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Asymmetric incorporation of dietary n-3 fatty acids into membrane aminophospholipids of human erythrocytes

Dietary supplementation with different classes of polyunsaturate fatty acids is known to result in their incorporation into cell membranes, but the effects of this on eicosanoid formation and other cell functions frequently does not correspond to the degree of alteration in total membrane fatty acid...

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Published in:Journal of lipid research 1994-07, Vol.35 (7), p.1283-1291
Main Authors: Knapp, H R, Hullin, F, Salem, Jr, N
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description Dietary supplementation with different classes of polyunsaturate fatty acids is known to result in their incorporation into cell membranes, but the effects of this on eicosanoid formation and other cell functions frequently does not correspond to the degree of alteration in total membrane fatty acids. This phenomenon may be related to the compartmentalization of polyunsaturate fatty acids both within the organelles and within membranes. Aminophospholipids are asymmetrically distributed across the membrane bilayers of most human cells. These phospholipids are highly enriched in polyunsaturated fatty acids, and are known to have specific interactions with a number of membrane proteins. To determine whether dietary n-3 fatty acids are preferentially incorporated into membrane lipids in a particular spatial pattern, we have utilized the nonpermeant aminophospholipid probe, trinitrobenzenesulfonic acid, to study the transmembrane molecular species distribution of human erythrocyte ethanolamine phospholipids and phosphatidylserines before and at the end of 4 weeks of dietary supplementation with n-3 fatty acids. Selective incorporation of n-3 fatty acids occurred in the inner membrane leaflet ethanolamine phospholipids, particularly into the alkenyl-acyl species. The n-3 species in phosphatidylserines, particularly 18:0 and 22:6 n-3 (sn-1 and sn-2, respectively), replaced n-6 and n-9 species. These data may provide a basis for different cell responses to n-3 fatty acid enrichment, and for different degrees of diet-induced alteration in responses involving inner and outer membrane leaflet functions.
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The n-3 species in phosphatidylserines, particularly 18:0 and 22:6 n-3 (sn-1 and sn-2, respectively), replaced n-6 and n-9 species. 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This phenomenon may be related to the compartmentalization of polyunsaturate fatty acids both within the organelles and within membranes. Aminophospholipids are asymmetrically distributed across the membrane bilayers of most human cells. These phospholipids are highly enriched in polyunsaturated fatty acids, and are known to have specific interactions with a number of membrane proteins. To determine whether dietary n-3 fatty acids are preferentially incorporated into membrane lipids in a particular spatial pattern, we have utilized the nonpermeant aminophospholipid probe, trinitrobenzenesulfonic acid, to study the transmembrane molecular species distribution of human erythrocyte ethanolamine phospholipids and phosphatidylserines before and at the end of 4 weeks of dietary supplementation with n-3 fatty acids. Selective incorporation of n-3 fatty acids occurred in the inner membrane leaflet ethanolamine phospholipids, particularly into the alkenyl-acyl species. The n-3 species in phosphatidylserines, particularly 18:0 and 22:6 n-3 (sn-1 and sn-2, respectively), replaced n-6 and n-9 species. These data may provide a basis for different cell responses to n-3 fatty acid enrichment, and for different degrees of diet-induced alteration in responses involving inner and outer membrane leaflet functions.</abstract><cop>United States</cop><pub>Elsevier</pub><pmid>7964189</pmid><doi>10.1016/S0022-2275(20)39971-5</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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subjects aceites de pescado
acide gras insature
acide gras polyinsature
acidos grasos insaturados
acidos grasos poliinsaturados
cefalinas
cephaline
cephalins
corps gras
diet
dieta
Dietary Fats - blood
eritrocitos
erythrocyte
Erythrocyte Membrane - metabolism
erythrocytes
fats
Fatty Acids, Omega-3 - blood
fish oils
grasas
hombres
homme
huile de poisson
Humans
Male
membrana
membrane
Membrane Lipids - blood
membranes
men
Phosphatidylserines - blood
Phospholipids - blood
polyunsaturated fatty acids
regime alimentaire
unsaturated fatty acids
title Asymmetric incorporation of dietary n-3 fatty acids into membrane aminophospholipids of human erythrocytes
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