Tranilast(Rizaben®)の抗アレルギー作用について

抗アレルギー剤（脱顆粒抑制剤）の1つであるtranilastの肥満細胞の遊離機序に対する抑制作用について検討を加えた。1．抗原刺激時の肥満細胞の(45)Ca uptakeおよびヒスタミン遊離に対して，tranilastは有意の抑制作用を示したが，comp.48/80刺激時にはtranilastの(45)Ca uptake，ヒスタミン遊離に対する抑制作用はほとんどみられなかった。2．phosphatidylserine添加時には，(45)Ca uptakeに対するtranilastの抑制作用は減弱傾向を示し，この傾向はヒスタミン遊離に対する作用に比べより高度であった。3．抗原および抗ヒトIgEによる好塩基球からのヒスタミン遊離に対して，tranilastは明らかな抑制作用を示さなかった。

Tlanilast is clinically used for bronchial asthma as one of the prophylactic agents for asthma attacks. In this study, anti-allergic actions of tranilast were examined in (45)Ca uptake of and histamine release from target cells of IgE after stimulation with antigen, anti-IgE and camp. 48/80. 1. (45)Ca uptake of and histamine release from rat peritoneal mast cells stimulated by antigen were significantly inhibited by preincubation of the cells with tranilast. Inhibition by tranilast of increased (45)Ca uptake of mast cells by addition of phosphatidylserine were less, although inhibition of histamine release was not so affected by addition of phosphatidylserine. No significant inhibition by tranilast of (45)Ca uptake and histamine release was not observed when the cells were stimulated by camp. 48/80. 2. Tranilast showed any inhibitory effects on basophil histamine release induced by antigen and anti-IgE.