Abstract
The cysteinyl leukotrienes (cys-LTs), leukotriene C4, (LTC4), LTD4, and LTE4, are lipid mediators of inflammation. LTC4 is the only intracellularly synthesized cys-LT through the 5-lipoxygenase and LTC4 synthase pathway and after transport is metabolized to LTD4 and LTE4 by specific extracellular peptidases. Each cys-LT has a preferred functional receptor in vivo; LTD4 to the type 1 cys-LT receptor (CysLT1R), LTC4 to CysLT2R, and LTE4 to CysLT3R (OXGR1 or GPR99). Recent studies in mouse models revealed that there are multiple regulatory mechanisms for these receptor functions and each receptor plays a distinct role as observed in different mouse models of inflammation and immune responses. This review focuses on the integrated host responses to the cys-LT/CysLTR pathway composed of sequential ligands with preferred receptors as seen from mouse models. It also discusses potential therapeutic targets for LTC4 synthase, CysLT2R, and CysLT3R.
Keywords:
Animal models; Arachidonic acid; Epithelial cells; G protein-coupled receptors; Hematopoietic cells; Inflammation; Lipid mediators; Membrane proteins.
© 2019 Elsevier Inc. All rights reserved.
MeSH terms
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5-Lipoxygenase-Activating Proteins / genetics
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5-Lipoxygenase-Activating Proteins / metabolism
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Animals
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Arachidonate 5-Lipoxygenase / genetics
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Arachidonate 5-Lipoxygenase / metabolism
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Asthma, Aspirin-Induced / immunology
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Asthma, Aspirin-Induced / metabolism
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Cysteine / biosynthesis
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Cysteine / chemistry
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Cysteine / metabolism
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Cysteine / physiology*
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Dipeptidases / genetics
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Dipeptidases / metabolism
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Glutathione Transferase / genetics
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Glutathione Transferase / metabolism
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Group IV Phospholipases A2 / genetics
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Group IV Phospholipases A2 / metabolism
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Humans
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Inflammation / immunology*
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Inflammation / metabolism
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Leukotriene C4 / biosynthesis
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Leukotriene C4 / chemistry
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Leukotriene C4 / metabolism
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Leukotriene C4 / physiology*
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Leukotriene E4 / biosynthesis
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Leukotriene E4 / chemistry
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Leukotriene E4 / metabolism
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Leukotriene E4 / physiology*
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Leukotrienes / biosynthesis
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Leukotrienes / chemistry
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Leukotrienes / metabolism
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Leukotrienes / physiology*
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Mice
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Neoplasms / genetics
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Neoplasms / immunology
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Neoplasms / metabolism
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Receptors, Leukotriene / genetics
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Receptors, Leukotriene / immunology*
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Receptors, Leukotriene / metabolism
Substances
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5-Lipoxygenase-Activating Proteins
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Leukotrienes
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Receptors, Leukotriene
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cysteinyl-leukotriene
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Leukotriene C4
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Leukotriene E4
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Arachidonate 5-Lipoxygenase
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Glutathione Transferase
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Group IV Phospholipases A2
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Dipeptidases
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leukotriene-C4 synthase
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Cysteine
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leukotriene D4 receptor