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Comparative effect of glucagon, dibutyryl cyclic AMP, and epinephrine on the desaturation and elongation of linoleic acid by rat liver microsomes
Author(s) -
Gómez Dumm Irma N. T.,
Alaniz María J. T.,
Brenner Rofolfo R.
Publication year - 1976
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02532988
Subject(s) - linoleic acid , microsome , biochemistry , glucagon , polyunsaturated fatty acid , epinephrine , linolenic acid , fatty acid , biology , chemistry , medicine , endocrinology , enzyme , hormone
The effect of glucagon, dibutyryl cyclic adenosine 3′,5′‐monophosphate, and epinephrine on the biosynthesis of polyunsaturated fatty acids of the linoleic acid family was studied. The incubations were performed with rat liver microsomes and labeled linoleic acid under desaturating and elongating conditions. Under desaturating conditions, linoleic acid was converted to γ‐linolenic acid, whereas under elongating conditions it was converted to 20∶2ω6. Glucagon, dibutyryl cyclic AMP, and epinephrine decreased the oxidative desaturation of linoleic acid to γ‐linolenic acid while the elongating reaction was not modified in the experimental conditions tested. Consequently, the results support the hypothesis that the oxidative desaturation of linoleic acid to γ‐linolenic acid is the main controllable step in the biosynthesis of polyunsaturated fatty acids of the linoleic acid family in the microsomes.