Phlorhizin Protects against Erythrocyte Cell Membrane Scrambling
2011
Gatidis, Sergios | Meier, Anja | Jilani, Kashif | Lang, Elisabeth | Zelenak, Christine | Qadri, Syed M. | Lang, Florian
Phlorhizin interferes with glucose transport. Glucose depletion triggers suicidal erythrocyte death or eryptosis, characterized by cell shrinkage and cell membrane scrambling. Eryptosis is further triggered by oxidative stress. The present study explored whether phlorhizin influences eryptosis following glucose depletion or oxidative stress. Cell membrane scrambling was estimated from annexin binding, cell volume from forward scatter (FSC), and cytosolic Ca2+ concentration from Fluo-3 fluorescence. Phlorhizin (10-100 micromolar) added alone did not modify scrambling, FSC, or Fluo-3 fluorescence. Glucose depletion (48 h) significantly increased Fluo-3 fluorescence, decreased FSC, and increased annexin binding, effects in part significantly blunted by phlorhizin (annexin binding greater than 10 micromolar, FSC greater than 50 micromolar). Oxidative stress (30 min 0.3 mM tert-butylhydroperoxide) again significantly increased Fluo-3 fluorescence and triggered annexin binding, effects again in part significantly blunted by phlorhizin (Fluo-3 fluorescence greater than 50 micromolar, annexin-binding greater than 10 micromolar). Phlorhizin did not blunt the cell shrinkage induced by oxidative stress. The present observations disclose a novel effect of phlorhizin, that is, an influence on suicidal erythrocyte death following energy depletion and oxidative stress.
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