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Alcohol and endogenous nitric oxide in hepatic microcirculation
1First Department of Medicine, Osaka University Medical School, Yamadaoka, Osaka, Japan.
Alcohol and Alcoholism (Oxford, Oxfordshire). Supplement
|January 1, 1994
Summary
Ethanol increases portal pressure in the liver. Endogenous nitric oxide (NO) acts as a vasodilator, counteracting ethanol
Area of Science:
- Pharmacology
- Hepatology
- Physiology
Background:
- Ethanol consumption can affect hepatic vascular tone.
- The role of endogenous nitric oxide (NO) in ethanol's effects on liver circulation is not fully understood.
Purpose of the Study:
- To investigate the role of endogenous nitric oxide in regulating hepatic vascular tone during ethanol administration.
- To determine if NO can mitigate ethanol-induced changes in liver circulation.
Main Methods:
- Utilized a perfused rat liver model.
- Administered ethanol and measured portal pressure.
- Infused nitric oxide synthesis inhibitor (N(G)-monomethyl-L-arginine) and nitric oxide precursor (L-arginine) to assess NO's role.
Main Results:
- Ethanol infusion dose-dependently increased portal pressure in the perfused rat liver.
- Inhibition of nitric oxide synthesis exacerbated ethanol-induced portal pressure increases.
- Administration of L-arginine reversed the enhancement caused by the nitric oxide inhibitor.
Conclusions:
- Endogenous nitric oxide functions as a vasodilator in the liver.
- Nitric oxide mitigates ethanol-induced vasoconstriction and improves hepatic microcirculation perturbations.
- Findings highlight NO's protective role against ethanol's vascular effects in the liver.