Importance of the α and ω ends of the substrate for metabolism
by 5-HEDH. A, time courses for the metabolism of 5-HETE (2 μM) to 5-oxo-ETE
(□) and 5-HETE-Me (2 μM) to 5-oxo-ETE-Me (•) by microsomal
fractions (30 μg/ml protein) from human neutrophils in the presence of
NADP+ (100 μM). B, concentration-response relationships for the
effects of 5-HETE-Me (•) and 5,18-diOH-18:2 (▵) on the conversion of
5-HETE (1 μM) to 5-oxo-ETE by neutrophil and U937 cell microsomes,
respectively, in the presence of NADP+ (100 μM). Microsomal
fractions (30 μg/ml protein) were incubated with 5-hydroxy fatty acids for
15 min. C, time courses for the metabolism of 5-HETE to 5-oxo-ETE (□),
5h-18:2 to 5-oxo-18:2 (○), and 5,18-diOH-18:2 to 5-oxo-18-HODE (•) by
microsomal fractions (30 μg/ml protein) from PMA-differentiated U937 cells
in the presence of NADP+ (100 μM). All values are means ±
S.E. (n = 4).