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- W2059968271 abstract "Previous studies in this laboratory have shown that the ethanol inhibition of recombinant NMDA receptors expressed in Xenopus oocytes is subunit-dependent, with the NR1/2A receptor being more sensitive than NR1/2C receptors. The ethanol sensitivity of NR1/2A receptors is reduced by substitution of the wild-type NR1-1a (NR1(011)) subunit with the calcium-impermeable NR1 (N616R) subunit. In the present study, the ethanol inhibition of NMDA receptors was determined under different conditions to examine the role that calcium plays in determining the ethanol sensitivity of recombinant NMDA receptors. The ethanol sensitivity of NR1/2B or NR1/2C receptors was not affected by alterations in extracellular calcium levels or by coexpression with calcium-impermeable NR1 mutants. In contrast, the inhibition of NR1/2A receptors by 100 mM ethanol was reduced in divalent-free recording medium and was significantly increased when 10 mM calcium was used as the only charge carrier. The increase in the ethanol sensitivity of NR1/2A receptors under high-calcium conditions was prevented by preinjection of oocytes with the calcium chelator 1,2-bis-(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (BAPTA) but not by inhibitors of calmodulin or protein kinase C. Ethanol did not alter the channel blocking activity of divalent cations on NMDA-induced currents. The enhanced ethanol sensitivity of NR1/2A receptors in 10 mM calcium persisted when the NR1 subunit was replaced by the alternative splice variant NR1-4a (NR1(000)), which lacks the C1 and C2 cassettes. However, expression of a mutant NR1 subunit that lacked the C0, C1, and C2 domains abolished the calcium-dependent enhancement of ethanol's inhibition of NR1/2A receptors. Finally, the ethanol sensitivity of wild-type NR1/2A receptors measured in transfected HEK 293 cells by whole cell patch-clamp electrophysiology was significantly reduced by expression of the C-terminal truncated NR1 subunit. These results demonstrate that the ethanol sensitivity of certain NMDA receptors is modulated by an intracellular, calcium-dependent process that requires the C0 domain of the NR1 subunit." @default.
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- W2059968271 date "2002-11-13" @default.
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- W2059968271 title "Intracellular Calcium Enhances the Ethanol Sensitivity of NMDA Receptors Through an Interaction with the C0 Domain of the NR1 Subunit" @default.
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- W2059968271 doi "https://doi.org/10.1046/j.1471-4159.1998.71031095.x" @default.
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