L-carnitine protects cardiac damage by reducing oxidative stress and inflammatory response via inhibition of tumor necrosis factor-alpha and interleukin-1beta against isoproterenol-induced myocardial infarction

• Main Authors: Tushar Emran, Nowreen Islam Chowdhury, Manoneeta Sarker, Asim Kumar Bepari, Murad Hossain, G.M. Sayedur Rahman, Hasan Mahmud Reza
• Format: Article
• Language: English
• Published: Elsevier 2021-11-01
• Series: Biomedicine & Pharmacotherapy
• Subjects: Isoproterenol; L-carnitine; Oxidative stress; Inflammation; Cardiac fibrosis
• Online Access: http://www.sciencedirect.com/science/article/pii/S0753332221009239

Brief introduction: Myocardial infarction (MI) is a common manifestation of certain cardiac diseases where oxidative stress and fibrosis aggravate the condition markedly. Main objective of the study: Investigation of L-carnitine’s cardioprotective roles and mechanism of action in a rat model of MI. Methods: To develop a MI animal model, Isoproterenol (ISO) was administered in male Long Evans rats where animals were divided into five groups (six rats/group). The oxidative stress and antioxidant enzyme activities were determined by different biochemical tests. The real-time PCR was performed to determine the expression of TNF-α and Il-1β. Histopathological observations by hematoxylin-eosin and Masson trichrome were made to observe the tissue damage and fibrosis in heart and kidney. Significant findings from the study: The ISO-treated rats showed increased levels of troponin I and lipid peroxidation and lower antioxidant enzyme activity in heart and kidney tissues. The levels of TNF-α and IL-1β were also increased in ISO-rats. Co-administration of L-carnitine with ISO reversed all these parameters. The elevated levels of uric acid and creatinine kinase and ALP, AST and ALT activities in ISO-rats were also significantly reduced by L-carnitine administration. L-carnitine markedly decreased the infiltration of inflammatory cells and improved the tissue architecture in heart and kidney. Control animals did not show any appreciable response upon L-carnitine administration. Relevant contribution to knowledge: These results suggest that L-carnitine plays a defensive role against cardiac and renal damage in ISO-treated MI rat model via suppressing oxidative stress and increasing antioxidant enzyme functions through inhibition of TNF-α and IL-1β.