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Loiben AM, Chien WM, Friedman CE, Chao LSL, Weber G, Goldstein A, Sniadecki NJ, Murry CE, Yang KC. Cardiomyocyte Apoptosis Is Associated with Contractile Dysfunction in Stem Cell Model of MYH7 E848G Hypertrophic Cardiomyopathy. Int J Mol Sci 2023; 24:4909. [PMID: 36902340 PMCID: PMC10003263 DOI: 10.3390/ijms24054909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/16/2023] [Accepted: 02/21/2023] [Indexed: 03/08/2023] Open
Abstract
Missense mutations in myosin heavy chain 7 (MYH7) are a common cause of hypertrophic cardiomyopathy (HCM), but the molecular mechanisms underlying MYH7-based HCM remain unclear. In this work, we generated cardiomyocytes derived from isogenic human induced pluripotent stem cells to model the heterozygous pathogenic MYH7 missense variant, E848G, which is associated with left ventricular hypertrophy and adult-onset systolic dysfunction. MYH7E848G/+ increased cardiomyocyte size and reduced the maximum twitch forces of engineered heart tissue, consistent with the systolic dysfunction in MYH7E848G/+ HCM patients. Interestingly, MYH7E848G/+ cardiomyocytes more frequently underwent apoptosis that was associated with increased p53 activity relative to controls. However, genetic ablation of TP53 did not rescue cardiomyocyte survival or restore engineered heart tissue twitch force, indicating MYH7E848G/+ cardiomyocyte apoptosis and contractile dysfunction are p53-independent. Overall, our findings suggest that cardiomyocyte apoptosis is associated with the MYH7E848G/+ HCM phenotype in vitro and that future efforts to target p53-independent cell death pathways may be beneficial for the treatment of HCM patients with systolic dysfunction.
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Affiliation(s)
- Alexander M. Loiben
- Institute for Stem Cell and Regenerative Medicine, School of Medicine, University of Washington, Seattle, WA 98109, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA 98109, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
| | - Wei-Ming Chien
- Institute for Stem Cell and Regenerative Medicine, School of Medicine, University of Washington, Seattle, WA 98109, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA 98109, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
- Cardiology/Hospital Specialty Medicine, VA Puget Sound HCS, Seattle, WA 98108, USA
| | - Clayton E. Friedman
- Institute for Stem Cell and Regenerative Medicine, School of Medicine, University of Washington, Seattle, WA 98109, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA 98109, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
| | - Leslie S.-L. Chao
- Institute for Stem Cell and Regenerative Medicine, School of Medicine, University of Washington, Seattle, WA 98109, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA 98109, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
| | - Gerhard Weber
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
| | - Alex Goldstein
- Institute for Stem Cell and Regenerative Medicine, School of Medicine, University of Washington, Seattle, WA 98109, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA 98109, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA
- Department of Lab Medicine and Pathology, University of Washington, Seattle, WA 98195, USA
| | - Nathan J. Sniadecki
- Institute for Stem Cell and Regenerative Medicine, School of Medicine, University of Washington, Seattle, WA 98109, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA 98109, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA
- Department of Lab Medicine and Pathology, University of Washington, Seattle, WA 98195, USA
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Charles E. Murry
- Institute for Stem Cell and Regenerative Medicine, School of Medicine, University of Washington, Seattle, WA 98109, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA 98109, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
- Department of Lab Medicine and Pathology, University of Washington, Seattle, WA 98195, USA
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Kai-Chun Yang
- Institute for Stem Cell and Regenerative Medicine, School of Medicine, University of Washington, Seattle, WA 98109, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA 98109, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA 98109, USA
- Cardiology/Hospital Specialty Medicine, VA Puget Sound HCS, Seattle, WA 98108, USA
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Shi K, Huang S, Li X, Xu HY, Yang MX, Li Y, Guo YK, Yang ZG. Effect of Obesity on Left Ventricular Remodeling and Clinical Outcome in Chinese Patients With Hypertrophic Cardiomyopathy: Assessed by Cardiac MRI. J Magn Reson Imaging 2023; 57:800-809. [PMID: 35715897 DOI: 10.1002/jmri.28306] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 06/01/2022] [Accepted: 06/02/2022] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Obesity is highly prevalent in patients with hypertrophic cardiomyopathy (HCM) and believed to influence its phenotype. PURPOSE To explore the effects of obesity on left ventricular (LV) remodeling and long-term clinical course in Chinese patients with HCM. STUDY TYPE Longitudinal. POPULATION A total of 247 patients with HCM classified according to body mass index (BMI) (normal weight: BMI = 18.0-22.9 kg/m2 [N = 90]; overweight: BMI = 23.0-24.9 kg/m2 [N = 58]; and obese: BMI ≥ 25 kg/m2 [N = 99]). FIELD STRENGTH/SEQUENCE 3.0 T/Balanced steady-state free precession sequence and phase-sensitive inversion recovery late gadolinium enhancement (LGE) sequence. ASSESSMENT LV function and geometry were measured. LV peak strain analysis was performed. The presence and percentage of LGE in the LV were recorded. The endpoints including heart failure, sudden cardiac death, and overall composite outcome were assessed during a median follow-up of 4.1 years (interquartile range, 3.0-6.2 years). STATISTICAL TESTS One-way analysis of variance, Kruskal-Wallis test, or chi-square test; Pearson correlation coefficient (r); multivariable linear regression analysis; Kaplan-Meier survival analysis; and Cox proportional hazards model analysis were conducted. A two-tailed P-value < 0.05 was considered statistically significant. RESULTS Obese patients exhibited a significant progressive increase in LV mass compared with normal-weight patients. The magnitude of all LV strain indices gradually and significantly decreased as BMI increased, whereas LV ejection fraction was not significantly different among BMI groups (P = 0.364). Multivariable linear regression analysis showed that obesity had a significant association with impaired strain indices as well as with indexed LV mass. Multivariable Cox model analysis retained obesity as an independent marker for future endpoints, and conveyed a > 3-fold increase in risk compared with patients with normal weight (hazard ratio, 3.04; 95% confidence interval, 1.07-6.57). DATA CONCLUSION Obesity is an important environmental modifier that is associated with adverse LV remodeling and is independently associated with future clinical outcomes in Chinese patients with HCM. LEVEL OF EVIDENCE 3 TECHNICAL EFFICACY: Stage 2.
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Affiliation(s)
- Ke Shi
- Department of Radiology, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Shan Huang
- Department of Radiology, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Xiang Li
- Department of Radiology, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Hua-Yan Xu
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Meng-Xi Yang
- Department of Radiology, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu, Sichuan, China.,Department of Radiology, Sichuan Cancer Hospital and Institute, Sichuan Cancer Center, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Yuan Li
- Department of Radiology, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Ying-Kun Guo
- Department of Radiology, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Zhi-Gang Yang
- Department of Radiology, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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3
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Ribeiro F, Alves PKN, Bechara LRG, Ferreira JCB, Labeit S, Moriscot AS. Small-Molecule Inhibition of MuRF1 Prevents Early Disuse-Induced Diaphragmatic Dysfunction and Atrophy. Int J Mol Sci 2023; 24:ijms24043637. [PMID: 36835047 PMCID: PMC9965746 DOI: 10.3390/ijms24043637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 02/07/2023] [Accepted: 02/09/2023] [Indexed: 02/16/2023] Open
Abstract
In clinical conditions such as diaphragm paralysis or mechanical ventilation, disuse-induced diaphragmatic dysfunction (DIDD) is a condition that poses a threat to life. MuRF1 is a key E3-ligase involved in regulating skeletal muscle mass, function, and metabolism, which contributes to the onset of DIDD. We investigated if the small-molecule mediated inhibition of MuRF1 activity (MyoMed-205) protects against early DIDD after 12 h of unilateral diaphragm denervation. Wistar rats were used in this study to determine the compound's acute toxicity and optimal dosage. For potential DIDD treatment efficacy, diaphragm contractile function and fiber cross-sectional area (CSA) were evaluated. Western blotting investigated potential mechanisms underlying MyoMed-205's effects in early DIDD. Our results indicate 50 mg/kg bw MyoMed-205 as a suitable dosage to prevent early diaphragmatic contractile dysfunction and atrophy following 12 h of denervation without detectable signs of acute toxicity. Mechanistically, treatment did not affect disuse-induced oxidative stress (4-HNE) increase, whereas phosphorylation of (ser632) HDAC4 was normalized. MyoMed-205 also mitigated FoxO1 activation, inhibited MuRF2, and increased phospho (ser473) Akt protein levels. These findings may suggest that MuRF1 activity significantly contributes to early DIDD pathophysiology. Novel strategies targeting MuRF1 (e.g., MyoMed-205) have potential therapeutic applications for treating early DIDD.
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Affiliation(s)
- Fernando Ribeiro
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil
| | - Paula K. N. Alves
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil
| | - Luiz R. G. Bechara
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil
| | - Julio C. B. Ferreira
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil
| | - Siegfried Labeit
- DZHK Partner Site Mannheim-Heidelberg, Medical Faculty Mannheim, University of Heidelberg, 68169 Mannheim, Germany
- Myomedix GmbH, 69151 Neckargemünd, Germany
| | - Anselmo S. Moriscot
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, Brazil
- Correspondence: ; Tel.: +55-11-3091-0946
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Hegner P, Lebek S, Schaner B, Ofner F, Gugg M, Maier LS, Arzt M, Wagner S. CaMKII-Dependent Contractile Dysfunction and Pro-Arrhythmic Activity in a Mouse Model of Obstructive Sleep Apnea. Antioxidants (Basel) 2023; 12:antiox12020315. [PMID: 36829874 PMCID: PMC9952298 DOI: 10.3390/antiox12020315] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/23/2023] [Accepted: 01/25/2023] [Indexed: 01/31/2023] Open
Abstract
Left ventricular contractile dysfunction and arrhythmias frequently occur in patients with sleep-disordered breathing (SDB). The CaMKII-dependent dysregulation of cellular Ca homeostasis has recently been described in SDB patients, but these studies only partly explain the mechanism and are limited by the patients' heterogeneity. Here, we analyzed contractile function and Ca homeostasis in a mouse model of obstructive sleep apnea (OSA) that is not limited by confounding comorbidities. OSA was induced by artificial tongue enlargement with polytetrafluorethylene (PTFE) injection into the tongue of wildtype mice and mice with a genetic ablation of the oxidative activation sites of CaMKII (MMVV knock-in). After eight weeks, cardiac function was assessed with echocardiography. Reactive oxygen species (ROS) and Ca transients were measured using confocal and epifluorescence microscopy, respectively. Wildtype PTFE mice exhibited an impaired ejection fraction, while MMVV PTFE mice were fully protected. As expected, isolated cardiomyocytes from PTFE mice showed increased ROS production. We further observed decreased levels of steady-state Ca transients, decreased levels of caffeine-induced Ca transients, and increased pro-arrhythmic activity (defined as deviations from the diastolic Ca baseline) only in wildtype but not in MMVV PTFE mice. In summary, in the absence of any comorbidities, OSA was associated with contractile dysfunction and pro-arrhythmic activity and the inhibition of the oxidative activation of CaMKII conveyed cardioprotection, which may have therapeutic implications.
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Affiliation(s)
- Philipp Hegner
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Simon Lebek
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Benedikt Schaner
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Florian Ofner
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Mathias Gugg
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Lars Siegfried Maier
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Michael Arzt
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Stefan Wagner
- Department of Internal Medicine II, University Hospital Regensburg, 93053 Regensburg, Germany
- Correspondence:
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5
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Loiben AM, Chien WM, Friedman CE, Chao LSL, Weber G, Goldstein A, Sniadecki N, Murry CE, Yang KC. Cardiomyocyte apoptosis contributes to contractile dysfunction in stem cell model of MYH7 E848G hypertrophic cardiomyopathy. bioRxiv 2023:2023.01.24.525458. [PMID: 36747800 PMCID: PMC9900838 DOI: 10.1101/2023.01.24.525458] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Missense mutations in myosin heavy chain 7 ( MYH7 ) are a common cause of hyper-trophic cardiomyopathy (HCM), but the molecular mechanisms underlying MYH7 -based HCM remain unclear. In this work, we generated cardiomyocytes derived from isogenic human induced pluripotent stem cells to model the heterozygous pathogenic MYH7 missense variant, E848G, which is associated with left ventricular hypertrophy and adultonset systolic dysfunction. MYH7 E848G/+ increased cardiomyocyte size and reduced the maximum twitch forces of engineered heart tissue, consistent with the systolic dysfunction in MYH7 E848G HCM patients. Interestingly, MYH7 E848G/+ cardiomyocytes more frequently underwent apoptosis that was associated with increased p53 activity relative to controls. However, genetic ablation of TP53 did not rescue cardiomyocyte survival or restore engineered heart tissue twitch force, indicating MYH7 E848G/+ cardiomyocyte apoptosis and contractile dysfunction are p53-independent. Overall, our findings suggest that cardiomyocyte apoptosis plays an important role in the MYH7 E848G/+ HCM phenotype in vitro and that future efforts to target p53-independent cell death pathways may be beneficial for the treatment of HCM patients with systolic dysfunction.
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Affiliation(s)
- Alexander M. Loiben
- Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
| | - Wei-Ming Chien
- Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
- Cardiology/Hospital Specialty Medicine, VA Puget Sound HCS, Seattle, WA, USA
| | - Clayton E. Friedman
- Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
| | - Leslie S-L. Chao
- Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
| | - Gerhard Weber
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
| | - Alex Goldstein
- Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA
- Department of Lab Medicine and Pathology, University of Washington, Seattle, WA, USA
| | - Nathan Sniadecki
- Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA
- Department of Bioengineering, University of Washington, Seattle, WA, USA
- Department of Lab Medicine and Pathology, University of Washington, Seattle, WA, USA
| | - Charles E. Murry
- Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
- Department of Bioengineering, University of Washington, Seattle, WA, USA
- Department of Lab Medicine and Pathology, University of Washington, Seattle, WA, USA
| | - Kai-Chun Yang
- Institute for Stem Cell and Regenerative Medicine, University of Washington, School of Medicine, Seattle, WA, USA
- Center for Cardiovascular Biology, University of Washington, Seattle, WA, USA
- Department of Medicine/Cardiology, University of Washington, Seattle, WA, USA
- Cardiology/Hospital Specialty Medicine, VA Puget Sound HCS, Seattle, WA, USA
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Davis MJ, Scallan JP, Castorena-Gonzalez JA, Kim HJ, Ying LH, Pin YK, Angeli V. Multiple aspects of lymphatic dysfunction in an ApoE -/- mouse model of hypercholesterolemia. Front Physiol 2022; 13:1098408. [PMID: 36685213 PMCID: PMC9852907 DOI: 10.3389/fphys.2022.1098408] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 12/19/2022] [Indexed: 01/07/2023] Open
Abstract
Introduction: Rodent models of cardiovascular disease have uncovered various types of lymphatic vessel dysfunction that occur in association with atherosclerosis, type II diabetes and obesity. Previously, we presented in vivo evidence for impaired lymphatic drainage in apolipoprotein E null (ApoE -/- ) mice fed a high fat diet (HFD). Whether this impairment relates to the dysfunction of collecting lymphatics remains an open question. The ApoE -/- mouse is a well-established model of cardiovascular disease, in which a diet rich in fat and cholesterol on an ApoE deficient background accelerates the development of hypercholesteremia, atherosclerotic plaques and inflammation of the skin and other tissues. Here, we investigated various aspects of lymphatic function using ex vivo tests of collecting lymphatic vessels from ApoE +/+ or ApoE -/- mice fed a HFD. Methods: Popliteal collectors were excised from either strain and studied under defined conditions in which we could quantify changes in lymphatic contractile strength, lymph pump output, secondary valve function, and collecting vessel permeability. Results: Our results show that all these aspects of lymphatic vessel function are altered in deleterious ways in this model of hypercholesterolemia. Discussion: These findings extend previous in vivo observations suggesting significant dysfunction of lymphatic endothelial cells and smooth muscle cells from collecting vessels in association with a HFD on an ApoE-deficient background. An implication of our study is that collecting vessel dysfunction in this context may negatively impact the removal of cholesterol by the lymphatic system from the skin and the arterial wall and thereby exacerbate the progression and/or severity of atherosclerosis and associated inflammation.
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Affiliation(s)
- Michael J Davis
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO, United States
| | - Joshua P Scallan
- Department of Molecular Pharmacology, University of South Florida, Tampa, FL, United States
| | | | - Hae Jin Kim
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO, United States
| | - Lim Hwee Ying
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, Department of Microbiology and Immunology, National University of Singapore, Singapore, Singapore
| | - Yeo Kim Pin
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, Department of Microbiology and Immunology, National University of Singapore, Singapore, Singapore.,Immunology Programme, Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Veronique Angeli
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, Department of Microbiology and Immunology, National University of Singapore, Singapore, Singapore.,Immunology Programme, Life Sciences Institute, National University of Singapore, Singapore, Singapore
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Uchimura T, Asano T, Nakata T, Hotta A, Sakurai H. A muscle fatigue-like contractile decline was recapitulated using skeletal myotubes from Duchenne muscular dystrophy patient-derived iPSCs. Cell Rep Med 2021; 2:100298. [PMID: 34195678 PMCID: PMC8233665 DOI: 10.1016/j.xcrm.2021.100298] [Citation(s) in RCA: 13] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 01/28/2021] [Accepted: 05/10/2021] [Indexed: 02/07/2023]
Abstract
Duchenne muscular dystrophy (DMD) is a muscle degenerating disease caused by dystrophin deficiency, for which therapeutic options are limited. To facilitate drug development, it is desirable to develop in vitro disease models that enable the evaluation of DMD declines in contractile performance. Here, we show MYOD1-induced differentiation of hiPSCs into functional skeletal myotubes in vitro with collagen gel and electrical field stimulation (EFS). Long-term EFS training (0.5 Hz, 20 V, 2 ms, continuous for 2 weeks) mimicking muscle overuse recapitulates declines in contractile performance in dystrophic myotubes. A screening of clinically relevant drugs using this model detects three compounds that ameliorate this decline. Furthermore, we validate the feasibility of adapting the model to a 96-well culture system using optogenetic technology for large-scale screening. Our results support a disease model using patient-derived iPSCs that allows for the recapitulation of the contractile pathogenesis of DMD and a screening strategy for drug development.
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Affiliation(s)
- Tomoya Uchimura
- Center for iPS Cell Research and Application (CiRA), Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.,Takeda-CiRA Joint Program, Fujisawa, Kanagawa 251-8555, Japan
| | - Toshifumi Asano
- Department of Cell Biology, Graduate School of Medical and Dental Science, Tokyo Medical and Dental University, Tokyo 113-8510, Japan.,The Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Takao Nakata
- Department of Cell Biology, Graduate School of Medical and Dental Science, Tokyo Medical and Dental University, Tokyo 113-8510, Japan.,The Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
| | - Akitsu Hotta
- Center for iPS Cell Research and Application (CiRA), Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.,Takeda-CiRA Joint Program, Fujisawa, Kanagawa 251-8555, Japan
| | - Hidetoshi Sakurai
- Center for iPS Cell Research and Application (CiRA), Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.,Takeda-CiRA Joint Program, Fujisawa, Kanagawa 251-8555, Japan
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8
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Shen X, Zhang L, Jiang L, Xiong W, Tang Y, Lin L, Yu T. Alteration of sphingosine-1-phosphate with aging induces contractile dysfunction of colonic smooth muscle cells via Ca 2+ -activated K + channel (BK Ca ) upregulation. Neurogastroenterol Motil 2021; 33:e14052. [PMID: 33452855 DOI: 10.1111/nmo.14052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 10/13/2020] [Accepted: 11/13/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND Age-associated changes alter calcium-activated potassium channel (BKCa ) expression of colon. Sphingolipids (SLs) are important cell membrane structural components; altered composition of SLs may affect BKCa expression. This study investigated the mechanism by which sphingosine-1-phosphate (S1P) contributes to age-associated contractile dysfunction. METHODS Fifty male Sprague Dawley rats of different ages were randomly assigned to five age-groups, namely 3, 6, 12, 18, and 24 months. BKCa expression, S1P levels, and phosphorylated myosin light chain (p-MLC) levels were tested in colonic tissues. In the absence and presence of S1P treatment, BKCa expression, p-MLC levels, and intracellular calcium mobilization were tested in vitro. BKCa small interfering RNA (siRNA) was used to investigate whether p-MLC expression and calcium mobilization were affected by BKCa in colonic smooth muscle cells (SMCs). The expressions of phosphorylated protein kinase B, c-Jun N-terminal kinases (JNKs), extracellular-regulated protein kinases, nuclear factor kappa-B (NF-κB), and protein kinase Cζ (PKCζ ) were examined to investigate the correlation between S1P and BKCa . KEY RESULTS Sphingosine-1-phosphate levels and sphingosine-1-phosphate receptor 2 (S1PR2) and BKCa expressions were upregulated and p-MLC expression was downregulated in the colonic tissues, age dependently. In the cultured SMCs, S1P treatment increased BKCa expression and reduced calcium concentration and p-MLC was observed. BKCa siRNA increased calcium concentration, and p-MLC levels significantly compared with control. We also showed that S1P upregulated BKCa through PKCζ , JNK, and NF-κB pathways. CONCLUSIONS AND INFERENCES In conclusion, S1P and S1PR2 participate in age-associated contractile dysfunction via BKCa upregulation through PKCζ , JNK, and NF-κB pathways.
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Affiliation(s)
- Xiaoxue Shen
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Ling Zhang
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Ling Jiang
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Wenjie Xiong
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yurong Tang
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Lin Lin
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Ting Yu
- Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
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9
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Cimiotti D, Budde H, Hassoun R, Jaquet K. Genetic Restrictive Cardiomyopathy: Causes and Consequences-An Integrative Approach. Int J Mol Sci 2021; 22:E558. [PMID: 33429969 DOI: 10.3390/ijms22020558] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 01/05/2021] [Accepted: 01/06/2021] [Indexed: 12/12/2022] Open
Abstract
The sarcomere as the smallest contractile unit is prone to alterations in its functional, structural and associated proteins. Sarcomeric dysfunction leads to heart failure or cardiomyopathies like hypertrophic (HCM) or restrictive cardiomyopathy (RCM) etc. Genetic based RCM, a very rare but severe disease with a high mortality rate, might be induced by mutations in genes of non-sarcomeric, sarcomeric and sarcomere associated proteins. In this review, we discuss the functional effects in correlation to the phenotype and present an integrated model for the development of genetic RCM.
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10
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Alvarado G, Tóth A, Csősz É, Kalló G, Dankó K, Csernátony Z, Smith A, Gram M, Akerström B, Édes I, Balla G, Papp Z, Balla J. Heme-Induced Oxidation of Cysteine Groups of Myofilament Proteins Leads to Contractile Dysfunction of Permeabilized Human Skeletal Muscle Fibres. Int J Mol Sci 2020; 21:ijms21218172. [PMID: 33142923 PMCID: PMC7663642 DOI: 10.3390/ijms21218172] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 10/21/2020] [Accepted: 10/30/2020] [Indexed: 02/07/2023] Open
Abstract
Heme released from red blood cells targets a number of cell components including the cytoskeleton. The purpose of the present study was to determine the impact of free heme (20–300 µM) on human skeletal muscle fibres made available during orthopedic surgery. Isometric force production and oxidative protein modifications were monitored in permeabilized skeletal muscle fibre segments. A single heme exposure (20 µM) to muscle fibres decreased Ca2+-activated maximal (active) force (Fo) by about 50% and evoked an approximately 3-fold increase in Ca2+-independent (passive) force (Fpassive). Oxidation of sulfhydryl (SH) groups was detected in structural proteins (e.g., nebulin, α-actinin, meromyosin 2) and in contractile proteins (e.g., myosin heavy chain and myosin-binding protein C) as well as in titin in the presence of 300 µM heme. This SH oxidation was not reversed by dithiothreitol (50 mM). Sulfenic acid (SOH) formation was also detected in the structural proteins (nebulin, α-actinin, meromyosin). Heme effects on SH oxidation and SOH formation were prevented by hemopexin (Hpx) and α1-microglobulin (A1M). These data suggest that free heme has a significant impact on human skeletal muscle fibres, whereby oxidative alterations in structural and contractile proteins limit contractile function. This may explain and or contribute to the weakness and increase of skeletal muscle stiffness in chronic heart failure, rhabdomyolysis, and other hemolytic diseases. Therefore, therapeutic use of Hpx and A1M supplementation might be effective in preventing heme-induced skeletal muscle alterations.
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Affiliation(s)
- Gerardo Alvarado
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, H-4032 Debrecen, Hungary; (G.A.); (A.T.)
- Division of Clinical Physiology, Department of Cardiology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary;
| | - Attila Tóth
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, H-4032 Debrecen, Hungary; (G.A.); (A.T.)
- Division of Clinical Physiology, Department of Cardiology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary;
| | - Éva Csősz
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary; (É.C.); (G.K.)
| | - Gergő Kalló
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary; (É.C.); (G.K.)
| | - Katalin Dankó
- Department of Rheumatology, Institute of Internal Medicine, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary;
| | - Zoltán Csernátony
- Department of Orthopedics, Faculty of Medicine, University of Debrecen, H-4012 Debrecen, Hungary;
| | - Ann Smith
- Department of Cell and Molecular Biology and Biochemistry, School of Biological and Chemical Sciences, University of Missouri-Kansas City, Missouri, MO 64110, USA;
| | - Magnus Gram
- Department of Clinical Sciences Lund, Pediatrics, Lund University, 22184 Lund, Sweden;
| | - Bo Akerström
- Department of Clinical Sciences Lund, Infection Medicine, Lund University, 22184 Lund, Sweden;
| | - István Édes
- Division of Clinical Physiology, Department of Cardiology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary;
| | - György Balla
- Institute of Pediatrics, Faculty of Medicine, University of Debrecen, H-4012 Debrecen, Hungary;
| | - Zoltán Papp
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, H-4032 Debrecen, Hungary; (G.A.); (A.T.)
- Division of Clinical Physiology, Department of Cardiology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary;
- Correspondence: (Z.P.); (J.B.); Tel./Fax: +36-(52)-411717 (Z.P.); +36-(52)-413653 (J.B.)
| | - József Balla
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, H-4032 Debrecen, Hungary; (G.A.); (A.T.)
- Department of Nephrology, Institute of Medicine, Faculty of Medicine, University of Debrecen, H-4012 Debrecen, Hungary
- Correspondence: (Z.P.); (J.B.); Tel./Fax: +36-(52)-411717 (Z.P.); +36-(52)-413653 (J.B.)
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11
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Aslam N. Increase in PKCα Activity during Heart Failure Despite the Stimulation of PKCα Braking Mechanism. Int J Mol Sci 2020; 21:E2561. [PMID: 32272716 DOI: 10.3390/ijms21072561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 03/31/2020] [Accepted: 04/03/2020] [Indexed: 11/29/2022] Open
Abstract
Rationale: Heart failure (HF) is marked by dampened cardiac contractility. A mild therapeutic target that improves contractile function without desensitizing the β-adrenergic system during HF may improve cardiac contractility and potentially survival. Inhibiting protein kinase C α (PKCα) activity may fit the criteria of a therapeutic target with milder systemic effects that still boosts contractility in HF patients. PKCα activity has been observed to increase during HF. This increase in PKCα activity is perplexing because it is also accompanied by up-regulation of a molecular braking mechanism. Objective: I aim to explore how PKCα activity can be increased and maintained during HF despite the presence of a molecular braking mechanism. Methods and Results: Using a computational approach, I show that the local diacylglycerol (DAG) signaling is regulated through a two-compartment signaling system in cardiomyocytes. These results imply that after massive myocardial infarction (MI), local homeostasis of DAG signaling is disrupted. The loss of this balance leads to prolonged activation of PKCα, a key molecular target linked to LV remodeling and dysfunctional filling and ejection in the mammalian heart. This study also proposes an explanation for how DAG homeostasis is regulated during normal systolic and diastolic cardiac function. Conclusions: I developed a novel two-compartment computational model for regulating DAG homeostasis during Ang II-induced heart failure. This model provides a promising tool with which to study mechanisms of DAG signaling regulation during heart failure. The model can also aid in identification of novel therapeutic targets with the aim of improving the quality of life for heart failure patients.
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12
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Wang X, Shen X, Weil BR, Young RF, Canty JM, Qu J. Quantitative proteomic and phosphoproteomic profiling of ischemic myocardial stunning in swine. Am J Physiol Heart Circ Physiol 2020; 318:H1256-H1271. [PMID: 32223553 DOI: 10.1152/ajpheart.00713.2019] [Citation(s) in RCA: 5] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Despite decades of research on the pathophysiology of myocardial stunning, protein changes and/or phosphorylation status underlying alterations in cardiac function/structure remain inadequately understood. Here, we utilized comprehensive and quantitative proteomic and phosphoproteomic approaches to explore molecular mechanisms of myocardial stunning in swine. The closed-chest swine (n = 5 pigs) were subjected to a 10-min left anterior descending coronary artery (LAD) occlusion producing regional myocardial stunning. Tissues from the ischemic LAD region and a remote nonischemic area of the left ventricle were collected 1 h after reperfusion. Ion current-based proteomics (IonStar) and quantitative phosphoproteomics were employed in parallel to identify alterations in protein level and site-specific phosphorylation changes. A novel swine heart protein database exhibiting high accuracy and low redundancy was developed here to facilitate comprehensive study. Further informatic investigations identified potential protein-protein interactions in stunned myocardium. In total, we quantified 2,099 protein groups and 4,699 phosphorylation sites with only 0.4% missing values. Proteomic analyses revealed downregulation of contractile function and extracellular matrix remodeling. Meanwhile, alterations in phosphorylation linked with contractile dysfunction and apoptotic cell death were uncovered. NetworKIN/STRING analysis predicted regulatory kinases responsible for altered phosphosites, such as protein kinase C-mediated phosphorylation of cardiac troponin I-S199 and CaMKII-mediated phosphorylation of phospholamban-T17. In summary, the ion current-based proteomics and phosphoproteomics reliably identified novel alterations in protein content and phosphorylation contributing to contractile dysfunction, extracellular matrix (ECM) damage, and programmed cell death in stunned myocardium, which corroborate well with our physiological observations. Moreover, this work developed a comprehensive database of the swine heart proteome, a highly valuable resource for future translational research in porcine models with cardiovascular diseases.NEW & NOTEWORTHY We first used ion current-based proteomics and phosphoproteomics to reliably identify novel alterations in protein expression and phosphorylation contributing to contractile dysfunction, extracellular matrix (ECM) damage, and programmed cell death in stunned myocardium and developed a comprehensive swine heart-specific proteome database, which provides a valuable resource for future research in porcine models of cardiovascular diseases.
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Affiliation(s)
- Xue Wang
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, New York.,New York State Center of Excellence in Bioinformatics and Life Sciences, University at Buffalo, Buffalo, New York
| | - Xiaomeng Shen
- New York State Center of Excellence in Bioinformatics and Life Sciences, University at Buffalo, Buffalo, New York.,Department of Biochemistry, University at Buffalo, Buffalo, New York
| | - Brian R Weil
- Department of Physiology and Biophysics, University at Buffalo, Buffalo, New York
| | - Rebeccah F Young
- Clinical and Translational Research Center, University at Buffalo, Buffalo, New York.,Division of Cardiovascular Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
| | - John M Canty
- Department of Physiology and Biophysics, University at Buffalo, Buffalo, New York.,Veterans Affairs Western New York Healthcare System, Buffalo, New York.,Clinical and Translational Research Center, University at Buffalo, Buffalo, New York.,Division of Cardiovascular Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York
| | - Jun Qu
- Department of Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, New York.,New York State Center of Excellence in Bioinformatics and Life Sciences, University at Buffalo, Buffalo, New York.,Department of Biochemistry, University at Buffalo, Buffalo, New York.,Department of Pharmaceutical Sciences, University at Buffalo, Buffalo, New York
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13
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Shen L, Li C, Zhang H, Qiu S, Fu T, Xu Y. Downregulation of miR-146a Contributes to Cardiac Dysfunction Induced by the Tyrosine Kinase Inhibitor Sunitinib. Front Pharmacol 2019; 10:914. [PMID: 31507414 PMCID: PMC6716347 DOI: 10.3389/fphar.2019.00914] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Accepted: 07/19/2019] [Indexed: 12/15/2022] Open
Abstract
The main adverse effect of tyrosine kinase inhibitors, such as sunitinib, is cardiac contractile dysfunction; however, the molecular mechanisms of this effect remain largely obscure. MicroRNAs (miRNAs) are key regulatory factors in both cardiovascular diseases and the tyrosine kinase pathway. Therefore, we analyzed the differential expression of miRNAs in the myocardium in mice after exposure to sunitinib using miRNA microarray. A significant downregulation of miR-146a was observed in the myocardium of sunitinib-treated mice, along with a 20% decrease in left ventricle ejection fraction (LVEF). The downregulation of miR-146a was further validated by RT-qPCR. Among the potential targets of miR-146a, we focused on Pln and Ank2, which are closely related to cardiac contractile dysfunction. Results of luciferase reporter assay confirmed that miR-146a directly targeted the 3′ untranslated region of Pln and Ank2. Significant upregulation of PLN and ANK2 at the mRNA and protein levels was observed in the myocardium of sunitinib-treated mice. Cardiac-specific overexpression of miR-146a prevented the deteriorate effect of SNT on calcium transients, thereby alleviating the decreased contractility of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs). SiRNA knockdown of PLN or ANK2 prevented sunitinib-induced suppression of contractility in hiPSC-CMs. Therefore, our in vivo and in vitro results showed that sunitinib downregulated miR-146a, which contributes to cardiac contractile dysfunction by regulating the downstream targets PLN and ANK2, and that upregulation of miR-146a alleviated the inhibitory effect of SNT on cardiac contractility. Thus, miR-146a could be a useful protective agent against sunitinib-induced cardiac dysfunction.
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Affiliation(s)
- Li Shen
- Department of Pharmacology, Hebei Medical University, The Key Laboratory of New Drug Pharmacology and Toxicology, Hebei Province, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China
| | - Congxin Li
- Department of Pharmacology, Hebei Medical University, The Key Laboratory of New Drug Pharmacology and Toxicology, Hebei Province, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China
| | - Hua Zhang
- Department of Pharmacology, Hebei Medical University, The Key Laboratory of New Drug Pharmacology and Toxicology, Hebei Province, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China
| | - Suhua Qiu
- Department of Pharmacology, Hebei Medical University, The Key Laboratory of New Drug Pharmacology and Toxicology, Hebei Province, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China
| | - Tian Fu
- Department of Pharmacology, Hebei Medical University, The Key Laboratory of New Drug Pharmacology and Toxicology, Hebei Province, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China
| | - Yanfang Xu
- Department of Pharmacology, Hebei Medical University, The Key Laboratory of New Drug Pharmacology and Toxicology, Hebei Province, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China
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14
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Karisnan K, Mahzabin T, Bakker AJ, Song Y, Noble PB, Pillow JJ, Pinniger GJ. Gestational age at time of in utero lipopolysaccharide exposure influences the severity of inflammation-induced diaphragm weakness in lambs. Am J Physiol Regul Integr Comp Physiol 2017; 314:R523-R532. [PMID: 29212808 DOI: 10.1152/ajpregu.00150.2017] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The preterm diaphragm is functionally immature compared with its term counterpart. In utero inflammation further exacerbates preterm diaphragm dysfunction. We hypothesized that preterm lambs are more vulnerable to in utero inflammation-induced diaphragm dysfunction compared with term lambs. Pregnant ewes received intra-amniotic (IA) injections of saline or 10 mg lipopolysaccharide (LPS) 2 or 7 days before delivery at 121 days (preterm) or ∼145 days (term) of gestation. Diaphragm contractile function was assessed in vitro. Plasma cytokines, diaphragm myosin heavy chain (MHC) isoforms, and oxidative stress were evaluated. Maximum diaphragm force in preterm control lambs was significantly lower (22%) than in term control lambs ( P < 0.001). Despite similar inflammatory cytokine responses to in utero LPS exposure, diaphragm function in preterm and term lambs was affected differentially. In term lambs, maximum force after a 2-day LPS exposure was significantly lower than in controls (by ~20%, P < 0.05). In preterm lambs, maximum forces after 2-day and 7-day LPS exposures were significantly lower than in controls (by ~30%, P < 0.05). Peak twitch force after LPS exposure was significantly lower in preterm than in controls, but not in term lambs. In term lambs, LPS exposure increased the proportion of MHC-I fibers, increased twitch contraction times, and increased fatigue resistance relative to controls. In preterm diaphragm, the cross-sectional area of embryonic MHC fibers was significantly lower after 7-day versus 2-day LPS exposures. We conclude that preterm lambs are more vulnerable to IA LPS-induced diaphragm dysfunction than term lambs. In utero inflammation exacerbates diaphragm dysfunction and may increase susceptibility to postnatal respiratory failure.
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Affiliation(s)
- Kanakeswary Karisnan
- School of Human Sciences, The University of Western Australia , Crawley , Australia.,School of Medicine, Perdana University -Royal College of Surgeons in Ireland , Selangor , Malaysia
| | - Tanzila Mahzabin
- School of Human Sciences, The University of Western Australia , Crawley , Australia
| | - Anthony J Bakker
- School of Human Sciences, The University of Western Australia , Crawley , Australia
| | - Yong Song
- School of Human Sciences, The University of Western Australia , Crawley , Australia.,Centre for Neonatal Research and Education, School of Paediatrics and Child Health, The University of Western Australia , Crawley , Australia.,School of Medicine, Perdana University -Royal College of Surgeons in Ireland , Selangor , Malaysia
| | - Peter B Noble
- School of Human Sciences, The University of Western Australia , Crawley , Australia.,Centre for Neonatal Research and Education, School of Paediatrics and Child Health, The University of Western Australia , Crawley , Australia
| | - J Jane Pillow
- School of Human Sciences, The University of Western Australia , Crawley , Australia.,Centre for Neonatal Research and Education, School of Paediatrics and Child Health, The University of Western Australia , Crawley , Australia
| | - Gavin J Pinniger
- School of Human Sciences, The University of Western Australia , Crawley , Australia
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15
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Kar J, Cupps B, Zhong X, Koerner D, Kulshrestha K, Neudecker S, Bell J, Craddock H, Pasque M. Preliminary investigation of multiparametric strain Z-score (MPZS) computation using displacement encoding with simulated echoes (DENSE) and radial point interpretation method (RPIM). J Magn Reson Imaging 2016; 44:993-1002. [PMID: 27038246 PMCID: PMC5028227 DOI: 10.1002/jmri.25239] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 02/28/2016] [Accepted: 02/29/2016] [Indexed: 01/19/2023] Open
Abstract
PURPOSE To describe and assess an automated normalization method for identifying sentinel (septal) regions of myocardial dysfunction in nonischemic, nonvalvular dilated cardiomyopathy (DCM), using an unprecedented combination of the navigator-gated 3D spiral displacement encoding with stimulated echoes (DENSE) magnetic resonance imaging (MRI), radial point interpolation (RPIM) and multiparametric strain z-score (MPZS). MATERIALS AND METHODS Navigator-gated 3D spiral DENSE, in a 1.5T MRI machine, was used for acquiring the displacement encoded complex images, MR Analytical Software System (MASS) for automated boundary detection and automated meshfree RPIM for left-ventricular (LV) myocardial strain computation to analyze MPZS in 36 subjects (with n = 17 DCM patients). Pearson's r correlation established relations between global/sentinel MPZS and ejection fraction (EF). The time taken for combined RPIM-MPZS computations was recorded. RESULTS Maximum MPZS differences were seen between anteroseptal and posterolateral regions in the base (2.0 ± 0.3 vs. 0.9 ± 0.5) and the mid-wall (2.1 ± 0.4 vs. 1.0 ± 0.4). These regional differences were found to be consistent with historically documented septal injury in nonischemic DCM. Correlations were 0.6 between global MPZS and EF, and 0.7 between sentinel MPZS and EF. The time taken for combined RPIM-MPZS computations per subject was 18.9 ± 5.9 seconds. CONCLUSION Heterogeneous contractility found in the sentinel regions with the current automated MPZS computation scheme and the correlation found between MPZS and EF may lead to the creation of a new clinical metric in LV DCM surveillance. J. MAGN. RESON. IMAGING 2016;44:993-1002.
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MESH Headings
- Aged
- Algorithms
- Cardiomyopathy, Dilated/complications
- Cardiomyopathy, Dilated/diagnostic imaging
- Cardiomyopathy, Dilated/physiopathology
- Computer Simulation
- Elastic Modulus
- Elasticity Imaging Techniques/methods
- Female
- Humans
- Image Enhancement/methods
- Image Interpretation, Computer-Assisted/methods
- Imaging, Three-Dimensional/methods
- Magnetic Resonance Imaging/methods
- Male
- Middle Aged
- Models, Cardiovascular
- Pattern Recognition, Automated/methods
- Pilot Projects
- Reproducibility of Results
- Sensitivity and Specificity
- Signal Processing, Computer-Assisted
- Stress, Mechanical
- Stroke Volume
- Tensile Strength
- Ventricular Dysfunction, Left/diagnostic imaging
- Ventricular Dysfunction, Left/etiology
- Ventricular Dysfunction, Left/physiopathology
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Affiliation(s)
- Julia Kar
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA.
| | - Brian Cupps
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA
| | - Xiaodong Zhong
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA
| | - Danielle Koerner
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA
| | - Kevin Kulshrestha
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA
| | - Samuel Neudecker
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA
| | - Jennifer Bell
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA
| | - Heidi Craddock
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA
| | - Michael Pasque
- Department of Surgery, School of Medicine, Washington University, St. Louis, Missouri, USA
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16
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Abstract
INTRODUCTION/BACKGROUND Heart failure is a major cause of cardiovascular morbidity and mortality. This review covers current heart failure treatment guidelines, emerging therapies that are undergoing clinical trial, and potential new therapeutic targets arising from basic science advances. SOURCES OF DATA A non-systematic search of MEDLINE was carried out. International guidelines and relevant reviews were searched for additional articles. AREAS OF AGREEMENT Angiotensin-converting enzyme inhibitors and beta-blockers are first line treatments for chronic heart failure with reduced left ventricular function. AREAS OF CONTROVERSY Treatment strategies to improve mortality in heart failure with preserved left ventricular function are unclear. GROWING POINTS Many novel therapies are being tested for clinical efficacy in heart failure, including those that target natriuretic peptides and myosin activators. A large number of completely novel targets are also emerging from laboratory-based research. Better understanding of pathophysiological mechanisms driving heart failure in different settings (e.g. hypertension, post-myocardial infarction, metabolic dysfunction) may allow for targeted therapies. AREAS TIMELY FOR DEVELOPING RESEARCH Therapeutic targets directed towards modifying the extracellular environment, angiogenesis, cell viability, contractile function and microRNA-based therapies.
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Affiliation(s)
- Adam Nabeebaccus
- Cardiovascular Division, King's College London British Heart Foundation Centre of Research Excellence, London, UK
| | - Sean Zheng
- Cardiovascular Division, King's College London British Heart Foundation Centre of Research Excellence, London, UK
| | - Ajay M Shah
- Cardiovascular Division, King's College London British Heart Foundation Centre of Research Excellence, London, UK
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17
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Choi S, Kim JA, Kim TH, Li H, Shin K, Lee Y, Oh S, Pewzner‐Jung Y, Futerman AH, Suh SH. Altering sphingolipid composition with aging induces contractile dysfunction of gastric smooth muscle via K(Ca) 1.1 upregulation. Aging Cell 2015; 14:982-94. [PMID: 26288989 PMCID: PMC4693452 DOI: 10.1111/acel.12388] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/19/2015] [Indexed: 01/16/2023] Open
Abstract
KCa1.1 regulates smooth muscle contractility by modulating membrane potential, and age‐associated changes in KCa1.1 expression may contribute to the development of motility disorders of the gastrointestinal tract. Sphingolipids (SLs) are important structural components of cellular membranes whose altered composition may affect KCa1.1 expression. Thus, in this study, we examined whether altered SL composition due to aging may affect the contractility of gastric smooth muscle (GSM). We studied changes in ceramide synthases (CerS) and SL levels in the GSM of mice of varying ages and compared them with those in young CerS2‐null mice. The levels of C16‐ and C18‐ceramides, sphinganine, sphingosine, and sphingosine 1‐phosphate were increased, and levels of C22, C24:1 and C24 ceramides were decreased in the GSM of both aged wild‐type and young CerS2‐null mice. The altered SL composition upregulated KCa1.1 and increased KCa1.1 currents, while no change was observed in KCa1.1 channel activity. The upregulation of KCa1.1 impaired intracellular Ca2+ mobilization and decreased phosphorylated myosin light chain levels, causing GSM contractile dysfunction. Additionally, phosphoinositide 3‐kinase, protein kinase Cζ, c‐Jun N‐terminal kinases, and nuclear factor kappa‐B were found to be involved in KCa1.1 upregulation. Our findings suggest that age‐associated changes in SL composition or CerS2 ablation upregulate KCa1.1 via the phosphoinositide 3‐kinase/protein kinase Cζ/c‐Jun N‐terminal kinases/nuclear factor kappa‐B‐mediated pathway and impair Ca2+ mobilization, which thereby induces the contractile dysfunction of GSM. CerS2‐null mice exhibited similar effects to aged wild‐type mice; therefore, CerS2‐null mouse models may be utilized for investigating the pathogenesis of aging‐associated motility disorders.
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Affiliation(s)
- Shinkyu Choi
- Department of Physiology Medical School Ewha Womans University Seoul Korea
| | - Ji Aee Kim
- Department of Physiology Medical School Ewha Womans University Seoul Korea
| | - Tae Hun Kim
- Department of Internal Medicine Medical School Ewha Womans University Seoul Korea
| | - Hai‐yan Li
- Department of Physiology Medical School Ewha Womans University Seoul Korea
| | - Kyong‐Oh Shin
- College of Pharmacy and MRC Chungbuk National University Chongju Korea
| | - Yong‐Moon Lee
- College of Pharmacy and MRC Chungbuk National University Chongju Korea
| | - Seikwan Oh
- Department of Molecular Medicine Medical School Ewha Womans University Seoul Korea
| | - Yael Pewzner‐Jung
- Department of Biological Chemistry Weizmann Institute of Science Rehovot Israel
| | - Anthony H. Futerman
- Department of Biological Chemistry Weizmann Institute of Science Rehovot Israel
| | - Suk Hyo Suh
- Department of Physiology Medical School Ewha Womans University Seoul Korea
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18
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Jin H, Yun H, Ma JY, Chen ZW, Chang SF, Ge MY, Zeng MS. Assessment of the acute effects of glucocorticoid treatment on coronary microembolization using cine, first-pass perfusion, and delayed enhancement MRI. J Magn Reson Imaging 2015; 43:921-8. [PMID: 26361889 DOI: 10.1002/jmri.25049] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 09/01/2015] [Indexed: 11/07/2022] Open
Abstract
PURPOSE To assess the acute effects of methylprednisone treatment (MPT) on coronary microembolization (CME) by cardiac cine, first-pass perfusion, and delayed gadolinium enhancement magnetic resonance imaging (DE-MRI) in an experimental swine model. MATERIALS AND METHODS Microembolization was established by intracoronary infusion of microspheres into the left anterior artery. Swine received placebo (n = 12) or methylprednisolone (n = 10, 30 mg/kg) intravenously 30 minutes before microembolization. Perfusion and DE-MRI was performed 6 hours after microembolization. Cine MR images of pre-/post-CME were obtained using 1.5T scanner. RESULTS Cine MRI demonstrated relative amelioration of the post-CME myocardial contractile dysfunction in the glucocorticoid-treated group compared to the placebo group (P < 0.001). Post-CME target myocardial perfusion parameters decreased in both groups after microembolization. The extent of these decreases were the same for the embolized-to-control area ratio of maximum upslope (P = 0.245; 95% confidence interval of the difference [CID], -0.041/0.148) and time to peak ratio (P = 0.122; 95% CID, -0.201/0.026); however, the maximum signal intensity was higher in the glucocorticoid-treated group (P = 0.012; 95% CID, 0.023/0.156). DE-MRI revealed patchy hyperenhancement in all placebo pigs (n = 12/12) after microembolization, but no hyperenhanced regions in the glucocorticoid-pretreated pigs (n = 0/10). CONCLUSION Standard, readily available, cardiac MRI techniques are useful in demonstrating post-CME myocardial dysfunction and the acute effects of glucocorticoid treatment on CME. Glucocorticoid pretreatment improves myocardial contractile dysfunction, prevents hyperenhancement, and partially ameliorates the decline of myocardial perfusion in the embolized area.
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Affiliation(s)
- Hang Jin
- Department of Radiology, Zhongshan Hospital, Fudan University and Shanghai Institute of Medical Imaging, Shanghai, China.,Department of Medical Imaging, Shanghai Medical College, Fudan University, Shanghai, China
| | - Hong Yun
- Department of Radiology, Zhongshan Hospital, Fudan University and Shanghai Institute of Medical Imaging, Shanghai, China.,Department of Medical Imaging, Shanghai Medical College, Fudan University, Shanghai, China
| | - Jian-ying Ma
- Department of Cardiology, Zhongshan Hospital, Fudan University and Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Zhang-wei Chen
- Department of Cardiology, Zhongshan Hospital, Fudan University and Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Shu-fu Chang
- Department of Cardiology, Zhongshan Hospital, Fudan University and Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Mei-ying Ge
- Department of Radiology, the 5th people's Hospital of Shanghai, Fudan University, Shanghai, China
| | - Meng-su Zeng
- Department of Radiology, Zhongshan Hospital, Fudan University and Shanghai Institute of Medical Imaging, Shanghai, China.,Department of Medical Imaging, Shanghai Medical College, Fudan University, Shanghai, China
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Levine S, Budak MT, Dierov J, Singhal S. Inactivity-induced diaphragm dysfunction and mitochondria-targeted antioxidants: new concepts in critical care medicine. Crit Care Med 2011; 39:1844-5. [PMID: 21685759 PMCID: PMC10998542 DOI: 10.1097/ccm.0b013e31821e85ca] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Li Y, Garson CD, Xu Y, French BA, Hossack JA. High frequency ultrasound imaging detects cardiac dyssynchrony in noninfarcted regions of the murine left ventricle late after reperfused myocardial infarction. Ultrasound Med Biol 2008; 34:1063-75. [PMID: 18313202 PMCID: PMC2587444 DOI: 10.1016/j.ultrasmedbio.2007.12.009] [Citation(s) in RCA: 11] [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] [Subscribe] [Scholar Register] [Received: 06/06/2007] [Revised: 11/22/2007] [Accepted: 12/13/2007] [Indexed: 05/22/2023]
Abstract
Cardiac dyssynchrony in the left ventricles of murine hearts late (> or =28 d) after reperfused myocardial infarction (post-MI) was assessed using high frequency 30 MHz B-mode ultrasound imaging. Nine post-MI and six normal C57Bl/6 mice were studied in both short- and long-axis views. Regional time to peak displacement (T(peak_d)) and time to peak strain (T(peak_s)) were calculated in 36 sectors along the myocardial circumference; then their standard deviations (SD_T(peak_d) and SD_T(peak_s)) were computed among noninfarcted myocardial regions for each mouse and were compared between the normal and post-MI mouse groups with Student's t-test. The comparison revealed that SD_T(peak_d) and SD_T(peak_s) were significantly larger in the post-MI hearts than in the normal hearts. The displacement uniformity ratio was determined to be 0.97 +/- 0.01 and 0.85 +/- 0.07 for radial and circumferential displacements in the normal hearts, respectively; and 0.59 +/- 0.17 and 0.64 +/- 0.24 in the post-MI hearts. In conclusion, this high resolution ultrasound image tracking method provides for the detection of cardiac dyssynchrony in the noninfarcted regions in the murine left ventricles late after MI by identifying the temporal and spatial disparity of regional myocardial contraction.
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Affiliation(s)
- Yinbo Li
- Department of Biomedical Engineering, University of Virginia (Charlottesville, VA, USA)
| | - Christopher D. Garson
- Department of Biomedical Engineering, University of Virginia (Charlottesville, VA, USA)
| | - Yaqin Xu
- Department of Biomedical Engineering, University of Virginia (Charlottesville, VA, USA)
| | - Brent A. French
- Department of Biomedical Engineering, University of Virginia (Charlottesville, VA, USA)
- Department of Medicine, University of Virginia (Charlottesville, VA, USA)
- Department of Radiology, University of Virginia (Charlottesville, VA, USA)
| | - John A. Hossack
- Department of Biomedical Engineering, University of Virginia (Charlottesville, VA, USA)
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Ouwens DM, Diamant M, Fodor M, Habets DDJ, Pelsers MMAL, El Hasnaoui M, Dang ZC, van den Brom CE, Vlasblom R, Rietdijk A, Boer C, Coort SLM, Glatz JFC, Luiken JJFP. Cardiac contractile dysfunction in insulin-resistant rats fed a high-fat diet is associated with elevated CD36-mediated fatty acid uptake and esterification. Diabetologia 2007; 50:1938-1948. [PMID: 17639306 PMCID: PMC2039861 DOI: 10.1007/s00125-007-0735-8] [Citation(s) in RCA: 167] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2007] [Accepted: 05/22/2007] [Indexed: 11/29/2022]
Abstract
AIMS/HYPOTHESIS Changes in cardiac substrate utilisation leading to altered energy metabolism may underlie the development of diabetic cardiomyopathy. We studied cardiomyocyte substrate uptake and utilisation and the role of the fatty acid translocase CD36 in relation to in vivo cardiac function in rats fed a high-fat diet (HFD). METHODS Rats were exposed to an HFD or a low-fat diet (LFD). In vivo cardiac function was monitored by echocardiography. Substrate uptake and utilisation were determined in isolated cardiomyocytes. RESULTS Feeding an HFD for 8 weeks induced left ventricular dilation in the systolic phase and decreased fractional shortening and the ejection fraction. Insulin-stimulated glucose uptake and proline-rich Akt substrate 40 phosphorylation were 41% (p < 0.001) and 45% (p < 0.05) lower, respectively, in cardiomyocytes from rats on the HFD. However, long-chain fatty acid (LCFA) uptake was 1.4-fold increased (p < 0.001) and LCFA esterification into triacylglycerols and phospholipids was increased 1.4- and 1.5-fold, respectively (both p < 0.05), in cardiomyocytes from HFD compared with LFD hearts. In the presence of the CD36 inhibitor sulfo-N-succinimidyloleate, LCFA uptake and esterification were similar in LFD and HFD cardiomyocytes. In HFD hearts CD36 was relocated to the sarcolemma, and basal phosphorylation of a mediator of CD36-trafficking, i.e. protein kinase B (PKB/Akt), was increased. CONCLUSIONS/INTERPRETATION Feeding rats an HFD induced cardiac contractile dysfunction, which was accompanied by the relocation of CD36 to the sarcolemma, and elevated basal levels of phosphorylated PKB/Akt. The permanent presence of CD36 at the sarcolemma resulted in enhanced rates of LCFA uptake and myocardial triacylglycerol accumulation, and may contribute to the development of insulin resistance and diabetic cardiomyopathy.
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Affiliation(s)
- D M Ouwens
- Department of Molecular Cell Biology, Section of Signal Transduction and Ageing, Leiden University Medical Centre, Postzone S1-P, P.O. Box 9600, NL-2300, RC Leiden, The Netherlands.
| | - M Diamant
- Department of Endocrinology, Diabetes Centre, VU University Medical Centre, Amsterdam, the Netherlands
| | - M Fodor
- Department of Anatomy and Embryology/Central Animal Facility, Leiden University Medical Centre, Leiden, the Netherlands
| | - D D J Habets
- Department of Molecular Genetics, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
| | - M M A L Pelsers
- Department of Molecular Genetics, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
| | - M El Hasnaoui
- Department of Molecular Genetics, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
| | - Z C Dang
- Department of Endocrinology, Diabetes Centre, VU University Medical Centre, Amsterdam, the Netherlands
- Laboratory for Physiology, VU University Medical Centre, Amsterdam, the Netherlands
| | - C E van den Brom
- Department of Molecular Cell Biology, Section of Signal Transduction and Ageing, Leiden University Medical Centre, Postzone S1-P, P.O. Box 9600, NL-2300, RC Leiden, The Netherlands
- Department of Endocrinology, Diabetes Centre, VU University Medical Centre, Amsterdam, the Netherlands
- Laboratory for Physiology, VU University Medical Centre, Amsterdam, the Netherlands
| | - R Vlasblom
- Department of Molecular Cell Biology, Section of Signal Transduction and Ageing, Leiden University Medical Centre, Postzone S1-P, P.O. Box 9600, NL-2300, RC Leiden, The Netherlands
- Department of Endocrinology, Diabetes Centre, VU University Medical Centre, Amsterdam, the Netherlands
- Laboratory for Physiology, VU University Medical Centre, Amsterdam, the Netherlands
| | - A Rietdijk
- Department of Molecular Cell Biology, Section of Signal Transduction and Ageing, Leiden University Medical Centre, Postzone S1-P, P.O. Box 9600, NL-2300, RC Leiden, The Netherlands
| | - C Boer
- Laboratory for Physiology, VU University Medical Centre, Amsterdam, the Netherlands
| | - S L M Coort
- Department of Molecular Genetics, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
| | - J F C Glatz
- Department of Molecular Genetics, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
| | - J J F P Luiken
- Department of Molecular Genetics, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
- Department of Biochemical Physiology and Institute of Biomembranes, Utrecht University, Utrecht, the Netherlands
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