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Gramicidin D and dithiothreitol effects on erythrocyte exovesiculation
Nuno C Santos1, J Martins-Silva, Carlota Saldanha
1Instituto de Biopatologia Química and Unidade de Biopatologia Vascular - Instituto de Medicina Molecular, Faculdade de Medicina de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisboa, Portugal.
Cell Biochemistry and Biophysics
|October 26, 2005
Summary
Researchers developed a fluorescent probe method to study erythrocyte exovesiculation. Gramicidin D and dithiothreitol significantly altered red blood cell membrane composition and fluidity.
Area of Science:
- Biochemistry
- Cell Biology
- Membrane Biophysics
Background:
- Erythrocyte exovesiculation is a process involving the release of membrane vesicles.
- Understanding factors influencing exovesiculation is crucial for cell membrane research.
- Fluorescent probes offer a method for simultaneous vesicle induction and labeling.
Purpose of the Study:
- To investigate the effects of gramicidin D and dithiothreitol on human erythrocyte exovesiculation.
- To analyze changes in lipid composition and membrane fluidity during this process.
- To explore the role of lipid rafts and transbilayer lipid reorientation.
Main Methods:
- Utilized fluorescent probes like diphenylhexatriene, trimethylamino-diphenylhexatriene, and heptadecyl-hydroxycoumarin (C17-HC).
- Induced erythrocyte exovesiculation and simultaneously labeled released vesicles.
- Quantified cholesterol and phospholipid release and measured membrane fluidity.
Main Results:
- Gramicidin D and dithiothreitol induced significant release of cholesterol and phospholipids.
- These agents drastically decreased the phospholipid/cholesterol ratio in vesicles.
- Dithiothreitol treatment did not lead to an expected decrease in membrane fluidity.
Conclusions:
- Gramicidin D and dithiothreitol impact erythrocyte membrane composition and vesiculation.
- Observed effects may involve lipid rafts and transbilayer lipid reorientation.
- Cholesterol-dependent inactivation of gramicidin channels is suggested.
