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Journal of Lipid Research, Vol 17, 616-621, Copyright © 1976 by Lipid Research, Inc.

ARTICLES

Effect of epinephrine on the oxidative desaturation of fatty acids in the rat

NT de Gomez Dumm, MJ de Alaniz and RR Brenner

The effect of epinephrine on the oxidative desaturation of fatty acids by liver microsomal preparations of rats has been studied. Administration of epinephrine (1 mg/kg body weight) produced a significant decrease in desaturation of [l-14C]=linoleic acid to gamma- linolenic acid and of [L-14C]alpha-linolenic acid to actadeca-6,9,12,15- tetraenoic acid 12 hr after the infection. Lower doses produced a lesser effect on the delta6-desaturation activity. Epinephrine administration modified the V max of linoleic acid desaturation but not the K m. There was also a slight increase in palmityl desaturation activity. The effect of epinephrine on delta6-desaturation activity was postulated to be mediated through an enhancement of the intracellular cyclic AMP levels that lead to an increase of a glucose metabolite. This metabolite would inhibit delta6-desaturation activity.
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