The present invention provides an agent for prevention and/or treatment of asthma comprising a substance capable of suppressing the function involved in signal transduction of GPR4 as an active ingredient. It also provides an agent for prevention and/or treatment of asthma which comprises a nitrogen-containing tricyclic compound represented by the formula (I) or a quaternary ammonium salt thereof, or a pharmaceutically acceptable salt thereof;
[wherein R
1
represents a substituted or unsubstituted lower alkyl, or the like; R
2
represents hydrogen, a substituted or unsubstituted lower alkyl, or the like; R
3
and R
4
are the same or different and each represents hydrogen, lower alkyl, or the like; n represents 0 or 1; X represents —(CH
2
)
2
—, or the like; and Y represents the formula (II)
(wherein W represents CH or a nitrogen atom; Z
1
and Z
2
are the same or different and each represents hydrogen, a substituted or unsubstituted lower alkyl, or the like; and Z
3
represents hydrogen, a substituted or unsubstituted lower alkyl, or the like)] as an active ingredient.
本发明提供了一种用于预防和/或治疗哮喘的药剂,其包括一种能够抑制GPR4
信号转导功能的物质作为活性成分。还提供了一种用于预防和/或治疗哮喘的药剂,其包括式(I)所表示的含氮
三环化合物或其季
铵盐,或其药学上可接受的盐;[其中R1表示取代或未取代的低碳基等;R2表示氢、取代或未取代的低碳基等;R3和R4相同或不同,每个表示氢、低碳基等;n表示0或1;X表示—(
CH2)2—等;Y表示式(II)(其中W表示CH或氮原子;Z1和Z2相同或不同,每个表示氢、取代或未取代的低碳基等;Z3表示氢、取代或未取代的低碳基等)]作为活性成分。