Triggering of suicidal erythrocyte death by uremic toxin indoxyl sulfate

BMC Nephrology

Florian Lang¹  Jakob Voelkl¹  Majed Abed¹  Mohamed Siyabeldin E Ahmed¹ 

[1] Department of Physiology, University of Tuebingen, Gmelinstraße 5, 72076 Tuebingen, Germany

关键词: Eryptosis;    Cell volume;    Calcium;    Indoxyl sulfate;    Phosphatidylserine;   

Others  :  1082795
DOI  :  10.1186/1471-2369-14-244

 received in 2013-05-22, accepted in 2013-09-25,  发布年份 2013

【 摘 要 】

Background

Anemia in end stage renal disease is attributed to impaired erythrocyte formation due to erythropoietin and iron deficiency. On the other hand, end stage renal disease enhances eryptosis, the suicidal erythrocyte death characterized by cell shrinkage and phosphatidylserine-exposure at the erythrocyte surface. Eryptosis may be triggered by increase of cytosolic Ca²⁺-activity ([Ca²⁺]_i) and by ceramide, which sensitizes erythrocytes to [Ca²⁺]_i. Mechanisms triggering eryptosis in endstage renal disease remained enigmatic. The present study explored the effect of indoxyl sulfate, an uremic toxin accumulated in blood of patients with chronic kidney disease.

Methods

Cell volume was estimated from forward scatter, phosphatidylserine-exposure from annexin V binding, ceramide abundance by specific antibodies, hemolysis from hemoglobin release, and [Ca²⁺]_i from Fluo3-fluorescence.

Results

A 48 hours exposure to indoxyl sulfate significantly increased [Ca²⁺]_i (≥ 300 μM), significantly decreased forward scatter (≥ 300 μM) and significantly increased annexin-V-binding (≥ 50 μM). Indoxyl sulfate (150 μM) induced annexin-V-binding was virtually abolished in the nominal absence of extracellular Ca²⁺. Indoxyl sulfate (150 μM) further enhanced ceramide abundance.

Conclusion

Indoxyl sulfate stimulates suicidal erythrocyte death or eryptosis, an effect in large part due to stimulation of extracellular Ca²⁺entry with subsequent stimulation of cell shrinkage and cell membrane scrambling.

【 授权许可】

   
2013 Ahmed et al.; licensee BioMed Central Ltd.

【 图 表 】

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