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Ethanol inhibition of granulocyte adherence
Abstract:
Ethanol inhibits granulocyte adherence (GA) in whole blood. To determine the mechanism, GA was measured by the nylon fiber assay. In vitro addition of 300 mg/dl ethanol to whole blood caused a 28.1% decrease of GA compared with the control value (p less than 0.009) but did not affect GA of pure PMNs suspended in plasma or in HBSS. Similarly, GA measured in whole blood from intoxicated rabbits fell 48.8% from preintoxication values, but adherence of isolated postintoxication PMNs suspended in postintoxication plasma was not inhibited. Therefore, inhibition of GA by ethanol requires the presence of other cellular components of whole blood. To determine which cell(s) mediate the inhibition, PMNs were suspended with isolated blood components: platelet-rich and platelet-poor plasma, with and without the addition of mononuclear leukocytes and RBCs. Although the reconstitution of whole blood from its components allowed alcohol-induced inhibition of GA (decrease of 32.9%), none of the incomplete blood component mixtures demonstrated this effect. It was concluded that inhibition of GA by ethanol is mediated by an interaction between the components of whole blood.
Insights
Ethanol significantly reduces granulocyte adherence (GA) in whole blood by interacting with multiple blood components. This effect requires the presence of all cellular elements, not just pure neutrophils.
Area of Science:
- Immunology
- Pharmacology
- Hematology
Background:
- Ethanol is known to affect various physiological processes.
- Granulocyte adherence (GA) is a critical function of immune cells.
- The precise mechanism by which ethanol impacts GA remains unclear.
Purpose of the Study:
- To investigate the mechanism behind ethanol-induced inhibition of granulocyte adherence (GA).
- To determine which blood components are necessary for ethanol to inhibit GA.
Main Methods:
- Granulocyte adherence (GA) was measured using the nylon fiber assay.
- Experiments involved in vitro addition of ethanol to whole blood and isolated blood components.
- Studies were conducted in both human and rabbit models.
Main Results:
- In vitro ethanol (300 mg/dl) decreased GA in whole blood by 28.1% (p<0.009).
- Ethanol did not affect GA of pure neutrophils in plasma or HBSS.
- Whole blood GA in intoxicated rabbits decreased by 48.8%, but isolated neutrophil adherence in post-intoxication plasma was unaffected.
Conclusions:
- Ethanol's inhibition of GA necessitates the presence of other cellular components within whole blood.
- Reconstitution experiments showed that ethanol-induced GA inhibition only occurred when all blood components were present.
- The findings suggest an interaction between blood components mediates ethanol's effect on GA.