ArticleRevista da Associacao Medica Brasileira (1992)2025
Enoxaparin preserves cellular morphology and modulates mitophagy-associated Parkin-LC3 in acute ischemic rat myocardium.
Article in Revista da Associacao Medica Brasileira (1992), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveDespite the longstanding clinical use of low-molecular-weight heparins and their well-characterized mechanisms of action, their effects on mitophagy pathways in acute myocardial ischemia remain incompletely delineated. The aim of this study was to investigate the enoxaparin effect on cardiomyocyte morphology and the immunopositivity of mitophagy-associated Parkin-LC3 proteins in a rat model of acute myocardial ischemia.
methodsFemale Wistar albino rats (median weight: 400 g, minimum: 375 g-maximum: 415 g) were divided into sham (n=7), control (n=7), and treatment (n=7) groups. The control group received subcutaneous 0.9% saline (0.2 mL/kg) twice daily for 28 days, followed by the induction of myocardial ischemia. The treatment group was administered subcutaneous enoxaparin sodium (1 mg/kg) twice daily for the same duration before undergoing myocardial ischemia. Myocardial ischemia was induced by occluding the proximal left anterior descending coronary artery using a 6-0 polypropylene suture for 10 min. Morphometric calculations of cardiomyocytes (cell length and diameter) were performed using light microscopy. Immunohistochemical analysis was performed using anti-Parkin and anti-LC3 antibodies, and immunopositive cells were counted.
resultsStatistically significant differences were found between the groups (p<0.001). Post-hoc analysis revealed significant differences between the control and treatment groups based on cell length, cell diameter, Parkin, and LC3 values (p<0.001, p=0.001, p<0.001, and p=0.001, respectively).
conclusionThis study demonstrated that enoxaparin preserved cardiomyocyte morphology and reduced the number of Parkin-LC3 immunopositive cells in a model of induced acute ischemic injury in rat myocardium.
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