Histamine receptor family (H1-H4) (HRH)

The histamine receptor family consists of four distinct G protein-coupled receptors, designated H1 through H4, which mediate the diverse physiological effects of the biogenic amine histamine. Histamine H1 receptors are widely distributed and primarily responsible for allergic responses, smooth muscle contraction, and the maintenance of wakefulness. H2 receptors are predominantly found in the gastric mucosa, where they play a critical role in stimulating the secretion of hydrochloric acid. H3 receptors act as presynaptic autoreceptors and heteroreceptors in the central nervous system, modulating the release of histamine and other neurotransmitters like dopamine and acetylcholine. H4 receptors are primarily expressed on hematopoietic and immune cells, where they regulate chemotaxis and inflammatory signaling. Pharmacological intervention in this family is highly successful, with H1-antagonists used for allergies, H2-blockers for peptic ulcers, and H3-inverse agonists for sleep disorders. Ongoing research into H4-antagonists aims to provide new therapeutic options for chronic inflammatory and autoimmune conditions.

Other names

Histamine receptorsHRH1HRH2HRH3HRH4H1 receptorH2 receptorH3 receptorH4 receptor

Antagonist, Inverse agonist, Agonist