Modulation of recombinant human alpha 1 glycine receptor by flavonoids and gingerols

Breitinger U, Sticht H, Breitinger HG (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Biological Chemistry Walter de Gruyter

DOI: 10.1515/hsz-2020-0360

Abstract

The inhibitory glycine receptor (GlyR) is a principal mediator of fast synaptic inhibition in mammalian spinal cord, brainstem, and higher brain centres. Flavonoids are secondary plant metabolites that exhibit many beneficial physiological effects, including modulatory action on neuronal receptors. Using whole-cell current recordings from recombinant human α1 GlyRs, expressed in HEK293 cells, we compared the flavonols kaempferol and quercetin, the flavanone naringenin, the flavones apigenin and nobiletin, the isoflavone genistein, and two gingerols, 6-gingerol and 8-gingerol for their modulation of receptor currents. All compounds were inhibitors of the GlyR with IC50values ranging between 9.3 ± 2.6 μM (kaempferol) and 46.7 ± 6.5 μM (genistein), following a mixed mode of inhibition. Co-application of two inhibitors revealed distinct binding sites for flavonoids and gingerols. Pore-lining mutants T258A and T258S were strongly inhibited by quercetin and naringenin, but not by 6-gingerol, confirming the existence of distinct binding sites for flavonoids and gingerols. Apigenin, kaempferol, nobiletin, naringenin and 6-gingerol showed biphasic action, potentiating glycineinduced currents at low concentration of both, modulator and glycine, and inhibiting at higher concentrations. Identification of distinct modulatory sites for flavonoids and related compounds may present pharmacological target sites and aid the discovery of novel glycinergic drugs.

Authors with CRIS profile

Heinrich Sticht Professur für Bioinformatik

Involved external institutions

German University in Cairo (GUC) / الجامعة الألمانية بالقاهرة EG Egypt (EG)

How to cite

APA:

Breitinger, U., Sticht, H., & Breitinger, H.G. (2021). Modulation of recombinant human alpha 1 glycine receptor by flavonoids and gingerols. Biological Chemistry. https://dx.doi.org/10.1515/hsz-2020-0360

MLA:

Breitinger, Ulrike, Heinrich Sticht, and Hans Georg Breitinger. "Modulation of recombinant human alpha 1 glycine receptor by flavonoids and gingerols." Biological Chemistry (2021).

BibTeX: Download