Oligomerization of recombinant and endogenously expressed human histamine H(4) receptors

Molecular Pharmacology
Richard M van RijnRob Leurs

Abstract

In this study, we report the homo- and hetero-oligomerization of the human histamine H(4)R by both biochemical (Western blot and immobilized metal affinity chromatography) and biophysical [bioluminescence resonance energy transfer and time-resolved fluorescence resonance energy transfer (tr-FRET)] techniques. The H(4)R receptor is the most recently discovered member of the histamine family of G-protein-coupled receptors. Using specific polyclonal antibodies raised against the C-terminal tail of the H(4)R, we demonstrate the presence of H(4)R oligomers in human embryonic kidney 293 and COS-7 cells heterologously overexpressing H(4)Rs and putative native H(4)R oligomers in human phytohaemagglutinin blasts endogenously expressing H(4)Rs. Moreover, we show that H(4)R homo-oligomers are formed constitutively, are formed at low receptor densities (300 fmol/mg of protein), and are present at the cell surface, as detected by tr-FRET. The formation of these oligomers is independent of N-glycosylation and is not modulated by H(4)R ligands, covering the full spectrum of agonists, neutral antagonists, and inverse agonists. Although we show H(4)R homo-oligomer formation at physiological expression levels, the detection of H(1)R-H(4)R hetero...Continue Reading

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Citations

Dec 19, 2009·Inflammation Research : Official Journal of the European Histamine Research Society ... [et Al.]·N L Lethbridge, P L Chazot
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Aug 28, 2021·Biomolecules·Xiaoyuan MaHenry F Vischer

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