1
|
Arias-Argáez BC, Dzul-Huchim VM, Haro-Álvarez AP, Rosado-Vallado ME, Villanueva-Lizama L, Cruz-Chan JV, Dumonteil E. Signature of cardiac alterations in early and late chronic infections with Trypanosoma cruzi in mice. PLoS One 2023; 18:e0292520. [PMID: 37797045 PMCID: PMC10553825 DOI: 10.1371/journal.pone.0292520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 09/23/2023] [Indexed: 10/07/2023] Open
Abstract
Chagas disease by Trypanosoma cruzi (T. cruzi) infection is a leading cause of myocarditis worldwide. Chagas cardiomyopathy is presented with a wide variety of conduction abnormalities including arrhythmias, first- and second-degree atrioventricular blockade, left ventricular systolic dysfunction and some cases heart failure leading to the death. Currently, there are no effective treatments available against advanced Chagas disease. With the advance in the development of novel therapies, it is important to utilize an animal model that can effectively replicate the diverse stages of Chagas disease, including chronic asymptomatic and symptomatic infection, that are akin to those observed in humans. Therefore, to characterize the cardiac alterations during the evolution of the infection, we evaluated the progression of cardiomyopathy caused by T. cruzi H1 infection in both BALB/c and ICR mouse models by performing electrocardiogram (ECG) studies in unanesthetized mice every month until 210 days post-infection (dpi). In the late chronic phase of infection, we also performed echocardiogram (ECHO) studies to further assess cardiac function. In conclusion, we demonstrated that ICR mice were more susceptible to cardiac alterations compared to BALB/c mice and both mouse strains are suitable experimental models to study chronic T. cruzi infection and novel treatments.
Collapse
Affiliation(s)
- Bárbara Carolina Arias-Argáez
- Laboratorio de Parasitología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Victor Manuel Dzul-Huchim
- Laboratorio de Parasitología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Ana Paulina Haro-Álvarez
- Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexicali, Baja California, México
| | - Miguel Enrique Rosado-Vallado
- Laboratorio de Parasitología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Liliana Villanueva-Lizama
- Laboratorio de Parasitología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Julio Vladimir Cruz-Chan
- Laboratorio de Parasitología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Eric Dumonteil
- Department of Tropical Medicine and Infectious Disease, School of Public Health and Tropical Medicine, and Vector-Borne and Infectious Disease Research Center, Tulane University, New Orleans, Louisiana, United States of America
| |
Collapse
|
2
|
Jo YY, Jang JH, Kwon JM, Lee HC, Jung CW, Byun S, Jeong H. Predicting intraoperative hypotension using deep learning with waveforms of arterial blood pressure, electroencephalogram, and electrocardiogram: Retrospective study. PLoS One 2022; 17:e0272055. [PMID: 35944013 PMCID: PMC9362925 DOI: 10.1371/journal.pone.0272055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Accepted: 07/13/2022] [Indexed: 11/18/2022] Open
Abstract
To develop deep learning models for predicting Interoperative hypotension (IOH) using waveforms from arterial blood pressure (ABP), electrocardiogram (ECG), and electroencephalogram (EEG), and to determine whether combination ABP with EEG or CG improves model performance. Data were retrieved from VitalDB, a public data repository of vital signs taken during surgeries in 10 operating rooms at Seoul National University Hospital from January 6, 2005, to March 1, 2014. Retrospective data from 14,140 adult patients undergoing non-cardiac surgery with general anaesthesia were used. The predictive performances of models trained with different combinations of waveforms were evaluated and compared at time points at 3, 5, 10, 15 minutes before the event. The performance was calculated by area under the receiver operating characteristic (AUROC), area under the precision-recall curve (AUPRC), sensitivity and specificity. The model performance was better in the model using both ABP and EEG waveforms than in all other models at all time points (3, 5, 10, and 15 minutes before an event) Using high-fidelity ABP and EEG waveforms, the model predicted IOH with a AUROC and AUPRC of 0.935 [0.932 to 0.938] and 0.882 [0.876 to 0.887] at 5 minutes before an IOH event. The output of both ABP and EEG was more calibrated than that using other combinations or ABP alone. The results demonstrate that a predictive deep neural network can be trained using ABP, ECG, and EEG waveforms, and the combination of ABP and EEG improves model performance and calibration.
Collapse
Affiliation(s)
- Yong-Yeon Jo
- AI Research Team, Medical AI, Co. Ltd., Seoul, Republic of Korea
| | - Jong-Hwan Jang
- AI Research Team, Medical AI, Co. Ltd., Seoul, Republic of Korea
- Department of Biomedical Systems Informatics, Yonsei University College of Medicine, Yongin, Gyeonggi-do, Republic of Korea
| | - Joon-myoung Kwon
- AI Research Team, Medical AI, Co. Ltd., Seoul, Republic of Korea
- Department of Emergency Medicine, Mediplex Sejong Hospital, Incheon, Republic of Korea
| | - Hyung-Chul Lee
- Department of Anesthesiology and Pain Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Chul-Woo Jung
- Department of Anesthesiology and Pain Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Seonjeong Byun
- Department of Psychiatry, Uijeongbu St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Uijeongbu, Gyeonggi-do, Republic of Korea
- * E-mail: (SB); (HGJ)
| | - Han‐Gil Jeong
- Division of Neurocritical Care, Department of Neurosurgery and Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Republic of Korea
- Center for Artificial Intelligence in Healthcare, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
- * E-mail: (SB); (HGJ)
| |
Collapse
|
3
|
Multiparametric MRI identifies subtle adaptations for demarcation of disease transition in murine aortic valve stenosis. Basic Res Cardiol 2022; 117:29. [PMID: 35643805 PMCID: PMC9148878 DOI: 10.1007/s00395-022-00936-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/11/2022] [Accepted: 05/12/2022] [Indexed: 02/01/2023]
Abstract
Aortic valve stenosis (AS) is the most frequent valve disease with relevant prognostic impact. Experimental model systems for AS are scarce and comprehensive imaging techniques to simultaneously quantify function and morphology in disease progression are lacking. Therefore, we refined an acute murine AS model to closely mimic human disease characteristics and developed a high-resolution magnetic resonance imaging (MRI) approach for simultaneous in-depth analysis of valvular, myocardial as well as aortic morphology/pathophysiology to identify early changes in tissue texture and critical transition points in the adaptive process to AS. AS was induced by wire injury of the aortic valve. Four weeks after surgery, cine loops, velocity, and relaxometry maps were acquired at 9.4 T to monitor structural/functional alterations in valve, aorta, and left ventricle (LV). In vivo MRI data were subsequently validated by histology and compared to echocardiography. AS mice exhibited impaired valve opening accompanied by significant valve thickening due to fibrotic remodelling. While control mice showed bell-shaped flow profiles, AS resulted not only in higher peak flow velocities, but also in fragmented turbulent flow patterns associated with enhanced circumferential strain and an increase in wall thickness of the aortic root. AS mice presented with a mild hypertrophy but unaffected global LV function. Cardiac MR relaxometry revealed reduced values for both T1 and T2 in AS reflecting subtle myocardial tissue remodelling with early alterations in mitochondrial function in response to the enhanced afterload. Concomitantly, incipient impairments of coronary flow reserve and myocardial tissue integrity get apparent accompanied by early troponin release. With this, we identified a premature transition point with still compensated cardiac function but beginning textural changes. This will allow interventional studies to explore early disease pathophysiology and novel therapeutic targets.
Collapse
|
4
|
Mouat MA, Coleman JLJ, Wu J, Dos Remedios CG, Feneley MP, Graham RM, Smith NJ. Involvement of GPR37L1 in murine blood pressure regulation and human cardiac disease pathophysiology. Am J Physiol Heart Circ Physiol 2021; 321:H807-H817. [PMID: 34533400 DOI: 10.1152/ajpheart.00198.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 09/14/2021] [Indexed: 01/23/2023]
Abstract
Multiple mouse lines lacking the orphan G protein-coupled receptor, GPR37L1, have elicited disparate cardiovascular phenotypes. The first Gpr37l1 knockout mice study to be published reported a marked elevation in systolic blood pressure (SBP; ∼60 mmHg), revealing a potential therapeutic opportunity. The phenotype differed from our own independently generated knockout line, where male mice exhibited equivalent baseline blood pressure to wild type. Here, we attempted to reproduce the first study by characterizing the cardiovascular phenotype of both the original knockout and transgenic lines alongside a C57BL/6J control line, using the same method of blood pressure measurement. The present study supports the findings from our independently developed Gpr37l1 knockout line, finding that SBP and diastolic blood pressure (DBP) are not different in the original Gpr37l1 knockout male mice (SBP: 130.9 ± 5.3 mmHg; DBP: 90.7 ± 3.0 mmHg) compared with C57BL/6J mice (SBP: 123.1 ± 4.1 mmHg; DBP: 87.0 ± 2.7 mmHg). Instead, we attribute the apparent hypertension of the knockout line originally described to comparison with a seemingly hypotensive transgenic line (SBP 103.7 ± 5.0 mmHg; DBP 71.9 ± 3.7 mmHg). Additionally, we quantified myocardial GPR37L1 transcript in humans, which was suggested to be downregulated in cardiovascular disease. We found that GPR37L1 has very low native transcript levels in human myocardium and that expression is not different in tissue samples from patients with heart failure compared with sex-matched healthy control tissue. These findings indicate that cardiac GPR37L1 expression is unlikely to contribute to the pathophysiology of human heart failure.NEW & NOTEWORTHY This study characterizes systolic blood pressure (SBP) in a Gpr37l1 knockout mouse line, which was previously reported to have ∼60 mmHg higher SBP compared with a transgenic line. We observed only a ∼27 mmHg SBP difference between the lines. However, when compared with C57BL/6J mice, knockout mice showed no difference in SBP. We also investigated GPR37L1 mRNA abundance in human hearts and observed no difference between healthy and failing heart samples.
Collapse
Affiliation(s)
- Margaret A Mouat
- Molecular Pharmacology Laboratory, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
- St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
| | - James L J Coleman
- Molecular Pharmacology Laboratory, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
- St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
| | - Jianxin Wu
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
- Cardiac Physiology and Transplantation Division, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
| | - Cristobal G Dos Remedios
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
| | - Michael P Feneley
- Cardiac Physiology and Transplantation Division, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
| | - Robert M Graham
- St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
| | - Nicola J Smith
- Molecular Pharmacology Laboratory, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
- St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
- Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, New South Wales, Australia
| |
Collapse
|
5
|
Tyrankiewicz U, Olkowicz M, Berkowicz P, Jablonska M, Smolenski RT, Zoladz JA, Chlopicki S. Physical Activity and Inhibition of ACE Additively Modulate ACE/ACE-2 Balance in Heart Failure in Mice. Front Pharmacol 2021; 12:682432. [PMID: 34163362 PMCID: PMC8215444 DOI: 10.3389/fphar.2021.682432] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 05/04/2021] [Indexed: 01/14/2023] Open
Abstract
Angiotensin-converting enzyme inhibition (ACE-I) and physical activity favorably modulate the ACE/ACE-2 balance. However, it is not clear whether physical activity and ACE-I could synergistically modulate ACE/ACE-2 balance in the course of heart failure (HF). Here, we studied the effects of combined spontaneous physical activity and ACE-I–based treatment on angiotensin (Ang) pattern and cardiac function in a mouse model of HF (Tgαq*44). Tgαq*44 mice with advanced HF (at the age of 12 months) were running spontaneously in a running wheel (exercise training group, ExT) and/or were treated with ACE inhibitor (ACE-I, perindopril, 10 mg/kg) for 2 months. Angiotensin profile was characterized by an LC-MS/MS-based method. The cardiac performance was assessed in vivo by MRI. Ang-(1–7)/Ang II ratio in both plasma and the aorta was significantly higher in the combined treatment group than the ACE-I group or ExT alone, suggesting the additive favorable effects on ACE-2/Ang-(1–7) and ACE/Ang II axes’ balance induced by a combination of ACE-I with ExT. The basal cardiac performance did not differ among the experimental groups of Tgαq*44 mice. We demonstrated additive changes in ACE/ACE-2 balance in both plasma and the aorta by spontaneous physical activity and ACE-I treatment in Tgαq*44 mice. However, these changes did not result in an improvement of failing heart function most likely because the disease was at the end-stage. Ang-(1–7)/Ang II balance represents a valuable biochemical end point for monitoring therapeutic intervention outcome in heart failure.
Collapse
Affiliation(s)
- Urszula Tyrankiewicz
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Krakow, Poland
| | - Mariola Olkowicz
- Department of Biochemistry, Medical University of Gdansk, Gdansk, Poland
| | - Piotr Berkowicz
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Krakow, Poland.,Chair of Pharmacology, Jagiellonian University Medical College, Krakow, Poland
| | - Magdalena Jablonska
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | | | - Jerzy A Zoladz
- Department of Muscle Physiology, Faculty of Rehabilitation, University School of Physical Education, Krakow, Poland
| | - Stefan Chlopicki
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Krakow, Poland.,Chair of Pharmacology, Jagiellonian University Medical College, Krakow, Poland
| |
Collapse
|
6
|
Muyskens S, Roshan T, Honan K, Umejiego J, Raynaud S, Ogunyankin F. Effect of General Anesthesia on Cardiac Magnetic Resonance-Derived Cardiac Function in Repaired Tetralogy of Fallot. Pediatr Cardiol 2020; 41:1660-1666. [PMID: 32740671 DOI: 10.1007/s00246-020-02425-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 07/21/2020] [Indexed: 10/23/2022]
Abstract
Cardiac magnetic resonance imaging (CMR)-derived ejection fraction (EF) predicts adverse outcomes in repaired tetralogy of Fallot (rTOF) and drives timing of pulmonary valve replacement. Certain patient populations require sedation for successful CMR image acquisition. General anesthesia (GA) has been shown to depress EF and heart rate (HR) in animal models, however, its effect on congenital heart disease is unknown. A retrospective review was conducted of all CMR patients referred with rTOF between January 2011 and May 2019. The cohort was separated into GA and non-GA groups. Propensity score matching (PSM) adjusted for selection bias. A kernel matching algorithm was used to match subjects and the differences in mean treatment effect on the treated were computed for left ventricular (LV) and right ventricular (RV) EF, HR, and cardiac index (CI). 143 patients met criteria, 37 patients under GA (mean age 15 years, range 2-45, 59% male), and 106 patients without GA (mean age 21 years, range 10-53, 50% male). Unmatched analysis showed significant depression of LV EF (50 vs. 57%, p < 0.001) and RV EF (42 vs. 48%, p < 0.001) in the GA group compared to the non-GA group. There was no significant difference in HR or CI. After matching and PSM adjustment, the GA group had a significant decrease in LV EF (49 vs. 56%, p < 0.001), RV EF (41 vs. 48%, p < 0.001), CI (2728 vs. 3701 ml/min/m2, p < 0.001), and HR (72 vs. 79 bpm, p = 0.04). General anesthesia with sevoflurane results in depressed CMR-derived EF.
Collapse
Affiliation(s)
- Steve Muyskens
- Department of Pediatric Cardiology, Cook Children's Medical Center, 1500 Cooper Street, 3rd Floor, Fort Worth, TX, 76104, USA.
| | - Tony Roshan
- University of North Texas Health Science Center, Texas College of Osteopathic Medicine, Fort Worth, TX, USA
| | - Kevin Honan
- University of North Texas Health Science Center, Texas College of Osteopathic Medicine, Fort Worth, TX, USA
| | - Johnbosco Umejiego
- Department of Research Operations, Cook Children's Medical Center, Fort Worth, TX, USA
| | - Scott Raynaud
- Department of Research Operations, Cook Children's Medical Center, Fort Worth, TX, USA
| | - Fadeke Ogunyankin
- Department of Research Operations, Cook Children's Medical Center, Fort Worth, TX, USA
| |
Collapse
|
7
|
Rutledge C, Cater G, McMahon B, Guo L, Nouraie SM, Wu Y, Villanueva F, Kaufman BA. Commercial 4-dimensional echocardiography for murine heart volumetric evaluation after myocardial infarction. Cardiovasc Ultrasound 2020; 18:9. [PMID: 32164714 PMCID: PMC7068892 DOI: 10.1186/s12947-020-00191-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 02/26/2020] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Traditional preclinical echocardiography (ECHO) modalities, including 1-dimensional motion-mode (M-Mode) and 2-dimensional long axis (2D-US), rely on geometric and temporal assumptions about the heart for volumetric measurements. Surgical animal models, such as the mouse coronary artery ligation (CAL) model of myocardial infarction, result in morphologic changes that do not fit these geometric assumptions. New ECHO technology, including 4-dimensional ultrasound (4D-US), improves on these traditional models. This paper aims to compare commercially available 4D-US to M-mode and 2D-US in a mouse model of CAL. METHODS 37 mice underwent CAL surgery, of which 32 survived to a 4 week post-operative time point. ECHO was completed at baseline, 1 week, and 4 weeks after CAL. M-mode, 2D-US, and 4D-US were taken at each time point and evaluated by two separate echocardiographers. At 4 weeks, a subset (n = 12) of mice underwent cardiac magnetic resonance (CMR) imaging to serve as a reference standard. End systolic volume (ESV), end diastolic volume (EDV), and ejection fraction (EF) were compared among imaging modalities. Hearts were also collected for histologic evaluation of scar size (n = 16) and compared to ECHO-derived wall motion severity index (WMSI) and global longitudinal strain as well as gadolinium-enhanced CMR to compare scar assessment modalities. RESULTS 4D-US provides close agreement of ESV (Bias: -2.55%, LOA: - 61.55 to 66.66) and EF (US Bias: 11.23%, LOA - 43.10 to 102.8) 4 weeks after CAL when compared to CMR, outperforming 2D-US and M-mode estimations. 4D-US has lower inter-user variability as measured by intraclass correlation (ICC) in the evaluation of EDV (0.91) and ESV (0.93) when compared to other modalities. 4D-US also allows for rapid assessment of WMSI, which correlates strongly with infarct size by histology (r = 0.77). CONCLUSION 4D-US outperforms M-Mode and 2D-US for volumetric analysis 4 weeks after CAL and has higher inter-user reliability. 4D-US allows for rapid calculation of WMSI, which correlates well with histologic scar size.
Collapse
Affiliation(s)
- Cody Rutledge
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - George Cater
- Division of Cardiology, Cardiovascular Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Brenda McMahon
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Lanping Guo
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Seyed Mehdi Nouraie
- Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Yijen Wu
- Department of Developmental Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Flordeliza Villanueva
- Division of Cardiology, Cardiovascular Institute, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Brett A Kaufman
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA.
| |
Collapse
|
8
|
Kinchesh P, Gilchrist S, Beech JS, Gomes AL, Kersemans V, Newman RG, Vojnovic B, Allen PD, Brady M, Muschel RJ, Smart SC. Prospective gating control for highly efficient cardio-respiratory synchronised short and constant TR MRI in the mouse. Magn Reson Imaging 2018; 53:20-27. [PMID: 29964184 PMCID: PMC6154312 DOI: 10.1016/j.mri.2018.06.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 06/13/2018] [Accepted: 06/27/2018] [Indexed: 11/22/2022]
Abstract
PURPOSE Cardiac and respiratory motion derived image artefacts are reduced when data are acquired with cardiac and respiratory synchronisation. Where steady state imaging techniques are required in small animals, synchronisation is most commonly performed using retrospective gating techniques but these invoke an inherent time penalty. This paper reports the development of prospective gating techniques for cardiac and respiratory motion desensitised MRI with significantly reduced minimum scan time compared to retrospective gating. METHODS Prospective gating incorporating the automatic reacquisition of data corrupted by motion at the entry to each breath was implemented in short TR 3D spoiled gradient echo imaging. Motion sensitivity was examined over the whole mouse body for scans performed without gating, with respiratory gating, and with cardio-respiratory gating. The gating methods were performed with and without automatic reacquisition of motion corrupted data immediately after completion of the same breath. Prospective cardio-respiratory gating, with acquisition of 64 k-space lines per cardiac R-wave, was used to enable whole body DCE-MRI in the mouse. RESULTS Prospective cardio-respiratory gating enabled high fidelity steady state imaging of physiologically mobile organs such as the heart and lung. The automatic reacquisition of data corrupted by motion at the entry to each breath minimised respiratory motion artefact and enabled a highly efficient data capture that was adaptive to changes in the inter-breath interval. Prospective cardio-respiratory gating control enabled DCE-MRI to be performed over the whole mouse body with the acquisition of successive image volumes every 12-15 s at 422 μm isotropic resolution. CONCLUSIONS Highly efficient cardio-respiratory motion desensitised steady state MRI can be performed in small animals with prospective synchronisation, centre-out phase-encode ordering, and the automatic reacquisition of data corrupted by motion at the entry to each breath. The method presented is robust against spontaneous changes in the breathing rate. Steady state imaging with prospective cardio-respiratory gating is much more efficient than with retrospective gating, and enables the examination of rapidly changing systems such as those found when using DCE-MRI.
Collapse
Affiliation(s)
- Paul Kinchesh
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom.
| | - Stuart Gilchrist
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - John S Beech
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - Ana L Gomes
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - Veerle Kersemans
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - Robert G Newman
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - Borivoj Vojnovic
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - Philip D Allen
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - Michael Brady
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - Ruth J Muschel
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| | - Sean C Smart
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, United Kingdom
| |
Collapse
|
9
|
Wang L, Chen Y, Zhang B, Chen W, Wang C, Song L, Xu Z, Zheng J, Gao F. Self-Gated Late Gadolinium Enhancement at 7T to Image Rats with Reperfused Acute Myocardial Infarction. Korean J Radiol 2018. [PMID: 29520182 PMCID: PMC5840053 DOI: 10.3348/kjr.2018.19.2.247] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Objective A failed electrocardiography (ECG)-trigger often leads to a long acquisition time (TA) and deterioration in image quality. The purpose of this study was to evaluate and optimize the technique of self-gated (SG) cardiovascular magnetic resonance (CMR) for cardiac late gadolinium enhancement (LGE) imaging of rats with myocardial infarction/reperfusion. Materials and Methods Cardiovascular magnetic resonance images of 10 rats were obtained using SG-LGE or ECG with respiration double-gating (ECG-RESP-gating) method at 7T to compare differences in image interference and TA between the two methods. A variety of flip angles (FA: 10°-80°) and the number of repetitions (NR: 40, 80, 150, and 300) were investigated to determine optimal scan parameters of SG-LGE technique based on image quality score and contrast-to-noise ratio (CNR). Results Self-gated late gadolinium enhancement allowed successful scan in 10 (100%) rats. However, only 4 (40%) rats were successfully scanned with the ECG-RESP-gating method. TAs with SG-LGE varied depending on NR used (TA: 41, 82, 154, and 307 seconds, corresponding to NR of 40, 80, 150, and 300, respectively). For the ECG-RESP-gating method, the average TA was 220 seconds. For SG-LGE images, CNR (42.5 ± 5.5, 43.5 ± 7.5, 54 ± 9, 59.5 ± 8.5, 56 ± 13, 54 ± 8, and 41 ± 9) and image quality score (1.85 ± 0.75, 2.20 ± 0.83, 2.85 ± 0.37, 3.85 ± 0.52, 2.8 ± 0.51, 2.45 ± 0.76, and 1.95 ± 0.60) were achieved with different FAs (10°, 15°, 20°, 25°, 30°, 35°, and 40°, respectively). Optimal FAs of 20°-30° and NR of 80 were recommended. Conclusion Self-gated technique can improve image quality of LGE without irregular ECG or respiration gating. Therefore, SG-LGE can be used an alternative method of ECG-RESP-gating.
Collapse
Affiliation(s)
- Lei Wang
- Molecular Imaging Center, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Yushu Chen
- Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Bing Zhang
- Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Wei Chen
- Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Chunhua Wang
- Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Li Song
- Molecular Imaging Center, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Ziqian Xu
- Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Jie Zheng
- Mallinckrodt Institute of Radiology, Washington University School of Medicine in St. Louis, MO 63110, USA
| | - Fabao Gao
- Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China
| |
Collapse
|
10
|
Crowe LA, Montecucco F, Carbone F, Friedli I, Hachulla AL, Braunersreuther V, Mach F, Vallée JP. 4D cardiac imaging at clinical 3.0T provides accurate assessment of murine myocardial function and viability. Magn Reson Imaging 2017; 44:46-54. [PMID: 28827099 DOI: 10.1016/j.mri.2017.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 07/22/2017] [Accepted: 07/23/2017] [Indexed: 12/01/2022]
Abstract
OBJECTIVES We validate a 4D strategy tailored for 3T clinical systems to simultaneously quantify function and infarct size in wild type mice after ischemia/reperfusion, with improved spatial and temporal resolution by comparison to previous published protocols using clinical field MRI systems. METHODS C57BL/6J mice underwent 60min ischemia/reperfusion (n=14) or were controls without surgery (n=6). Twenty-four hours after surgery mice were imaged with gadolinium injection and sacrificed for post-mortem MRI and histology with serum also taken for Troponin I levels. The double ECG- and respiratory-triggered 3D FLASH (Fast Low Angle Shot) gradient echo (GRE) cine sequence had an acquired isotropic resolution of 344μm, TR/TE of 7.8/2.9ms and acquisition time 25-35min. The conventional 2D FLASH cine sequence had the same in-plane resolution of 344μm, 1mm slice thickness and TR/TE 11/5.4ms for an acquisition time of 20-25min plus 5min for planning. Left ventricle (LV) and right ventricle (RV) volumes were measured and functional parameters compared 2D to 3D, left to right and for inter and intra observer reproducibility. MRI infarct volume was compared to histology. RESULTS For the function evaluation, the 3D cine outperformed 2D cine for spatial and temporal resolution. Protocol time for the two methods was equivalent (25-35min). Flow artifacts were reduced (p=0.008) and epi/endo-cardial delineation showed good intra and interobserver reproducibility. Paired t-test comparing ejection volume left to right showed no significant difference for 3D (p=0.37), nor 2D (p=0.30) and correlation slopes of left to right EV were 1.17 (R2=0.75) for 2D and 1.05 (R2=0.50) for 3D. Quantifiable 'late gadolinium enhancement' infarct volume was seen only with the 3D cine and correlated to histology (R2=0.89). Left ejection fraction and MRI-measured infarct volume correlated (R2>0.3). CONCLUSIONS The 4D strategy, with contrast injection, was validated in mice for function and infarct quantification from a single scan with minimal slice planning.
Collapse
Affiliation(s)
- Lindsey A Crowe
- Division of Radiology, Department of Radiology and Medical Informatics, Geneva University Hospital and Faculty of Medicine, University of Geneva, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| | - Fabrizio Montecucco
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy; IRCCS AOU San Martino - IST, Genova, 10 Largo Rosanna Benzi, 16132 Genoa, Italy.
| | - Federico Carbone
- First Clinic of Internal Medicine, Department of Internal Medicine, University of Genoa, 6 viale Benedetto XV, 16132 Genoa, Italy.
| | - Iris Friedli
- Division of Radiology, Department of Radiology and Medical Informatics, Geneva University Hospital and Faculty of Medicine, University of Geneva, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| | - Anne-Lise Hachulla
- Division of Radiology, Department of Radiology and Medical Informatics, Geneva University Hospital and Faculty of Medicine, University of Geneva, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| | - Vincent Braunersreuther
- Division of Pathology, Department of Genetics and Laboratory Medicine, Geneva University Hospitals, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| | - François Mach
- Division of Cardiology, Foundation for Medical Researches, Faculty of Medicine, Department of Internal Medicine, University of Geneva, 64 avenue de la Roseraie, 1211 Geneva, Switzerland.
| | - Jean-Paul Vallée
- Division of Radiology, Department of Radiology and Medical Informatics, Geneva University Hospital and Faculty of Medicine, University of Geneva, 4 rue Gabrielle-Perret-Gentil, 1205 Geneva, Switzerland.
| |
Collapse
|
11
|
Tanaka DM, Romano MMD, Carvalho EEV, Oliveira LFL, Souza HCD, Maciel BC, Salgado HC, Fazan-Júnior R, Simões MV. Effect of different anesthetic agents on left ventricular systolic function assessed by echocardiography in hamsters. ACTA ACUST UNITED AC 2016; 49:e5294. [PMID: 27580004 PMCID: PMC5007073 DOI: 10.1590/1414-431x20165294] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 06/08/2016] [Indexed: 11/23/2022]
Abstract
Determination of left ventricular ejection fraction (LVEF) using in vivo imaging is the cardiac functional parameter most frequently employed in preclinical research. However, there is considerable conflict regarding the effects of anesthetic agents on LVEF. This study aimed at assessing the effects of various anesthetic agents on LVEF in hamsters using transthoracic echocardiography. Twelve female hamsters were submitted to echocardiography imaging separated by 1-week intervals under the following conditions: 1) conscious animals, 2) animals anesthetized with isoflurane (inhaled ISO, 3 L/min), 3) animals anesthetized with thiopental (TP, 50 mg/kg, intraperitoneal), and 4) animals anesthetized with 100 mg/kg ketamine plus 10 mg/kg xylazine injected intramuscularly (K/X). LVEF obtained under the effect of anesthetics (ISO=62.2±3.1%, TP=66.2±2.7% and K/X=75.8±1.6%) was significantly lower than that obtained in conscious animals (87.5±1.7%, P<0.0001). The K/X combination elicited significantly higher LVEF values compared to ISO (P<0.001) and TP (P<0.05). K/X was associated with a lower dispersion of individual LVEF values compared to the other anesthetics. Under K/X, the left ventricular end diastolic diameter (LVdD) was increased (0.60±0.01 cm) compared to conscious animals (0.41±0.02 cm), ISO (0.51±0.02 cm), and TP (0.55±0.01 cm), P<0.0001. The heart rate observed with K/X was significantly lower than in the remaining conditions. These results indicate that the K/X combination may be the best anesthetic option for the in vivo assessment of cardiac systolic function in hamsters, being associated with a lower LVEF reduction compared to the other agents and showing values closer to those of conscious animals with a lower dispersion of results.
Collapse
Affiliation(s)
- D M Tanaka
- Departamento de Medicina Interna, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - M M D Romano
- Departamento de Medicina Interna, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - E E V Carvalho
- Departamento de Medicina Interna, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - L F L Oliveira
- Departamento de Medicina Interna, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - H C D Souza
- Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - B C Maciel
- Departamento de Medicina Interna, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - H C Salgado
- Departamento de Fisiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - R Fazan-Júnior
- Departamento de Fisiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - M V Simões
- Departamento de Medicina Interna, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| |
Collapse
|
12
|
Abstract
The mouse is the mammalian model of choice for investigating cardiovascular biology, given our ability to manipulate it by genetic, pharmacologic, mechanical, and environmental means. Imaging is an important approach to phenotyping both function and structure of cardiac and vascular components. This review details commonly used imaging approaches, with a focus on echocardiography and magnetic resonance imaging and brief overviews of other imaging modalities. We also briefly outline emerging imaging approaches but caution that reliability and validity data may be lacking.
Collapse
Affiliation(s)
- Colin K L Phoon
- Division of Pediatric Cardiology, Department of Pediatrics, New York University School of Medicine, New York, New York
| | - Daniel H Turnbull
- Departments of Radiology and Pathology, New York University School of Medicine, New York, New York.,Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, New York
| |
Collapse
|
13
|
Prasad AM, Morgan DA, Nuno DW, Ketsawatsomkron P, Bair TB, Venema AN, Dibbern ME, Kutschke WJ, Weiss RM, Lamping KG, Chapleau MW, Sigmund CD, Rahmouni K, Grumbach IM. Calcium/calmodulin-dependent kinase II inhibition in smooth muscle reduces angiotensin II-induced hypertension by controlling aortic remodeling and baroreceptor function. J Am Heart Assoc 2015; 4:e001949. [PMID: 26077587 PMCID: PMC4599535 DOI: 10.1161/jaha.115.001949] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Background Multifunctional calcium/calmodulin-dependent kinase II (CaMKII) is activated by angiotensin II (Ang II) in cultured vascular smooth muscle cells (VSMCs), but its function in experimental hypertension has not been explored. The aim of this study was to determine the impact of CaMKII inhibition selectively in VSMCs on Ang II hypertension. Methods and Results Transgenic expression of a CaMKII peptide inhibitor in VSMCs (TG SM-CaMKIIN model) reduced the blood pressure response to chronic Ang II infusion. The aortic depressor nerve activity was reset in hypertensive versus normotensive wild-type animals but not in TG SM-CaMKIIN mice, suggesting that changes in baroreceptor activity account for the blood pressure difference between genotypes. Accordingly, aortic pulse wave velocity, a measure of arterial wall stiffness and a determinant of baroreceptor activity, increased in hypertensive versus normotensive wild-type animals but did not change in TG SM-CaMKIIN mice. Moreover, examination of blood pressure and heart rate under ganglionic blockade revealed that VSMC CaMKII inhibition abolished the augmented efferent sympathetic outflow and renal and splanchnic nerve activity in Ang II hypertension. Consequently, we hypothesized that VSMC CaMKII controls baroreceptor activity by modifying arterial wall remodeling in Ang II hypertension. Gene expression analysis in aortas from normotensive and Ang II–infused mice revealed that TG SM-CaMKIIN aortas were protected from Ang II–induced upregulation of genes that control extracellular matrix production, including collagen. VSMC CaMKII inhibition also strongly altered the expression of muscle contractile genes under Ang II. Conclusions CaMKII in VSMCs regulates blood pressure under Ang II hypertension by controlling structural gene expression, wall stiffness, and baroreceptor activity.
Collapse
Affiliation(s)
- Anand M Prasad
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.)
| | - Donald A Morgan
- Department of Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA (D.A.M., D.W.N., P.K., K.G.L., C.D.S., K.R.)
| | - Daniel W Nuno
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.) Department of Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA (D.A.M., D.W.N., P.K., K.G.L., C.D.S., K.R.)
| | - Pimonrat Ketsawatsomkron
- Department of Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA (D.A.M., D.W.N., P.K., K.G.L., C.D.S., K.R.)
| | - Thomas B Bair
- The Iowa Institute for Human Genetics, Carver College of Medicine, University of Iowa, Iowa City, IA (T.B.B.)
| | - Ashlee N Venema
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.) The Iowa City VA Healthcare System, Iowa City, IA (A.N.V., K.G.L., M.W.C., I.M.G.)
| | - Megan E Dibbern
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.)
| | - William J Kutschke
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.)
| | - Robert M Weiss
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.)
| | - Kathryn G Lamping
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.) Department of Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA (D.A.M., D.W.N., P.K., K.G.L., C.D.S., K.R.) The Iowa City VA Healthcare System, Iowa City, IA (A.N.V., K.G.L., M.W.C., I.M.G.)
| | - Mark W Chapleau
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.) The Iowa City VA Healthcare System, Iowa City, IA (A.N.V., K.G.L., M.W.C., I.M.G.)
| | - Curt D Sigmund
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.) Department of Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA (D.A.M., D.W.N., P.K., K.G.L., C.D.S., K.R.) Department of Molecular Physiology and Biophysics, Carver College of Medicine, University of Iowa, Iowa City, IA (C.D.S.)
| | - Kamal Rahmouni
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.) Department of Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA (D.A.M., D.W.N., P.K., K.G.L., C.D.S., K.R.)
| | - Isabella M Grumbach
- Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA (A.M.P., D.W.N., A.N.V., M.E.D., W.J.K., R.M.W., K.G.L., M.W.C., C.D.S., K.R., I.M.G.) The Iowa City VA Healthcare System, Iowa City, IA (A.N.V., K.G.L., M.W.C., I.M.G.)
| |
Collapse
|
14
|
El Accaoui RN, Gould ST, Hajj GP, Chu Y, Davis MK, Kraft DC, Lund DD, Brooks RM, Doshi H, Zimmerman KA, Kutschke W, Anseth KS, Heistad DD, Weiss RM. Aortic valve sclerosis in mice deficient in endothelial nitric oxide synthase. Am J Physiol Heart Circ Physiol 2014; 306:H1302-13. [PMID: 24610917 DOI: 10.1152/ajpheart.00392.2013] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Risk factors for fibrocalcific aortic valve disease (FCAVD) are associated with systemic decreases in bioavailability of endothelium-derived nitric oxide (EDNO). In patients with bicuspid aortic valve (BAV), vascular expression of endothelial nitric oxide synthase (eNOS) is decreased, and eNOS(-/-) mice have increased prevalence of BAV. The goal of this study was to test the hypotheses that EDNO attenuates profibrotic actions of valve interstitial cells (VICs) in vitro and that EDNO deficiency accelerates development of FCAVD in vivo. As a result of the study, coculture of VICs with aortic valve endothelial cells (vlvECs) significantly decreased VIC activation, a critical early phase of FCAVD. Inhibition of VIC activation by vlvECs was attenuated by N(G)-nitro-l-arginine methyl ester or indomethacin. Coculture with vlvECs attenuated VIC expression of matrix metalloproteinase-9, which depended on stiffness of the culture matrix. Coculture with vlvECs preferentially inhibited collagen-3, compared with collagen-1, gene expression. BAV occurred in 30% of eNOS(-/-) mice. At age 6 mo, collagen was increased in both bicuspid and trileaflet eNOS(-/-) aortic valves, compared with wild-type valves. At 18 mo, total collagen was similar in eNOS(-/-) and wild-type mice, but collagen-3 was preferentially increased in eNOS(-/-) mice. Calcification and apoptosis were significantly increased in BAV of eNOS(-/-) mice at ages 6 and 18 mo. Remarkably, these histological changes were not accompanied by physiologically significant valve stenosis or regurgitation. In conclusion, coculture with vlvECs inhibits specific profibrotic VIC processes. In vivo, eNOS deficiency produces fibrosis in both trileaflet and BAVs but produces calcification only in BAVs.
Collapse
Affiliation(s)
- Ramzi N El Accaoui
- Division of Cardiovascular Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Rygh CB, Løkka G, Heljasvaara R, Taxt T, Pavlin T, Sormunen R, Pihlajaniemi T, Curry FR, Tenstad O, Reed RK. Image-based assessment of microvascular function and structure in collagen XV- and XVIII-deficient mice. J Physiol 2013; 592:325-36. [PMID: 24218547 DOI: 10.1113/jphysiol.2013.263574] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Collagen XV and XVIII are ubiquitous constituents of basement membranes. We aimed to study the physiological roles of these two components of the permeability barrier non-invasively in striated muscle in mice deficient in collagen XV or XVIII by dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). Structural information was obtained with transmission electron microscopy (TEM). MR data were analysed by two different analysis methods to quantify tissue perfusion and microcirculatory exchange parameters to rule out data analysis method-dependent results. Control mice (C57BL/6J Ola/Hsd strain) or mice lacking either collagen XV (Col15a1(-/-)) or XVIII (Col18a1(-/-)) were included in the study. MR images were acquired using a preclinical system using gadodiamide (Gd-DTPA-BMA, molecular weight 0.58 kDa) as a tracer. Exchange capacity (permeability (P)-surface area (S) product relative to blood flow (FB)) was increased in test mice compared to controls, but the contributions from P, S, and FB were different in these two phenotypes. FB was significantly increased in Col18a1(-/-), but slightly decreased in Col15a1(-/-). PS was significantly increased only in Col18a1(-/-) even though P was increased in both phenotypes suggesting S might also be reduced in Col15a1(-/-) mice. Immunohistochemistry and electron microscopy demonstrated alterations in capillary density and morphology in both knockout mouse strains in comparison to the control mice. Both collagen XV and XVIII are important for maintaining normal capillary permeability in the striated muscle. DCE-MRI and the perfusion analyses successfully determined microvascular haemodynamic parameters of genetically modified mice and gave results consistent with more invasive methods.
Collapse
Affiliation(s)
- C B Rygh
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, 5009 Bergen, Norway.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Scott JA, Klutho PJ, El Accaoui R, Nguyen E, Venema AN, Xie L, Jiang S, Dibbern M, Scroggins S, Prasad AM, Luczak ED, Davis MK, Li W, Guan X, Backs J, Schlueter AJ, Weiss RM, Miller FJ, Anderson ME, Grumbach IM. The multifunctional Ca²⁺/calmodulin-dependent kinase IIδ (CaMKIIδ) regulates arteriogenesis in a mouse model of flow-mediated remodeling. PLoS One 2013; 8:e71550. [PMID: 23951185 PMCID: PMC3738514 DOI: 10.1371/journal.pone.0071550] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 07/01/2013] [Indexed: 11/18/2022] Open
Abstract
Objective Sustained hemodynamic stress mediated by high blood flow promotes arteriogenesis, the outward remodeling of existing arteries. Here, we examined whether Ca2+/calmodulin-dependent kinase II (CaMKII) regulates arteriogenesis. Methods and Results Ligation of the left common carotid led to an increase in vessel diameter and perimeter of internal and external elastic lamina in the contralateral, right common carotid. Deletion of CaMKIIδ (CaMKIIδ−/−) abolished this outward remodeling. Carotid ligation increased CaMKII expression and was associated with oxidative activation of CaMKII in the adventitia and endothelium. Remodeling was abrogated in a knock-in model in which oxidative activation of CaMKII is abolished. Early after ligation, matrix metalloproteinase 9 (MMP9) was robustly expressed in the adventitia of right carotid arteries of WT but not CaMKIIδ−/− mice. MMP9 mainly colocalized with adventitial macrophages. In contrast, we did not observe an effect of CaMKIIδ deficiency on other proposed mediators of arteriogenesis such as expression of adhesion molecules or smooth muscle proliferation. Transplantation of WT bone marrow into CaMKIIδ−/− mice normalized flow-mediated remodeling. Conclusion CaMKIIδ is activated by oxidation under high blood flow conditions and is required for flow-mediated remodeling through a mechanism that includes increased MMP9 expression in bone marrow-derived cells invading the arterial wall.
Collapse
Affiliation(s)
- Jason A. Scott
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
- Iowa City VA Medical Center, Iowa City, Iowa, United States of America
| | - Paula J. Klutho
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Ramzi El Accaoui
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Emily Nguyen
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Ashlee N. Venema
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Litao Xie
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
- Iowa City VA Medical Center, Iowa City, Iowa, United States of America
| | - Shuxia Jiang
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Megan Dibbern
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Sabrina Scroggins
- Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Anand M. Prasad
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Elisabeth D. Luczak
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Melissa K. Davis
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Weiwei Li
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Xiaoqun Guan
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Johannes Backs
- Department of Cardiology, University of Heidelberg, Heidelberg, Germany
| | - Annette J. Schlueter
- Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Robert M. Weiss
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Francis J. Miller
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
- Iowa City VA Medical Center, Iowa City, Iowa, United States of America
| | - Mark E. Anderson
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
- Department of Molecular Physiology and Biophysics, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
| | - Isabella M. Grumbach
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America
- Iowa City VA Medical Center, Iowa City, Iowa, United States of America
- * E-mail:
| |
Collapse
|
17
|
Jain R, Petrillo-Albarano T, Parks WJ, Linzer JF, Stockwell JA. Efficacy and safety of deep sedation by non-anesthesiologists for cardiac MRI in children. Pediatr Radiol 2013. [PMID: 23184069 DOI: 10.1007/s00247-012-2566-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Cardiac MRI has become widespread to characterize cardiac lesions in children. No study has examined the role of deep sedation performed by non-anesthesiologists for this investigation. OBJECTIVE We hypothesized that deep sedation provided by non-anesthesiologists can be provided with a similar safety and efficacy profile to general anesthesia provided by anesthesiologists. MATERIALS AND METHODS This is a retrospective chart review of children who underwent cardiac MRI over a 5-year period. The following data were collected from the medical records: demographic data, cardiac lesion, American Society of Anesthesiologists (ASA) physical status, sedation type, provider, medications, sedation duration and adverse events or interventions. Image and sedation adequacy were recorded. RESULTS Of 1,465 studies identified, 1,197 met inclusion criteria; 43 studies (3.6%) used general anesthesia, 506 (42.3%) had deep sedation and eight (0.7%) required anxiolysis only. The remaining 640 studies (53.5%) were performed without sedation. There were two complications in the general anesthesia group (4.7%) versus 17 in the deep sedation group (3.4%). Sedation was considered inadequate in 22 of the 506 deep sedation patients (4.3%). Adequate images were obtained in 95.3% of general anesthesia patients versus 86.6% of deep sedation patients. CONCLUSION There was no difference in the incidence of adverse events or cardiac MRI image adequacy for children receiving general anesthesia by anesthesiologists versus deep sedation by non-anesthesiologists. In summary, this study demonstrates that an appropriately trained sedation provider can provide deep sedation for cardiac MRI without the need for general anesthesia in selected cases.
Collapse
Affiliation(s)
- Rini Jain
- Department of Pediatrics, Division of Emergency Medicine, Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, Canada
| | | | | | | | | |
Collapse
|
18
|
Tyrankiewicz U, Skorka T, Jablonska M, Petkow-Dimitrow P, Chlopicki S. Characterization of the cardiac response to a low and high dose of dobutamine in the mouse model of dilated cardiomyopathy by MRI in vivo. J Magn Reson Imaging 2012; 37:669-77. [DOI: 10.1002/jmri.23854] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Accepted: 09/04/2012] [Indexed: 11/06/2022] Open
|
19
|
Distribution of lipid-based nanoparticles to infarcted myocardium with potential application for MRI-monitored drug delivery. J Control Release 2012; 162:276-85. [PMID: 22771978 DOI: 10.1016/j.jconrel.2012.06.035] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 06/25/2012] [Accepted: 06/27/2012] [Indexed: 11/21/2022]
Abstract
Adverse cardiac remodeling after myocardial infarction ultimately causes heart failure. To stimulate reparative processes in the infarct, efficient delivery and retention of therapeutic agents is desired. This might be achieved by encapsulation of drugs in nanoparticles. The goal of this study was to characterize the distribution pattern of differently sized long-circulating lipid-based nanoparticles, namely micelles (~15 nm) and liposomes (~100 nm), in a mouse model of myocardial infarction (MI). MI was induced in mice (n=38) by permanent occlusion of the left coronary artery. Nanoparticle accumulation following intravenous administration was examined one day and one week after surgery, representing the acute and chronic phase of MI, respectively. In vivo magnetic resonance imaging of paramagnetic lipids in the micelles and liposomes was employed to monitor the trafficking of nanoparticles to the infarcted myocardium. Ex vivo high-resolution fluorescence microscopy of fluorescent lipids was used to determine the exact location of the nanoparticles in the myocardium. In both acute and chronic MI, micelles permeated the entire infarct area, which renders them very suited for the local delivery of cardioprotective or anti-remodeling drugs. Liposomes displayed slower and more restricted extravasation from the vasculature and are therefore an attractive vehicle for the delivery of pro-angiogenic drugs. Importantly, the ability to non-invasively visualize both micelles and liposomes with MRI creates a versatile approach for the development of effective cardioprotective therapeutic interventions.
Collapse
|
20
|
Velocity Vector Imaging Fails to Quantify Regional Myocardial Dysfunction in a Mouse Model of Isoprenaline-Induced Cardiotoxicity. Echocardiography 2012; 29:818-26. [DOI: 10.1111/j.1540-8175.2012.01705.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
21
|
Comparison of Retrospectively Self-Gated and Prospectively Triggered FLASH Sequences for Cine Imaging of the Aorta in Mice at 9.4 Tesla. Invest Radiol 2012; 47:259-66. [DOI: 10.1097/rli.0b013e31823d3eb6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
22
|
Botnar RM, Makowski MR. Cardiovascular magnetic resonance imaging in small animals. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2012; 105:227-61. [PMID: 22137434 DOI: 10.1016/b978-0-12-394596-9.00008-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Noninvasive imaging studies involving small animals are becoming increasingly important in preclinical pharmacological, genetic, and biomedical cardiovascular research. Especially small animal magnetic resonance imaging (MRI) using high field and clinical MRI systems has gained significant importance in recent years. Compared to other imaging modalities, like computer tomography, MRI can provide an excellent soft tissue contrast, which enables the characterization of different kinds of tissues without the use of contrast agents. In addition, imaging can be performed with high spatial and temporal resolution. Small animal MRI cannot only provide anatomical information about the beating murine heart; it can also provide functional and molecular information, which makes it a unique imaging modality. Compared to clinical MRI examinations in humans, small animal MRI is associated with additional challenges. These included a smaller size of all cardiovascular structures and a up to ten times higher heart rate. Dedicated small animal monitoring devices make a reliable cardiac triggering and respiratory gating feasible. MRI in combination with molecular probes enables the noninvasive imaging of biological processes at a molecular level. Different kinds of iron oxide or gadolinium-based contrast agents can be used for this purpose. Compared to other molecular imaging modalities, like single photon emission computed tomography (SPECT) and positron emission tomography (PET), MRI can also provide imaging with high spatial resolution, which is of high importance for the assessment of the cardiovascular system. The sensitivity for detection of MRI contrast agents is however lower compared to sensitivity of radiation associated techniques like PET and SPECT. This chapter is divided into the following sections: (1) "Introduction," (2) "Principals of Magnetic Resonance Imaging," (3) "MRI Systems for Preclinical Imaging and Experimental Setup," and (4) "Cardiovascular Magnetic Resonance Imaging."
Collapse
Affiliation(s)
- René M Botnar
- Division of Imaging Sciences, King's College London, London, United Kingdom
| | | |
Collapse
|
23
|
Pennell DJ, Firmin DN, Kilner PJ, Manning WJ, Mohiaddin RH, Prasad SK. Review of journal of cardiovascular magnetic resonance 2010. J Cardiovasc Magn Reson 2011; 13:48. [PMID: 21914185 PMCID: PMC3182946 DOI: 10.1186/1532-429x-13-48] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Accepted: 09/13/2011] [Indexed: 12/15/2022] Open
Abstract
There were 75 articles published in the Journal of Cardiovascular Magnetic Resonance (JCMR) in 2010, which is a 34% increase in the number of articles since 2009. The quality of the submissions continues to increase, and the editors were delighted with the recent announcement of the JCMR Impact Factor of 4.33 which showed a 90% increase since last year. Our acceptance rate is approximately 30%, but has been falling as the number of articles being submitted has been increasing. In accordance with Open-Access publishing, the JCMR articles go on-line as they are accepted with no collating of the articles into sections or special thematic issues. Last year for the first time, the Editors summarized the papers for the readership into broad areas of interest or theme, which we felt would be useful to practitioners of cardiovascular magnetic resonance (CMR) so that you could review areas of interest from the previous year in a single article in relation to each other and other recent JCMR articles 1. This experiment proved very popular with a very high rate of downloading, and therefore we intend to continue this review annually. The papers are presented in themes and comparison is drawn with previously published JCMR papers to identify the continuity of thought and publication in the journal. We hope that you find the open-access system increases wider reading and citation of your papers, and that you will continue to send your quality manuscripts to JCMR for publication.
Collapse
Affiliation(s)
- Dudley J Pennell
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - David N Firmin
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - Philip J Kilner
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - Warren J Manning
- Department of Medicine (Cardiovascular Division) and Radiology, Beth Israel Deaconess Medical Center, 330 Brookline Avenue, Boston, MA 02215 USA
- Harvard Medical School, 25 Shattuck Street, Boston, MA 02115 USA
| | - Raad H Mohiaddin
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - Sanjay K Prasad
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| |
Collapse
|
24
|
Mouse phenotyping with MRI. Methods Mol Biol 2011. [PMID: 21874500 DOI: 10.1007/978-1-61779-219-9_31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
The field of mouse phenotyping with magnetic resonance imaging (MRI) is rapidly growing, motivated by the need for improved tools for characterizing and evaluating mouse models of human disease. Image results can provide important comparisons of human conditions with mouse disease models, evaluations of treatment, development or disease progression, as well as direction for histological or other investigations. Effective mouse MRI studies require attention to many aspects of experiment design. In this chapter, we provide details and discussion of important practical considerations: hardware requirements, mouse handling for in vivo imaging, specimen preparation for ex vivo imaging, sequence and contrast agent selection, study size, and quantitative image analysis. We focus particularly on anatomical phenotyping, an important and accessible application that has shown a high potential for impact in many mouse models at our imaging center.
Collapse
|
25
|
Abstract
Calcific aortic valve stenosis (CAVS) is a major health problem facing aging societies. The identification of osteoblast-like and osteoclast-like cells in human tissue has led to a major paradigm shift in the field. CAVS was thought to be a passive, degenerative process, whereas now the progression of calcification in CAVS is considered to be actively regulated. Mechanistic studies examining the contributions of true ectopic osteogenesis, nonosseous calcification, and ectopic osteoblast-like cells (that appear to function differently from skeletal osteoblasts) to valvular dysfunction have been facilitated by the development of mouse models of CAVS. Recent studies also suggest that valvular fibrosis, as well as calcification, may play an important role in restricting cusp movement, and CAVS may be more appropriately viewed as a fibrocalcific disease. High-resolution echocardiography and magnetic resonance imaging have emerged as useful tools for testing the efficacy of pharmacological and genetic interventions in vivo. Key studies in humans and animals are reviewed that have shaped current paradigms in the field of CAVS, and suggest promising future areas for research.
Collapse
Affiliation(s)
- Jordan D Miller
- Department of Surgery, Mayo Clinic, Rochester, Minnesota 55905, USA.
| | | | | |
Collapse
|
26
|
Asemu G, Fishbein K, Lao QZ, Ravindran A, Herbert R, Canuto HC, Spencer RG, Soldatov NM. Cardiac phenotype induced by a dysfunctional α 1C transgene: a general problem for the transgenic approach. Channels (Austin) 2011; 5:138-47. [PMID: 21224729 DOI: 10.4161/chan.5.2.14314] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Based on stable integration of recombinant DNA into a host genome, transgenic technology has become an important genetic engineering methodology. An organism whose genetic characteristics have been altered by the insertion of foreign DNA is supposed to exhibit a new phenotype associated with the function of the transgene. However, successful insertion may not be sufficient to achieve specific modification of function. In this study we describe a strain of transgenic mouse, G7-882, generated by incorporation into the mouse genome of human CaV 1.2 α(1C) cDNA deprived of 3'-UTR to exclude transcription. We found that, in response to chronic infusion of isoproterenol, G7-882 develops dilated cardiomyopathy, a misleading "transgenic artifact" compatible with the expected function of the incorporated "correct" transgene. Specifically, using magnetic resonance imaging (MRI), we found that chronic β-adrenergic stimulation of G7-882 mice caused left ventricular hypertrophy and aggravated development of dilated cardiomyopathy, although no significant changes in the kinetics, density and voltage dependence of the calcium current were observed in G7-882 cardiomyocytes as compared to cells from wild type mice. This result illustrates the possibility that even when a functional transgene is expressed, an observed change in phenotype may be due to the artifact of "incidental incorporation" leading to misleading conclusions. To exclude this possibility and thus provide a robust tool for exploring biological function, the new transgenic phenotype must be replicated in several independently generated transgenic strains.
Collapse
Affiliation(s)
- Girma Asemu
- National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | | | | | | | | | | | | | | |
Collapse
|
27
|
Decher N, Wemhöner K, Rinné S, Netter MF, Zuzarte M, Aller MI, Kaufmann SG, Li XT, Meuth SG, Daut J, Sachse FB, Maier SK. Knock-Out of the Potassium Channel TASK-1 Leads to a Prolonged QT Interval and a Disturbed QRS Complex. Cell Physiol Biochem 2011; 28:77-86. [DOI: 10.1159/000331715] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/07/2011] [Indexed: 01/13/2023] Open
|
28
|
Cardiac imaging using clinical 1.5 t MRI scanners in a murine ischemia/reperfusion model. J Biomed Biotechnol 2010; 2011:185683. [PMID: 21151667 PMCID: PMC2997510 DOI: 10.1155/2011/185683] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Accepted: 10/26/2010] [Indexed: 12/18/2022] Open
Abstract
To perform cardiac imaging in mice without having to invest in expensive dedicated equipment, we adapted a clinical 1.5 Tesla (T) magnetic resonance imaging (MRI) scanner for use in a murine ischemia/reperfusion model. Phase-sensitive inversion recovery (PSIR) sequence facilitated the determination of infarct sizes in vivo by late gadolinium enhancement. Results were compared to histological infarct areas in mice after ischemia/reperfusion procedure with a good correlation (r = 0.807, P < .001). In addition, fractional area change (FAC) was assessed with single slice cine MRI and was matched to infarct size (r = −0.837) and fractional shortening (FS) measured with echocardiography (r = 0.860); both P < .001. Here, we demonstrate the use of clinical 1.5 MRI scanners as a feasible method for basic phenotyping in mice. These widely available scanners are capable of investigating in vivo infarct dimensions as well as assessment of cardiac functional parameters in mice with reasonable throughput.
Collapse
|
29
|
Delattre BMA, Braunersreuther V, Hyacinthe JN, Crowe LA, Mach F, Vallée JP. Myocardial infarction quantification with Manganese-Enhanced MRI (MEMRI) in mice using a 3T clinical scanner. NMR IN BIOMEDICINE 2010; 23:503-513. [PMID: 20175138 DOI: 10.1002/nbm.1489] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Manganese (Mn(2+)) was recognized early as an efficient intracellular MR contrast agent to assess cardiomyocyte viability. It had previously been used for the assessment of myocardial infarction in various animal models from pig to mouse. However, whether Manganese-Enhanced MRI (MEMRI) is also able to assess infarction in the acute phase of a coronary occlusion reperfusion model in mice has not yet been demonstrated. This model is of particular interest as it is closer to the situation encountered in the clinical setting. This study aimed to measure infarction volume taking TTC staining as a gold standard, as well as global and regional function before and after Mn(2+) injection using a clinical 3T scanner. The first step of this study was to perform a dose-response curve in order to optimize the injection protocol. Infarction volume measured with MEMRI was strongly correlated to TTC staining. Ejection fraction (EF) and percent wall thickening measurements allowed evaluation of global and regional function. While EF must be measured before Mn(2+) injection to avoid bias introduced by the reduction of contrast in cine images, percent wall thickening can be measured either before or after Mn(2+) injection and depicts accurately infarct related contraction deficit. This study is the first step for further longitudinal studies of cardiac disease in mice on a clinical 3T scanner, a widely available platform.
Collapse
|
30
|
Pennell DJ, Firmin DN, Kilner PJ, Manning WJ, Mohiaddin RH, Neubauer S, Prasad SK. Review of Journal of Cardiovascular Magnetic Resonance 2009. J Cardiovasc Magn Reson 2010; 12:15. [PMID: 20302618 PMCID: PMC2847562 DOI: 10.1186/1532-429x-12-15] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Accepted: 03/19/2010] [Indexed: 11/10/2022] Open
Abstract
There were 56 articles published in the Journal of Cardiovascular Magnetic Resonance in 2009. The editors were impressed with the high quality of the submissions, of which our acceptance rate was about 40%. In accordance with open-access publishing, the articles go on-line as they are accepted with no collating of the articles into sections or special thematic issues. We have therefore chosen to briefly summarise the papers in this article for quick reference for our readers in broad areas of interest, which we feel will be useful to practitioners of cardiovascular magnetic resonance (CMR). In some cases where it is considered useful, the articles are also put into the wider context with a short narrative and recent CMR references. It has been a privilege to serve as the Editor of the JCMR this past year. I hope that you find the open-access system increases wider reading and citation of your papers, and that you will continue to send your quality manuscripts to JCMR for publication.
Collapse
Affiliation(s)
- DJ Pennell
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP UK. National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ UK
| | - DN Firmin
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP UK. National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ UK
| | - PJ Kilner
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP UK. National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ UK
| | - WJ Manning
- Departments of Medicine (Cardiovascular Division) and Radiology, Beth Israel Deaconess Medical Center 330 Brookline Avenue, Boston, MA 02215 USA. Harvard Medical School, 25 Shattuck Street Boston, MA 02115 USA
| | - RH Mohiaddin
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP UK. National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ UK
| | - S Neubauer
- Department of Cardiovascular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK
| | - SK Prasad
- CMR Unit Royal Brompton Hospital, Sydney Street, London SW3 6NP UK. National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ UK
| |
Collapse
|
31
|
Makowski MR, Wiethoff AJ, Jansen CHP, Botnar RM. Cardiovascular MRI in small animals. Expert Rev Cardiovasc Ther 2010; 8:35-47. [PMID: 20014933 DOI: 10.1586/erc.09.126] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Imaging studies of cardiovascular disease in small rodents have become a prerequisite in preclinical cardiovascular research. Transgenic and gene-knockout models of cardiovascular diseases enables the investigation of the influence of single genes or groups of genes on disease pathogenesis. In addition, experimental and genetically altered models provide valuable in vivo platforms to investigate the efficacy of novel drugs and contrast agents. Owing to the excellent soft tissue contrast, high spatial and temporal resolution, as well as the tomographic nature of MRI, anatomy and function can be assessed with unique accuracy and reproducibility. Furthermore, using novel targeted MRI contrast agents, molecular changes associated with cardiovascular disease can be investigated in the same imaging session. This review focuses on recent advances in hardware, imaging sequences and probe design.
Collapse
Affiliation(s)
- Marcus R Makowski
- Division of Imaging Sciences, King's College London, 4th Floor, Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK.
| | | | | | | |
Collapse
|
32
|
Berry CJ, Miller JD, McGroary K, Thedens DR, Young SG, Heistad DD, Weiss RM. Biventricular adaptation to volume overload in mice with aortic regurgitation. J Cardiovasc Magn Reson 2009; 11:27. [PMID: 19671155 PMCID: PMC2731737 DOI: 10.1186/1532-429x-11-27] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2009] [Accepted: 08/11/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Aortic valve regurgitation is usually caused by impaired coaptation of the aortic valve cusps during diastole. Hypercholesterolemia produces aortic valve lipid deposition, fibrosis, and calcification in both mice and humans, which could impair coaptation of cusps. However, a link between hypercholesterolemia and aortic regurgitation has not been established in either species. The purpose of this study was to ascertain the prevalence of aortic regurgitation in hypercholesterolemic mice and to determine its impact on the left and right ventricles. METHODS AND RESULTS Eighty Ldlr-/-/Apob100/100/Mttpfl/fl/Mx1Cre+/+ ("Reversa") hypercholesterolemic mice and 40 control mice were screened for aortic regurgitation (AR) with magnetic resonance imaging at age 7.5 months. The prevalence of AR was 40% in Reversa mice, with moderate or severe regurgitation (AR+) in 19% of mice. In control mice, AR prevalence was 13% (p = 0.004 vs. Reversa), and was invariably trace or mild in severity. In-depth evaluation of cardiac response to volume overload was performed in 12 AR-positive and 12 AR-negative Reversa mice. Regurgitant fraction was 0.34 +/- 0.04 in AR-positive vs. 0.02 +/- 0.01 in AR-negative (mean +/- SE; p < 0.001). AR-positive mice had significantly increased left ventricular end-diastolic volume and mass and reduced ejection fraction in both ventricles. When left ventricular ejection fraction fell below 0.60 in AR-positive (n = 7) mice, remodeling occurred and right ventricular systolic function progressively worsened. CONCLUSION Hypercholesterolemia causes aortic valve regurgitation with moderate prevalence in mice. When present, aortic valve regurgitation causes volume overload and pathological remodeling of both ventricles.
Collapse
Affiliation(s)
- Christopher J Berry
- Division of Cardiovascular Medicine, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Jordan D Miller
- Division of Cardiovascular Surgery, Mayo Clinic and Foundation, Rochester, MN, USA
| | - KellyAnn McGroary
- Division of Cardiovascular Medicine, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Daniel R Thedens
- Department of Radiology, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Stephen G Young
- Departments of Medicine and Human Genetics, David Geffen School of Medicine, University of California Los Angeles, USA
| | - Donald D Heistad
- Division of Cardiovascular Medicine, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Robert M Weiss
- Division of Cardiovascular Medicine, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| |
Collapse
|