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• W2024583929 startingPage "863" @default.
• W2024583929 abstract "Background: Furosemide, a loop diuretic inhibiting the renal tubular Na+,K+,2Cl- cotransporter, has been shown to decrease cytosolic Ca2+ concentration ([Ca2+]i) in platelets and erythrocytes. [Ca2+]i in erythrocytes is a function of Ca2+ permeable cation channels. Activation of those channels e.g. by energy depletion or oxidative stress leads to increase of [Ca2+]i, which in turn triggers eryptosis, a suicidal erythrocyte death characterized by cell membrane scrambling. The present study was performed to explore whether furosemide influences the cation channels and thus influences eryptosis. Methods: Cation channel activity was determined by whole-cell patch clamp, [Ca2+]i utilizing Fluo3 fluorescence and annexin V binding to estimate cell membrane scrambling with phosphatidylserine exposure. Results: A 45 min exposure to furosemide (10 and 100 µM) slightly, but significantly decreased cation channel activity and [Ca2+]i in human erythrocytes drawn from healthy individuals. ATP-depletion (> 3 hours, +37°C, 6 mM ionosine and 6 mM iodoacetic acid) enhanced the non-selective cation channel activity, increased [Ca2+]i and triggered cell membrane scrambling, effects significantly blunted by furosemide (10 – 100 µM). Oxidative stress by exposure to tert-butylhydroperoxide (0.1 –1 mM) similarly enhanced the non-selective cation channels activity, increased [Ca2+]i and triggered cell membrane scrambling, effects again significantly blunted by furosemide (10 – 100 µM). Conclusions: The present study shows for the first time that the loop diuretic furosemide applied at micromolar concentrations (10 – 100 µM) inhibits non-selective cation channel activity in and eryptosis of human erythrocytes." @default.
• W2024583929 created "2016-06-24" @default.
• W2024583929 creator A5045486238 @default.
• W2024583929 creator A5084208566 @default.
• W2024583929 date "2012-01-01" @default.
• W2024583929 modified "2023-09-27" @default.
• W2024583929 title "Inhibitory Effect of Furosemide on Non-Selective Voltage-Independent Cation Channels in Human Erythrocytes" @default.
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• W2024583929 doi "https://doi.org/10.1159/000341464" @default.
• W2024583929 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22907543" @default.
• W2024583929 hasPublicationYear "2012" @default.
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