Copyright © 1986 by The American Medical Society on Alcoholism and The Research Society on Alcoholism.
The Effect of Ethanol on the β-Oxidation of Fatty Acids
Version of Record online: 29 JUN 2007
Alcoholism: Clinical and Experimental Research
Volume 10, Issue Supplement s1, pages 64S–68S, December 1986
How to Cite
Grunnet, N. and Kondrup, J. (1986), The Effect of Ethanol on the β-Oxidation of Fatty Acids. Alcoholism: Clinical and Experimental Research, 10: 64S–68S. doi: 10.1111/j.1530-0277.1986.tb05182.x
- Issue online: 29 JUN 2007
- Version of Record online: 29 JUN 2007
- Received for publication March 3. 1986; accepted for publication March 11. 1986
The application of radiolabeled fatty acids to measurements of fatty add oxidation is discussed and a method for measuring the rate of β-oxidation and of acetyt-CoA oxidation to CO2 is described. In hepatocytes from starved or fed rats, ethanol inhibited total /?-oxidation in the presence of 1.3 mm palmitate by 22% and 25%, respectively. If changes in the specific radioactivity of acetyl-CoA were not corrected for, the effect of ethanol would have been overestimated by 15% and underestimated by 15% in hepatocytes from fed and starved rats, respectively. In perfused liver from fed rats, inhibition by ethanol of total β-oxidation in the presence of 1 mm palmitate was 35%. The rate of β-oxidation in the absence of ethanol was underestimated by 65% if proper corrections were not applied. Inhibition of the tricarboxylic acid cycle by ethanol was 57% and 72% in hepatocytes from starved and fed rats, respectively. Pyrazoie titration experiments demonstrated a correlation between changes in the mitochondrial NADH/NAD+ ratio and both inhibition of the tricarboxylic acid cycle and inhibition of the β-oxidation pathway. The concentration of acetoacetyl-CoA is suggested as an additional regulatory factor of the β-oxidation pathway. The ethanol-induced accumulation of triacylglycerol as a consequence of the inhibition of the β-oxidation pathway is estimated to represent a 10% increase in the cellular triacylglycerol pool/hr/g of wet weight Hence its chemical determination requires experiments of several hours duration. Primary cultures of hepatocytes have been shown to be a useful experimental system for studies of the ethanol-induced triacylglycerol accumulation.