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Investigation of receptor binding and functional characteristics of hemopressin(1-7)

Dvorácskó, Szabolcs

Tömböly, Csaba

Berkecz, RĂłbert

Keresztes, Attila

Elsevier

2016

QH3011 Biochemistry / biokémia

The orally active, α-hemoglobin derived hemopressin (PVNFKFLSH, Hp(1-9)) and its truncated (PVNFKFL, Hp(1-7) and PVNFKF, Hp(1-6)) and extended ((R)VDPVNFKFLSH, VD-Hp(1-9) and RVD-Hp(1-9)) derivatives have been postulated to be the endogenous peptide ligands of the cannabinoid receptor type 1 (CB1). In an attempt to create a versatile peptidic research tool for the direct study of the CB1 receptor-peptide ligand interactions, Hp(1-7) was radiolabeled and in vitro characterized in rat and CB1 knockout mouse brain membrane homogenates. In saturation and competition radioligand binding studies, [3H]Hp(1-7) labeled membrane receptors with high densities and displayed specific binding to a receptor protein, but seemingly not to the cannabinoid type 1, in comparison the results with the prototypic JWH-018, AM251, rimonabant, Hp(1-9) and RVD-Hp(1-9) (pepcan 12) ligands in both rat brain and CB1 knockout mouse brain homogenates. Furthermore, functional [35S]GTP γS binding studies revealed that Hp(1-7) and Hp(1-9) only weakly activated G-proteins in both brain membrane homogenates. Based on our findings and the latest literature data, we assume that the Hp(1-7) peptide fragment may be an allosteric ligand or indirect regulator of the endocannabinoid system rather than an endogenous ligand of the CB1 receptor. © 2016 Elsevier Ltd.

angol

Article

PeerReviewed

info:eu-repo/semantics/article

text

http://real.mtak.hu/49649/1/DvoracskoNeuropeptides.pdf

Dvorácskó, Szabolcs and Tömböly, Csaba and Berkecz, Róbert and Keresztes, Attila (2016) Investigation of receptor binding and functional characteristics of hemopressin(1-7). NEUROPEPTIDES, 58. pp. 15-22. ISSN 0143-4179

http://real.mtak.hu/49649/

http://dx.doi.org/10.1016/j.npep.2016.02.001

MTMT:3028066; doi:10.1016/j.npep.2016.02.001