GR 159897 is a competitive, brain-penetrated non-peptide NK2 receptor antagonist with anti-tumor effects. GR 159897 inhibits binding of [3H]GR100679 to human NK2-CHO cells and rat colon membranes (pKis: 9.51 and 10, respectively). It can antagonize bronch
Mequitamium iodide is a platelet activating factor (PAF) inhibitor. Mequitamium inhibits PAF-acether induced platelet aggregation and bronchoconstriction. Mequitamium is capable of inhibiting platelet-mediated effects of PAF by interfering with secondary
Leukotriene C4 (LTC4) is the parent cysteinyl-leukotriene produced by the LTC4 synthase-catalyzed conjugation of glutathione to LTA4. LTC4 is produced by neutrophils, macrophages, and mast cells, and by transcellular metabolism in platelets. It is one of the constituents of slow-reacting substance of anaphylaxis (SRS-A) and exhibits potent smooth muscle contracting activity. LTC4-induced bronchoconstriction and enhanced vascular permeability contribute to the pathogenesis of asthma and acute allergic hypersensitivity. The concentration of LTC4 required to produce marked contractions of lung parenchymal strips and isolated tracheal rings is about 1 nM. LTC4 methyl ester is a more lipid soluble form of LTC4. The biological activity of LTC4 methyl ester has not been reported.