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Dicoumarol Activates Ca-permeable Cation Channels Triggering Erythrocyte Cell Membrane Scrambling.

Authors :
Qadri, Syed M.
Kucherenko, Yuliya
Zelenak, Christine
Jilani, Kashif
Lang, Elisabeth
Lang, Florian
Source :
Cellular Physiology & Biochemistry (Karger AG); 2011, Vol. 28 Issue 5, p857-864, 8p
Publication Year :
2011

Abstract

Dicoumarol, a widely used anticoagulant, may cause anemia, which may result from enhanced erythrocyte loss due to bleeding or due to accelerated erythrocyte death. Erythrocytes may undergo suicidal death or eryptosis, characterized by cell shrinkage and phospholipid scrambling of the cell membrane. Eryptosis may be triggered by increase of cytosolic <superscript>2+</superscript>-activity ([Ca<superscript>2+</superscript>]<subscript>i</subscript>). The present study explored, whether dicoumarol induces eryptosis. [Ca<superscript>2+</superscript>]<subscript>i</subscript> was estimated from Fluo3-fluorescence, cation channel activity utilizing whole cell patch clamp, cell volume from forward scatter, phospholipid scrambling from annexin-V-binding, and hemolysis from haemoglobin release. Exposure of erythrocytes for 48 hours to dicoumarol (=10 μM) significantly increased [Ca<superscript>2+</superscript>]<subscript>i</subscript>, enhanced cation channel activity, decreased forward scatter, triggered annexin-V-binding and elicited hemolysis. Following exposure to 30 μM dicoumarol, annexin-V-binding affected approximately 15%, and hemolysis 2% of treated erythrocytes. The stimulation of annexin-V-binding by dicoumarol was abrogated in the nominal absence of <superscript>2+</superscript>. In conclusion, dicoumarol stimulates suicidal death of erythrocytes by stimulating Ca<superscript>2+</superscript> entry and subsequent triggering of <superscript>2+</superscript> dependent cell membrane scrambling. Copyright © 2011 S. Karger AG, Basel [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10158987
Volume :
28
Issue :
5
Database :
Complementary Index
Journal :
Cellular Physiology & Biochemistry (Karger AG)
Publication Type :
Academic Journal
Accession number :
69812138
Full Text :
https://doi.org/10.1159/000335800