Schnell, David and Brunskole, Irena and Ladova, Katerina and Schneider, Erich H. and Igel, Patrick and Dove, Stefan and Buschauer, Armin and Seifert, Roland (2011) Expression and functional properties of canine, rat and murine histamine H4-receptors in Sf9 insect cells. Naunyn-Schmiedeberg's Archives of Pharmacology 383 (5), pp. 457-470.
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The histamine H4-receptor (H4R) is expressed on cells of the immune system including eosinophils, dendritic cells and T cells and plays an important role in the pathogenesis of bronchial asthma, atopic dermatitis and pruritus. Analysis of the H4R in these diseases depends on the use of animal models. However, there are substantial pharmacological differences between various H4R species orthologs. The purpose of this study was to analyze the pharmacological properties of canine (c), rat (r) and murine (m) H4R in comparison to human (h) H4R expressed in Sf9 insect cells. Only hH4R and cH4R exhibited a sufficiently high [3H]histamine affinity for radioligand binding studies. Generally, cH4R exhibited lower ligand-affinities than hH4R. Similarly, in high-affinity GTPase studies, ligands were more potent at hH4R than at other H4R species orthologs. Unlike the other H4R species orthologs, hH4R exhibited high agonist-independent (constitutive) activity. Most strikingly, the prototypical H4R antagonist (1-[(5-chloro-1H-indol-2-yl)carbonyl]-4-methylpiperazine) (JNJ7777120) exhibited partial agonistic activity at cH4R, rH4R and mH4R, whereas at hH4R, JNJ7777120 was a partial inverse agonist. H4R agonists from the class of NG-acylated imidazolylpropylguanidines and cyanoguanidines exhibited substantial differences in terms of affinity, potency and efficacy among H4R species orthologs, too. The species-dependent pharmacological profiles are not due to the highly variable amino acid sequence position 341. Finally, H4R species orthologs differ from each other in terms of regulation by NaCl. Collectively, there are profound pharmacological differences between H4R species orthologs. Most importantly, caution must be exerted when interpreting pharmacological effects of “the prototypical H4R antagonist” JNJ7777120 as H4R antagonism.
|Institutions:|| Chemistry and Pharmacy > Institute of Pharmacy > Pharmaceutical/Medicinal Chemistry II (Prof. Buschauer) |
Chemistry and Pharmacy > Institute of Pharmacy > Pharmacology and Toxicology (Prof. Schlossmann formerly Prof. Seifert)
|Projects:||GRK 760, Graduiertenkolleg Medizinische Chemie|
|Keywords:||histamine H4-receptor, histamine, receptor species orthologs, JNJ7777120, GTPase, Sf9 insect cells|
|Subjects:||500 Science > 570 Life sciences|
500 Science > 540 Chemistry & allied sciences
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Owner:||Prof. Armin Buschauer|
|Deposited On:||15 Dec 2010 13:32|
|Last Modified:||30 Apr 2011 16:41|
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