Receptorium histamini
Receptoria histamini sunt receptoria neurotransmissoria et classis receptoriorum proteino G copulatorum cum histamino ligando endogeno. Adhuc quattuor typi receptoriorum histamini noti sunt: Receptorium histamini H1 - Contractiones ilei, vasodilatatio, pruritus, bronchoconstrictio. Antagonista H1 receptorii: Diphenhydraminum, Loratadinum, Cetirizinum, Fexofenadinum, Clemastinum Receptorium histamini H2 - Stomachus: incrementum secretionis chymi. Antagonista H2 receptorii: Ranitidinum, Cimetidinum, Famotidinum, Nizatidinum Receptorium histamini H3 - deminutio concentrationis in cerebro Acetylcholini, Serotonini, Noradrenalini Receptorium histamini H4 - Chemotaxis (mastocytus)