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Ethanol sulfation by the pulmonary ethanol metabolizing system (PET)
J Bernstein1, C Basilio, B Martinez
1Department of Physiology, School of Medicine, University of Puerto Rico, San Juan 00936.
Research Communications in Chemical Pathology and Pharmacology
|May 1, 1990
Summary
The lung metabolizes ethanol through sulfoconjugation, a process observed in rats, dogs, and rabbits. This metabolic pathway exhibits characteristics of allosteric enzymes, suggesting potential for ethanol metabolism in humans as well.
Area of Science:
- Pharmacology
- Biochemistry
- Pulmonary Medicine
Background:
- Ethanol metabolism primarily occurs in the liver, with limited understanding of its disposition in other organs.
- Sulfoconjugation is a known metabolic pathway for various xenobiotics, but its role in ethanol metabolism is less explored.
Purpose of the Study:
- To investigate the lung's capacity to metabolize ethanol via sulfoconjugation.
- To characterize the kinetic properties of ethanol sulfoconjugation in lung tissue from different species.
Main Methods:
- Incubation of lung slices from rats, dogs, and rabbits in Krebs Ringer bicarbonate buffer with varying ethanol concentrations.
- Measurement of ethanol metabolism rates and determination of kinetic parameters (Km, Vmax, Hill coefficient).
Main Results:
- Lung slices from rats, dogs, and rabbits demonstrated significant ethanol metabolism through sulfoconjugation.
- Ethanol metabolism exhibited concentration-dependent kinetics consistent with allosteric enzymes (Hill coefficient 1.69–2.07).
- Kinetic parameters (Km and Vmax) for ethanol sulfoconjugation were determined for each species, with preliminary evidence suggesting similar activity in human lung tissue.
Conclusions:
- The lung possesses a substantial capacity for ethanol metabolism via sulfoconjugation.
- While the lung can metabolize ethanol, in vivo efficiency may be constrained by substrate availability.