Acute myocardial infarction is a major cause of death all over the world. Irisin is a novel myokine released after exercise. This work aimed to study the correlation between the serum irisin level and the severity of the acute myocardial infarction in the exercise-trained rats.
Forty-eight male rats were classified into four groups (12 for each): group I, control sedentary (C); group II, exercise-trained (EX) (swimming for 8 weeks); group III, isoprenaline-induced infarct (MI); and group IV, exercise-trained infarct (EX-MI) (swimming for 8 weeks followed by isoprenaline-induced infarction). ECG was recorded at start and end of the study, before and after induction of infarction. The serum level of irisin, lipid peroxidation [malondialdehyde (MDA)], total antioxidant status (TAS), creatine phosphokinase-MB (CK-MB), and troponin I was determined. The hearts were excised for histopathology and immunohistochemistry for caspase-3.
The infarct rats showed significant prolongation in QTc interval and elevation in the ST segment as well as significant elevation of serum CK-MB, troponin I, and MDA, whereas TAS and serum irisin level were significantly decreased. With exercise, we observed a high positive correlation between the serum irisin and QRS duration (+0.643), amplitude (+0.860), and TAS (+0.887). In addition, there was a high negative correlation between the serum irisin and ST elevation (−0.865), QTc (−0.886), CK-MB (−0.891), troponin (−0.882), and MDA (−0.868). This was confirmed by the negative correlation between serum irisin and both collagen deposition and caspase-3 expression (–0.823 and –0.822, respectively).
We recommend regular exercise or taking recombinant irisin as a supplement to protect at-risk individuals against acute myocardial infarction.
The Physiology Department and Medical Experimental Research Center of Mansoura University are acknowledged for their significant contribution to the experimental part of the study.
Author contribution: Shereen M. Samir, Shaimaa M. Bashar, and Mohamed Z. Boraie designed and performed research, wrote the paper, and analyzed the data.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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