Leukotriene C4 is a lipid-derived inflammatory hormone involved in bronchial smooth muscle contraction, vascular permeability regulation, mucosal signaling, and inflammatory communication. LTC4 belongs to the cysteinyl leukotriene family and plays major roles in respiratory physiology and allergic inflammatory responses.
The hormone promotes bronchoconstriction, airway edema, mucus secretion, and vascular permeability changes within respiratory tissues. LTC4 also influences eosinophil recruitment, endothelial signaling, and smooth muscle responsiveness. Through these actions, it contributes to coordination of inflammatory responses within airway and mucosal environments.
LTC4 is synthesized from arachidonic acid through the lipoxygenase pathway within activated immune cells. Five-lipoxygenase converts arachidonic acid into leukotriene A4 intermediates, which are then conjugated with glutathione through LTC4 synthase activity to form leukotriene C4.
Production occurs mainly in mast cells, eosinophils, basophils, macrophages, and additional inflammatory cell populations. Synthesis increases rapidly during allergen exposure, immune activation, oxidative stress, and inflammatory signaling. Because LTC4 is produced locally and acts quickly, its biological effects remain largely tissue-specific.
LTC4 production is regulated by immune receptor activation, inflammatory cytokines, phospholipase signaling pathways, calcium mobilization, oxidative stress, and mast-cell activation. Leukotriene synthesis pathways are closely integrated with inflammatory signaling networks and respiratory immune responses.
LTC4 acts mainly through cysteinyl leukotriene receptors located on airway smooth muscle, vascular tissue, inflammatory cells, and mucosal tissues. Receptor activation stimulates calcium signaling, smooth muscle contraction, vascular permeability changes, and mucus secretion pathways. Through these integrated lipid-signaling systems, LTC4 coordinates bronchial responsiveness, inflammatory adaptation, vascular signaling, and mucosal immune communication during respiratory and allergic inflammatory states.
LTC₄ is a lipid signaling molecule that modulates vascular tone and inflammatory tissue response.
