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Klinova SV, Minigalieva IA, Protsenko YL, Sutunkova MP, Gurvich VB, Ryabova JV, Valamina IE, Gerzen OP, Nabiev SR, Balakin AA, Lookin ON, Lisin RV, Kuznetsov DA, Privalova LI, Panov VG, Katsnelson LB, Nikitina LV, Katsnelson BA. Changes in the Cardiotoxic Effects of Lead Intoxication in Rats Induced by Muscular Exercise. Int J Mol Sci 2022; 23:ijms23084417. [PMID: 35457235 PMCID: PMC9029617 DOI: 10.3390/ijms23084417] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 04/12/2022] [Accepted: 04/13/2022] [Indexed: 11/17/2022] Open
Abstract
Exposure to lead is associated with an increased risk of cardiovascular diseases. Outbred white male rats were injected with lead acetate intraperitoneally three times a week and/or were forced to run at a speed of 25 m/min for 10 min 5 days a week. We performed noninvasive recording of arterial pressure, electrocardiogram and breathing parameters, and assessed some biochemical characteristics. Electrophoresis in polyacrylamide gel was used to determine the ratio of myosin heavy chains. An in vitro motility assay was employed to measure the sliding velocity of regulated thin filaments on myosin. Isolated multicellular preparations of the right ventricle myocardium were used to study contractility in isometric and physiological modes of contraction. Exercise under lead intoxication normalized the level of calcium and activity of the angiotensin-converting enzyme in the blood serum, normalized the isoelectric line voltage and T-wave amplitude on the electrocardiogram, increased the level of creatine kinase-MB and reduced the inspiratory rate. Additionally, the maximum sliding velocity and the myosin heavy chain ratio were partly normalized. The effect of exercise under lead intoxication on myocardial contractility was found to be variable. In toto, muscular loading was found to attenuate the effects of lead intoxication, as judged by the indicators of the cardiovascular system.
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Affiliation(s)
- Svetlana V. Klinova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
| | - Ilzira A. Minigalieva
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
| | - Yuri L. Protsenko
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Marina P. Sutunkova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
| | - Vladimir B. Gurvich
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
| | - Julia V. Ryabova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
| | - Irene E. Valamina
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
| | - Oksana P. Gerzen
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Salavat R. Nabiev
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Alexander A. Balakin
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Oleg N. Lookin
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Ruslan V. Lisin
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Daniil A. Kuznetsov
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Larisa I. Privalova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
| | - Vladimir G. Panov
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
- Institute of Industrial Ecology, The Urals Branch of the Russian Academy of Sciences, 620049 Ekaterinburg, Russia
| | - Leonid B. Katsnelson
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Larisa V. Nikitina
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (Y.L.P.); (O.P.G.); (S.R.N.); (A.A.B.); (O.N.L.); (R.V.L.); (D.A.K.); (L.B.K.); (L.V.N.)
| | - Boris A. Katsnelson
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (M.P.S.); (V.B.G.); (J.V.R.); (I.E.V.); (L.I.P.); (V.G.P.)
- Correspondence: ; Tel.: +7-343-253-04-21 or +7-922-126-30-90; Fax: +7-343-3717-740
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Klinova SV, Katsnelson BA, Minigalieva IA, Gerzen OP, Balakin AA, Lisin RV, Butova KA, Nabiev SR, Lookin ON, Katsnelson LB, Privalova LI, Kuznetsov DA, Shur VY, Shishkina EV, Makeev OH, Valamina IE, Panov VG, Sutunkova MP, Nikitina LV, Protsenko YL. Cardioinotropic Effects in Subchronic Intoxication of Rats with Lead and/or Cadmium Oxide Nanoparticles. Int J Mol Sci 2021; 22:ijms22073466. [PMID: 33801669 PMCID: PMC8036427 DOI: 10.3390/ijms22073466] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 01/31/2023] Open
Abstract
Subchronic intoxication was induced in outbred male rats by repeated intraperitoneal injections with lead oxide (PbO) and/or cadmium oxide (CdO) nanoparticles (NPs) 3 times a week during 6 weeks for the purpose of examining its effects on the contractile characteristics of isolated right ventricle trabeculae and papillary muscles in isometric and afterload contractions. Isolated and combined intoxication with these NPs was observed to reduce the mechanical work produced by both types of myocardial preparation. Using the in vitro motility assay, we showed that the sliding velocity of regulated thin filaments drops under both isolated and combined intoxication with CdO–NP and PbO–NP. These results correlate with a shift in the expression of myosin heavy chain (MHC) isoforms towards slowly cycling β–MHC. The type of CdO–NP + PbO–NP combined cardiotoxicity depends on the effect of the toxic impact, the extent of this effect, the ratio of toxicant doses, and the degree of stretching of cardiomyocytes and muscle type studied. Some indices of combined Pb–NP and CdO–NP cardiotoxicity and general toxicity (genotoxicity included) became fully or partly normalized if intoxication developed against background administration of a bioprotective complex.
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Affiliation(s)
- Svetlana V. Klinova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (L.I.P.); (V.G.P.); (M.P.S.)
| | - Boris A. Katsnelson
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (L.I.P.); (V.G.P.); (M.P.S.)
- Correspondence: ; Tel.: +7-343-253-04-21; Fax: +7-343-3717-740; Cell: +7-922-126-30-90
| | - Ilzira A. Minigalieva
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (L.I.P.); (V.G.P.); (M.P.S.)
| | - Oksana P. Gerzen
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Alexander A. Balakin
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Ruslan V. Lisin
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Ksenia A. Butova
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Salavat R. Nabiev
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Oleg N. Lookin
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Leonid B. Katsnelson
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Larisa I. Privalova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (L.I.P.); (V.G.P.); (M.P.S.)
| | - Daniil A. Kuznetsov
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Vladimir Ya. Shur
- School of Natural Sciences and Mathematics, The Ural Federal University, 620002 Ekaterinburg, Russia; (V.Y.S.); (E.V.S.)
| | - Ekaterina V. Shishkina
- School of Natural Sciences and Mathematics, The Ural Federal University, 620002 Ekaterinburg, Russia; (V.Y.S.); (E.V.S.)
| | - Oleg H. Makeev
- The Central Research Laboratory, The Ural State Medical University, 620014 Yekaterinburg, Russia; (O.H.M.); (I.E.V.)
| | - Irene E. Valamina
- The Central Research Laboratory, The Ural State Medical University, 620014 Yekaterinburg, Russia; (O.H.M.); (I.E.V.)
| | - Vladimir G. Panov
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (L.I.P.); (V.G.P.); (M.P.S.)
- Institute of Industrial Ecology, The Urals Branch of the Russian Academy of Sciences, 620049 Ekaterinburg, Russia
| | - Marina P. Sutunkova
- Yekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 620014 Yekaterinburg, Russia; (S.V.K.); (I.A.M.); (L.I.P.); (V.G.P.); (M.P.S.)
| | - Larisa V. Nikitina
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
| | - Yuri L. Protsenko
- Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences, 620049 Yekaterinburg, Russia; (O.P.G.); (A.A.B.); (R.V.L.); (K.A.B.); (S.R.N.); (O.N.L.); (L.B.K.); (D.A.K.); (L.V.N.); (Y.L.P.)
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Shchepkin DV, Nikitina LV, Bershitsky SY, Kopylova GV. The isoforms of α-actin and myosin affect the Ca 2+ regulation of the actin-myosin interaction in the heart. Biochem Biophys Res Commun 2017. [PMID: 28623140 DOI: 10.1016/j.bbrc.2017.06.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Myocardium of mammals contains a wide range of isoforms of proteins that provides contractile function of the heart. These are two isoforms of ventricular and two of atrial myosin, α- and β-tropomyosin, and two isoforms of α-actin: cardiac and skeletal. We believe that the difference in the amino acid sequence of α-actin can affect the calcium regulation of the actin-myosin interaction. To test this hypothesis, we investigated effects of the isoforms of α-actin, cardiac and skeletal, and the isoforms of cardiac myosin on the calcium regulation of the actin-myosin interaction in an in vitro motility assay using reconstructed regulated thin filaments. The results show that isoforms of α-actin and the ratio of α/β-chains of Tpm differently affect the calcium regulation of the actin-myosin interaction in myocardium in dependence on cardiac myosin isoforms.
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Affiliation(s)
- Daniil V Shchepkin
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg 620049, Russia
| | - Larisa V Nikitina
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg 620049, Russia
| | - Sergey Y Bershitsky
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg 620049, Russia
| | - Galina V Kopylova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg 620049, Russia.
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Nikitina LV, Kopylova GV, Shchepkin DV, Nabiev SR, Bershitsky SY. Investigations of Molecular Mechanisms of Actin-Myosin Interactions in Cardiac Muscle. BIOCHEMISTRY (MOSCOW) 2016; 80:1748-63. [PMID: 26878579 DOI: 10.1134/s0006297915130106] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The functional characteristics of cardiac muscle depend on the composition of protein isoforms in the cardiomyocyte contractile machinery. In the ventricular myocardium of mammals, several isoforms of contractile and regulatory proteins are expressed - two isoforms of myosin (V1 and V3) and three isoforms of tropomyosin chains (α, β, and κ). Expression of protein isoforms depends on the animal species, its age and hormonal status, and this can change with pathologies of the myocardium. Mutations in these proteins can lead to cardiomyopathies. The functional significance of the protein isoform composition has been studied mainly on intact hearts or on isolated preparations of myocardium, which could not provide a clear comprehension of the role of each particular isoform. Present-day experimental techniques such as an optical trap and in vitro motility assay make it possible to investigate the phenomena of interactions of contractile and regulatory proteins on the molecular level, thus avoiding effects associated with properties of a whole muscle or muscle tissue. These methods enable free combining of the isoforms to test the molecular mechanisms of their participation in the actin-myosin interaction. Using the optical trap and the in vitro motility assay, we have studied functional characteristics of the cardiac myosin isoforms, molecular mechanisms of the calcium-dependent regulation of actin-myosin interaction, and the role of myosin and tropomyosin isoforms in the cooperativity mechanisms in myocardium. The knowledge of molecular mechanisms underlying myocardial contractility and its regulation is necessary for comprehension of cardiac muscle functioning, its disorders in pathologies, and for development of approaches for their correction.
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Affiliation(s)
- L V Nikitina
- Institute of Immunology and Physiology, Ural Division of the Russian Academy of Sciences, Ekaterinburg, 620041, Russia.
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Dokuchaev AD, Shikhaleva EV, Sulman TB, Vikulova NA, Nikitina LV, Katsnelson LB. Cooperativity in mechano-calcium feedbacks in the myocardium: Some conceptual discrepancies and overcoming inconsistency within the framework of a mathematical model. Biophysics (Nagoya-shi) 2016. [DOI: 10.1134/s0006350916050043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Kopylova G, Nabiev S, Nikitina L, Shchepkin D, Bershitsky S. The properties of the actin-myosin interaction in the heart muscle depend on the isoforms of myosin but not of α-actin. Biochem Biophys Res Commun 2016; 476:648-653. [PMID: 27264951 DOI: 10.1016/j.bbrc.2016.06.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 06/02/2016] [Indexed: 11/27/2022]
Abstract
In myocardium of mammals there are two isoforms of myosin heavy chains, α and β. In ventricle, together with ventricular isoforms of light chains they form two isomyosins: V1 and V3, homodimers of α- and β-heavy chains, respectively. In atria, α- and β-heavy chains together with atrial light chains form A1 (αα) and A2 (ββ) isomyosins. Besides in myocardium two isoforms of α-actin, skeletal and cardiac, are expressed. We assume that the differences in the amino acid sequence of cardiac and skeletal actin may affect its interaction with myosin. To test this hypothesis, we investigated characteristics of actin-myosin interactions of cardiac and skeletal isoforms of α-actin with the isoforms of cardiac myosin using an optical trap technique and an in vitro motility assay. It was found that the mechanical and kinetic characteristics of the interactions of the isoforms of cardiac myosin with actin depend on the isoforms of myosin not α-actin.
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Affiliation(s)
- G Kopylova
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg, 620049, Russia.
| | - S Nabiev
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg, 620049, Russia
| | - L Nikitina
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg, 620049, Russia
| | - D Shchepkin
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg, 620049, Russia
| | - S Bershitsky
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg, 620049, Russia
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Scheid LM, Mosqueira M, Hein S, Kossack M, Juergensen L, Mueller M, Meder B, Fink RH, Katus HA, Hassel D. Essential light chain S195 phosphorylation is required for cardiac adaptation under physical stress. Cardiovasc Res 2016; 111:44-55. [DOI: 10.1093/cvr/cvw066] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 03/18/2016] [Indexed: 01/10/2023] Open
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Shchepkin D, Kopylova G, Nikitina L. Study of reciprocal effects of cardiac myosin and tropomyosin isoforms on actin–myosin interaction with in vitro motility assay. Biochem Biophys Res Commun 2011; 415:104-8. [DOI: 10.1016/j.bbrc.2011.10.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Accepted: 10/06/2011] [Indexed: 10/16/2022]
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Shchepkin DV, Kopylova GV, Nikitina LV, Katsnelson LB, Bershitsky SY. Effects of cardiac myosin binding protein-C on the regulation of interaction of cardiac myosin with thin filament in an in vitro motility assay. Biochem Biophys Res Commun 2010; 401:159-63. [PMID: 20849827 DOI: 10.1016/j.bbrc.2010.09.040] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Accepted: 09/09/2010] [Indexed: 11/24/2022]
Abstract
Modulatory role of whole cardiac myosin binding protein-C (сMyBP-C) in regulation of cardiac muscle contractility was studied in the in vitro motility assay with rabbit cardiac myosin as a motor protein. The effects of cMyBP-C on the interaction of cardiac myosin with regulated thin filament were tested in both in vitro motility and ATPase assays. We demonstrate that the addition of cMyBP-C increases calcium regulated Mg-ATPase activity of cardiac myosin at submaximal calcium. The Hill coefficient for 'pCa-velocity' relation in the in vitro motility assay decreased and the calcium sensitivity increased when сMyBP-C was added. Results of our experiments testifies in favor of the hypothesis that сMyBP-C slows down cross-bridge kinetics when binding to actin.
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Affiliation(s)
- D V Shchepkin
- Institute of Immunology and Physiology, Russian Academy of Sciences, Yekaterinburg 620041, Russia.
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Nabiev SR, Ovsyannikov DA, Bershitsky BY, Bershitsky SY. Optical trap as a tool for studying motor proteins. Biophysics (Nagoya-shi) 2009. [DOI: 10.1134/s0006350908060031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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