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In vitro conversion of erucic acid by microsomes and mitochondria from liver, kidneys and heart of rats

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Lipids

Abstract

Microsomes and mitochondria of liver, kidneys, and heart were incubated with [14-14C]erucic acid in three assay media: one favorable for chain elongation (NADPH+KCN), another favorable for β-oxidation and the last one for shortening (NADP+KCN). Elongating reactions occurred mainly in microsomes, those of kidneys being very active; the mitochondria also showed some activity, heart mitochondria being, however, more active than the microsomes, when considering the amount of erucic acid activated. In the medium for β-oxidation, practically no shortened fatty acids were found. On the contrary, when β-oxidation was inhibited, and in the presence of NADP, the formation of shorter monoenes, probably in the outer membrane of the mitochondria, was observed, namely eicosenoic acid in high amount, oleic acid and hexadecenoic acid. Mitochondria from liver were very active as were those of heart, when compared with the quantity of activated erucic acid. In heart, the mitochondria shortened erucic acid into oleic acid and hexadecenoic acid, which were then probably used as energy substrates. With carnitine and without NADP, shortened fatty acids were formed in the mitochondria of liver, probably by the first reactions of β-oxidation. In this case, the proportions of oleic acid and hexadecenoic acid were higher than with NADP alone. In the presence of carnitine and NADP, the level of the chain-shortening reaction did not differ from that observed with NADP alone. It appears, therefore, that the activated erucic acid is mainly directed towards shortening reactions and not towards transfer reactions across the mitochondrial membranes.

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Clouet, P., Bezard, J. In vitro conversion of erucic acid by microsomes and mitochondria from liver, kidneys and heart of rats. Lipids 14, 268–273 (1979). https://doi.org/10.1007/BF02533913

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  • DOI: https://doi.org/10.1007/BF02533913

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