- Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Chile.,Department of Radiology, School of Medicine, Pontificia Universidad Católica de Chile, Chile
| | - Sergio Uribe
- Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Chile. .,Department of Radiology, School of Medicine, Pontificia Universidad Católica de Chile, Chile.
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Aguirre-Reyes DF, Sotelo JA, Arab JP, Arrese M, Tejos R, Irarrazaval P, Tejos C, Uribe SA, Andia ME. Intrahepatic portal vein blood volume estimated by non-contrast magnetic resonance imaging for the assessment of portal hypertension. Magn Reson Imaging 2015; 33:970-7. [PMID: 26117696 DOI: 10.1016/j.mri.2015.06.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 06/21/2015] [Indexed: 12/31/2022]
Abstract
PURPOSE To investigate the feasibility of estimating the portal vein blood volume that flows into the intrahepatic volume (IHPVBV) in each cardiac cycle using non-contrast MR venography technique as a surrogate marker of portal hypertension (PH). MATERIALS AND METHODS Ten patients with chronic liver disease and clinical symptoms of PH (40% males, median age: 54.0, range: 44-73 years old) and ten healthy volunteers (80% males, median age: 54.0, range: 44-66 years old) were included in this study. A non-contrast Triple-Inversion-Recovery Arterial-Spin-Labeling (TIR-ASL) technique was used to quantify the IHPVBV in one and two cardiac cycles. Liver (LV) and spleen volumes (SV) were measured by manual segmentation from anatomical MR images as morphological markers of PH. All images were acquired in a 1.5T Philips Achieva MR scanner. RESULTS PH patients had larger SV (P=0.02) and lower liver-to-spleen ratio (P=0.02) compared with healthy volunteers. The median IHPVBV in healthy volunteers was 13.5cm(3) and 26.5cm(3) for one and two cardiac cycles respectively, whereas in PH patients a median volume of 3.1cm(3) and 9.0cm(3) was observed. When correcting by LV, the IHPVBV was significantly higher in healthy volunteers than PH patients for one and two cardiac cycles. The combination of morphological information (liver-to-spleen ratio) and functional information (IHPVBV/LV) can accurately identify the PH patients with a sensitivity of 90% and specificity of 100%. CONCLUSION Results show that the portal vein blood volume that flows into the intrahepatic volume in one and two cardiac cycles is significantly lower in PH patients than in healthy volunteers and can be quantified with non-contrast MRI techniques.
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Affiliation(s)
- Daniel F Aguirre-Reyes
- Biomedical Imaging Center, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile; Electrical Engineering Department, School of Engineering, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile; Computation Sciences and Electronic Department, Universidad Tecnica Particular de Loja, Ecuador, Loja 1101608, Ecuador.
| | - Julio A Sotelo
- Biomedical Imaging Center, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile; Electrical Engineering Department, School of Engineering, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile.
| | - Juan P Arab
- Gastroenterology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, 8331150, Chile.
| | - Marco Arrese
- Gastroenterology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, 8331150, Chile.
| | - Rodrigo Tejos
- Gastroenterology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, 8331150, Chile.
| | - Pablo Irarrazaval
- Biomedical Imaging Center, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile; Electrical Engineering Department, School of Engineering, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile.
| | - Cristian Tejos
- Biomedical Imaging Center, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile; Electrical Engineering Department, School of Engineering, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile.
| | - Sergio A Uribe
- Biomedical Imaging Center, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile; Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, 8331150, Chile.
| | - Marcelo E Andia
- Biomedical Imaging Center, Pontificia Universidad Catolica de Chile, Santiago, 7820436, Chile; Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, 8331150, Chile.
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Passacquale G, Phinikaridou A, Warboys C, Cooper M, Lavin B, Alfieri A, Andia ME, Botnar RM, Ferro A. Aspirin-induced histone acetylation in endothelial cells enhances synthesis of the secreted isoform of netrin-1 thus inhibiting monocyte vascular infiltration. Br J Pharmacol 2015; 172:3548-64. [PMID: 25824964 PMCID: PMC4507159 DOI: 10.1111/bph.13144] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 02/19/2015] [Accepted: 03/23/2015] [Indexed: 12/18/2022] Open
Abstract
Background and Purpose There are conflicting data regarding whether netrin-1 retards or accelerates atherosclerosis progression, as it can lead either to monocyte repulsion from or retention within plaques depending on its cellular source. We investigated the effect of aspirin, which is widely used in cardiovascular prophylaxis, on the synthesis of different isoforms of netrin-1 by endothelial cells under pro-inflammatory conditions, and defined the net effect of aspirin-dependent systemic modulation of netrin-1 on atherosclerosis progression. Experimental Approach Netrin-1 synthesis was studied in vitro using human endothelial cells stimulated with TNF-α, with or without aspirin treatment. In vivo experiments were conducted in ApoE−/− mice fed with a high-fat diet (HFD), receiving either aspirin or clopidogrel. Key Results TNF-α-induced NF-κB activation up-regulated the nuclear isoform of netrin-1, while simultaneously reducing secreted netrin-1. Down-regulation of the secreted isoform compromised the chemorepellent action of the endothelium against monocyte chemotaxis. Aspirin counteracted TNF-α-mediated effects on netrin-1 synthesis by endothelial cells through COX-dependent inhibition of NF-κB and concomitant histone hyperacetylation. Administration of aspirin to ApoE−/− mice on HFD increased blood and arterial wall levels of netrin-1 independently of its effects on platelets, accompanied by reduced plaque size and content of monocytes/macrophages, compared with untreated or clopidogrel-treated mice. In vivo blockade of netrin-1 enhanced monocyte plaque infiltration in aspirin-treated ApoE−/− mice. Conclusions and Implications Aspirin counteracts down-regulation of secreted netrin-1 induced by pro-inflammatory stimuli in endothelial cells. The aspirin-dependent increase of netrin-1 in ApoE−/− mice exerts anti-atherogenic effects by preventing arterial accumulation of monocytes.
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Affiliation(s)
- Gabriella Passacquale
- Department of Clinical Pharmacology, BHF Centre of Research Excellence, Cardiovascular Division, King's College London, London, UK
| | - Alkystis Phinikaridou
- Division of Imaging Sciences and Biomedical Engineering, BHF Centre of Research Excellence and the Wellcome Trust/EPSRC Medical Engineering Centre, King's College London, London, UK
| | - Christina Warboys
- Department of Clinical Pharmacology, BHF Centre of Research Excellence, Cardiovascular Division, King's College London, London, UK
| | - Margaret Cooper
- Division of Imaging Sciences and Biomedical Engineering, BHF Centre of Research Excellence and the Wellcome Trust/EPSRC Medical Engineering Centre, King's College London, London, UK
| | - Begona Lavin
- Division of Imaging Sciences and Biomedical Engineering, BHF Centre of Research Excellence and the Wellcome Trust/EPSRC Medical Engineering Centre, King's College London, London, UK
| | - Alessio Alfieri
- Department of Vascular Biology, BHF Centre of Research Excellence, Cardiovascular Division, King's College London, London, UK
| | - Marcelo E Andia
- Division of Imaging Sciences and Biomedical Engineering, BHF Centre of Research Excellence and the Wellcome Trust/EPSRC Medical Engineering Centre, King's College London, London, UK
| | - Rene M Botnar
- Division of Imaging Sciences and Biomedical Engineering, BHF Centre of Research Excellence and the Wellcome Trust/EPSRC Medical Engineering Centre, King's College London, London, UK
| | - Albert Ferro
- Department of Clinical Pharmacology, BHF Centre of Research Excellence, Cardiovascular Division, King's College London, London, UK
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Bigalke B, Phinikaridou A, Andia ME, Cooper MS, Schuster A, Wurster T, Onthank D, Münch G, Blower P, Gawaz M, Nagel E, Botnar RM. PET/CT and MR imaging biomarker of lipid-rich plaques using [64Cu]-labeled scavenger receptor (CD68-Fc). Int J Cardiol 2014; 177:287-91. [PMID: 25499394 DOI: 10.1016/j.ijcard.2014.09.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 08/25/2014] [Accepted: 09/15/2014] [Indexed: 02/06/2023]
Abstract
Continued uptake of modified low-density lipoproteins (LDL) by the scavenger receptor, CD68, of activated macrophages is a crucial process in the development of atherosclerotic plaques and leads to the formation of foam cells. Eight-weeks-old male Apolipoprotein E-deficient (ApoE(-/-)) mice (n = 6) were fed a high-fat diet for 12 weeks. C57BL/6J wildtype (WT) mice served as controls (n = 6). Positron emission tomography (PET) with an acquisition time of 1800 s (NanoPET/CT scanner; Mediso, Hungary & Bioscan, USA) was carried out 24h after intravenous tail vein administration of 50 µl (64)Cu-CD68-Fc (~20-30 µg labeled protein/mouse containing approximately 10-12 MBq (64)Cu-CD68-Fc per mouse). Three days after PET/CT, all mice received an intravenous administration of 0.2 mmol/kg body weight of a gadolinium-based elastin-binding contrast agent to assess plaque burden and vessel wall remodeling. Two hours after injection, mice were imaged in a 3T clinical MR scanner (Philips Healthcare, Best, NL) using a dedicated single loop surface coil (23 mm). Enhanced (64)Cu-CD68-Fc uptake was found in the aortic arches of ApoE(-/-) compared to WT mice (ApoE(-/-) mice:10.5 ± 1.5 Bq/cm(3) vs. WT mice: 2.1 ± 0.3 Bq/cm(3); P = 0.002). Higher gadolinium-based elastin-binding contrast agent uptake was also detected in the aortic arch of ApoE(-/-) compared to WT mice using R(1) maps (R(1) = 1.47 ± 0.06 s(-1) vs. 0.92 ± 0.05 s(-1); P <0.001). Radiolabeled scavenger receptor ((64)Cu-CD68-Fc) may help to target foam cell rich plaques with high content of oxidized LDL. This novel imaging biomarker tool may have potential to identify unstable plaques and for risk stratification.
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MESH Headings
- Animals
- Antigens, CD/metabolism
- Antigens, Differentiation, Myelomonocytic/metabolism
- Carotid Artery, Common/diagnostic imaging
- Carotid Artery, Common/pathology
- Copper Radioisotopes
- Disease Models, Animal
- Magnetic Resonance Imaging/methods
- Male
- Mice
- Mice, Inbred C57BL
- Plaque, Atherosclerotic/diagnosis
- Plaque, Atherosclerotic/metabolism
- Positron-Emission Tomography/methods
- Receptors, Scavenger/metabolism
- Reproducibility of Results
- Tomography, X-Ray Computed/methods
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Affiliation(s)
- Boris Bigalke
- King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom; Charité Campus Benjamin Franklin, Universitätsmedizin Berlin, Medizinische Klinik für Kardiologie und Pulmologie, Berlin, Germany
| | - Alkystis Phinikaridou
- King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom
| | - Marcelo E Andia
- King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom; Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Chile
| | - Margaret S Cooper
- King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom
| | - Andreas Schuster
- King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom; Department of Cardiology and Pulmonology, Georg-August-University, Göttingen, Germany; Department of Cardiology and Pulmonology, German Centre for Cardiovascular Research (DZHK Partner Site), Göttingen, Germany
| | - Thomas Wurster
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany
| | | | | | - Philip Blower
- King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom
| | - Meinrad Gawaz
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen, Eberhard-Karls-Universität Tübingen, Germany
| | - Eike Nagel
- King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom; BHF Centre of Excellence, King's College London, United Kingdom; Wellcome Trust and EPSRC Medical Engineering Center, King's College London, United Kingdom; NIHR Biomedical Research Centre, King's College London, London, United Kingdom
| | - Rene M Botnar
- King's College London, Division of Imaging Sciences and Biomedical Engineering, London, United Kingdom; AdvanceCor GmbH, Martinsried, Germany; Wellcome Trust and EPSRC Medical Engineering Center, King's College London, United Kingdom; NIHR Biomedical Research Centre, King's College London, London, United Kingdom.
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Hussain T, Henningsson M, Butzbach B, Lossnitzer D, Greil GF, Andia ME, Botnar RM. Combined coronary lumen and vessel wall magnetic resonance imaging with i-T2prep: influence of nitroglycerin. Int J Cardiovasc Imaging 2014; 31:77-82. [PMID: 25200588 DOI: 10.1007/s10554-014-0525-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Accepted: 08/23/2014] [Indexed: 10/24/2022]
Abstract
It has been shown that sublingual nitroglycerin (NTG) improves image quality of coronary lumen magnetic resonance angiography. Our aim was to investigate the influence of NTG on coronary lumen and vessel wall image quality using a combined, single sequence approach (i-T2prep), which is able to image both within the known time frame of action of NTG. Ten healthy volunteers underwent right coronary artery lumen and vessel wall imaging using the i-T2prep sequence before and after administration of NTG. Image quality was assessed qualitatively and quantitatively. Diameter, length and wall thickness were also measured using dedicated semi-automatic software. NTG induced coronary vasodilatation (lumen diameter increased from 2.16 ± 0.32 to 2.52 ± 0.59 mm; p = 0.036). As a result, visualized lumen length (9.8 ± 2.6 to 11.4 ± 3.3 cm; p = 0.025) and qualitative lumen image quality (median 3 (interquartile range 2-3.25) vs. median 3 (interquartile range 3-4); p = 0.046) both improved. Vessel wall imaging also demonstrated a significant improvement in vessel wall sharpness after NTG (24.8 vs. 27.3 %; p = 0.036). This study demonstrates the benefits of NTG for coronary lumen and vessel wall imaging using a combined sequence, i-T2prep. The methodology described here has great potential for future pathophysiological studies.
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Affiliation(s)
- Tarique Hussain
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St Thomas' Hospital, 4th Floor Lambeth Wing, Westminster Bridge Road, London, SE17EH, UK,
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Phinikaridou A, Andia ME, Indermuehle A, Onthank DC, Cesati RR, Smith A, Robinson SP, Saha P, Botnar RM. Vascular Remodeling and Plaque Vulnerability in a Rabbit Model of Atherosclerosis: Comparison of Delayed-Enhancement MR Imaging with an Elastin-specific Contrast Agent and Unenhanced Black-Blood MR Imaging. Radiology 2014; 271:390-9. [DOI: 10.1148/radiol.13130502] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Andia ME, Saha P, Jenkins J, Modarai B, Wiethoff AJ, Phinikaridou A, Grover SP, Patel AS, Schaeffter T, Smith A, Botnar RM. Fibrin-targeted magnetic resonance imaging allows in vivo quantification of thrombus fibrin content and identifies thrombi amenable for thrombolysis. Arterioscler Thromb Vasc Biol 2014; 34:1193-1198. [PMID: 24723557 DOI: 10.1161/atvbaha.113.302931] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Deep venous thrombosis is a major health problem. Thrombolytic therapies are effective in recanalizing the veins and preventing post-thrombotic complications, but there is no consensus on selection criteria. The aim of this study was to investigate a fibrin-specific MRI contrast agent (EP-2104R) for the accurate quantification of thrombus' fibrin content in vivo and for the identification of thrombus suitable for thrombolysis. APPROACH AND RESULTS Venous thrombosis was induced in the inferior vena cava of 8- to 10-week-old male BALB/C mice and MRI performed 2, 4, 7, 10, 14, and 21 days later. Eighteen mice were scanned at each time point pre and 2 hours post injection of EP-2104R (8.0 μmol/kg) with 12 mice at each time point used to correlate fibrin contrast uptake with thrombus' histological stage and fibrin content. Six mice at each time point were immediately subjected to intravascular thrombolytic therapy (10 mg/kg of tissue-type plasminogen activator). Mice were imaged to assess response to lytic therapy 24 hours after thrombolytic treatment. Two mice at each time point were scanned post injection of 0.2 mmol/kg of Gd-DTPA (gadolinium with diethylenetriaminepentacetate, Magnevist, Schering AG, Berlin, Germany) for control purpose. Contrast uptake was correlated positively with the fibrin content of the thrombus measured by Western blotting (R(2)=0.889; P<0.001). Thrombus relaxation rate (R1) post contrast and the change in visualized thrombus size on late gadolinium enhancement inversion recovery MRI pre-EP-2104R and post-EP-2104R injection were the best predictors for successful thrombolysis (area under the curve, 0.989 [95% confidence interval, 0.97-1.00] and 0.994 [95% confidence interval, 0.98-1.00] respectively). CONCLUSIONS MRI with a fibrin-specific contrast agent accurately estimates thrombus fibrin content in vivo and identifies thrombi that are amenable for thrombolysis.
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Affiliation(s)
- Marcelo E Andia
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Prakash Saha
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Julia Jenkins
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Bijan Modarai
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Andrea J Wiethoff
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Alkystis Phinikaridou
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Steven P Grover
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Ashish S Patel
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Tobias Schaeffter
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Alberto Smith
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Rene M Botnar
- Division of Imaging Sciences and Biomedical Engineering, School of Medicine, St Thomas' Hospital, King's College London, London, Received on: May 3, 2013; final version accepted on: April 1, 2014. United Kingdom (M.E.A., A.J.W., A.P., T.S., R.M.B.); Academic Department of Surgery, Cardiovascular Division (P.S., J.J., B.M., S.P.G., A.S.P., A.S.), Wellcome Trust and EPSRC Medical Engineering Centre (T.S., R.M.B.), BHF Centre of Excellence, Cardiovascular Division (T.S., A.S., R.M.B.), and NIHR Biomedical Research Centre, GSTT (T.S., A.S., R.M.B.), School of Medicine, King's College London, London, United Kingdom; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
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Letelier K, Andia ME, Tejos C, Irarrazaval P, Prieto C, Uribe S. Accelerating the acquisition of the 3D Dual Cardiac Phase technique using RPE trajectories. J Cardiovasc Magn Reson 2014. [PMCID: PMC4044069 DOI: 10.1186/1532-429x-16-s1-w38] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Miras AD, Seyfried F, Phinikaridou A, Andia ME, Christakis I, Spector AC, Botnar RM, le Roux CW. Rats fed diets with different energy contribution from fat do not differ in adiposity. Obes Facts 2014; 7:302-10. [PMID: 25277969 PMCID: PMC5644822 DOI: 10.1159/000368622] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 08/01/2014] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVE To determine whether rats reaching the same body mass, having been fed either a low-fat (LFD) or a high-fat diet (HFD), differ in white adipose tissue (WAT) deposition. METHODS In experiment 1, 22 Sprague-Dawley rats of the same age were divided into 11 rats with body mass below the batch median and fed a HFD, and 11 above the median and fed a LFD. In experiment 2, 20 Sprague-Dawley rats of the same age and starting body mass were randomised to either a HFD or LFD. When all groups reached similar final body mass, WAT was quantified using magnetic resonance imaging (MRI), dissection, and plasma leptin. RESULTS In experiment 1, both groups reached similar final body mass at the same age; in experiment 2 the HFD group reached similar final body mass earlier than the LFD group. There were no significant differences in WAT as assessed by MRI or leptin between the HFD and LFD groups in both experiments. Dissection revealed a trend for higher retroperitoneal and epididymal adiposity in the HFD groups in both experiments. CONCLUSIONS We conclude that at similar body mass, adiposity is independent of the macronutrient composition of the feeding regimen used to achieve it.
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Affiliation(s)
- Alexander D. Miras
- Section of Investigative Medicine, Imperial College London, UK
- *Dr Alexander Miras, Section of Investigative Medicine, Imperial College London, Hammersmith Hospital, London, W12 0NN (UK),
| | - Florian Seyfried
- Department of General and Visceral, Vascular and Pediatric Surgery, University of Wurzburg, Wurzburg, Germany
| | - Alkystis Phinikaridou
- Division of Imaging Sciences and Biomedical Engineering, The Rayne Institute, 4th Floor, Lambeth Wing, St. Thomas’ Hospital, King's College London, London, UK
| | - Marcelo E. Andia
- Division of Imaging Sciences and Biomedical Engineering, The Rayne Institute, 4th Floor, Lambeth Wing, St. Thomas’ Hospital, King's College London, London, UK
- Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile
| | | | - Alan C. Spector
- Department of Psychology and Program in Neuroscience, Florida State University, Tallahassee, FL, USA
| | - René M. Botnar
- Division of Imaging Sciences and Biomedical Engineering, The Rayne Institute, 4th Floor, Lambeth Wing, St. Thomas’ Hospital, King's College London, London, UK
- British Heart Foundation Centre of Excellence, Cardiovascular Division, King's College London, London, UK
- Wellcome Trust and EPSRC Medical Engineering Center, King's College London, UK
| | - Carel W. le Roux
- Section of Investigative Medicine, Imperial College London, UK
- Diabetes Complications Research Centre, UCD Conway Institute, School of Medicine and Medical Science, University College Dublin, Dublin, Ireland
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Phinikaridou A, Andia ME, Lacerda S, Lorrio S, Makowski MR, Botnar RM. Molecular MRI of atherosclerosis. Molecules 2013; 18:14042-69. [PMID: 24232739 PMCID: PMC6270261 DOI: 10.3390/molecules181114042] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 10/29/2013] [Accepted: 10/29/2013] [Indexed: 11/22/2022] Open
Abstract
Despite advances in prevention, risk assessment and treatment, coronary artery disease (CAD) remains the leading cause of morbidity and mortality in Western countries. The lion's share is due to acute coronary syndromes (ACS), which are predominantly triggered by plaque rupture or erosion and subsequent coronary thrombosis. As the majority of vulnerable plaques does not cause a significant stenosis, due to expansive remodeling, and are rather defined by their composition and biological activity, detection of vulnerable plaques with x-ray angiography has shown little success. Non-invasive vulnerable plaque detection by identifying biological features that have been associated with plaque progression, destabilization and rupture may therefore be more appropriate and may allow earlier detection, more aggressive treatment and monitoring of treatment response. MR molecular imaging with target specific molecular probes has shown great promise for the noninvasive in vivo visualization of biological processes at the molecular and cellular level in animals and humans. Compared to other imaging modalities; MRI can provide excellent spatial resolution; high soft tissue contrast and has the ability to simultaneously image anatomy; function as well as biological tissue composition and activity.
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Affiliation(s)
- Alkystis Phinikaridou
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St Thomas’ Hospital, London SE1 7EH, UK; E-Mails: (A.P.); (M.E.A.); (S.L.); (S.L.); (M.R.M.)
| | - Marcelo E. Andia
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St Thomas’ Hospital, London SE1 7EH, UK; E-Mails: (A.P.); (M.E.A.); (S.L.); (S.L.); (M.R.M.)
- Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago 8331150, Chile
| | - Sara Lacerda
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St Thomas’ Hospital, London SE1 7EH, UK; E-Mails: (A.P.); (M.E.A.); (S.L.); (S.L.); (M.R.M.)
| | - Silvia Lorrio
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St Thomas’ Hospital, London SE1 7EH, UK; E-Mails: (A.P.); (M.E.A.); (S.L.); (S.L.); (M.R.M.)
| | - Marcus R. Makowski
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St Thomas’ Hospital, London SE1 7EH, UK; E-Mails: (A.P.); (M.E.A.); (S.L.); (S.L.); (M.R.M.)
- Department of Radiology, Charite, Berlin 10117, Germany
| | - René M. Botnar
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, 4th Floor, Lambeth Wing, St Thomas’ Hospital, London SE1 7EH, UK; E-Mails: (A.P.); (M.E.A.); (S.L.); (S.L.); (M.R.M.)
- Wellcome Trust and ESPRC Medical Engineering Center, King’s College London, London SE1 7EH, UK
- BHF Centre of Excellence, King’s College London, London SE1 7EH, UK
- NIHR Biomedical Research Centre, King’s College London, London SE1 7EH, UK
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Bigalke B, Phinikaridou A, Andia ME, Cooper MS, Schuster A, Schönberger T, Griessinger CM, Wurster T, Onthank D, Ungerer M, Gawaz M, Nagel E, Botnar RM. Positron emission tomography/computed tomographic and magnetic resonance imaging in a murine model of progressive atherosclerosis using (64)Cu-labeled glycoprotein VI-Fc. Circ Cardiovasc Imaging 2013; 6:957-64. [PMID: 24107491 DOI: 10.1161/circimaging.113.000488] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Plaque erosion leads to exposure of subendothelial collagen, which may be targeted by glycoprotein VI (GPVI). We aimed to detect plaque erosion using (64)Cu-labeled GPVI-Fc (fragment crystallized). METHODS AND RESULTS Four-week-old male apolipoprotein E-deficient (ApoE(-/-)) mice (n=6) were fed a high-fat diet for 12 weeks. C57BL/6J wild-type (WT) mice served as controls (n=6). Another group of WT mice received a ligation injury of the left carotid artery (n=6) or sham procedure (n=4). All mice received a total activity of ≈12 MBq (64)Cu-GPVI-Fc by tail vein injection followed by delayed (24 hours) positron emission tomography using a NanoPET/computed tomographic scanner (Mediso, Hungary; Bioscan, USA) with an acquisition time of 1800 seconds. Seventy-two hours after positron emission tomography/computed tomography, all mice were scanned 2 hours after intravenous administration of 0.2 mmol/kg body weight of a gadolinium-based elastin-specific MR contrast agent. MRI was performed on a 3-T clinical scanner (Philips Healthcare, Best, The Netherlands). In ApoE(-/-) mice, the (64)Cu-GPVI-Fc uptake in the aortic arch was significantly higher compared with WT mice (ApoE(-/-): 13.2±1.5 Bq/cm(3) versus WT mice: 5.1±0.5 Bq/cm(3); P=0.028). (64)Cu-GPVI-Fc uptake was also higher in the injured left carotid artery wall compared with the intact right carotid artery of WT mice and as a trend compared with sham procedure (injured: 20.7±1.3 Bq/cm(3) versus intact: 2.3±0.5 Bq/cm(3); P=0.028 versus sham: 12.7±1.7 Bq/cm(3); P=0.068). Results were confirmed by ex vivo histology and in vivo MRI with elastin-specific MR contrast agent that measures plaque burden and vessel wall remodeling. Higher R1 relaxation rates were found in the injured carotid wall with a T1 mapping sequence (injured: 1.44±0.08 s(-1) versus intact: 0.91±0.02 s(-1); P=0.028 versus sham: 0.97±0.05 s(-1); P=0.068) and in the aortic arch of ApoE(-/-) mice compared with WT mice (ApoE(-/-): 1.49±0.05 s(-1) versus WT: 0.92±0.04 s(-1); P=0.028). CONCLUSIONS (64)Cu-GPVI-Fc positron emission tomographic imaging allows identification of exposed subendothelial collagen in injured WT and high-fat diet-fed ApoE(-/-) mice.
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Affiliation(s)
- Boris Bigalke
- Medizinische Klinik III, Kardiologie und Kreislauferkrankungen
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Phinikaridou A, Andia ME, Passacquale G, Ferro A, Botnar RM. Noninvasive MRI monitoring of the effect of interventions on endothelial permeability in murine atherosclerosis using an albumin-binding contrast agent. J Am Heart Assoc 2013; 2:e000402. [PMID: 24072533 PMCID: PMC3835253 DOI: 10.1161/jaha.113.000402] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Background Endothelial dysfunction promotes atherosclerosis. We investigated whether in vivo magnetic resonance imaging (MRI) using an albumin‐binding contrast agent, gadofosveset, could monitor the efficacy of minocycline and ebselen in reducing endothelial permeability and atherosclerotic burden in the brachiocephalic artery of high‐fat diet (HFD)–fed ApoE−/− mice. Methods and Results ApoE−/− mice were scanned 12 weeks after commencement of either a normal diet (controls) or an HFD. HFD‐fed ApoE−/− mice were either untreated or treated with minocycline or ebselen for 12 weeks. Delayed‐enhancement MRI and T1 mapping of the brachiocephalic artery, 30 minutes after injection of gadofosveset, showed increased vessel wall enhancement and relaxation rate (R1, s−1) in untreated HFD‐fed ApoE−/− mice (R1=3.8±0.52 s−1) compared with controls (R1=2.15±0.34 s−1, P<0.001). Conversely, minocycline‐treated (R1=2.7±0.17 s−1, P<0.001) and ebselen‐treated (R1=2.7±0.23 s−1, P<0.001) ApoE−/− mice showed less vessel wall enhancement compared with untreated HFD‐fed ApoE−/− mice. Mass spectroscopy showed a lower gadolinium concentration in the brachiocephalic artery of treated (minocycline=28.5±3 μmol/L, ebselen=32.4±4 μmol/L) compared with untreated HFD‐fed ApoE−/− mice (191±4.8 μmol/L) (P<0.02). Both interventions resulted in a lower plaque burden as measured by delayed‐enhancement MRI (minocycline=0.14±0.02 mm2, ebselen=0.20±0.09 mm2, untreated=0.44±0.01 mm2; P<0.001) and histology (minocycline=0.13±0.05 mm2, ebselen=0.18±0.02 mm2, untreated=0.32±0.04 mm2; P<0.002). Endothelium cells displayed fewer structural changes and smaller gap junction width in treated compared with untreated animals as seen by electron microscopy (minocycline=42.3±8.4 nm, ebselen=56.5±17 nm, untreated=2400±39 nm; P<0.001). Tissue flow cytometry of the brachiocephalic artery showed lower monocyte/macrophage content in both ebselen‐ and minocycline‐treated mice (8.06±3.2% and 7.62±1.73%, respectively) compared with untreated animals (20.1±2.2%) (P=0.03), with significant attenuation of the proinflammatory Ly6Chigh subtype (untreated mice, 42.64±6.1% of total monocytes; ebselen, 14.07±9.5% of total monocytes; minocycline, 26.42±0.6% of total monocytes). Conclusions We demonstrate that contrast‐enhanced MRI with an albumin‐binding contrast agent can be used to noninvasively monitor the effect of interventions on endothelial permeability and plaque burden. Blood albumin leakage could be a surrogate marker for the in vivo evaluation of interventions that aim at restoring endothelial integrity.
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Affiliation(s)
- Alkystis Phinikaridou
- Division of Imaging Science and Biomedical Engineering, King's College London, London, United Kingdom
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Protti A, Dong X, Andia ME, Yu B, Dokukina K, Chaubey S, Phinikaridou A, Vizcay-Barrena G, Taupitz M, Botnar RM, Shah AM. Assessment of inflammation with a very small iron-oxide particle in a murine model of reperfused myocardial infarction. J Magn Reson Imaging 2013; 39:598-608. [PMID: 24006053 DOI: 10.1002/jmri.24191] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 04/03/2013] [Indexed: 12/22/2022] Open
Abstract
PURPOSE To investigate a very small iron-oxide particle (VSOP) in a mouse model of acute ischemia-reperfusion to access the mechanism of such particles in areas of myocardial inflammation. MATERIALS AND METHODS Animals were injected with VSOP at several time points, in a mouse model of acute myocardial infarction (MI), before and after MI. MRI was used to localize areas of VSOP enhancement, evaluate VSOP areas extension, and determine the related T2* values. Histology, electron microscopy, macrophage counting, and Evan's Blue staining were also performed. RESULTS We found that areas of VSOP uptake decreased from 1 to 8 days post-MI while the related T2* values increased. T2* and VSOP areas, defined from MRI data, correlated well between 1 and 3 days post-MI but not at 7 days after injection. Histological analysis and electron microscopy showed colocalization of macrophages with areas of VSOP staining. However, there was no correlation between number of macrophages and the extension of the VSOP areas achieved by MR. We found that only areas of increased permeability (assessed by Evan's Blue staining) showed colocalization of macrophages and VSOP uptake. CONCLUSION This study demonstrates that VSOP allows the assessment of myocardial inflammation associated with increased permeability during infarct healing in a mouse model of ischemia-reperfusion.
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Affiliation(s)
- Andrea Protti
- King's College London British Heart Foundation Centre of Excellence, Cardiovascular Division, King's College London, London, United Kingdom; King's College London British Heart Foundation Centre of Excellence, Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom
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Saha P, Andia ME, Modarai B, Blume U, Humphries J, Patel AS, Phinikaridou A, Evans CE, Mattock K, Grover SP, Ahmad A, Lyons OT, Attia RQ, Renné T, Premaratne S, Wiethoff AJ, Botnar RM, Schaeffter T, Waltham M, Smith A. Magnetic resonance T1 relaxation time of venous thrombus is determined by iron processing and predicts susceptibility to lysis. Circulation 2013; 128:729-736. [PMID: 23820077 DOI: 10.1161/circulationaha.113.001371] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND The magnetic resonance longitudinal relaxation time (T1) changes with thrombus age in humans. In this study, we investigate the possible mechanisms that give rise to the T1 signal in venous thrombi and whether changes in T1 relaxation time are informative of the susceptibility to lysis. METHODS AND RESULTS Venous thrombosis was induced in the vena cava of BALB/C mice, and temporal changes in T1 relaxation time correlated with thrombus composition. The mean T1 relaxation time of thrombus was shortest at 7 days following thrombus induction and returned to that of blood as the thrombus resolved. T1 relaxation time was related to thrombus methemoglobin formation and further processing. Studies in inducible nitric oxide synthase (iNOS(-/-))-deficient mice revealed that inducible nitric oxide synthase mediates oxidation of erythrocyte lysis-derived iron to paramagnetic Fe3+, which causes thrombus T1 relaxation time shortening. Studies using chemokine receptor-2-deficient mice (Ccr2(-/-)) revealed that the return of the T1 signal to that of blood is regulated by removal of Fe3+ by macrophages that accumulate in the thrombus during its resolution. Quantification of T1 relaxation time was a good predictor of successful thrombolysis with a cutoff point of <747 ms having a sensitivity and specificity to predict successful lysis of 83% and 94%, respectively. CONCLUSIONS The source of the T1 signal in the thrombus results from the oxidation of iron (released from the lysis of trapped erythrocytes in the thrombus) to its paramagnetic Fe3+ form. Quantification of T1 relaxation time appears to be a good predictor of the success of thrombolysis.
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Affiliation(s)
- Prakash Saha
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Marcelo E Andia
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Bijan Modarai
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Ulrike Blume
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Julia Humphries
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Ashish S Patel
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Alkystis Phinikaridou
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Colin E Evans
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Katherine Mattock
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Steven P Grover
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Anwar Ahmad
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Oliver T Lyons
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Rizwan Q Attia
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Thomas Renné
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Sobath Premaratne
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Andrea J Wiethoff
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - René M Botnar
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Tobias Schaeffter
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Matthew Waltham
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
| | - Alberto Smith
- Academic Department of Surgery, Cardiovascular Division, Kings College London, BHF Centre of Research Excellence & NIHR Biomedical Research Centre at Kings Health Partners, St Thomas' Hospital, London, UK (P.S., B.M., J.H., A.S.P., C.E.E., K.M., S.P.G., A.A., O.T.L., R.Q.A., S.P., M.W., A.S.); Division of Imaging Sciences and Biomedical Engineering, Kings College London, BHF Centre of Research Excellence & Wellcome Trust - EPSRC Medical Engineering Centre & NIHR Biomedical Research Centre at Kings Health Partners, St. Thomas' Hospital, London, UK (M.E.A., U.B., A.P., A.J.W., T.S.); Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.); Department of Molecular Medicine and Surgery, Karolinska Institutet and University Hospital Solna, Stockholm, Sweden (T.R.); and Philips Healthcare, Guildford, UK (A.J.W.)
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Milovic C, Oses C, Villalón M, Uribe S, Lizama C, Prieto C, Andia ME, Irarrazaval P, Tejos C. Calcium (Ca2+) waves data calibration and analysis using image processing techniques. BMC Bioinformatics 2013; 14:162. [PMID: 23679062 PMCID: PMC3667061 DOI: 10.1186/1471-2105-14-162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 05/07/2013] [Indexed: 11/16/2022] Open
Abstract
Background Calcium (Ca2+) propagates within tissues serving as an important information carrier. In particular, cilia beat frequency in oviduct cells is partially regulated by Ca2+ changes. Thus, measuring the calcium density and characterizing the traveling wave plays a key role in understanding biological phenomena. However, current methods to measure propagation velocities and other wave characteristics involve several manual or time-consuming procedures. This limits the amount of information that can be extracted, and the statistical quality of the analysis. Results Our work provides a framework based on image processing procedures that enables a fast, automatic and robust characterization of data from two-filter fluorescence Ca2+ experiments. We calculate the mean velocity of the wave-front, and use theoretical models to extract meaningful parameters like wave amplitude, decay rate and time of excitation. Conclusions Measurements done by different operators showed a high degree of reproducibility. This framework is also extended to a single filter fluorescence experiments, allowing higher sampling rates, and thus an increased accuracy in velocity measurements.
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Affiliation(s)
- Carlos Milovic
- Department of Electrical Engineering, Pontificia Universidad Catolica de Chile, Santiago, Chile.
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Phinikaridou A, Andia ME, Saha P, Modarai B, Smith A, Botnar RM. In vivo magnetization transfer and diffusion-weighted magnetic resonance imaging detects thrombus composition in a mouse model of deep vein thrombosis. Circ Cardiovasc Imaging 2013; 6:433-440. [PMID: 23564561 DOI: 10.1161/circimaging.112.000077] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND Deep vein thrombosis remains a major health problem necessitating accurate diagnosis. Thrombolysis is associated with significant morbidity and is effective only for the treatment of unorganized thrombus. We tested the feasibility of in vivo magnetization transfer (MT) and diffusion-weighted magnetic resonance imaging to detect thrombus organization in a murine model of deep vein thrombosis. METHODS AND RESULTS Deep vein thrombosis was induced in the inferior vena cava of male BALB/C mice. Magnetic resonance imaging was performed at days 1, 7, 14, 21, and 28 after thrombus induction using MT, diffusion-weighted, inversion-recovery, and T1-mapping protocols. Delayed enhancement and T1 mapping were repeated 2 hours after injection of a fibrin contrast agent. Finally, excised thrombi were used for histology. We found that MT and diffusion-weighted imaging can detect histological changes associated with thrombus aging. MT rate (MTR) maps and percentage of MT rate (%MTR) allowed visualization and quantification of the thrombus protein content, respectively. The %MTR increased with thrombus organization and was significantly higher at days 14, 21, and 28 after thrombus induction (days 1, 7, 14, 21, 28: %MTR=2483±451, 2079±1210, 7029±2490, 10 295±4356, 32 994±25 449; PANOVA<0.05). There was a significant positive correlation between the %MTR and the histological protein content of the thrombus (r=0.70; P<0.05). The apparent diffusion coefficient was lower in erythrocyte-rich and collagen-rich thrombus (0.72±0.10 and 0.69±0.05 [×10(-3) mm(2)/s]). Thrombus at days 7 and 14 had the highest apparent diffusion coefficient values (0.95±0.09 and 1.10±0.18 [×10(-3) mm(2)/s]). CONCLUSIONS MT and diffusion-weighted magnetic resonance imaging sequences are promising for the staging of thrombus composition and could be useful in guiding medical intervention.
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Affiliation(s)
- Alkystis Phinikaridou
- Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., R.M.B.), Cardiovascular Division, Academic Department of Surgery (P.S., B.M., A.S.), Cardiovascular Division, BHF Centre of Excellence (A.P., P.S., A.S., R.M.B.), Wellcome Trust and EPSRC Medical Engineering Center (R.M.B.), King's College London, London, UK; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Marcelo E Andia
- Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., R.M.B.), Cardiovascular Division, Academic Department of Surgery (P.S., B.M., A.S.), Cardiovascular Division, BHF Centre of Excellence (A.P., P.S., A.S., R.M.B.), Wellcome Trust and EPSRC Medical Engineering Center (R.M.B.), King's College London, London, UK; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Prakash Saha
- Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., R.M.B.), Cardiovascular Division, Academic Department of Surgery (P.S., B.M., A.S.), Cardiovascular Division, BHF Centre of Excellence (A.P., P.S., A.S., R.M.B.), Wellcome Trust and EPSRC Medical Engineering Center (R.M.B.), King's College London, London, UK; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Bijan Modarai
- Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., R.M.B.), Cardiovascular Division, Academic Department of Surgery (P.S., B.M., A.S.), Cardiovascular Division, BHF Centre of Excellence (A.P., P.S., A.S., R.M.B.), Wellcome Trust and EPSRC Medical Engineering Center (R.M.B.), King's College London, London, UK; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - Alberto Smith
- Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., R.M.B.), Cardiovascular Division, Academic Department of Surgery (P.S., B.M., A.S.), Cardiovascular Division, BHF Centre of Excellence (A.P., P.S., A.S., R.M.B.), Wellcome Trust and EPSRC Medical Engineering Center (R.M.B.), King's College London, London, UK; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
| | - René M Botnar
- Division of Imaging Science and Biomedical Engineering (A.P., M.E.A., R.M.B.), Cardiovascular Division, Academic Department of Surgery (P.S., B.M., A.S.), Cardiovascular Division, BHF Centre of Excellence (A.P., P.S., A.S., R.M.B.), Wellcome Trust and EPSRC Medical Engineering Center (R.M.B.), King's College London, London, UK; and Radiology Department, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile (M.E.A.)
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Phinikaridou A, Andia ME, Shah AM, Botnar RM. Advances in molecular imaging of atherosclerosis and myocardial infarction: shedding new light on in vivo cardiovascular biology. Am J Physiol Heart Circ Physiol 2012; 303:H1397-410. [PMID: 23064836 DOI: 10.1152/ajpheart.00583.2012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Molecular imaging of the cardiovascular system heavily relies on the development of new imaging probes and technologies to facilitate visualization of biological processes underlying or preceding disease. Molecular imaging is a highly active research discipline that has seen tremendous growth over the past decade. It has broadened our understanding of oncologic, neurologic, and cardiovascular diseases by providing new insights into the in vivo biology of disease progression and therapeutic interventions. As it allows for the longitudinal evaluation of biological processes, it is ideally suited for monitoring treatment response. In this review, we will concentrate on the major accomplishments and advances in the field of molecular imaging of atherosclerosis and myocardial infarction with a special focus on magnetic resonance imaging.
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Affiliation(s)
- Alkystis Phinikaridou
- Division of Imaging Science and Biomedical Engineering, King's College London, United Kingdom.
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Phinikaridou A, Andia ME, Protti A, Indermuehle A, Shah A, Smith A, Warley A, Botnar RM. Noninvasive magnetic resonance imaging evaluation of endothelial permeability in murine atherosclerosis using an albumin-binding contrast agent. Circulation 2012; 126:707-19. [PMID: 22753191 DOI: 10.1161/circulationaha.112.092098] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Endothelial dysfunction promotes atherosclerosis and precedes acute cardiovascular events. We investigated whether in vivo magnetic resonance imaging with the use of an albumin-binding contrast agent, gadofosveset, could detect endothelial damage associated with atherosclerosis in apolipoprotein E-deficient (ApoE(-/-)) mice. Furthermore, we tested whether magnetic resonance imaging could noninvasively assess endothelial function by measuring the endothelial-dependent vasodilation in response to acetylcholine. METHODS AND RESULTS ApoE(-/-) mice were imaged at 4, 8, and 12 weeks after commencement of a high-fat diet. Statin-treated ApoE(-/-) mice were scanned after 12 weeks of a high-fat diet. Wild-type mice were imaged before and 48 hours after injection of Russell's viper venom, an endothelial toxin. Delayed enhancement magnetic resonance imaging and T1 mapping of the brachiocephalic artery, 30 minutes after injection of gadofosveset, showed increased vessel wall enhancement and relaxation rate (R(1)) with progression of atherosclerosis in ApoE(-/-)(R(1) [s(-1)]: R(4 weeks) 2.42±0.35, R(8 weeks) 3.45±0.54, R(12 weeks) 3.83±0.52) and Russell's viper venom-injected wild-type mice (R(1)=4.57±0.86). Conversely, wild-type (R(1)=2.15±0.34) and statin-treated ApoE(-/-) (R(1)=3.0±0.65) mice showed less enhancement. Uptake of gadofosveset correlated with Evans blue staining, morphological changes of endothelial cells, and widening of the cell-cell junctions, suggesting that uptake occurs in regions of increased vascular permeability. Endothelial-dependent vasomotor responses showed vasoconstriction of the arteries of the ApoE(-/-) (-22.22±7.95%) and Russell's viper venom-injected (-10.37±17.60%) mice compared with wild-type mice (32.45±12.35%). Statin treatment improved endothelium morphology and function (-8.12±8.22%). CONCLUSIONS We demonstrate the noninvasive assessment of endothelial permeability and function with the use of an albumin-binding magnetic resonance contrast agent. Blood albumin leakage could be a surrogate marker for the in vivo evaluation of interventions that aim to restore the endothelium.
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Affiliation(s)
- Alkystis Phinikaridou
- King's College London, Division of Imaging Sciences and Biomedical Engineering, The Rayne Institute, 4th Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, United Kingdom.
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Prieto C, Andia ME, von Bary C, Onthank DC, Schaeffter T, Botnar RM. Accelerating three‐dimensional molecular cardiovascular MR imaging using compressed sensing. J Magn Reson Imaging 2012; 36:1362-71. [DOI: 10.1002/jmri.23763] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Accepted: 06/21/2012] [Indexed: 11/06/2022] Open
Affiliation(s)
- Claudia Prieto
- King's College London, Division of Imaging Sciences, and Biomedical Engineering, London, United Kingdom
- Pontificia Universidad Catolica de Chile, Escuela de Ingenieria, Santiago, Chile
| | - Marcelo E. Andia
- King's College London, Division of Imaging Sciences, and Biomedical Engineering, London, United Kingdom
| | | | | | - Tobias Schaeffter
- King's College London, Division of Imaging Sciences, and Biomedical Engineering, London, United Kingdom
| | - Rene M. Botnar
- King's College London, Division of Imaging Sciences, and Biomedical Engineering, London, United Kingdom
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Andia ME, Henningsson M, Hussain T, Phinikaridou A, Protti A, Greil G, Botnar RM. Flow-independent 3D whole-heart vessel wall imaging using an interleaved T2-preparation acquisition. Magn Reson Med 2012; 69:150-7. [DOI: 10.1002/mrm.24231] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 01/23/2012] [Accepted: 02/05/2012] [Indexed: 11/10/2022]
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Andia ME, Botnar RM. Arterial spin labeling angiography using a triple inversion recovery prepulse. Magn Reson Med 2011; 67:477-83. [DOI: 10.1002/mrm.23028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 05/05/2011] [Indexed: 11/10/2022]
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Bertran E, Heise K, Andia ME, Ferreccio C. Gallbladder cancer: Incidence and survival in a high-risk area of Chile. Int J Cancer 2010; 127:2446-54. [DOI: 10.1002/ijc.25421] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Andia ME, Botnar RM. Spin-spoiler: a novel arterial spin labeling technique without the need of subtraction. J Cardiovasc Magn Reson 2010. [DOI: 10.1186/1532-429x-12-s1-o58] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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