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Al Kury LT, Sydorenko V, Smail MMA, Qureshi MA, Shmygol A, Papandreou D, Singh J, Howarth FC. Calcium signaling in endocardial and epicardial ventricular myocytes from streptozotocin-induced diabetic rats. J Diabetes Investig 2021; 12:493-500. [PMID: 33112506 PMCID: PMC8015823 DOI: 10.1111/jdi.13451] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 10/08/2020] [Accepted: 10/22/2020] [Indexed: 12/16/2022] Open
Abstract
AIMS/INTRODUCTION Abnormalities in Ca2+ signaling have a key role in hemodynamic dysfunction in diabetic heart. The purpose of this study was to explore the effects of streptozotocin (STZ)-induced diabetes on Ca2+ signaling in epicardial (EPI) and endocardial (ENDO) cells of the left ventricle after 5-6 months of STZ injection. MATERIALS AND METHODS Whole-cell patch clamp was used to measure the L-type Ca2+ channel (LTCC) and Na+ /Ca2+ exchanger currents. Fluorescence photometry techniques were used to measure intracellular free Ca2+ concentration. RESULTS Although the LTCC current was not significantly altered, the amplitude of Ca2+ transients increased significantly in EPI-STZ and ENDO-STZ compared with controls. Time to peak LTCC current, time to peak Ca2+ transient, time to half decay of LTCC current and time to half decay of Ca2+ transients were not significantly changed in EPI-STZ and ENDO-STZ myocytes compared with controls. The Na+ /Ca2+ exchanger current was significantly smaller in EPI-STZ and in ENDO-STZ compared with controls. CONCLUSIONS STZ-induced diabetes resulted in an increase in amplitude of Ca2+ transients in EPI and ENDO myocytes that was independent of the LTCC current. Such an effect can be attributed, at least in part, to the dysfunction of the Na+ /Ca2+ exchanger. Additional studies are warranted to improve our understanding of the regional impact of diabetes on Ca2+ signaling, which will facilitate the discovery of new targeted treatments for diabetic cardiomyopathy.
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Affiliation(s)
- Lina T Al Kury
- Department of Health SciencesCollege of Natural and Health SciencesZayed UniversityAbu DhabiUnited Arab Emirates
| | - Vadym Sydorenko
- Department of Cellular MembranologyBogomoletz Institute of PhysiologyKievUkraine
| | - Manal MA Smail
- Department of PhysiologyCollege of Medicine and Health SciencesUAE UniversityAl AinUnited Arab Emirates
| | - Muhammad A Qureshi
- Department of PhysiologyCollege of Medicine and Health SciencesUAE UniversityAl AinUnited Arab Emirates
| | - Anatoly Shmygol
- Department of PhysiologyCollege of Medicine and Health SciencesUAE UniversityAl AinUnited Arab Emirates
| | - Dimitrios Papandreou
- Department of Health SciencesCollege of Natural and Health SciencesZayed UniversityAbu DhabiUnited Arab Emirates
| | - Jaipaul Singh
- School of Forensic and Applied SciencesUniversity of Central LancashirePrestonUK
| | - Frank Christopher Howarth
- Department of PhysiologyCollege of Medicine and Health SciencesUAE UniversityAl AinUnited Arab Emirates
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Howarth F, A. Smail M, Qureshi M, Shmygol A, Singh J, Al Kury L. Contraction and intracellular calcium transport in epicardial and endocardial ventricular myocytes from streptozotocin-induced diabetic rat. HAMDAN MEDICAL JOURNAL 2019. [DOI: 10.4103/hmj.hmj_32_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Smail MMA, Qureshi MA, Shmygol A, Oz M, Singh J, Sydorenko V, Arabi A, Howarth FC, Al Kury L. Regional effects of streptozotocin-induced diabetes on shortening and calcium transport in epicardial and endocardial myocytes from rat left ventricle. Physiol Rep 2017; 4:4/22/e13034. [PMID: 27884956 PMCID: PMC5357996 DOI: 10.14814/phy2.13034] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/17/2016] [Accepted: 10/17/2016] [Indexed: 11/24/2022] Open
Abstract
In the heart, the left ventricle pumps blood at higher pressure than the right ventricle. Within the left ventricle, the electromechanical properties of ventricular cardiac myocytes vary transmurally and this may be related to the gradients of stress and strain experienced in vivo across the ventricular wall. Diabetes is also associated with alterations in hemodynamic function. The aim of this study was to investigate shortening and Ca2+ transport in epicardial (EPI) and endocardial (ENDO) left ventricular myocytes in the streptozotocin (STZ)‐induced diabetic rat. Shortening, intracellular Ca2+ and L‐type Ca2+ current (ICa,L) were measured by video detection, fura‐2 microfluorimetry, and whole‐cell patch clamp techniques, respectively. Time to peak (TPK) shortening was prolonged to similar extents in ENDO and EPI myocytes from STZ‐treated rats compared to ENDO and EPI myocytes from controls. Time to half (THALF) relaxation of shortening was prolonged in ENDO myocytes from STZ‐treated rats compared to ENDO controls. TPK Ca2+ transient was prolonged in ENDO myocytes from STZ‐treated rats compared to ENDO controls. THALF decay of the Ca2+ transient was prolonged in ENDO myocytes from STZ‐treated rats compared to ENDO controls. Sarcoplasmic reticulum (SR) fractional release of Ca2+ was reduced in EPI myocytes from STZ‐treated rats compared to EPI controls. ICa,L activation, inactivation, and recovery from inactivation were not significantly altered in EPI and ENDO myocytes from STZ‐treated rats or controls. Regional differences in Ca2+ transport may partly underlie differences in ventricular myocyte shortening across the wall of the healthy and the STZ‐treated rat left ventricle.
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Affiliation(s)
- Manal M A Smail
- Department of Physiology, College of Medicine & Health Sciences, UAE University, Al Ain, UAE
| | - Muhammad A Qureshi
- Department of Physiology, College of Medicine & Health Sciences, UAE University, Al Ain, UAE
| | - Anatoliy Shmygol
- Department of Physiology, College of Medicine & Health Sciences, UAE University, Al Ain, UAE
| | - Murat Oz
- Department of Pharmacology, College of Medicine & Health Sciences, UAE University, Al Ain, UAE
| | - Jaipaul Singh
- School of Forensic & Applied Sciences, University of Central Lancashire, Preston, UK
| | - Vadym Sydorenko
- Department of Cellular Membranology, Bogomoletz Institute of Physiology, Kiev, Ukraine
| | - Alya Arabi
- College of Natural & Health Sciences, Zayed University, Abu Dhabi, UAE
| | - Frank C Howarth
- Department of Physiology, College of Medicine & Health Sciences, UAE University, Al Ain, UAE
| | - Lina Al Kury
- College of Natural & Health Sciences, Zayed University, Abu Dhabi, UAE
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da Silva E, Natali AJ, da Silva MF, Gomes GDJ, da Cunha DNQ, Toledo MM, Drummond FR, Ramos RMS, Dos Santos EC, Novaes RD, de Oliveira LL, Maldonado IRDSC. Swimming training attenuates the morphological reorganization of the myocardium and local inflammation in the left ventricle of growing rats with untreated experimental diabetes. Pathol Res Pract 2016; 212:325-34. [PMID: 26896925 DOI: 10.1016/j.prp.2016.02.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 12/19/2015] [Accepted: 02/01/2016] [Indexed: 01/27/2023]
Abstract
Diabetic cardiomyopathy is associated with cardiac remodeling, myocardial dysfunction, low-grade inflammation, and reduced cardiac adiponectin in patients with type 1 diabetes mellitus (T1DM). Alternatively, physical exercise is an important strategy for the management of diabetes. This study aimed to investigate the influence of low-intensity swimming training in cardiac cytokines, structural remodeling, and cardiomyocyte contractile dysfunction in growing rats with untreated experimental DM. Thirty-day-old male Wistar rats were divided into four groups (n=14, per group): sedentary control (SC), exercised control (EC), sedentary diabetic (SD), and exercised diabetic (ED). Diabetes was induced by streptozotocin (60 mg kg(-1), i.p.). Animals from exercised groups swam (5 days/week, 90 min/day, loading up to 5% body weight around the animal's chest) for 8 weeks. The left ventricle (LV) was removed for molecular, morphological, and cardiomyocyte mechanical analysis. Diabetic animals presented cardiac remodeling with myocardial histoarchitectural disorganization, fibrosis, and necrosis. The capillary density was lower in diabetic animals. LV cardiomyocytes from diabetic animals exhibited more prolonged time to the peak of contraction and time to half relaxation than those from control animals. The cardiac levels of interleukin 10, nitric oxide, and total and high molecular weight (HMW) adiponectin were significantly decreased in diabetic animals. Exercise training reduced the level of TNF-α, increased capillary density, and attenuated the histopathological parameters assessed in diabetic rats. In conclusion, the cardiac structural remodeling coexists with reduced levels of total and HMW adiponectin, inflammation, and cardiomyocyte contractility dysfunction in experimental DM. More important, low-intensity swimming training attenuates part of these pathological changes, indicating the beneficial role for exercise in untreated T1DM.
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Affiliation(s)
- Edson da Silva
- Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil; Department of Basic Sciences, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil.
| | - Antônio José Natali
- Department of Physical Education, Federal University of Viçosa, Viçosa, MG, Brazil
| | | | - Gilton de Jesus Gomes
- Department of Physical Education, Federal University of Viçosa, Viçosa, MG, Brazil; Department of Physical Education, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil
| | | | | | - Filipe Rios Drummond
- Department of Physical Education, Federal University of Viçosa, Viçosa, MG, Brazil
| | | | - Eliziária Cardoso Dos Santos
- Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil; Faculty of Medicine, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil
| | - Rômulo Dias Novaes
- Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil; Biomedical Sciences Institute, Federal University of Alfenas, MG, Brazil
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Erken HA, Erken G, Colak R, Genç O. Exercise and DHA prevent the negative effects of hypoxia on EEG and nerve conduction velocity. High Alt Med Biol 2014; 14:360-6. [PMID: 24377343 DOI: 10.1089/ham.2012.1125] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
It is known that hypoxia has a negative effect on nervous system functions, but exercise and DHA (docosahexaenoic acid) have positive effect. In this study, it was investigated whether exercise and/or DHA can prevent the effects of hypoxia on EEG and nerve conduction velocity (NCV). 35 adult Wistar albino male rats were divided into five groups (n=7): control (C), hypoxia (H), hypoxia and exercise (HE), hypoxia and DHA (HD), and hypoxia and exercise and DHA (HED) groups. During the 28-day hypoxia exposure, the HE and HED groups of rats were exercised (0% incline, 30 m/min speed, 20 min/day, 5 days a week). In addition, DHA (36 mg/kg/day) was given by oral gavage to rats in the HD and HED groups. While EEG records were taken before and after the experimental period, NCV records were taken after the experimental period from anesthetized rats. Data were analyzed by paired t-test, one-way ANOVA, and post hoc Tukey test. In this study, it was shown that exposure to hypoxia decreased theta activity and NCV, but exercise and DHA reduced the delta activity, while theta, alpha, beta activities, and NCV were increased. These results have shown that the effects of hypoxia exposure on EEG and NCV can be prevented by exercise and/or DHA.
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Affiliation(s)
- Haydar Ali Erken
- 1 Department of Physiology, Faculty of Medicine, Balikesir University , Balikesir, Turkey
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Abstract
Diabetic cardiomyopathy (DCM) is defined as cardiac disease independent of vascular complications during diabetes. The number of new cases of DCM is rising at epidemic rates in proportion to newly diagnosed cases of diabetes mellitus (DM) throughout the world. DCM is a heart failure syndrome found in diabetic patients that is characterized by left ventricular hypertrophy and reduced diastolic function, with or without concurrent systolic dysfunction, occurring in the absence of hypertension and coronary artery disease. DCM and other diabetic complications are caused in part by elevations in blood glucose and lipids, characteristic of DM. Although there are pathological consequences to hyperglycemia and hyperlipidemia, the combination of the two metabolic abnormalities potentiates the severity of diabetic complications. A natural competition exists between glucose and fatty acid metabolism in the heart that is regulated by allosteric and feedback control and transcriptional modulation of key limiting enzymes. Inhibition of these glycolytic enzymes not only controls flux of substrate through the glycolytic pathway, but also leads to the diversion of glycolytic intermediate substrate through pathological pathways, which mediate the onset of diabetic complications. The present review describes the limiting steps involved in the development of these pathological pathways and the factors involved in the regulation of these limiting steps. Additionally, therapeutic options with demonstrated or postulated effects on DCM are described.
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Affiliation(s)
- Michael Isfort
- The Ohio State University College of Medicine, Columbus, OH, USA
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Silva E, Natali AJ, Silva MF, Gomes GJ, Cunha DN, Ramos RM, Toledo MM, Drummond FR, Belfort FG, Novaes RD, Maldonado IR. Ventricular remodeling in growing rats with experimental diabetes: The impact of swimming training. Pathol Res Pract 2013; 209:618-26. [DOI: 10.1016/j.prp.2013.06.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 05/31/2013] [Accepted: 06/25/2013] [Indexed: 01/27/2023]
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Salem KA, Qureshi MA, Sydorenko V, Parekh K, Jayaprakash P, Iqbal T, Singh J, Oz M, Adrian TE, Howarth FC. Effects of exercise training on excitation-contraction coupling and related mRNA expression in hearts of Goto-Kakizaki type 2 diabetic rats. Mol Cell Biochem 2013; 380:83-96. [PMID: 23620341 DOI: 10.1007/s11010-013-1662-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 04/17/2013] [Indexed: 10/26/2022]
Abstract
Although, several novel forms of intervention aiming at newly identified therapeutic targets are currently being developed for diabetes mellitus (DM), it is well established that physical exercise continues to be one of the most valuable forms of non-pharmacological therapy. The aim of the study was to investigate the effects of exercise training on excitation-contraction coupling and related gene expression in the Goto-Kakizaki (GK) type 2 diabetic rat heart and whether exercise is able to reverse diabetes-induced changes in excitation-contraction coupling and gene expression. Experiments were performed in GK and control rats aged 10-11 months following 2-3 months of treadmill exercise training. Shortening, [Ca(2+)]i and L-type Ca(2+) current were measured in ventricular myocytes with video edge detection, fluorescence photometry and whole cell patch clamp techniques, respectively. Expression of mRNA was assessed in ventricular muscle with real-time RT-PCR. Amplitude of shortening, Ca(2+) transients and L-type Ca(2+) current were not significantly altered in ventricular myocytes from GK sedentary compared to control sedentary rats or by exercise training. Expression of mRNA encoding Tpm2, Gja4, Atp1b1, Cacna1g, Cacnb2, Hcn2, Kcna3 and Kcne1 were up-regulated and Gja1, Kcnj2 and Kcnk3 were down-regulated in hearts of sedentary GK rats compared to sedentary controls. Gja1, Cav3 and Kcnk3 were up-regulated and Hcn2 was down-regulated in hearts of exercise trained GK compared to sedentary GK controls. Ventricular myocyte shortening and Ca(2+) transport were generally well preserved despite alterations in the profile of expression of mRNA encoding a variety of cardiac muscle proteins in the adult exercise trained GK diabetic rat heart.
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Affiliation(s)
- K A Salem
- Department of Pharmacology, College of Medicine & Health Sciences, United Arab Emirates University, Al Ain, UAE
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A model of poorly controlled type 1 Diabetes Mellitus and its treatment with aerobic exercise training. DIABETES & METABOLISM 2013; 39:226-35. [PMID: 23522732 DOI: 10.1016/j.diabet.2013.02.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 01/31/2013] [Accepted: 02/04/2013] [Indexed: 10/27/2022]
Abstract
BACKGROUND Modern exogenous insulin therapy can improve the quality of life of Type 1 Diabetic Mellitus (T1DM) patients, although maintenance of normal glycaemic levels is often a challenge given the variety of factors that alter it. A number of studies have examined the effect of exercise in T1DM; however, the majority of experimental studies have utilized diabetic rodents with severe hyperglycaemia. Given that T1DM patients are likely to refrain from hyperglycaemia, studies examining the effects of regular exercise in which blood glucose is poorly controlled would better represent the T1DM population. METHODS The current study examined the ability of a ten-week aerobic exercise training program to modify markers of cardiovascular function and bone health in STZ-induced diabetic rodents maintained in the 9-15 mM glycaemic range through insulin therapy. RESULTS Moderate hyperglycaemia, when prolonged, leads to significant changes in cardiac structure, bone health, and glucose handling capacity. Ten weeks of exercise was able to alleviate many of these deleterious events as no significant cardiovascular functional alterations were evident except a reduction in resting heart rate and an increase in stroke volume index. Further, despite changes in cardiac dimensions, exercise was able to elevate cardiac output index and increase the E/A ratio of exercising diabetic animals which would be indicative of improvements of cardiac function. CONCLUSIONS Together, this study demonstrates that despite moderate hyperglycaemia, the combined role of a ten-week exercise training program coupled with insulin therapy is able to alleviate many of the well-known complications associated with diabetes progression.
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Le Douairon Lahaye S, Gratas-Delamarche A, Malardé L, Zguira S, Vincent S, Lemoine Morel S, Carré F, Rannou Bekono F. Combined insulin treatment and intense exercise training improved basal cardiac function and Ca2+-cycling proteins expression in type 1 diabetic rats. Appl Physiol Nutr Metab 2012; 37:53-62. [DOI: 10.1139/h11-127] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study investigated the effects of 8 weeks of intense exercise training combined with insulin treatment on the Ca2+-cycling protein complex expression and their functional consequences on cardiac function in type 1 diabetic rat hearts. Diabetic Wistar rats were randomly assigned into the following groups: received no treatment, insulin-treated diabetic, trained diabetic, and trained insulin-treated diabetic. A control group was also included. Insulin treatment and (or) treadmill intense exercise training were conducted over 8 weeks. Basal cardiac function was evaluated by Langendorff technique. Cardiac expression of the main Ca2+-cycling proteins (RyR2, FKBP 12.6, SERCA2, PLB, NCX1) was assessed by Western blot. Diabetes altered basal cardiac function (±dP/dt) and decrease the expression of the main Ca2+-cycling proteins expression: RyR2, SERCA2, and NCX1 (p < 0.05). Whereas combined treatment was not able to normalize –dP/dt, it succeeded to normalize +dP/dt of diabetic rats (p < 0.05). Moreover, both insulin and intense exercise training, applied solely, increased the expression of the Ca2+-cycling proteins: RyR2, SERCA2, PLB. and NCX1 (p < 0.05). But this effect was higher when the 2 treatments were combined. These data are the first to show that combined insulin treatment and intense exercise training during diabetes synergistically act on the expression of the main Ca2+-cycling proteins, providing insights into mechanisms by which the dual treatment during diabetes improves cardiac function.
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Affiliation(s)
- Solène Le Douairon Lahaye
- Laboratory Movement and health Sciences, UFR APS, University of Rennes 2 Avenue Charles Tillon, 35044 Rennes cedex, France
| | - Arlette Gratas-Delamarche
- Laboratory Movement and health Sciences, UFR APS, University of Rennes 2 Avenue Charles Tillon, 35044 Rennes cedex, France
| | - Ludivine Malardé
- Laboratory Movement and health Sciences, UFR APS, University of Rennes 2 Avenue Charles Tillon, 35044 Rennes cedex, France
| | - Sami Zguira
- Laboratory Movement and health Sciences, UFR APS, University of Rennes 2 Avenue Charles Tillon, 35044 Rennes cedex, France
| | - Sophie Vincent
- Laboratory Movement and health Sciences, UFR APS, University of Rennes 2 Avenue Charles Tillon, 35044 Rennes cedex, France
| | - Sophie Lemoine Morel
- Laboratory Movement and health Sciences, UFR APS, University of Rennes 2 Avenue Charles Tillon, 35044 Rennes cedex, France
| | - François Carré
- INSERM, U642; University of Rennes 1, LTSI; INSERM – CIC-IT 804; CHU Rennes, Department of Biology and Sports Medicine service of functional explorations, Rennes, France
| | - Françoise Rannou Bekono
- Laboratory Movement and health Sciences, UFR APS, University of Rennes 2 Avenue Charles Tillon, 35044 Rennes cedex, France
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