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      Resistance Training Regulates Cardiac Function through Modulation of miRNA-214

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          Abstract

          Aims: To determine the effects of resistance training (RT) on the expression of microRNA (miRNA)-214 and its target in sarcoplasmic reticulum Ca 2+-ATPase (SERCA2a), and on the morphological and mechanical properties of isolated left ventricular myocytes. Main methods: Male Wistar rats were divided into two groups ( n = 7/group): Control (CO) or trained (TR). The exercise-training protocol consisted of: 4 × 12 bouts, 5×/week during 8 weeks, with 80% of one repetition maximum. Key findings: RT increased the left ventricular myocyte width by 15% and volume by 12%, compared with control animals ( p < 0.05). The time to half relaxation and time to peak were 8.4% and 4.4% lower, respectively, in cells from TR group as compared to CO group ( p < 0.05). RT decreased miRNA-214 level by 18.5% while its target SERCA2a expression were 18.5% higher ( p < 0.05). Significance: Our findings showed that RT increases single left ventricular myocyte dimensions and also leads to faster cell contraction and relaxation. These mechanical adaptations may be related to the augmented expression of SERCA2a which, in turn, may be associated with the epigenetic modification of decreased miRNA-214 expression.

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          Most cited references 46

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          MicroRNA therapeutics for cardiovascular disease: opportunities and obstacles.

          In recent years, prominent roles for microRNAs (miRNAs) have been uncovered in several cardiovascular disorders. The ability to therapeutically manipulate miRNA expression and function through systemic or local delivery of miRNA inhibitors, referred to as antimiRs, has triggered enthusiasm for miRNAs as novel therapeutic targets. Here, we focus on the pharmacokinetic and pharmacodynamic properties of current antimiR designs and their relevance to cardiovascular indications, and evaluate the opportunities and obstacles associated with this new therapeutic modality.
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            Molecular distinction between physiological and pathological cardiac hypertrophy: experimental findings and therapeutic strategies.

            Cardiac hypertrophy can be defined as an increase in heart mass. Pathological cardiac hypertrophy (heart growth that occurs in settings of disease, e.g. hypertension) is a key risk factor for heart failure. Pathological hypertrophy is associated with increased interstitial fibrosis, cell death and cardiac dysfunction. In contrast, physiological cardiac hypertrophy (heart growth that occurs in response to chronic exercise training, i.e. the 'athlete's heart') is reversible and is characterized by normal cardiac morphology (i.e. no fibrosis or apoptosis) and normal or enhanced cardiac function. Given that there are clear functional, structural, metabolic and molecular differences between pathological and physiological hypertrophy, a key question in cardiovascular medicine is whether mechanisms responsible for enhancing function of the athlete's heart can be exploited to benefit patients with pathological hypertrophy and heart failure. This review summarizes key experimental findings that have contributed to our understanding of pathological and physiological heart growth. In particular, we focus on signaling pathways that play a causal role in the development of pathological and physiological hypertrophy. We discuss molecular mechanisms associated with features of cardiac hypertrophy, including protein synthesis, sarcomeric organization, fibrosis, cell death and energy metabolism and provide a summary of profiling studies that have examined genes, microRNAs and proteins that are differentially expressed in models of pathological and physiological hypertrophy. How gender and sex hormones affect cardiac hypertrophy is also discussed. Finally, we explore how knowledge of molecular mechanisms underlying pathological and physiological hypertrophy may influence therapeutic strategies for the treatment of cardiovascular disease and heart failure. 2010 Elsevier Inc. All rights reserved.
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              MicroRNA-214 protects the mouse heart from ischemic injury by controlling Ca²⁺ overload and cell death.

              Early reperfusion of ischemic cardiac tissue remains the most effective intervention for improving clinical outcome following myocardial infarction. However, abnormal increases in intracellular Ca²⁺ during myocardial reperfusion can cause cardiomyocyte death and consequent loss of cardiac function, referred to as ischemia/reperfusion (IR) injury. Therapeutic modulation of Ca²⁺ handling provides some cardioprotection against the paradoxical effects of restoring blood flow to the heart, highlighting the significance of Ca²⁺ overload to IR injury. Cardiac IR is also accompanied by dynamic changes in the expression of microRNAs (miRNAs); for example, miR-214 is upregulated during ischemic injury and heart failure, but its potential role in these processes is unknown. Here, we show that genetic deletion of miR-214 in mice causes loss of cardiac contractility, increased apoptosis, and excessive fibrosis in response to IR injury. The cardioprotective roles of miR-214 during IR injury were attributed to repression of the mRNA encoding sodium/calcium exchanger 1 (Ncx1), a key regulator of Ca²⁺ influx; and to repression of several downstream effectors of Ca²⁺ signaling that mediate cell death. These findings reveal a pivotal role for miR-214 as a regulator of cardiomyocyte Ca²⁺ homeostasis and survival during cardiac injury.
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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Int J Mol Sci
                Int J Mol Sci
                ijms
                International Journal of Molecular Sciences
                MDPI
                1422-0067
                26 March 2015
                April 2015
                : 16
                : 4
                : 6855-6867
                Affiliations
                [1 ]Laboratory of Biochemistry and Molecular Biology of the Exercise, School of Physical Education and Sport, University of Sao Paulo, Sao Paulo 05508-030, Brazil; E-Mails: stephanomelo@ 123456usp.br (S.F.S.M.); luizbozi@ 123456hotmail.com (L.H.M.B.)
                [2 ]Laboratory of Molecular Physiology, Health Sciences Center, Federal University of Espírito Santo, Vitória 29043-900, Brazil; E-Mail: barauna2@ 123456gmail.com
                [3 ]Department of Physical Education, Federal University of Viçosa, Viçosa, Minas Gerais 36570-900, Brazil; E-Mails: miguelefiufv@ 123456yahoo.com.br (M.A.C.J.); lucasriosufv@ 123456yahoo.com.br (L.R.D.); anatali@ 123456ufv.br (A.J.N.)
                Author notes
                [* ] Author to whom correspondence should be addressed; E-Mail: edilamar@ 123456usp.br ; Tel.: +55-11-3091-2118; Fax: +55-11-3813-5921.
                Article
                ijms-16-06855
                10.3390/ijms16046855
                4424992
                25822872
                © 2015 by the authors; licensee MDPI, Basel, Switzerland.

                This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/4.0/).

                Categories
                Article

                Molecular biology

                resistance training, cardiovascular, microrna, cardiomyocytes

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