Transcellular metabolism of leukotrienes in the lung
TD Bigby - Cell-Cell Interactions in the Release of Inflammatory …, 1991 - Springer
TD Bigby
Cell-Cell Interactions in the Release of Inflammatory Mediators: Eicosanoids …, 1991•SpringerLeukotrienes are a family of oxygenated metabolites derived from the 5-lipoxygenase
pathway of arachidonic acid metabolism via the unstable epoxide intermediate 5 (S) 5, 6-
oxido-7, 9-trans-11, 14-cis-eicosatetraenoic acid or leukotriene A 4 (LTA4). Leukotrienes
have potent effects on inflammatory cell Chemotaxis, adherence, and activation. They also
have effects on noninflammatory cells and tissues thus increasing vascular permeability 1,
inducing smooth muscle contraction, modulating T-and B-cell function 2, augmenting natural …
pathway of arachidonic acid metabolism via the unstable epoxide intermediate 5 (S) 5, 6-
oxido-7, 9-trans-11, 14-cis-eicosatetraenoic acid or leukotriene A 4 (LTA4). Leukotrienes
have potent effects on inflammatory cell Chemotaxis, adherence, and activation. They also
have effects on noninflammatory cells and tissues thus increasing vascular permeability 1,
inducing smooth muscle contraction, modulating T-and B-cell function 2, augmenting natural …
Abstract
Leukotrienes are a family of oxygenated metabolites derived from the 5-lipoxygenase pathway of arachidonic acid metabolism via the unstable epoxide intermediate 5(S)5,6-oxido-7,9-trans-11,14-cis-eicosatetraenoic acid or leukotriene A4 (LTA4). Leukotrienes have potent effects on inflammatory cell Chemotaxis, adherence, and activation. They also have effects on noninflammatory cells and tissues thus increasing vascular permeability1, inducing smooth muscle contraction, modulating T- and B-cell function2, augmenting natural killer activity3, and inducing fibroblast Chemotaxis4. In humans, the distribution of the 5-lipoxygenase enzyme appears to be limited to inflammatory cells1. Within these cells, the 5-lipoxygenase enzyme is stimulated by millimolar calcium concentrations and ATP 5, associating with the cell membrane via the 5-lipoxygenase-activating protein6. The enzyme then inserts molecular oxygen at the C5 position of unesterified arachidonic acid and, in turn, further converts the resultant hydroperoxide, 5(S)-hydroperoxyeicosatetraenoic acid (5-HPETE), into LTA4. This epoxide is the pivotal intermediate in the 5-lipoxygenase pathway and can be metabolized within inflammatory cells to 5(S),12(R)-dihydroxy-6, 14-cis, 8, 10-trans-eicosatetraenoic acid (leukotriene B4, LTB4) by LTA4 hydrolase or to 5(S)-hydroxy-6(R)-S-glutathionyl-7, 9-trans-ll, 14-cis-eicosatetraenoic acid (leukotriene C4, LTC4) by glutathione-S-transferase 1.
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