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Oleic Acid Prevents Isoprenaline-Induced Cardiac Injury: Effects on Cellular Oxidative Stress, Inflammation and Histopathological Alterations

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Abstract

The present study was designed to assess the cardio-protective role of oleic acid in myocardial injury (MI) induced by intra-peritoneal injection of isoprenaline (ISO) in rats for 2 consecutive days. Oleic acid (OA) was administered orally (@ 5 mg/kg b.wt and 10 mg/kg b.wt) for 21 days before inducing MI. Pre-exposure to OA at higher dose significantly improved the HW/BW ratio, myocardial infarct size, lipid profiles (total cholesterol, HDL-C) and cardiac injury biomarkers (LDH, CK-MB, cardiac troponin-I, MMP-9), thus suggesting its cardio-protective role. The ameliorative potential of the higher dose of OA was further substantiated by its ability to reduce the cardiac oxidative stress as evidenced by significant decrease in lipid peroxidation coupled with increase in superoxide dismutase activity and reduced glutathione level. Significant decrease in heart rate as well as increase in RR and QT intervals in oleic acid pre-exposed rats were also observed. OA pre-treatment also reduced the histopathological alterations seen in myocardial injury group rats. The mRNA expression of cardiac UCP-2 gene, a regulator of reactive oxygen species (ROS) generation, was significantly increased in oleic acid pre-exposure group compared to the ISO-induced myocardial injury group. Thus increase in expression of UCP-2 gene in cardiac tissue seems to be one of the protective measures against myocardial injury. Based on the above findings, it may be inferred that oleic acid possesses promising cardio-protective potential against myocardial injury due to its anti-oxidative property and ability to modulate cardiac metabolic processes.

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Acknowledgements

Authors acknowledge the financial assistance received under from “Strengthening and Development” grant of higher agricultural education programme” of Indian Council of Agricultural Research (ICAR), New Delhi. Use of Laboratory facilities established under “Nice Area of Excellence Programme of ICAR” in Department of Pharmacology and Toxicology of the Institute are also duely acknowledged.

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All the experimental studies were undertaken after approval of the Institutional Animal Ethics Committee (IAEC/17/13 vide letter no 115/IAEC/17, dated 26-07-2017), DUVASU, Mathura as per the guidelines of the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA).

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12012_2019_9531_MOESM1_ESM.tif

Supplementary material 1 (TIFF 2893 kb) Fig. S1: Representative electrocardiogram (ECG) tracings from control (A), ISO (B), OA-5 (C), OA-10 (D), OA-5 + ISO (E) and OA-10 + ISO (F) groups.

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Singh, P.K., Gari, M., Choudhury, S. et al. Oleic Acid Prevents Isoprenaline-Induced Cardiac Injury: Effects on Cellular Oxidative Stress, Inflammation and Histopathological Alterations. Cardiovasc Toxicol 20, 28–48 (2020). https://doi.org/10.1007/s12012-019-09531-y

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