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Leukotriene D₄ (LTD₄) is an active metabolite of LTC₄ (Item Nos. 20210 | 10007241) and a constituent of slow-reacting substance of anaphylaxis (SRS-A). It is formed via metabolism of LTC₄ by γ-glutamyl transpeptidase. Like LTC₄, LTD₄ (0.01-0.1 pM) induces contractions in isolated guinea pig parenchymal strips and tracheal spirals. In vivo, LTD₄ increases insufflation pressure, a marker of bronchoconstriction, in anesthetized guinea pigs by 100% when administered at a dose of 89 pmol per animal. It also increases vascular permeability in guinea pig skin when administered intradermally at a dose of 0.1 pmol per animal.

LTD4 (Leukotriene D4) is a member of the leukotriene family shown to be a potent contractor of smooth muscle.

ChEBI: A leukotriene that is (7E,9E,11Z,14Z)-icosa-7,9,11,14-tetraenoic acid substituted by a hydroxy group at position 5 (5S) and a L-cysteinylglycinyl group at position 6 (6R).

Slow reacting substance of anaphylaxis (SRS-A). Potent bronchoconstrictor and mediator of asthmatic and inflammatory processes. Increases cytosolic free Ca2+ in epithelial cells.

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