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- W1639313500 abstract "Abstract We compared lipoxygenase activities of lung macrophages obtained from bronchoalveolar lavage to activities of blood monocytes purified by using discontinuous plasma/Percoll density gradients and adherence to tissue culture plastic in five normal subjects. Cells were incubated with ionophore A23187 (10(-9) to 10(-5) M) or arachidonic acid (0.12 to 80 microM) for 1 to 60 min at 37 degrees C to construct dose-response and time-dependence curves of lipoxygenase product generation. Products were identified and were quantified by using high-pressure liquid chromatography and ultraviolet spectroscopy. Under all conditions of product generation, both macrophages and monocytes generated predominantly (5S,12R)-dihydroxy-(6Z, 8E, 10E, 14Z)-eicosatetraenoic acid (leukotriene B4 (LTB4] and (5S)-hydroxy-(6E, 8Z, 11Z, 14Z) - eicosatetraenoic acid (5 - HETE), but, in each subject, macrophages invariably released greater amounts of LTB4 and 5-HETE than monocytes. In response to A23187, macrophages released a maximum of 183 +/- 96 pmol of LTB4 and 168 +/- 108 pmol of 5-HETE per 10(6) cells (mean +/- SEM), whereas monocytes released only 16 +/- 1 and 18 +/- 8 pmol per 10(6) cells of LTB4 and 5-HETE, respectively. After adding arachidonic acid, macrophages released a maximum of 52 +/- 21 pmol of LTB4 and 223 +/- 66 pmol of 5-HETE, whereas monocytes released no detectable products. The results suggest that mononuclear phagocyte maturation in the lung may be accompanied by an enhanced ability to generate 5-lipoxygenase products." @default.
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- W1639313500 date "1987-03-01" @default.
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- W1639313500 title "Enhanced 5-lipoxygenase activity in lung macrophages compared to monocytes from normal subjects." @default.
- W1639313500 doi "https://doi.org/10.4049/jimmunol.138.5.1546" @default.
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