Abstract
The hydroperoxides corresponding to the main molecular species of phosphatidylcholine (PC) and phosphatidylethanolamine (PE) where determined after lipoxygenase treatment of erythrocyte membranes from healthy children. This work was a preliminary study prior to applying this analytical procedure to erythrocyte membranes from children with diseases associated with vitamin E deficiency. The total molecular species corresponding to 20:4 and 22:6 associated with 16:0 and 18:0 were significantly higher in PE (26.94±4.70 nmol/mg protein) than in PC (20.14±6.70 nmol/mg protein); these concentrations represented 63% of the total molecular species in PE and 22% in PC. However, the concentrations of hydroperoxides produced from these polyunsaturated fatty acid molecular species were in the same order of magnitude in PC (3.98±1.56 nmol/mg protein) and in PE (3.61±1.63 nmol/mg protein). In contrast, the molecular species concentrations containing two double bounds, such as 16:0/18:2 and 18:0/18:2 and their corresponding hydroperoxides, were clearly more elevated in PC than in PE. There was a positive relationship between the concentrations of α-tocopherol and each hydroperoxide of PC and PE, and this association was particularly strong in PE (P≤0.0001). These results suggest that α-tocopherol exerts a stabilizing effect toward hydroperoxides, limiting their further degradation into peroxyl radicals. The protective effect of α-tocopherol could be more effective in PE because more polyunsaturated fatty acids were present.
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Abbreviations
- GLC:
-
gas-liquid chromatography
- GPx:
-
glutathione peroxidase
- 15-HPETE:
-
15-hydroperoxyeicosatetraenoic acid
- HPLC:
-
high-performance liquid chromatography
- PC:
-
phosphatidylcholine
- PE:
-
phosphatidyl-ethanolamine
- 16:0/18:2 PC:
-
1-palmitoyl-2-linoleoyl-sn-glycero-3-PC
- 16:0/20:4 PC:
-
1-palmitoyl-2-arachidonoyl-sn-glycero-3-PC
- 16:0/22:6 PC:
-
1-palmitoyl-2-docosahexaenoyl-sn-glycero-3-PC
- 18:0/18:2 PC:
-
1-stearoyl-2-linoleoyl-sn-glycero-3-PC
- 18:0/22:6 PC:
-
1-stearoyl-2-arachidonoyl-sn-glycero-3-PC
- 16:0/18:2 PE:
-
1-palmitoyl-2-linoleoyl-sn-glycero-3-PE
- 16:0/20:4 PE:
-
1-palmitoyl-2-arachidonoyl-sn-glycero-3-PE
- 16:0/22:6 PE:
-
1-palmitoyl-2-docosahexaenoyl-sn-glycero-3-PE
- 18:0/18:2 PE:
-
1-stearoyl-2-linoleoyl-sn-glycero-3-PE
- 18:0/20:4 PE:
-
1-stearoyl-2-arachidonoyl-sn-glycero-3-PE
- 18:0/22:6 PE:
-
1-stearoyl-2-docosahexaenoyl-sn-glycero-3-PE
- PUFA:
-
polyunsaturated fatty acids
- TBARS:
-
thiobarbituric acid reactive substances
- UV:
-
ultraviolet
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Therond, P., Couturier, M., Demelier, J.F. et al. Hydroperoxides of erythrocyte phospholipid molecular species formed by lipoxygenase correlate with α-tocopherol levels. Lipids 31, 703–708 (1996). https://doi.org/10.1007/BF02522885
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DOI: https://doi.org/10.1007/BF02522885