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Ethanol and erythrocyte membrane interaction: a hemorheologic perspective
R Mesquita1, M I Gonçalves, S Dias
1Instituto de Bioquímica, Faculdade de Medicina de Lisboa, Portugal. rmesquit@fml.fm.ul.pt
Clinical Hemorheology and Microcirculation
|December 22, 1999
Summary
Ethanol affects red blood cell aggregation at high concentrations (67 mM), increasing plasma osmolality. This finding may influence treatments for conditions like alcoholic coma.
Area of Science:
- Biochemistry
- Hematology
- Toxicology
Background:
- Ethanol is known to interact with erythrocyte membranes, causing structural and functional changes.
- Understanding these interactions is crucial for managing ethanol toxicity and related conditions.
Purpose of the Study:
- To investigate the in vitro effects of varying ethanol concentrations on erythrocyte hemorheologic properties.
- To determine specific ethanol concentrations that alter erythrocyte aggregation and membrane fluidity.
Main Methods:
- Blood samples from 21 male donors were incubated with increasing ethanol concentrations.
- Measured parameters included erythrocyte aggregation, hemoglobin derivatives, hematocrit, plasma osmolality, and erythrocyte membrane fluidity.
- Fluorescence polarization probes (TMA-DPH and DPH) were used to assess membrane fluidity.
Main Results:
- A significant increase in plasma osmolality was observed at 45 mM ethanol (0.352 Osm/kg H2O vs 0.310 Osm/kg H2O; p < 0.001).
- At 67 mM ethanol, erythrocyte aggregation decreased (11.03 vs 12.81; p < 0.05) and plasma osmolality increased (0.380 Osm/kg H2O vs 0.310 Osm/kg H2O; p < 0.001).
Conclusions:
- Ethanol significantly alters erythrocyte aggregation only at a concentration of 67 mM.
- These findings suggest potential implications for therapeutic strategies in managing ethanol-related emergencies, such as alcoholic coma.