Polyunsaturated fatty acid metabolism and acetylated low density lipoprotein uptake in J774A.1 cells.

Abstract:

:The mechanism of the antiatherogenic activity of n-3 polyunsaturated fatty acids is not well understood. In these studies, we studied the metabolism of unsaturated fatty acids in murine macrophage-like J774A.1 cells. The major metabolic pathway of 18- and 20-carbon chain unsaturated fatty acids in these cells is the sequence of 2-carbon chain elongation, successive two steps of delta 8- and delta 5-desaturation, and additional elongation. Polyunsaturated fatty acids, arachidonic acid [20:4 (n-6)] and eicosapentaenoic acid [20:5 (n-3)], are elongated into 22:4 (n-6) and 22:5 (n-3) fatty acids, respectively. Accumulation of 22:4 (n-6) and 22:5 (n-3) fatty acids shows that J774A.1 cells have an active chain elongation activity, but lack delta 4-desaturase activity. Furthermore, J774A.1 cells demonstrated almost negligible delta 6-desaturase activity. Enrichment of the membrane lipids of J774A.1 cells with polyunsaturated fatty acids, arachidonic acid [(20:4 (n-6)] and eicosapentaenoic acid [(20:5 (n-3)], increased membrane fluidity and decreased the uptake of acetylated low density lipoprotein.

journal_name

Arch Biochem Biophys

authors

Shichiri G,Kinoshita M,Saeki Y

doi

10.1006/abbi.1993.1277

subject

Has Abstract

pub_date

1993-06-01 00:00:00

pages

231-7

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(83)71277-4

journal_volume

303

pub_type

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