H4 is highly expressed in bone marrow and white blood cells and regulates zymosan-induced neutrophil release from bone marrow and subsequent infiltration in the pleurisy model along with L-selectin.[4] It is also expressed in the colon, liver, lung, small intestine, spleen, testes, thymus, tonsils, and trachea.[5]
Functions
They have been shown to mediate mast cellchemotaxis.[6] It seems to do this by the mechanism of Gi-coupled decrease in cAMP. [7]
Pharmacologic potential
By inhibiting the H4 receptor, asthma and allergy may be treated.[7]
^ Oda T, Morikawa N, Saito Y, Masuho Y, Matsumoto S (2000). "Molecular cloning and characterization of a novel type of histamine receptor preferentially expressed in leukocytes". J. Biol. Chem.275 (47): 36781–6. doi:10.1074/jbc.M006480200. PMID 10973974.
^ Nakamura T, Itadani H, Hidaka Y, Ohta M, Tanaka K (2000). "Molecular cloning and characterization of a new human histamine receptor, HH4R". Biochem. Biophys. Res. Commun.279 (2): 615–20. doi:10.1006/bbrc.2000.4008. PMID 11118334.
^ Takeshita K, Bacon KB, Gantner F (2004). "Critical role of L-selectin and histamine H4 receptor in zymosan-induced neutrophil recruitment from the bone marrow: comparison with carrageenan". J. Pharmacol. Exp. Ther.310 (1): 272–80. doi:10.1124/jpet.103.063776. PMID 14996947.
^ Varga C, Horvath K, Berko A, Thurmond RL, Dunford PJ, Whittle BJ. Inhibitory effects of histamine H4 receptor antagonists on experimental colitis in the rat. European Journal of Pharmacology. 2005 Oct 17;522(1-3):130-8. PMID 16213481
^ Coruzzi G, Adami M, Guaita E, de Esch IJ, Leurs R. Antiinflammatory and antinociceptive effects of the selective histamine H4-receptor antagonists JNJ7777120 and VUF6002 in a rat model of carrageenan-induced acute inflammation. European Journal of Pharmacology. 2007 Jun 1;563(1-3):240-4. PMID 17382315