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1

Department of Physiology, University of Tuebingen, Gmelinstr. 5, Tuebingen 72076, Germany

2

Zentrum für Klinische Transfusionsmedizin, Otfried-Müller-Straße 4-1, Tuebingen 72076, Germany





*

Author to whom correspondence should be addressed.



Abstract The antidepressant fluoxetine inhibits ceramide producing acid sphingomyelinase. Ceramide is in turn known to trigger eryptosis the suicidal death of erythrocytes characterized by cell shrinkage and exposure of phosphatidylserine at the erythrocyte surface. Ceramide is effective through sensitizing the erythrocytes to the pro-eryptotic effect of increased cytosolic Ca2+ activity Ca2+i. In nucleated cells, fluoxetine could either inhibit or stimulate suicidal death or apoptosis. The present study tested whether fluoxetine influences eryptosis. To this end cell volume was estimated from forward scatter, phosphatidylserine exposure from annexin V binding, hemolysis from hemoglobin release and Ca2+i from Fluo-3 fluorescence intensity. As a result, a 48 h exposure of erythrocytes to fluoxetine ≥25 µM significantly decreased forward scatter, increased annexin V binding and enhanced Ca2+i. The effect on annexin V binding was significantly blunted, but not abolished, in the absence of extracellular Ca2+. In conclusion, fluoxetine stimulates eryptosis, an effect at least in part due to increase of cytosolic Ca2+ activity. View Full-Text

Keywords: phosphatidylserine; fluoxetine; calcium; cell volume; eryptosis phosphatidylserine; fluoxetine; calcium; cell volume; eryptosis





Author: Kashif Jilani 1, Sigrid Enkel 2, Rosi Bissinger 1, Ahmad Almilaji 1, Majed Abed 1 and Florian Lang 1,*

Source: http://mdpi.com/



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