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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Study of neurosteroid effect on the NMDA subtype of glutamate receptor.
 Krausová, Barbora ; Vyklický, Ladislav (advisor) ; Bendová, Zdeňka (referee)
N-methyl-D-aspartate (NMDA) receptors are glutamatergic ionotropic receptors involved in excitatory synaptic transmission, synaptic plasticity and excitotoxicity. They are heteromeric complexes of GluN1 combined with GluN2A-D and/or GluN3A-B subunits that are activated by glutamate and glycine. Many allosteric modulators can influence the activity of these receptors including neurosteroids. Pregnanolone sulfáte (3α5βS) is an endogenous neurosteroid that inhibits NMDA receptors in a use-dependent manner and has neuroprotective effect. Binding site for 3α5βS on the NMDA receptor molecule is still not indentified. The aim of my work was to contribute to the identification of the biding site by kinetic analysis of rate of response return from 3α5βS inhibition. Using the point mutation we also attempted to identify the amino acids residues that could be involved in the neurosteroid binding. In order to study the effect of 3α5βS on NMDA receptors the electropfysiological recordings on human embryonic kidney 293T cells expressing recombinant GluN1/GluN2B receptors was performed. We confirm that the effect of 3α5βS on GluN1/GluN2B receptors is voltage-independent. The results of my work indicate that steroids can reach the binding site on the NMDA receptors through the membrane rather than directly from the aqueous...
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