There is mounting evidence that 5-hydroxytryptamine (5-HT) plays a role in asthma.
Major 5-HT receptor subtypes are constitutively expressed in the guinea pig lung.
Allergic sensitization modifies the expression of 5-HT2A, 5-HT4 and 5-HT7 receptors.
The role of 5-HT in the pathogenesis of asthma might lead to novel promising therapeutic approaches in the treatment of allergic airway diseases.