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Disease-associated nonsense and frame-shift variants resulting in the truncation of the GluN2A or GluN2B C-terminal domain decrease NMDAR surface expression and reduce potentiating effects of neurosteroids

B. Kysilov, V. Kuchtiak, B. Hrcka Krausova, A. Balik, M. Korinek, K. Fili, M. Dobrovolski, V. Abramova, H. Chodounska, E. Kudova, P. Bozikova, J. Cerny, T. Smejkalova, L. Vyklicky

. 2024 ; 81 (1) : 36. [pub] 20240112

Jazyk angličtina Země Švýcarsko

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc24007591

Grantová podpora
23-04922S Grantová Agentura České Republiky
TN02000109 Technology Agency of the Czech Republic
PharmaBrain (No. CZ.02.1.01/0.0/0.0/16_025/0007444) European Regional Development Fund/ESF
RVO: 67985823 Czech Academy of Sciences
RVO 61388963 Czech Academy of Sciences
376221 Charles University Grant Agency
Biocev (CZ.1.05/1.1.00/02.0109) Ministry of Education, Youth and Sports of the Czech Republic

N-methyl-D-aspartate receptors (NMDARs) play a critical role in normal brain function, and variants in genes encoding NMDAR subunits have been described in individuals with various neuropsychiatric disorders. We have used whole-cell patch-clamp electrophysiology, fluorescence microscopy and in-silico modeling to explore the functional consequences of disease-associated nonsense and frame-shift variants resulting in the truncation of GluN2A or GluN2B C-terminal domain (CTD). This study characterizes variant NMDARs and shows their reduced surface expression and synaptic localization, altered agonist affinity, increased desensitization, and reduced probability of channel opening. We also show that naturally occurring and synthetic steroids pregnenolone sulfate and epipregnanolone butanoic acid, respectively, enhance NMDAR function in a way that is dependent on the length of the truncated CTD and, further, is steroid-specific, GluN2A/B subunit-specific, and GluN1 splice variant-specific. Adding to the previously described effects of disease-associated NMDAR variants on the receptor biogenesis and function, our results improve the understanding of the molecular consequences of NMDAR CTD truncations and provide an opportunity for the development of new therapeutic neurosteroid-based ligands.

Citace poskytuje Crossref.org

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