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Article Abstract
Background: Arsenic poisoning is a serious medical condition caused by consumption of contaminated food and water. Cardiovascular toxicity is one of the important risk factors associated with arsenic toxicity.
Aim: To elucidate efficacy and possible mechanism of action of naringin in arsenic-induced cardiac toxicity in laboratory rats.
Materials And Methods: Arsenic toxicity was induced in Sprague-Dawley rats by sodium arsenite (5 mg/kg, p.o., 28 days). Rats were either concomitantly treated with vehicle (5 mL/kg, p.o.) or naringin (20, 40 and 80 mg/kg, p.o.) for 28 days. Chronic administration of sodium arsenite caused significant alterations in electrocardiographic, hemodynamic and left ventricle contractile functions.
Results: Treatment with naringin (40 and 80 mg/kg, p.o.) significantly restored (p < 0.05) these altered myocardial functions. Administration of naringin (40 and 80 mg/kg, p.o.) significantly inhibited (p < 0.05) arsenite-induced increased cardiac markers (LDH, CK-MB, AST, ALT, and ALP) and altered lipid metabolism (total cholesterol, triglyceride, LDL, HDL, and VLDL). The elevated level of heart oxido-nitrosative stress and decreased cardiac Na-K-ATPase level after arsenite administration was significantly attenuated (p < 0.05) by naringin (40 and 80 mg/kg, p.o.) treatment. Naringin also significantly increased (p < 0.05) myocardial mitochondrial enzymes (I-IV) activity. Arsenite-induced alteration in heart Nrf-2, HO-1, Smad-3, and TGF-β mRNA expression were significantly restored (p < 0.05) by naringin (40 and 80 mg/kg) treatment. Treatment with naringin (40 and 80 mg/kg) significantly inhibited (p < 0.05) arsenite-induce apoptosis revealed by flow cytometric analysis. Naringin administration reduced histopathological aberrations (measured using transmission electron microscopy) induced by sodium arsenite.
Conclusion: The results of present investigation suggest that naringin ameliorates arsenite-induced cardiotoxicity via modulation of TGF-β/Smad-3 and Nrf-2/HO-1 pathways along with a reduction in myocardial apoptosis.
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| http://dx.doi.org/10.1016/j.cbi.2016.05.015 | DOI Listing |
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