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Pranlukast

CAS No. : 103177-37-3

MCE 国际站：Pranlukast

产品活性：Pranlukast 是一种高效的竞争性的选择性 leukotriene 拮抗剂。Pranlukast 抑制 [³H]LTE₄，[³H]LTD₄ 和 [³H]LTC₄ 与肺膜结合，K_i 分别为 0.63±0.11，0.99±0.19 和 5640±680 nM。

研究领域：GPCR/G Protein  |  Metabolic Enzyme/Protease

作用靶点：Leukotriene Receptor  |  Endogenous Metabolite

In Vitro: In the radioligand binding assay, Pranlukast (ONO-1078) inhibits [³H]LTE₄, [³H]LTD₄, and [³H]LTC₄ bindings to lung membranes with K_is of 0.63±0.11, 0.99±0.19, and 5640±680 nM, respectively. The antagonism of Pranlukast against [³H]LTD₄ binding is competitive. In functional experiments, Pranlukast shows competitive antagonism against the LTC₄- and LTD₄-induced contractions of guinea pig trachea and lung parenchymal strips with a pA₂ range of 7.70 to 10.71. In the presence of an inhibitor of the bioconversion of LTC₄ to LTD₄, Pranlukast also antagonizes the LTC₄-induced contraction of guinea pig trachea (pA₂=7.78). Pranlukast significantly reverses the LTD₄-induced prolonged contraction without effect on the KCl- and BaCl₂-induced contractions of guinea pig trachea. Oxygen-glucose deprivation (OGD)-induced nuclear translocation of CysLT₁ receptors is inhibited by pretreatment with the CysLT₁ receptor antagonist Pranlukast (10 μM). Pranlukast protects endothelial cells against ischemia-like injury. The effects of the CysLT₁ receptor antagonist Pranlukast and the 5-lipoxygenase inhibitor Zileuton on translocation are also assessed. The results show that Pranlukast, but not Zileuton, inhibits the translocation of the CysLT₁ receptor 6 h after OGD.

In Vivo: Carrageenan (CAR, 5 mg per mouse) is injected i.p. 24 h before LPS (50 p,g per mouse) is injected i.v. Various doses of Pranlukast (ONO-1078; 40, 20, and 10 mmol/kg), AA-861 (20, 10, and 5 mmol/kg), Indomethacin (40 mmollkg), and the controls are injected s.c. into mice 30 min before they are challenged with 50 p,g of LPS. The maximum soluble doses are 0.6 mmol/mL in 10% DMSO for AA-861 and 1.2 mmol/mL in 10% ethanol for Pranlukast. These solutions are used as the maximum doses for the treatments. The mortality of mice is significantly decreased in AA-861- Pranlukast-treated mice relative to that in the control mice. Pretreatment with CAR (5 mg i.p.) renders the mice more sensitive to the effect of LPS. Although the survival rate of mice treated with each solvent is 20% at 72 h after LPS (50 p,g per mouse) administration, s.c. treatment with AA-861 (20 mmol/kg) or Pranlukast (40 mmol/kg) significantly increases the survival rate after the LPS administration (AA-861, P<0.001; Pranlukast, P<0.01).

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