Histamine H1‐receptor‐mediated release of preformed mediators and cytokines and airway remodelling

Histamine is a chemical mediator synthesized and stored within secretory granules of human basophils and mast cells [1,2]. The central role of histamine as a mediator of allergic reactions is unchallenged and is also supported by the efficacy of antihistamines in relieving symptoms of the early-phase allergic response [3]. However, a recent hypothesis suggests that the role of histamine is not limited to the early-phase reaction, but may also have a role in the regulation of the late-phase response. This paper describes certain effects of histamine on human inflammatory cell activation, and in particular, its ability to directly activate human lung macrophages and the molecular mechanism for this interaction. These studies have important implications for the therapeutic potential of antihistamines in the treatment of patients with allergic disorders.