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• W2898193802 abstract "Abstract Ginkgolide B (GB) and picrotoxin (PTX) are antagonists of the major inhibitory receptors of the central nervous system: GABA and glycine receptors (GlyRs). GlyRs contain one or more of the four alpha subunit isoforms of which α1 and α2 have been extensively studied. This report compares GB and PTX block of α3 GlyRs expressed in HEK 293 cells, using whole-cell patch clamp techniques. In CNS, α3 exists as a heteropentamer in conjunction with beta subunits in a 2α:3β ratio. Thus, the nature of block was also tested in α3β heteromeric glycine receptors. GB and PTX blocked α3 GlyRs both in the presence (liganded state) and absence of glycine (unliganded state). This property is unique to α3 subunits; α1 and α2 subunits are only blocked in the liganded state. The GB block of α3 GlyRs is voltage-dependent (more effective when the cell is depolarized) and non-competitive, while the PTX block is competitive and not voltage-dependent. The heteromeric and homomeric α3 GlyRs recovered significantly faster from unliganded GB block compared to liganded GB block, but no such distinction was found for PTX block suggesting more than one binding site for GB. This study sheds light on features of the α3 GlyR that distinguish it from the more widely studied α1 and α2 subunits. Understanding these properties can help decipher the physiological functioning of GlyRs in the CNS and may permit development of subunit specific drugs." @default.
• W2898193802 created "2018-11-02" @default.
• W2898193802 creator A5024049365 @default.
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• W2898193802 date "2018-10-26" @default.
• W2898193802 modified "2023-09-26" @default.
• W2898193802 title "Characterization of α3 Glycine Receptors with Ginkgolide B and Picrotoxin" @default.
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• W2898193802 doi "https://doi.org/10.1101/454710" @default.
• W2898193802 hasPublicationYear "2018" @default.
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