Empagliflozin Attenuates Myocardial Sodium and Calcium Dysregulation and Reverses Cardiac Remodeling in Streptozotocin-Induced Diabetic Rats

Diabetes mellitus (DM) has significant effects on cardiac calcium (Ca ) and sodium (Na⁺) regulation. Clinical studies have shown that empagliflozin (Jardiance™) has cardiovascular benefits, however the mechanisms have not been fully elucidated. This study aimed to investigate whether empagliflozin m...

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Veröffentlicht in:International journal of molecular sciences 2019-04, Vol.20 (7), p.1680
Hauptverfasser: Lee, Ting-I, Chen, Yao-Chang, Lin, Yung-Kuo, Chung, Cheng-Chih, Lu, Yen-Yu, Kao, Yu-Hsun, Chen, Yi-Jen
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container_title International journal of molecular sciences
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Chen, Yao-Chang
Lin, Yung-Kuo
Chung, Cheng-Chih
Lu, Yen-Yu
Kao, Yu-Hsun
Chen, Yi-Jen
description Diabetes mellitus (DM) has significant effects on cardiac calcium (Ca ) and sodium (Na⁺) regulation. Clinical studies have shown that empagliflozin (Jardiance™) has cardiovascular benefits, however the mechanisms have not been fully elucidated. This study aimed to investigate whether empagliflozin modulates cardiac electrical activity as well as Ca /Na⁺ homeostasis in DM cardiomyopathy. Electrocardiography, echocardiography, whole-cell patch-clamp, confocal microscopic examinations, and Western blot, were performed in the ventricular myocytes of control and streptozotocin-induced DM rats, with or without empagliflozin (10 mg/kg for 4 weeks). The results showed that the control and empagliflozin-treated DM rats had smaller left ventricular end-diastolic diameters and shorter QT intervals than the DM rats. In addition, the prolonged action potential duration in the DM rats was attenuated in the empagliflozin-treated DM rats. Moreover, the DM rats had smaller sarcoplasmic reticular Ca contents, intracellular Ca transients, L-type Ca , reverse mode Na⁺-Ca exchanger currents, lower protein expressions of sarcoplasmic reticulum ATPase, ryanodine receptor 2 (RyR2), but higher protein expressions of phosphorylated RyR2 at serine 2808 than the control and empagliflozin-treated DM rats. The incidence and frequency of Ca sparks, cytosolic and mitochondrial reactive oxygen species, and late Na⁺ current and Na⁺/hydrogen-exchanger currents were greater in the DM rats than in the control and empagliflozin-treated DM rats. Empagliflozin significantly changed Ca regulation, late Na⁺ and Na⁺/hydrogen-exchanger currents and electrophysiological characteristics in DM cardiomyopathy, which may contribute to its cardioprotective benefits in DM patients.
doi_str_mv 10.3390/ijms20071680
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Clinical studies have shown that empagliflozin (Jardiance™) has cardiovascular benefits, however the mechanisms have not been fully elucidated. This study aimed to investigate whether empagliflozin modulates cardiac electrical activity as well as Ca /Na⁺ homeostasis in DM cardiomyopathy. Electrocardiography, echocardiography, whole-cell patch-clamp, confocal microscopic examinations, and Western blot, were performed in the ventricular myocytes of control and streptozotocin-induced DM rats, with or without empagliflozin (10 mg/kg for 4 weeks). The results showed that the control and empagliflozin-treated DM rats had smaller left ventricular end-diastolic diameters and shorter QT intervals than the DM rats. In addition, the prolonged action potential duration in the DM rats was attenuated in the empagliflozin-treated DM rats. Moreover, the DM rats had smaller sarcoplasmic reticular Ca contents, intracellular Ca transients, L-type Ca , reverse mode Na⁺-Ca exchanger currents, lower protein expressions of sarcoplasmic reticulum ATPase, ryanodine receptor 2 (RyR2), but higher protein expressions of phosphorylated RyR2 at serine 2808 than the control and empagliflozin-treated DM rats. The incidence and frequency of Ca sparks, cytosolic and mitochondrial reactive oxygen species, and late Na⁺ current and Na⁺/hydrogen-exchanger currents were greater in the DM rats than in the control and empagliflozin-treated DM rats. Empagliflozin significantly changed Ca regulation, late Na⁺ and Na⁺/hydrogen-exchanger currents and electrophysiological characteristics in DM cardiomyopathy, which may contribute to its cardioprotective benefits in DM patients.</description><identifier>ISSN: 1422-0067</identifier><identifier>ISSN: 1661-6596</identifier><identifier>EISSN: 1422-0067</identifier><identifier>DOI: 10.3390/ijms20071680</identifier><identifier>PMID: 30987285</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Animals ; Antidiabetics ; Benzhydryl Compounds - therapeutic use ; Blood ; Body size ; Body weight ; Calcium - metabolism ; Calcium homeostasis ; Calcium ions ; Cardiac muscle ; Cardiomyopathy ; Cell size ; Diabetes mellitus ; Diabetes Mellitus, Experimental - drug therapy ; Diabetes Mellitus, Experimental - metabolism ; EKG ; Electrocardiography ; Electrophysiology ; Glucosides - therapeutic use ; Heart ; Homeostasis ; Hypertension ; Myocardium - metabolism ; Myocytes ; Myocytes, Cardiac - drug effects ; Myocytes, Cardiac - metabolism ; Oxidative stress ; Potassium ; Rats ; Rodents ; Ryanodine Receptor Calcium Release Channel - metabolism ; Signal transduction ; Sodium ; Sodium - metabolism ; Sodium-Calcium Exchanger - metabolism ; Streptozocin ; Ventricle</subject><ispartof>International journal of molecular sciences, 2019-04, Vol.20 (7), p.1680</ispartof><rights>2019. 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Clinical studies have shown that empagliflozin (Jardiance™) has cardiovascular benefits, however the mechanisms have not been fully elucidated. This study aimed to investigate whether empagliflozin modulates cardiac electrical activity as well as Ca /Na⁺ homeostasis in DM cardiomyopathy. Electrocardiography, echocardiography, whole-cell patch-clamp, confocal microscopic examinations, and Western blot, were performed in the ventricular myocytes of control and streptozotocin-induced DM rats, with or without empagliflozin (10 mg/kg for 4 weeks). The results showed that the control and empagliflozin-treated DM rats had smaller left ventricular end-diastolic diameters and shorter QT intervals than the DM rats. In addition, the prolonged action potential duration in the DM rats was attenuated in the empagliflozin-treated DM rats. Moreover, the DM rats had smaller sarcoplasmic reticular Ca contents, intracellular Ca transients, L-type Ca , reverse mode Na⁺-Ca exchanger currents, lower protein expressions of sarcoplasmic reticulum ATPase, ryanodine receptor 2 (RyR2), but higher protein expressions of phosphorylated RyR2 at serine 2808 than the control and empagliflozin-treated DM rats. The incidence and frequency of Ca sparks, cytosolic and mitochondrial reactive oxygen species, and late Na⁺ current and Na⁺/hydrogen-exchanger currents were greater in the DM rats than in the control and empagliflozin-treated DM rats. Empagliflozin significantly changed Ca regulation, late Na⁺ and Na⁺/hydrogen-exchanger currents and electrophysiological characteristics in DM cardiomyopathy, which may contribute to its cardioprotective benefits in DM patients.</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>30987285</pmid><doi>10.3390/ijms20071680</doi><oa>free_for_read</oa></addata></record>
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source MDPI - Multidisciplinary Digital Publishing Institute; MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central
subjects Animals
Antidiabetics
Benzhydryl Compounds - therapeutic use
Blood
Body size
Body weight
Calcium - metabolism
Calcium homeostasis
Calcium ions
Cardiac muscle
Cardiomyopathy
Cell size
Diabetes mellitus
Diabetes Mellitus, Experimental - drug therapy
Diabetes Mellitus, Experimental - metabolism
EKG
Electrocardiography
Electrophysiology
Glucosides - therapeutic use
Heart
Homeostasis
Hypertension
Myocardium - metabolism
Myocytes
Myocytes, Cardiac - drug effects
Myocytes, Cardiac - metabolism
Oxidative stress
Potassium
Rats
Rodents
Ryanodine Receptor Calcium Release Channel - metabolism
Signal transduction
Sodium
Sodium - metabolism
Sodium-Calcium Exchanger - metabolism
Streptozocin
Ventricle
title Empagliflozin Attenuates Myocardial Sodium and Calcium Dysregulation and Reverses Cardiac Remodeling in Streptozotocin-Induced Diabetic Rats
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