ABC | Volume 112, Nº2, February 2019

Short Editorial Cardiac Effects of Trimetazidine in Diabetic Rats Alfredo J. Mansur Instituto do Coração (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP – Brazil Short Editorial related to the article: The Effects of Trimetazidine on QT-interval Prolongation and Cardiac Hypertrophy in Diabetic Rats Mailing Address: Alfredo J. Mansur • Av. Dr. Eneas de Carvalho Aguiar, 44. Postal Code 05403-00, São Paulo, SP – Brazil E-mail: ajmansur@incor.usp.br Keywords DiabetesMellitus; Diabetic Cardiomyopathies; Hypertrophic, Left Ventricular/metabolismo; Oxidative Stress; Angina Pectoris/ metabolismo; Trimetazidine/therapeutic use. DOI: 10.5935/abc.20190012 1. Borghetti G, von Lewinski D, Eaton DM, Sourij H, Houser SR, Wallner M. Diabetic Cardiomyopathy: Current and Future Therapies. BeyondGlycemic Control. Front Physiol. 2018 Oct 30;9:1514. 2. Madamanchi NR, Runge MS. Redox signaling in cardiovascular health and disease. Free Radic Biol Med. 2013 Aug;61:473-501. 3. Dadson K, Hauck L, Billia F. Molecular mechanisms in cardiomyopathy. Clin Sci (Lond). 2017;131(13):1375-92. 4. Lewandowski ED. Metabolic mechanisms associated with antianginal therapy. Circ Res. 2000;86(5):487-9. 5. Balla C, Pavasini R, Ferrari R. Treatment of Angina: Where Are We? Cardiology. 2018;140(1):52-67. 6. Shaquiquzzaman M, Verma G, Marella A, Akhter M, Akhtar W, Khan MF, et al. Piperazine scaffold: A remarkable tool in generation of diverse pharmacological agents. Eur J Med Chem. 2015 Sep 18;102:487-529. 7. Ramezani-Aliakbari F, Badavi M, Dianat M, Mard SA, Ahangarpour A. The effects of Trimetazidine on QT-interval prolongation and cardiac hypertrophy in diabetic rats. Arq Bras Cardiol. 2019; 112(2):173-178. References This is an open-access article distributed under the terms of the Creative Commons Attribution License Diabetes mellitus may be associated with a specific form of cardiomyopathy independent of other comorbidities. Left ventricular hypertrophy is the main pathological change described in cardiomyopathy of patients with diabetes mellitus. Different mechanisms may be operative in the pathogenesis of the hypertrophy: metabolic derangements, inflammation and among other factors, oxidative stress. 1 Oxidative stress may lead to cellular damage by free radical‑induced oxidation of DNA, proteins and lipids. 2 Reactive oxygen species may lead to consequences in cardiomyocytes including hypertrophy, apoptosis and fibrosis; in this regard a cellular detoxification mechanism may be missing for attenuating severity of damage induced by some reactive oxygen species. 3 Hence, interventions that might be protective would be worth to be investigated, including drug therapy. Trimetazidine (1-[2,3,4-trimethoxybenzyl] piperazine dihydrochloride) 4 is one of the drugs that may be used in combination with other drugs for the treatment of patients with angina pectoris. 5 It is a piperazine derivative 6 characterized as a metabolic modulator 5 that reduces long-chain fatty acid (3-ketoactyl CoA thiolase) oxidation. 4 In this issue, 7 an experimental study of alloxan induced diabetes in Sprague-Dawley rats tested the hypothesis that the administration of trimetazidine might prevent pathologic changes induced in the heart of the studied animals, including QT interval, heart weight relative to body weight, myocardial contractility indices and antioxidant enzyme activities (superoxide dismutase, catalase and glutathione peroxidase). The authors found that the administration of trimetazidine reduced the modifications in the studied variables induced by diabetes in the rats. Thus, additional experimental findings were added to current knowledge about the interaction between diabetes, cardiomyopathy and drug therapy in experimental animals, rats in this specific study. In the event of progress in accumulating knowledge together with other studies, evidences may evolve to deserving clinical studies. 179