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• W1963232116 abstract "Natively expressed serotonin 5-HT3 receptors typically possess a negative-slope conductance region in their I–V curve, due to a voltage-dependent block by external Ca2+ ions. However, in almost all studies performed with heterologously expressed 5-HT3 receptors, this feature was not observed. Here we show that mere addition of ATP to the pipette solution is sufficient to reliably observe a voltage-dependent block in homomeric (h5-HT3A) and heteromeric (h5-HT3AB) receptors expressed in HEK293 cells. A similar block was observed with a plethora of molecules containing a phosphate moiety, thus excluding a role of phosphorylation. A substitution of three arginines in the intracellular vestibule of 5-HT3A with their counterpart residues from the 5-HT3B subunit (RRR-QDA) was previously shown to dramatically increase single channel conductance. We find this mutant to have a linear I–V curve that is unaffected by the presence of ATP, with a fractional Ca2+ current (Pf%) that is reduced (1.8 ± 0.2%) compared to that of the homomeric receptor (4.1 ± 0.2%), and similar to that of the heteromeric form (2.0 ± 0.3%). Moreover, whereas ATP decreased the Pf% of the homomeric receptor, this was not observed with the RRR-QDA mutant. Finally, ATP was found to be critical for voltage-dependent channel block also in hippocampal interneurons that natively express 5-HT3 receptors. Taken together, our results indicate a novel mechanism by which ATP, and similar molecules, modulate 5-HT3 receptors via interactions with the intracellular vestibule of the receptor." @default.
• W1963232116 created "2016-06-24" @default.
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• W1963232116 date "2008-07-31" @default.
• W1963232116 modified "2023-09-27" @default.
• W1963232116 title "On the voltage-dependent Ca²⁺block of serotonin 5-HT₃receptors: a critical role of intracellular phosphates" @default.
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• W1963232116 doi "https://doi.org/10.1113/jphysiol.2008.153486" @default.
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