title: Omega-3 Fatty Acids Do Not Protect Against Arrhythmias in Acute Nonreperfused Myocardial Infarction Despite Some Antiarrhythmic Effects.
abstract: Ventricular arrhythmias are an important cause of mortality in the acute myocardial infarction (MI). To elucidate the effect of the omega-3 polyunsaturated fatty acids (PUFAs) on ventricular arrhythmias in acute nonreperfused MI, rats were fed with normal or eicosapentaenoic acid (EPA) or docosahexaenoic acid (DHA)-enriched diet for 3 weeks. Subsequently the rats were subjected to either MI induction or sham operation. ECG was recorded for 6 h after the operation and episodes of ventricular tachycardia/fibrillation (VT/VF) were identified. Six hours after MI epicardial monophasic action potentials (MAPs) were recorded, cardiomyocyte Ca(2+) handling was assessed and expression of proteins involved in Ca(2+) turnover was studied separately in non-infarcted left ventricle wall and infarct borderzone. EPA and DHA had no effect on occurrence of post-MI ventricular arrhythmias or mortality. Nevertheless, DHA but not EPA prevented Ca(2+) overload in LV cardiomiocytes and improved rate of Ca(2+) transient decay, protecting PMCA and SERCA function. Moreover, both EPA and DHA prevented MI-induced hyperphosphorylation of ryanodine receptors (RyRs) as well as dispersion of action potential duration (APD) in the left ventricular wall. In conclusion, EPA and DHA have no antiarrhythmic effect in the non-reperfused myocardial infarction in the rat, although these omega-3 PUFAs and DHA in particular exhibit several potential antiarrhythmic effects at the subcellular and tissue level, that is, prevent MI-induced abnormalities in Ca(2+) handling and APD dispersion. In this context further studies are needed to see if these potential antiarrhythmic effects could be utilized in the clinical setting. J. Cell. Biochem. 117: 2570-2582, 2016. © 2016 Wiley Periodicals, Inc.
authors.affiliation: Department of Clinical Physiology, Centre of Postgraduate Medical Education, Warsaw, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Mączewski
authors.affiliation: Department of Clinical Physiology, Centre of Postgraduate Medical Education, Warsaw, Poland.
authors.forename: Monika
authors.initials: M
authors.lastname: Duda
authors.affiliation: Department of Clinical Physiology, Centre of Postgraduate Medical Education, Warsaw, Poland.
authors.forename: Mariusz
authors.initials: M
authors.lastname: Marciszek
authors.affiliation: Department of Clinical Physiology, Centre of Postgraduate Medical Education, Warsaw, Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Kołodziejczyk
authors.affiliation: Laboratory of Molecular and Medical Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland.
authors.forename: Paweł
authors.initials: P
authors.lastname: Dobrzyń
authors.affiliation: Laboratory of Cell Signaling and Metabolic Disorders, Nencki Institute of Experimental Biology, Warsaw, Poland.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Dobrzyń
authors.affiliation: Department of Clinical Physiology, Centre of Postgraduate Medical Education, Warsaw, Poland. urszula.mackiewicz@cmkp.edu.pl.
authors.forename: Urszula
authors.initials: U
authors.lastname: Mackiewicz
mesh_terms: D000208:Acute Disease; D000818:Animals; D001145:Arrhythmias, Cardiac / Q000188:drug therapy* / Q000209:etiology / Q000473:pathology; D002478:Cells, Cultured; D004281:Docosahexaenoic Acids / Q000494:pharmacology*; D015118:Eicosapentaenoic Acid / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects*; D008297:Male; D009203:Myocardial Infarction / Q000150:complications*; D020011:Protective Agents / Q000494:pharmacology; D051381:Rats; D011921:Rats, Inbred WKY
chemical_list: D020011:Protective Agents; D004281:Docosahexaenoic Acids; D015118:Eicosapentaenoic Acid
keywords: ACTION POTENTIAL DISPERSION; Ca2+ HANDLING; MYOCARDIAL INFARCTION; OMEGA-3 POLYUNSATURATED FATTY ACIDS; VENTRICULAR ARRHYTHMIAS