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Sodium selenite as modulator of red cell shape
Biochimica Et Biophysica Acta
|April 20, 1994
Summary
Sodium selenite rapidly oxidizes glutathione and protein thiols in human red blood cells (RBCs) under ATP depletion. It also inhibits RBC shape change and phosphoinositide dephosphorylation, suggesting a role in cell membrane dynamics.
Area of Science:
- Cell Biology
- Biochemistry
- Hematology
Background:
- Human red blood cells (RBCs) undergo shape changes influenced by metabolic conditions.
- Phosphoinositide metabolism plays a role in regulating cell membrane structure and function.
- Oxidative stress can impact RBC morphology and integrity.
Purpose of the Study:
- To investigate the effects of sodium selenite on human RBCs under conditions of ATP depletion.
- To explore the relationship between selenite-induced oxidative changes and RBC shape transformation.
- To examine the impact of selenite on phosphoinositide metabolism in RBCs.
Main Methods:
- Incubation of human RBCs with sodium selenite under ATP-depleted conditions.
- Measurement of glutathione and protein sulfhydryl group oxidation.
- Assessment of discocyte-echinocyte shape transformation.
- Analysis of phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol 4-monophosphate dephosphorylation.
Main Results:
- Sodium selenite induced rapid oxidation of glutathione and protein sulfhydryl groups in RBCs.
- Selenite inhibited the discocyte-echinocyte shape transformation, halting it before completion.
- Selenite reduced the dephosphorylation of phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol 4-monophosphate.
Conclusions:
- The findings support a mechanism for RBC shape change involving phosphoinositide metabolism.
- Results are compatible with the bilayer-couple hypothesis for membrane shape determination.
- Selenite's effects highlight its potential to modulate RBC membrane dynamics through oxidative and metabolic pathways.