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• W2011060369 endingPage "135" @default.
• W2011060369 startingPage "129" @default.
• W2011060369 abstract "Isolated heart cells are highly susceptible to the toxicity of catecholamine oxidation products, namely, to catecholamine-glutathione adducts. Although cellular uptake and/or efflux of these products may constitute a crucial step, the knowledge about the involvement of transporters is still very scarce. This work aimed to contribute to the characterization of membrane transport mechanisms, namely, extraneuronal monoamine transporter (EMT), the multidrug resistant protein 1 (MRP1), and P-glycoprotein (P-gp) in freshly isolated cardiomyocytes from adult rats. These transporters may be accountable for uptake and/or efflux of adrenaline and an adrenaline oxidation product, 5-(glutathion-S-yl)adrenaline, in cardiomyocyte suspensions. Our results showed that 5-(glutathion-S-yl)adrenaline efflux was mediated by MRP1. Additionally, we demonstrated that the adduct formation occurs within the cardiomyocytes, since EMT inhibition reduced the intracellular adduct levels. The classical uptake2 transport in rat myocardial cells was inhibited by the typical EMT inhibitor, corticosterone, and surprisingly was also inhibited by low concentrations of another drug, a well-known P-gp inhibitor, GF120918. The P-gp activity was absent in the cells since P-gp-mediated efflux of quinidine was not blocked by GF120918. In conclusion, this work showed that freshly isolated cardiomyocytes from adult rats constitute a good model for the study of catecholamines and catecholamines metabolites membrane transport. The cardiomyocytes maintain EMT and MRP1 fully active, and these transporters contribute to the formation and efflux of 5-(glutathion-S-yl)adrenaline. In the present experimental conditions, P-gp activity is absent in the isolated cardiomyocytes." @default.
• W2011060369 created "2016-06-24" @default.
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• W2011060369 date "2008-11-24" @default.
• W2011060369 modified "2023-09-28" @default.
• W2011060369 title "Cross-Functioning between the Extraneuronal Monoamine Transporter and Multidrug Resistance Protein 1 in the Uptake of Adrenaline and Export of 5-(Glutathion<i>-S-</i>yl)adrenaline in Rat Cardiomyocytes" @default.
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• W2011060369 doi "https://doi.org/10.1021/tx8002577" @default.
• W2011060369 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19053318" @default.
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