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Burnham HV, Cizauskas HE, Barefield DY. Fine tuning contractility: atrial sarcomere function in health and disease. Am J Physiol Heart Circ Physiol 2024; 326:H568-H583. [PMID: 38156887 PMCID: PMC11221815 DOI: 10.1152/ajpheart.00252.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 12/20/2023] [Accepted: 12/21/2023] [Indexed: 01/03/2024]
Abstract
The molecular mechanisms of sarcomere proteins underlie the contractile function of the heart. Although our understanding of the sarcomere has grown tremendously, the focus has been on ventricular sarcomere isoforms due to the critical role of the ventricle in health and disease. However, atrial-specific or -enriched myofilament protein isoforms, as well as isoforms that become expressed in disease, provide insight into ways this complex molecular machine is fine-tuned. Here, we explore how atrial-enriched sarcomere protein composition modulates contractile function to fulfill the physiological requirements of atrial function. We review how atrial dysfunction negatively affects the ventricle and the many cardiovascular diseases that have atrial dysfunction as a comorbidity. We also cover the pathophysiology of mutations in atrial-enriched contractile proteins and how they can cause primary atrial myopathies. Finally, we explore what is known about contractile function in various forms of atrial fibrillation. The differences in atrial function in health and disease underscore the importance of better studying atrial contractility, especially as therapeutics currently in development to modulate cardiac contractility may have different effects on atrial sarcomere function.
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Affiliation(s)
- Hope V Burnham
- Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, Illinois, United States
| | - Hannah E Cizauskas
- Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, Illinois, United States
| | - David Y Barefield
- Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, Illinois, United States
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Regulation of Prepro-NeuropeptideW/B and Its Receptor in the Heart of ZDF Rats: An Animal Model of Type II DM. Int J Mol Sci 2022; 23:ijms232315219. [PMID: 36499546 PMCID: PMC9739957 DOI: 10.3390/ijms232315219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 11/28/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022] Open
Abstract
Neuropeptide B (NPB) and neuropeptide W (NPW) are neuropeptides, which constitute NPB/W signaling systems together with G-protein coupled receptors NPBWR1. The location and function of NPB/W signaling systems have been predominantly detected and mapped within the CNS, including their role in the modulation of inflammatory pain, neuroendocrine functions, and autonomic nervous systems. The aim of the study is to investigate the impact of diabetes on the neuropeptide B/W signaling system in different heart compartments and neurons which innervates it. In the RT-qPCR analysis, we observed the upregulation of mRNA for preproNPB in RV, for preproNPW in LA, and for NPBWR1 in DRG in diabetic rats. On the contrary, the expression of mRNA for NPBWR1 was downregulated in LV in diabetic rats. In the WB analysis, significant downregulation of NPBWR1 in LV (0.54-fold, p = 0.046) in diabetic rats was observed at the proteomic level. The presence of NPBWR1 was also confirmed in a dissected LCM section of cardiomyocytes and coronary arteries. The positive inotropic effect of NPW described on the diabetic cardiomyocytes in vitro could point to a possible therapeutic target for compensation of the contractile dysfunction in the diabetic heart. In conclusion, the NPB/W signaling system is involved in the regulation of heart functions and long-term diabetes leads to changes in the expression of individual members of this signaling system differently in each cardiac compartment, which is related to the different morphology and function of these cardiac chambers.
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Gerzen OP, Votinova VO, Potoskueva IK, Nabiev SR, Nikitina LV. Characteristics of Actin—Myosin Interaction in Different Regions of Rat Heart. J EVOL BIOCHEM PHYS+ 2022. [DOI: 10.1134/s0022093022070110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Gerzen OP, Nabiev SR, Klinova SV, Minigalieva IA, Sutunkova MP, Katsnelson BA, Nikitina LV. Molecular mechanisms of mechanical function changes of the rat myocardium under subchronic lead exposure. Food Chem Toxicol 2022; 169:113444. [PMID: 36179994 DOI: 10.1016/j.fct.2022.113444] [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: 05/25/2022] [Revised: 09/10/2022] [Accepted: 09/21/2022] [Indexed: 11/26/2022]
Abstract
A moderate degree of lead intoxication was observed in male rats after repeated intraperitoneal injections with two doses of lead acetate three times a week during 5 (12.5 mg of Pb per kg body mass) and 6 (6.01 mg of Pb per kg body mass) weeks. Using an in vitro motility assay, we investigated the impact of this intoxication on the characteristics of actin-myosin interaction and its regulation in the atria, right, and left ventricles. Both lead doses exposure decreased the maximum sliding velocity of reconstituted thin filaments over myosin and fraction of motile filaments in all heart chambers, caused the myosin isoforms shift towards slower β-myosin heavy chains in ventricles and decreased regulatory light chain phosphorylation in atria. No statistically significant difference was found in force and calcium regulation of actin-myosin interaction. A dose-dependent effect of lead on myosin functional characteristics was found in all heart chambers, but the degree of this effect varied depending on the heart chamber.
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Affiliation(s)
- Oksana P Gerzen
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia.
| | - Salavat R Nabiev
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia
| | - Svetlana V Klinova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, Ekaterinburg, Russia
| | - Ilzira A Minigalieva
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, Ekaterinburg, Russia
| | - Marina P Sutunkova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, Ekaterinburg, Russia
| | - Boris A Katsnelson
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, Ekaterinburg, Russia
| | - Larisa V Nikitina
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia
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Features of the Metabolisms of Cardiac Troponin Molecules—Part 1: The Main Stages of Metabolism, Release Stage. Curr Issues Mol Biol 2022; 44:1376-1394. [PMID: 35723315 PMCID: PMC8947512 DOI: 10.3390/cimb44030092] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/08/2022] [Accepted: 03/09/2022] [Indexed: 11/17/2022] Open
Abstract
Cardiac troponins (cTns) have long been the most valuable and specific biomarkers for detecting ischemic myocardial cells (MCs) injury, which is one of the key signs of myocardial infarction (MI). Modern methods (highly sensitive and ultra-sensitive immunoassays (hs-cTns)) of detection are an important and indispensable tool for the early diagnosis of MI and the choice of patient management protocols. Timely diagnosis of MI can significantly improve the prognosis of patients. However, in real clinical practice, doctors often face a significant problem when using cTns—the difficulty of differential diagnosis due to frequent and unexplained increases in the concentration of cTns in blood serum. In addition, there is conflicting information that may potentially affect the diagnostic capabilities and value of cTns: the influence of certain biological factors (diurnal rhythm, gender and age) on serum cTns levels; extra-cardiac expression of cTns; the possibilities of non-invasive diagnosis of MI; and other pathological conditions that cause non-ischemic injury to MCs. To solve these problems, it is necessary to concentrate on studying the metabolism of cTns. The review of our current knowledge about cTns metabolism consists of two parts. In this (first) part of the manuscript, the main stages of cTns metabolism are briefly described and the mechanisms of cTns release from MCs are considered in detail.
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Khokhlova A, Myachina T, Volzhaninov D, Butova X, Kochurova A, Berg V, Gette I, Moroz G, Klinova S, Minigalieva I, Solovyova O, Danilova I, Sokolova K, Kopylova G, Shchepkin D. Type 1 Diabetes Impairs Cardiomyocyte Contractility in the Left and Right Ventricular Free Walls but Preserves It in the Interventricular Septum. Int J Mol Sci 2022; 23:ijms23031719. [PMID: 35163643 PMCID: PMC8836009 DOI: 10.3390/ijms23031719] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/28/2022] [Accepted: 01/28/2022] [Indexed: 12/14/2022] Open
Abstract
Type 1 diabetes (T1D) leads to ischemic heart disease and diabetic cardiomyopathy. We tested the hypothesis that T1D differently affects the contractile function of the left and right ventricular free walls (LV, RV) and the interventricular septum (IS) using a rat model of alloxan-induced T1D. Single-myocyte mechanics and cytosolic Ca2+ concentration transients were studied on cardiomyocytes (CM) from LV, RV, and IS in the absence and presence of mechanical load. In addition, we analyzed the phosphorylation level of sarcomeric proteins and the characteristics of the actin-myosin interaction. T1D similarly affected the characteristics of actin-myosin interaction in all studied regions, decreasing the sliding velocity of native thin filaments over myosin in an in vitro motility assay and its Ca2+ sensitivity. A decrease in the thin-filament velocity was associated with increased expression of β-myosin heavy-chain isoform. However, changes in the mechanical function of single ventricular CM induced by T1D were different. T1D depressed the contractility of CM from LV and RV; it decreased the auxotonic tension amplitude and the slope of the active tension–length relationship. Nevertheless, the contractile function of CM from IS was principally preserved.
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Affiliation(s)
- Anastasia Khokhlova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
- Institute of Physics and Technology, Ural Federal University, Mira 19, 620002 Yekaterinburg, Russia
- Correspondence:
| | - Tatiana Myachina
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Denis Volzhaninov
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Xenia Butova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Anastasia Kochurova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Valentina Berg
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Irina Gette
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Gleb Moroz
- Institute of Natural Sciences and Mathematics, Ural Federal University, Mira 19, 620002 Yekaterinburg, Russia;
| | - Svetlana Klinova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, Popova 30, 620014 Yekaterinburg, Russia; (S.K.); (I.M.)
| | - Ilzira Minigalieva
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, Popova 30, 620014 Yekaterinburg, Russia; (S.K.); (I.M.)
| | - Olga Solovyova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
- Institute of Physics and Technology, Ural Federal University, Mira 19, 620002 Yekaterinburg, Russia
- Institute of Natural Sciences and Mathematics, Ural Federal University, Mira 19, 620002 Yekaterinburg, Russia;
| | - Irina Danilova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Ksenia Sokolova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Galina Kopylova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
| | - Daniil Shchepkin
- Institute of Immunology and Physiology, Russian Academy of Sciences, Pervomajskaya 106, 620049 Yekaterinburg, Russia; (T.M.); (D.V.); (X.B.); (A.K.); (V.B.); (I.G.); (O.S.); (I.D.); (K.S.); (G.K.); (D.S.)
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Exploring Functional Differences between the Right and Left Ventricles to Better Understand Right Ventricular Dysfunction. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:9993060. [PMID: 34497685 PMCID: PMC8421158 DOI: 10.1155/2021/9993060] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 08/04/2021] [Indexed: 12/16/2022]
Abstract
The right and left ventricles have traditionally been studied as individual entities. Furthermore, modifications found in diseased left ventricles are assumed to influence on right ventricle alterations, but the connection is poorly understood. In this review, we describe the differences between ventricles under physiological and pathological conditions. Understanding the mechanisms that differentiate both ventricles would facilitate a more effective use of therapeutics and broaden our knowledge of right ventricle (RV) dysfunction. RV failure is the strongest predictor of mortality in pulmonary arterial hypertension, but at present, there are no definitive therapies directly targeting RV failure. We further explore the current state of drugs and molecules that improve RV failure in experimental therapeutics and clinical trials to treat pulmonary arterial hypertension and provide evidence of their potential benefits in heart failure.
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Kovács Á, Herwig M, Budde H, Delalat S, Kolijn D, Bódi B, Hassoun R, Tangos M, Zhazykbayeva S, Balogh Á, Czuriga D, Van Linthout S, Tschöpe C, Dhalla NS, Mügge A, Tóth A, Papp Z, Barta J, Hamdani N. Interventricular Differences of Signaling Pathways-Mediated Regulation of Cardiomyocyte Function in Response to High Oxidative Stress in the Post-Ischemic Failing Rat Heart. Antioxidants (Basel) 2021; 10:antiox10060964. [PMID: 34208541 PMCID: PMC8234177 DOI: 10.3390/antiox10060964] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/20/2021] [Accepted: 06/08/2021] [Indexed: 01/09/2023] Open
Abstract
Standard heart failure (HF) therapies have failed to improve cardiac function or survival in HF patients with right ventricular (RV) dysfunction suggesting a divergence in the molecular mechanisms of RV vs. left ventricular (LV) failure. Here we aimed to investigate interventricular differences in sarcomeric regulation and function in experimental myocardial infarction (MI)-induced HF with reduced LV ejection fraction (HFrEF). MI was induced by LAD ligation in Sprague-Dawley male rats. Sham-operated animals served as controls. Eight weeks after intervention, post-ischemic HFrEF and Sham animals were euthanized. Heart tissue samples were deep-frozen stored (n = 3-5 heart/group) for ELISA, kinase activity assays, passive stiffness and Ca2+-sensitivity measurements on isolated cardiomyocytes, phospho-specific Western blot, and PAGE of contractile proteins, as well as for collagen gene expressions. Markers of oxidative stress and inflammation showed interventricular differences in post-ischemic rats: TGF-β1, lipid peroxidation, and 3-nitrotyrosine levels were higher in the LV than RV, while hydrogen peroxide, VCAM-1, TNFα, and TGF-β1 were increased in both ventricles. In addition, nitric oxide (NO) level was significantly decreased, while FN-1 level was significantly increased only in the LV, but both were unchanged in RV. CaMKII activity showed an 81.6% increase in the LV, in contrast to a 38.6% decrease in the RV of HFrEF rats. Cardiomyocyte passive stiffness was higher in the HFrEF compared to the Sham group as evident from significantly steeper Fpassive vs. sarcomere length relationships. In vitro treatment with CaMKIIδ, however, restored cardiomyocyte passive stiffness only in the HFrEF RV, but had no effect in the HFrEF LV. PKG activity was lower in both ventricles in the HFrEF compared to the Sham group. In vitro PKG administration decreased HFrEF cardiomyocyte passive stiffness; however, the effect was more pronounced in the HFrEF LV than HFrEF RV. In line with this, we observed distinct changes of titin site-specific phosphorylation in the RV vs. LV of post-ischemic rats, which may explain divergent cardiomyocyte stiffness modulation observed. Finally, Ca2+-sensitivity of RV cardiomyocytes was unchanged, while LV cardiomyocytes showed increased Ca2+-sensitivity in the HFrEF group. This could be explained by decreased Ser-282 phosphorylation of cMyBP-C by 44.5% in the RV, but without any alteration in the LV, while Ser-23/24 phosphorylation of cTnI was decreased in both ventricles in the HFrEF vs. the Sham group. Our data pointed to distinct signaling pathways-mediated phosphorylations of sarcomeric proteins for the RV and LV of the post-ischemic failing rat heart. These results implicate divergent responses for oxidative stress and open a new avenue in targeting the RV independently of the LV.
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Affiliation(s)
- Árpád Kovács
- Division of Clinical Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (Á.K.); (B.B.); (A.T.); (Z.P.)
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Melissa Herwig
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Heidi Budde
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Simin Delalat
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Detmar Kolijn
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Beáta Bódi
- Division of Clinical Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (Á.K.); (B.B.); (A.T.); (Z.P.)
| | - Roua Hassoun
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Melina Tangos
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Saltanat Zhazykbayeva
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Ágnes Balogh
- Department of Cardiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (Á.B.); (D.C.); (J.B.)
| | - Dániel Czuriga
- Department of Cardiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (Á.B.); (D.C.); (J.B.)
| | - Sophie Van Linthout
- Berlin Institute of Health at Charite (BIH)-Universitätmedizin Berlin, BIH Center for Regenerative Therapies (BCRT), 13353 Berlin, Germany; (S.V.L.); (C.T.)
| | - Carsten Tschöpe
- Berlin Institute of Health at Charite (BIH)-Universitätmedizin Berlin, BIH Center for Regenerative Therapies (BCRT), 13353 Berlin, Germany; (S.V.L.); (C.T.)
| | - Naranjan S. Dhalla
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Avenue, Department of Physiology and Pathophysiology, College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R2H 2A6, Canada;
| | - Andreas Mügge
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
| | - Attila Tóth
- Division of Clinical Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (Á.K.); (B.B.); (A.T.); (Z.P.)
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, H-4032 Debrecen, Hungary
| | - Zoltán Papp
- Division of Clinical Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (Á.K.); (B.B.); (A.T.); (Z.P.)
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, H-4032 Debrecen, Hungary
| | - Judit Barta
- Department of Cardiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (Á.B.); (D.C.); (J.B.)
| | - Nazha Hamdani
- Institut für Forschung und Lehre (IFL) Molecular and Experimental Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany; (M.H.); (H.B.); (S.D.); (D.K.); (R.H.); (M.T.); (S.Z.); (A.M.)
- Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, 44801 Bochum, Germany
- Correspondence: ; Tel.: +49-234-5095-9053
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Nollet EE, Manders EM, Goebel M, Jansen V, Brockmann C, Osinga J, van der Velden J, Helmes M, Kuster DWD. Large-Scale Contractility Measurements Reveal Large Atrioventricular and Subtle Interventricular Differences in Cultured Unloaded Rat Cardiomyocytes. Front Physiol 2020; 11:815. [PMID: 32848817 PMCID: PMC7396550 DOI: 10.3389/fphys.2020.00815] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 06/18/2020] [Indexed: 01/22/2023] Open
Abstract
The chambers of the heart fulfill different hemodynamic functions, which are reflected in their structural and contractile properties. While the atria are highly elastic to allow filling from the venous system, the ventricles need to be able to produce sufficiently high pressures to eject blood into the circulation. The right ventricle (RV) pumps into the low pressure pulmonary circulation, while the left ventricle (LV) needs to overcome the high pressure of the systemic circulation. It is incompletely understood whether these differences can be explained by the contractile differences at the level of the individual cardiomyocytes of the chambers. We addressed this by isolating cardiomyocytes from atria, RV, LV, and interventricular septum (IVS) of five healthy wild-type rats. Using a high-throughput contractility set-up, we measured contractile function of 2,043 cells after overnight culture. Compared to ventricular cardiomyocytes, atrial cells showed a twofold lower contraction amplitude and 1.4- to 1.7-fold slower kinetics of contraction and relaxation. The interventricular differences in contractile function were much smaller; RV cells displayed 12–13% less fractional shortening and 5–9% slower contraction and 3–15% slower relaxation kinetics relative to their LV and IVS counterparts. Aided by a large dataset, we established relationships between contractile parameters and found contraction velocity, fractional shortening and relaxation velocity to be highly correlated. In conclusion, our findings are in line with contractile differences observed at the atrioventricular level, but can only partly explain the interventricular differences that exist at the organ level.
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Affiliation(s)
- Edgar E Nollet
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | | | - Max Goebel
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | - Valentijn Jansen
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | - Cord Brockmann
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | - Jorrit Osinga
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | - Jolanda van der Velden
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
| | - Michiel Helmes
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands.,CytoCypher BV, Wageningen, Netherlands
| | - Diederik W D Kuster
- Department of Physiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, Netherlands
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10
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Blair CA, Brundage EA, Thompson KL, Stromberg A, Guglin M, Biesiadecki BJ, Campbell KS. Heart Failure in Humans Reduces Contractile Force in Myocardium From Both Ventricles. JACC Basic Transl Sci 2020; 5:786-798. [PMID: 32875169 PMCID: PMC7452203 DOI: 10.1016/j.jacbts.2020.05.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 05/18/2020] [Accepted: 05/18/2020] [Indexed: 01/01/2023]
Abstract
Contractile assays were performed using multicellular preparations isolated from the left and right ventricles of organ donors and patients with heart failure. Heart failure reduced maximum force and power by approximately 30% in the myocardium from both ventricles. Heart failure increased the Ca2+ sensitivity of contraction, but the effect was bigger in right ventricular tissue than in left ventricular samples. The changes in Ca2+ sensitivity may reflect ventricle-specific post-translational modifications to sarcomeric proteins.
This study measured how heart failure affects the contractile properties of the human myocardium from the left and right ventricles. The data showed that maximum force and maximum power were reduced by approximately 30% in multicellular preparations from both ventricles, possibly because of ventricular remodeling (e.g., cellular disarray and/or excess fibrosis). Heart failure increased the calcium (Ca2+) sensitivity of contraction in both ventricles, but the effect was bigger in right ventricular samples. The changes in Ca2+ sensitivity were associated with ventricle-specific changes in the phosphorylation of troponin I, which indicated that adrenergic stimulation might induce different effects in the left and right ventricles.
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Key Words
- Ca2+ sensitivity
- Ca2+, calcium
- Fact, maximum Ca2+-activated force
- Fpas, passive force
- LV, left ventricle
- MyBP-C, myosin binding protein-C
- PKA, protein kinase A
- Pmax, maximum power output
- RLC, regulatory light chain
- RV, right ventricle
- TnI, troponin I
- Vmax, maximum shortening velocity
- heart failure
- human myocardium
- ktr, rate of force recovery
- myofilament proteins
- nH, Hill coefficient
- ventricular function
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Affiliation(s)
- Cheavar A Blair
- Department of Physiology, University of Kentucky, Lexington, Kentucky
| | - Elizabeth A Brundage
- Department of Physiology and Cell Biology and The Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio
| | | | - Arnold Stromberg
- Department of Statistics, University of Kentucky, Lexington, Kentucky
| | - Maya Guglin
- Division of Cardiovascular Medicine, University of Kentucky, Lexington, Kentucky
| | - Brandon J Biesiadecki
- Department of Physiology and Cell Biology and The Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio
| | - Kenneth S Campbell
- Department of Physiology, University of Kentucky, Lexington, Kentucky.,Division of Cardiovascular Medicine, University of Kentucky, Lexington, Kentucky
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11
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Ruppert M, Bódi B, Korkmaz-Icöz S, Loganathan S, Jiang W, Lehmann L, Oláh A, Barta BA, Sayour AA, Merkely B, Karck M, Papp Z, Szabó G, Radovits T. Myofilament Ca 2+ sensitivity correlates with left ventricular contractility during the progression of pressure overload-induced left ventricular myocardial hypertrophy in rats. J Mol Cell Cardiol 2019; 129:208-218. [PMID: 30844361 DOI: 10.1016/j.yjmcc.2019.02.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 01/31/2019] [Accepted: 02/28/2019] [Indexed: 10/27/2022]
Abstract
AIM Here we aimed at investigating the relation between left ventricular (LV) contractility and myofilament function during the development and progression of pressure overload (PO)-induced LV myocardial hypertrophy (LVH). METHODS Abdominal aortic banding (AB) was performed to induce PO in rats for 6, 12 and 18 weeks. Sham operated animals served as controls. Structural and molecular alterations were investigated by serial echocardiography, histology, quantitative real-time PCR and western blot. LV function was assessed by pressure-volume analysis. Force measurement was carried out in permeabilized cardiomyocytes. RESULTS AB resulted in the development of pathological LVH as indicated by increased heart weight-to-tibial length ratio, LV mass index, cardiomyocyte diameter and fetal gene expression. These alterations were already present at early stage of LVH (AB-week6). Furthermore, at more advanced stages (AB-week12, AB-week18), myocardial fibrosis and chamber dilatation were also observed. From a hemodynamic point of view, the AB-wk6 group was associated with increased LV contractility, maintained ventriculo-arterial coupling (VAC) and preserved systolic function. In the same experimental group, increased myofilament Ca2+ sensitivity (pCa50) and hyperphosphorylation of cardiac troponin-I (cTnI) at Threonine-144 was detected. In contrast, in the AB-wk12 and AB-wk18 groups, the initial augmentation of LV contractility, as well as the increased myofilament Ca2+ sensitivity and cTnI (Threonine-144) hyperphosphorylation diminished, leading to impaired VAC and reduced systolic performance. Strong correlation was found between LV contractility parameters and myofilament Ca2+-sensitivity among the study groups. CONCLUSION Changes in myofilament Ca2+ sensitivity might underlie the alterations in LV contractility during the development and progression of PO-induced LVH.
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Affiliation(s)
- Mihály Ruppert
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary; Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany.
| | - Beáta Bódi
- Division of Clinical Physiology, Department of Cardiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Sevil Korkmaz-Icöz
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | | | - Weipeng Jiang
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Lorenz Lehmann
- Department of Cardiology, Angiology and Pulmonology, University Hospital Heidelberg, Heidelberg, Germany
| | - Attila Oláh
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | | | - Alex Ali Sayour
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary; Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Matthias Karck
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Zoltán Papp
- Division of Clinical Physiology, Department of Cardiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, Debrecen, Hungary
| | - Gábor Szabó
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
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12
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Experimental assessment of a myocyte-based multiscale model of cardiac contractile dysfunction. J Theor Biol 2018; 456:16-28. [PMID: 30063925 DOI: 10.1016/j.jtbi.2018.07.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 07/09/2018] [Accepted: 07/27/2018] [Indexed: 12/22/2022]
Abstract
Cardiac contractile dysfunction (CD) is a multifactorial syndrome caused by different acute or progressive diseases which hamper assessing the role of the underlying mechanisms characterizing a defined pathological condition. Mathematical modeling can help to understand the processes involved in CD and analyze their relative impact in the overall response. The aim of this study was thus to use a myocyte-based multiscale model of the circulatory system to simulate the effects of halothane, a volatile anesthetic which at high doses elicits significant acute CD both in isolated myocytes and intact animals. Ventricular chambers built using a human myocyte model were incorporated into a whole circulatory system represented by resistances and capacitances. Halothane-induced decreased sarco(endo)plasmic reticulum Ca2+ (SERCA2a) reuptake pump, transient outward K+ (Ito), Na+-Ca2+ exchanger (INCX) and L-type Ca2+ channel (ICaL) currents, together with ryanodine receptor (RyR2) increased open probability (Po) and reduced myofilament Ca2+ sensitivity, reproduced equivalent decreased action potential duration at 90% repolarization and intracellular Ca2+ concentration at the myocyte level reported in the literature. In the whole circulatory system, model reduction in mean arterial pressure, cardiac output and regional wall thickening fraction was similar to experimental results in open-chest sheep subjected to acute halothane overdose. Effective model performance indicates that the model structure could be used to study other changes in myocyte targets eliciting CD.
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13
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Duggal D, Requena S, Nagwekar J, Raut S, Rich R, Das H, Patel V, Gryczynski I, Fudala R, Gryczynski Z, Blair C, Campbell KS, Borejdo J. No Difference in Myosin Kinetics and Spatial Distribution of the Lever Arm in the Left and Right Ventricles of Human Hearts. Front Physiol 2017; 8:732. [PMID: 29081749 PMCID: PMC5645524 DOI: 10.3389/fphys.2017.00732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 09/08/2017] [Indexed: 11/13/2022] Open
Abstract
The systemic circulation offers larger resistance to the blood flow than the pulmonary system. Consequently, the left ventricle (LV) must pump blood with more force than the right ventricle (RV). The question arises whether the stronger pumping action of the LV is due to a more efficient action of left ventricular myosin, or whether it is due to the morphological differences between ventricles. Such a question cannot be answered by studying the entire ventricles or myocytes because any observed differences would be wiped out by averaging the information obtained from trillions of myosin molecules present in a ventricle or myocyte. We therefore searched for the differences between single myosin molecules of the LV and RV of failing hearts In-situ. We show that the parameters that define the mechanical characteristics of working myosin (kinetic rates and the distribution of spatial orientation of myosin lever arm) were the same in both ventricles. These results suggest that there is no difference in the way myosin interacts with thin filaments in myocytes of failing hearts, and suggests that the difference in pumping efficiencies are caused by interactions between muscle proteins other than myosin or that they are purely morphological.
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Affiliation(s)
- Divya Duggal
- Department of Cell Biology and Center for Commercialization of Fluorescence Technologies, University of North Texas, Health Science Center, Fort Worth, TX, United States
| | - S Requena
- Department of Cell Biology and Center for Commercialization of Fluorescence Technologies, University of North Texas, Health Science Center, Fort Worth, TX, United States
| | - Janhavi Nagwekar
- Department of Cell Biology and Center for Commercialization of Fluorescence Technologies, University of North Texas, Health Science Center, Fort Worth, TX, United States
| | - Sangram Raut
- Department of Physics and Astronomy, Texas Christian University, Fort Worth, TX, United States
| | - Ryan Rich
- Department of Mathematics and Physics, Texas Wesleyan University, Fort Worth, TX, United States
| | - Hriday Das
- Center for Neuroscience Discovery, Institute for Healthy Aging, University of North Texas, Health Science Center, Fort Worth, TX, United States
| | - Vipul Patel
- Department of Cell Biology and Center for Commercialization of Fluorescence Technologies, University of North Texas, Health Science Center, Fort Worth, TX, United States.,Center of Emphasis in Diabetes and Metabolism, Paul L. Foster School of Medicine, Texas Tech University Health Sciences Center El Paso, El Paso, TX, United States
| | - Ignacy Gryczynski
- Department of Cell Biology and Center for Commercialization of Fluorescence Technologies, University of North Texas, Health Science Center, Fort Worth, TX, United States
| | - Rafal Fudala
- Department of Cell Biology and Center for Commercialization of Fluorescence Technologies, University of North Texas, Health Science Center, Fort Worth, TX, United States
| | - Zygmunt Gryczynski
- Department of Physics and Astronomy, Texas Christian University, Fort Worth, TX, United States
| | - Cheavar Blair
- Department of Physiology, University of Kentucky, Lexington, KY, United States
| | - Kenneth S Campbell
- Department of Physiology, University of Kentucky, Lexington, KY, United States
| | - Julian Borejdo
- Department of Cell Biology and Center for Commercialization of Fluorescence Technologies, University of North Texas, Health Science Center, Fort Worth, TX, United States
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14
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Bening C, Hamouda K, Schimmer C, Leyh R. Myofilament function and body mass index. Biomed Rep 2017; 6:291-294. [PMID: 28451388 PMCID: PMC5403173 DOI: 10.3892/br.2017.858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 01/25/2017] [Indexed: 11/05/2022] Open
Abstract
Body mass is reported to influence myocardial performance. Recent studies have emphasised the importance of negative inotropic adipocyte-derived factors and their impact on cardiac contractile function. However, the underlying mechanisms remain unclear. We aimed to determine whether body mass impacts cardiac force development on the level of the contractile apparatus. We examined the influence of body mass index (BMI) (3 groups: group I >25, group II 25-30, group III >30) on the myocardial performance of skinned muscle fibres. Right atrial tissue preparations of 70 patients undergoing aortocoronary bypass operation (CABG, 48 patients, group a) and aortic valve replacement (AVR, 22 patients, group b) were obtained. The fibres were exposed to a gradual increase in the calcium concentration, and the force values were recorded. The statistical analysis was performed using Pearson's correlation (P<0.05 significant). A BMI >30 (group III) was associated with less force (mean force 1.58±0.1 mN, P=0.02, max force 2.24±0.17 mN, P=0.02 vs. group II (mean force 1.8±0.3 mN, P=0.04, max force 2.59±0.2 mN, P=0.03) and group I (mean force 1.8±0.1 mN, P=0,03, max force 2.62±0.3 mN, P=0.03). Dividing the groups in the post-surgical procedure, the impact of BMI on force development in group III was more intense in the CABG group compared to the AVR group: 2.0±0.2 mN vs. 2.4±0.1 mN, P=0.04. In accordance with the literature, a BMI >30 is associated with reduced force capacities. Additionally, the underlying cardiac disease may aggravate the impact of weight on cardiac force. Further studies are needed to evaluate the clinical relevance of this experimental observation and the potential consequences for the treatment of cardiac function.
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Affiliation(s)
- Constanze Bening
- Department of Cardiothoracic and Vascular Surgery, Johannes Gutenberg University, D-55122 Mainz, Germany.,Experimental Laboratory, Department of Cardiothoracic Surgery, University Hospital Würzburg, D-97080 Würzburg, Germany
| | - Khaled Hamouda
- Experimental Laboratory, Department of Cardiothoracic Surgery, University Hospital Würzburg, D-97080 Würzburg, Germany
| | - Christoph Schimmer
- Experimental Laboratory, Department of Cardiothoracic Surgery, University Hospital Würzburg, D-97080 Würzburg, Germany
| | - Rainier Leyh
- Experimental Laboratory, Department of Cardiothoracic Surgery, University Hospital Würzburg, D-97080 Würzburg, Germany
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15
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Karam CN, Warren CM, Henze M, Banke NH, Lewandowski ED, Solaro RJ. Peroxisome proliferator-activated receptor-α expression induces alterations in cardiac myofilaments in a pressure-overload model of hypertrophy. Am J Physiol Heart Circ Physiol 2017; 312:H681-H690. [PMID: 28130336 DOI: 10.1152/ajpheart.00469.2016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 01/04/2017] [Accepted: 01/17/2017] [Indexed: 01/22/2023]
Abstract
Although alterations in fatty acid (FA) metabolism have been shown to have a negative impact on contractility of the hypertrophied heart, the targets of action remain elusive. In this study we compared the function of skinned fiber bundles from transgenic (Tg) mice that overexpress a relatively low level of the peroxisome proliferator-activated receptor α (PPARα), and nontransgenic (NTg) littermates. The mice (NTg-T and Tg-T) were stressed by transverse aortic constriction (TAC) and compared with shams (NTg-S and Tg-S). There was an approximate 4-fold increase in PPARα expression in Tg-S compared with NTg-S, but Tg-T hearts showed the same PPARα expression as NTg-T. Expression of PPARα did not alter the hypertrophic response to TAC but did reduce ejection fraction (EF) in Tg-T hearts compared with other groups. The rate of actomyosin ATP hydrolysis was significantly higher in Tg-S skinned fiber bundles compared with all other groups. Tg-T hearts showed an increase in phosphorylation of specific sites on cardiac myosin binding protein-C (cMyBP-C) and β-myosin heavy chain isoform. These results advance our understanding of potential signaling to the myofilaments induced by altered FA metabolism under normal and pathological states. We demonstrate that chronic and transient PPARα activation during pathological stress alters myofilament response to Ca2+ through a mechanism that is possibly mediated by MyBP-C phosphorylation and myosin heavy chain isoforms.NEW & NOTEWORTHY Data presented here demonstrate novel signaling to sarcomeric proteins by chronic alterations in fatty acid metabolism induced by PPARα. The mechanism involves modifications of key myofilament regulatory proteins modifying cross-bridge dynamics with differential effects in controls and hearts stressed by pressure overload.
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Affiliation(s)
- Chehade N Karam
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois; and
| | - Chad M Warren
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois; and
| | - Marcus Henze
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois; and
| | - Natasha H Banke
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois; and
| | - E Douglas Lewandowski
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois; and.,Sanford Burnham Presbyterian Medical Discovery Institute, Orlando, Florida
| | - R John Solaro
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, Illinois; and
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16
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Circulating Histone Concentrations Differentially Affect the Predominance of Left or Right Ventricular Dysfunction in Critical Illness. Crit Care Med 2016; 44:e278-88. [PMID: 26588828 DOI: 10.1097/ccm.0000000000001413] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
OBJECTIVES Cardiac complications are common in critical illness and associated with grave consequences. In this setting, elevated circulating histone levels have been linked to cardiac injury and dysfunction in experimental models and patients with sepsis. The mechanisms underlying histone-induced cardiotoxicity and the functional consequences on left ventricle and right ventricle remain unclear. This study aims to examine dose-dependent effects of circulating histones on left ventricle and right ventricle function at clinically relevant concentrations. DESIGN Prospective laboratory study with in vitro and in vivo investigations. SETTING University research laboratory. SUBJECTS Twelve-week old male C57BL/6N mice. INTERVENTIONS Cultured cardiomyocytes were incubated with clinically relevant histone concentrations, and a histone infusion mouse model was also used with hemodynamic changes characterized by echocardiography and left ventricle/right ventricle catheter-derived variables. Circulating histones and cardiac troponin levels were obtained from serial blood samples. MEASUREMENTS AND MAIN RESULTS IV histone infusion caused time-dependent cardiac troponin elevation to indicate cardiac injury. At moderate sublethal histone doses (30 mg/kg), left ventricular contractile dysfunction was the prominent abnormality with reduced ejection fraction and prolonged relaxation time. At high doses (≥ 60 mg/kg), pulmonary vascular obstruction induced right ventricular pressure increase and dilatation, but left ventricular end-diastolic volume improved because of reduced blood return from the lungs. Mechanistically, histones induced profound calcium influx and overload in cultured cardiomyocytes with dose-dependent detrimental effects on intracellular calcium transient amplitude, contractility, and rhythm, suggesting that histones directly affect cardiomyocyte function adversely. However, increasing histone-induced neutrophil congestion, neutrophil extracellular trap formation, and thrombosis in the pulmonary microvasculature culminated in right ventricular dysfunction. Antihistone antibody treatment abrogated histone cardiotoxicity. CONCLUSIONS Circulating histones significantly compromise left ventricular and right ventricular function through different mechanisms that are dependent on histone concentrations. This provides a translational basis to explain and target the spectral manifestations of cardiac dysfunction in critical illness.
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17
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Michael JJ, Chandra M. Interplay Between the Effects of Dilated Cardiomyopathy Mutation (R206L) and the Protein Kinase C Phosphomimic (T204E) of Rat Cardiac Troponin T Are Differently Modulated by α- and β-Myosin Heavy Chain Isoforms. J Am Heart Assoc 2016; 5:e002777. [PMID: 27001966 PMCID: PMC4943253 DOI: 10.1161/jaha.115.002777] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background We hypothesized that the functional effects of R206L—a rat analog of the dilated cardiomyopathy (DCM) mutation R205L in human cardiac troponin T (TnT)—were differently modulated by myosin heavy chain (MHC) isoforms and T204E, a protein kinase C (PKC) phosphomimic of TnT. Our hypothesis was based on two observations: (1) α‐ and β‐MHC differentially influence the functional effects of TnT; and (2) PKC isoforms capable of phosphorylating TnT are upregulated in failing human hearts. Methods and Results We generated 4 recombinant TnT variants: wild type; R206L; T204E; and R206L+T204E. Functional effects of the TnT variants were tested in cardiac muscle fibers (minimum 14 per group) from normal (α‐MHC) and propylthiouracil‐treated rats (β‐MHC) using steady‐state and dynamic contractile measurements. Notably, in α‐MHC fibers, Ca2+‐activated maximal tension was attenuated by R206L (≈32%), T204E (≈63%), and R206L+T204E (≈64%). In β‐MHC fibers, maximal tension was unaffected by R206L, but was attenuated by T204E (≈33%) and R206L+T204E (≈40%). Thus, β‐MHC differentially counteracted the attenuating effects of the TnT variants on tension. However, in β‐MHC fibers, R206L+T204E attenuated tension to a greater extent when compared to T204E alone. In β‐MHC fibers, R206L+T204E attenuated the magnitude of the length‐mediated recruitment of new cross‐bridges (≈28%), suggesting that the Frank‐Starling mechanism was impaired. Conclusions Our findings are the first (to our knowledge) to demonstrate that the functional effects of a DCM‐linked TnT mutation are not only modulated by MHC isoforms, but also by the pathology‐associated post‐translational modifications of TnT.
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Affiliation(s)
- John Jeshurun Michael
- Department of Integrative Physiology and Neuroscience Washington State University, Pullman, WA
| | - Murali Chandra
- Department of Integrative Physiology and Neuroscience Washington State University, Pullman, WA
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18
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Kumar M, Govindan S, Zhang M, Khairallah RJ, Martin JL, Sadayappan S, de Tombe PP. Cardiac Myosin-binding Protein C and Troponin-I Phosphorylation Independently Modulate Myofilament Length-dependent Activation. J Biol Chem 2015; 290:29241-9. [PMID: 26453301 DOI: 10.1074/jbc.m115.686790] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Indexed: 11/06/2022] Open
Abstract
β-Adrenergic stimulation in heart leads to increased contractility and lusitropy via activation of protein kinase A (PKA). In the cardiac sarcomere, both cardiac myosin binding protein C (cMyBP-C) and troponin-I (cTnI) are prominent myofilament targets of PKA. Treatment of permeabilized myocardium with PKA induces enhanced myofilament length-dependent activation (LDA), the cellular basis of the Frank-Starling cardiac regulatory mechanism. It is not known, however, which of these targets mediates the altered LDA and to what extent. Here, we employed two genetic mouse models in which the three PKA sites in cMyBP-C were replaced with either phospho-mimic (DDD) or phospho-null (AAA) residues. AAA- or DDD-permeabilized myocytes (n = 12-17) were exchanged (~93%) for recombinant cTnI in which the two PKA sites were mutated to either phospho-mimic (DD) or phospho-null (AA) residues. Force-[Ca(2+)] relationships were determined at two sarcomere lengths (SL = 1.9 μm and SL = 2.3 μm). Data were fit to a modified Hill equation for each individual cell preparation at each SL. LDA was indexed as ΔEC50, the difference in [Ca(2+)] required to achieve 50% force activation at the two SLs. We found that PKA-mediated phosphorylation of cMyBP-C and cTnI each independently contribute to enhance myofilament length-dependent activation properties of the cardiac sarcomere, with relative contributions of ~67 and ~33% for cMyBP-C for cTnI, respectively. We conclude that β-adrenergic stimulation enhances the Frank-Starling regulatory mechanism predominantly via cMyBP-C PKA-mediated phosphorylation. We speculate that this molecular mechanism enhances cross-bridge formation at long SL while accelerating cross-bridge detachment and relaxation at short SLs.
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Affiliation(s)
- Mohit Kumar
- From the Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, Ilinois 60153
| | - Suresh Govindan
- From the Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, Ilinois 60153
| | - Mengjie Zhang
- From the Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, Ilinois 60153
| | - Ramzi J Khairallah
- From the Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, Ilinois 60153
| | - Jody L Martin
- From the Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, Ilinois 60153
| | - Sakthivel Sadayappan
- From the Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, Ilinois 60153
| | - Pieter P de Tombe
- From the Department of Cell and Molecular Physiology, Health Sciences Division, Loyola University Chicago, Maywood, Ilinois 60153
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19
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Dubois-Deruy E, Belliard A, Mulder P, Bouvet M, Smet-Nocca C, Janel S, Lafont F, Beseme O, Amouyel P, Richard V, Pinet F. Interplay between troponin T phosphorylation and O-N-acetylglucosaminylation in ischaemic heart failure. Cardiovasc Res 2015; 107:56-65. [PMID: 25916824 DOI: 10.1093/cvr/cvv136] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 04/15/2015] [Indexed: 11/13/2022] Open
Abstract
AIMS Previous studies have reported that decreased serine 208 phosphorylation of troponin T (TnTpSer208) is associated with ischaemic heart failure (HF), but the molecular mechanisms and functional consequences of these changes are unknown. The aim of this study was to characterize the balance between serine phosphorylation and O-N-acetylglucosaminylation (O-GlcNAcylation) of TnT in HF, its mechanisms, and the consequences of modulating these post-translational modifications. METHODS AND RESULTS Decreased TnTpSer208 levels in the left ventricles of HF male Wistar rats were associated with reduced expression of PKCε but not of other cardiac PKC isoforms. In both isolated perfused rat hearts and cultured neonatal cardiomyocytes, the PKCε inhibitor εV1-2 decreased TnTpSer208 and simultaneously decreased cardiac contraction in isolated hearts and beating amplitude in neonatal cardiomyocytes (measured by atomic force microscopy). Down-regulating PKCε by silencing RNA (siRNA) also reduced TnTpSer208 in these cardiomyocytes, and PKCε-/- mice had lower TnTpSer208 levels than the wild-type. In parallel, HF increased TnT O-GlcNAcylation via both increased O-GlcNAc transferase and decreased O-GlcNAcase activity. Increasing O-GlcNAcylation (via O-GlcNAcase inhibition with Thiamet G) decreased TnTpSer208 in isolated hearts, while reducing O-GlcNAcylation (O-GlcNAc transferase siRNA) increased TnTpSer208 in neonatal cardiomyocytes. Mass spectrometry and NMR analysis identified O-GlcNAcylation of TnT on Ser190. CONCLUSION These data demonstrate interplay between Ser208 phosphorylation and Ser190 O-GlcNAcylation of TnT in ischaemic HF, linked to decreased activity of both PKCε and O-GlcNAcase and increased O-GlcNAc transferase activity. Modulation of these post-translational modifications of TnT may be a new therapeutic strategy in HF.
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Affiliation(s)
- Emilie Dubois-Deruy
- INSERM, U1167, 1 rue du Professeur Calmette, Lille, France Institut Pasteur de Lille, Lille, France University of Lille Nord de France, Lille, France
| | - Aude Belliard
- INSERM, U1167, 1 rue du Professeur Calmette, Lille, France Institut Pasteur de Lille, Lille, France University of Lille Nord de France, Lille, France
| | - Paul Mulder
- Inserm U1096, Rouen, France Institute for Research and Innovation in Biomedicine, University of Rouen, Rouen, France
| | - Marion Bouvet
- INSERM, U1167, 1 rue du Professeur Calmette, Lille, France Institut Pasteur de Lille, Lille, France University of Lille Nord de France, Lille, France
| | - Caroline Smet-Nocca
- University of Lille Nord de France, Lille, France CNRS UMR 8576, Villeneuve D'Ascq, France
| | | | - Frank Lafont
- Institut Pasteur de Lille, Lille, France University of Lille Nord de France, Lille, France Bioimaging Center Lille Nord de France, Lille, France CNRS UMR 8204, INSERM U1019, Lille, France
| | - Olivia Beseme
- INSERM, U1167, 1 rue du Professeur Calmette, Lille, France Institut Pasteur de Lille, Lille, France University of Lille Nord de France, Lille, France
| | - Philippe Amouyel
- INSERM, U1167, 1 rue du Professeur Calmette, Lille, France Institut Pasteur de Lille, Lille, France University of Lille Nord de France, Lille, France Centre Hospitalier Régional et Universitaire de Lille, Lille, France
| | - Vincent Richard
- Inserm U1096, Rouen, France Institute for Research and Innovation in Biomedicine, University of Rouen, Rouen, France
| | - Florence Pinet
- INSERM, U1167, 1 rue du Professeur Calmette, Lille, France Institut Pasteur de Lille, Lille, France University of Lille Nord de France, Lille, France
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The R21C Mutation in Cardiac Troponin I Imposes Differences in Contractile Force Generation between the Left and Right Ventricles of Knock-In Mice. BIOMED RESEARCH INTERNATIONAL 2015; 2015:742536. [PMID: 25961037 PMCID: PMC4415466 DOI: 10.1155/2015/742536] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 12/16/2014] [Accepted: 12/19/2014] [Indexed: 01/20/2023]
Abstract
We investigated the effect of the hypertrophic cardiomyopathy-linked R21C (arginine to cysteine) mutation in human cardiac troponin I (cTnI) on the contractile properties and myofilament protein phosphorylation in papillary muscle preparations from left (LV) and right (RV) ventricles of homozygous R21C(+/+) knock-in mice. The maximal steady-state force was significantly reduced in skinned papillary muscle strips from the LV compared to RV, with the latter displaying the level of force observed in LV or RV from wild-type (WT) mice. There were no differences in the Ca(2+) sensitivity between the RV and LV of R21C(+/+) mice; however, the Ca(2+) sensitivity of force was higher in RV-R21C(+/+) compared with RV-WT and lower in LV- R21C(+/+) compared with LV-WT. We also observed partial loss of Ca(2+) regulation at low [Ca(2+)]. In addition, R21C(+/+)-KI hearts showed no Ser23/24-cTnI phosphorylation compared to LV or RV of WT mice. However, phosphorylation of the myosin regulatory light chain (RLC) was significantly higher in the RV versus LV of R21C(+/+) mice and versus LV and RV of WT mice. The difference in RLC phosphorylation between the ventricles of R21C(+/+) mice likely contributes to observed differences in contractile force and the lower tension monitored in the LV of HCM mice.
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21
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Nagwekar J, Duggal D, Rich R, Raut S, Fudala R, Gryczynski I, Gryczynski Z, Borejdo J. The spatial distribution of actin and mechanical cycle of myosin are different in right and left ventricles of healthy mouse hearts. Biochemistry 2014; 53:7641-9. [PMID: 25488019 PMCID: PMC4262935 DOI: 10.1021/bi501175s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
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The contraction of the right ventricle
(RV) expels blood into the
pulmonary circulation, and the contraction of the left ventricle (LV)
pumps blood into the systemic circulation through the aorta. The respective
afterloads imposed on the LV and RV by aortic and pulmonary artery
pressures create very different mechanical requirements for the two
ventricles. Indeed, differences have been observed in the contractile
performance between left and right ventricular myocytes in dilated
cardiomyopathy, in congestive heart failure, and in energy usage and
speed of contraction at light loads in healthy hearts. In spite of
these functional differences, it is commonly believed that the right
and left ventricular muscles are identical because there were no differences
in stress development, twitch duration, work performance, or power
among the RV and LV in dogs. This report shows that on a mesoscopic
scale [when only a few molecules are studied (here three to six molecules
of actin) in ex vivo ventricular myofibrils], the
two ventricles in rigor differ in the degree of orientational disorder
of actin within in filaments and during contraction in the kinetics
of the cross-bridge cycle.
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Affiliation(s)
- J Nagwekar
- Department of Cell Biology and Center for Fluorescence Technology and Nanomedicine, University of North Texas Health Science Center , 3500 Camp Bowie Boulevard, Fort Worth, Texas 76107, United States
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Effects of pseudo-phosphorylated rat cardiac troponin T are differently modulated by α- and β-myosin heavy chain isoforms. Basic Res Cardiol 2014; 109:442. [PMID: 25301196 DOI: 10.1007/s00395-014-0442-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 08/31/2014] [Accepted: 09/18/2014] [Indexed: 10/24/2022]
Abstract
Interplay between the protein kinase C (PKC)-mediated phosphorylation of troponin T (TnT)- and myosin heavy chain (MHC)-mediated effects on thin filaments takes on a new significance because: (1) there is significant interaction between the TnT- and MHC-mediated effects on cardiac thin filaments; (2) although the phosphorylation of TnT by PKC isoforms is common to both human and rodent hearts, human hearts predominantly express β-MHC while rodent hearts predominantly express α-MHC. Therefore, we tested how α- and β-MHC isoforms differently affected the functional effects of phosphorylated TnT. Contractile measurements were made on cardiac muscle fibers from normal rats (α-MHC) and propylthiouracil-treated rats (β-MHC), reconstituted with the recombinant phosphomimetic-TnT (T204E; threonine 204 replaced by glutamate). Ca2+ -activated maximal tension decreased differently in α-MHC + T204E (~68%) and β-MHC + T204E (~35%). However, myofilament Ca2+ sensitivity decreased similarly in α-MHC + T204E and β-MHC + T204E, demonstrating that a decrease in Ca2+ sensitivity alone cannot explain the greater attenuation of tension in α-MHC + T204E. Interestingly, dynamic contractile parameters (rates of tension redevelopment, crossbridge (XB) recruitment dynamics, XB distortion dynamics, and XB detachment kinetics) decreased only in α-MHC + T204E. Thus, the transition of thin filaments from the blocked- to closed-state was attenuated in α-MHC + T204E and β-MHC + T204E, but the closed- to open-state transition was attenuated only in α-MHC + T204E. Our study demonstrates that the effects of phosphorylated TnT and MHC isoforms interact to bring about different functional states of cardiac thin filaments.
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23
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Wilson K, Guggilam A, West TA, Zhang X, Trask AJ, Cismowski MJ, de Tombe P, Sadayappan S, Lucchesi PA. Effects of a myofilament calcium sensitizer on left ventricular systolic and diastolic function in rats with volume overload heart failure. Am J Physiol Heart Circ Physiol 2014; 307:H1605-17. [PMID: 25260618 DOI: 10.1152/ajpheart.00423.2014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Aortocaval fistula (ACF)-induced volume overload (VO) heart failure (HF) results in progressive left ventricular (LV) dysfunction. Hemodynamic load reversal during pre-HF (4 wk post-ACF; REV) results in rapid structural but delayed functional recovery. This study investigated myocyte and myofilament function in ACF and REV and tested the hypothesis that a myofilament Ca(2+) sensitizer would improve VO-induced myofilament dysfunction in ACF and REV. Following the initial sham or ACF surgery in male Sprague-Dawley rats (200-240 g) at week 0, REV surgery and experiments were performed at weeks 4 and 8, respectively. In ACF, decreased LV function is accompanied by impaired sarcomeric shortening and force generation and decreased Ca(2+) sensitivity, whereas, in REV, impaired LV function is accompanied by decreased Ca(2+) sensitivity. Intravenous levosimendan (Levo) elicited the best inotropic and lusitropic responses and was selected for chronic oral studies. Subsets of ACF and REV rats were given vehicle (water) or Levo (1 mg/kg) in drinking water from weeks 4-8. Levo improved systolic (% fractional shortening, end-systolic elastance, and preload-recruitable stroke work) and diastolic (τ, dP/dtmin) function in ACF and REV. Levo improved Ca(2+) sensitivity without altering the amplitude and kinetics of the intracellular Ca(2+) transient. In ACF-Levo, increased cMyBP-C Ser-273 and Ser-302 and cardiac troponin I Ser-23/24 phosphorylation correlated with improved diastolic relaxation, whereas, in REV-Levo, increased cMyBP-C Ser-273 phosphorylation and increased α-to-β-myosin heavy chain correlated with improved diastolic relaxation. We concluded that Levo improves LV function, and myofilament composition and regulatory protein phosphorylation likely play a key role in improving function.
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Affiliation(s)
- Kristin Wilson
- Center for Cardiovascular and Pulmonary Research and The Heart Center, Nationwide Children's Hospital, Columbus, Ohio; Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio
| | - Anuradha Guggilam
- Center for Cardiovascular and Pulmonary Research and The Heart Center, Nationwide Children's Hospital, Columbus, Ohio
| | - T Aaron West
- Center for Cardiovascular and Pulmonary Research and The Heart Center, Nationwide Children's Hospital, Columbus, Ohio
| | - Xiaojin Zhang
- Center for Cardiovascular and Pulmonary Research and The Heart Center, Nationwide Children's Hospital, Columbus, Ohio
| | - Aaron J Trask
- Center for Cardiovascular and Pulmonary Research and The Heart Center, Nationwide Children's Hospital, Columbus, Ohio; Department of Pediatrics, College of Medicine, The Ohio State University, Columbus, Ohio
| | - Mary J Cismowski
- Center for Cardiovascular and Pulmonary Research and The Heart Center, Nationwide Children's Hospital, Columbus, Ohio; Department of Pediatrics, College of Medicine, The Ohio State University, Columbus, Ohio
| | - Pieter de Tombe
- Department of Cellular and Molecular Physiology, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois
| | - Sakthivel Sadayappan
- Department of Cellular and Molecular Physiology, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois
| | - Pamela A Lucchesi
- Center for Cardiovascular and Pulmonary Research and The Heart Center, Nationwide Children's Hospital, Columbus, Ohio; Department of Pediatrics, College of Medicine, The Ohio State University, Columbus, Ohio;
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24
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Katrukha IA, Gusev NB. Enigmas of cardiac troponin T phosphorylation. J Mol Cell Cardiol 2013; 65:156-8. [PMID: 24120912 DOI: 10.1016/j.yjmcc.2013.09.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Revised: 09/27/2013] [Accepted: 09/30/2013] [Indexed: 10/26/2022]
Affiliation(s)
- Ivan A Katrukha
- Department of Biochemistry, School of Biology, Moscow State University, Moscow 119991 Russian Federation
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25
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Posttranslational modifications of cardiac troponin T: An overview. J Mol Cell Cardiol 2013; 63:47-56. [DOI: 10.1016/j.yjmcc.2013.07.004] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 06/18/2013] [Accepted: 07/08/2013] [Indexed: 12/22/2022]
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Zalvidea S, André L, Loyer X, Cassan C, Sainte-Marie Y, Thireau J, Sjaastad I, Heymes C, Pasquié JL, Cazorla O, Aimond F, Richard S. ACE inhibition prevents diastolic Ca2+ overload and loss of myofilament Ca2+ sensitivity after myocardial infarction. Curr Mol Med 2012; 12:206-17. [PMID: 22280358 DOI: 10.2174/156652412798889045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 11/22/2011] [Accepted: 11/23/2011] [Indexed: 01/14/2023]
Abstract
Prevention of adverse cardiac remodeling after myocardial infarction (MI) remains a therapeutic challenge. Angiotensin-converting enzyme inhibitors (ACE-I) are a well-established first-line treatment. ACE-I delay fibrosis, but little is known about their molecular effects on cardiomyocytes. We investigated the effects of the ACE-I delapril on cardiomyocytes in a mouse model of heart failure (HF) after MI. Mice were randomly assigned to three groups: Sham, MI, and MI-D (6 weeks of treatment with a non-hypotensive dose of delapril started 24h after MI). Echocardiography and pressure-volume loops revealed that MI induced hypertrophy and dilation, and altered both contraction and relaxation of the left ventricle. At the cellular level, MI cardiomyocytes exhibited reduced contraction, slowed relaxation, increased diastolic Ca2+ levels, decreased Ca2+-transient amplitude, and diminished Ca2+ sensitivity of myofilaments. In MI-D mice, however, both mortality and cardiac remodeling were decreased when compared to non-treated MI mice. Delapril maintained cardiomyocyte contraction and relaxation, prevented diastolic Ca2+ overload and retained the normal Ca2+ sensitivity of contractile proteins. Delapril maintained SERCA2a activity through normalization of P-PLB/PLB (for both Ser16- PLB and Thr17-PLB) and PLB/SERCA2a ratios in cardiomyocytes, favoring normal reuptake of Ca2+ in the sarcoplasmic reticulum. In addition, delapril prevented defective cTnI function by normalizing the expression of PKC, enhanced in MI mice. In conclusion, early therapy with delapril after MI preserved the normal contraction/relaxation cycle of surviving cardiomyocytes with multiple direct effects on key intracellular mechanisms contributing to preserve cardiac function.
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Affiliation(s)
- S Zalvidea
- INSERM U-1046, Université Montpellier1 & Montpellier2, Montpellier, France
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