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The Effect of Endogenous Modulator Endobain E on NMDA Receptor Is Interfered by Zn22+ but Is Independent of Modulation by Spermidine

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Abstract

A brain endogenous factor, termed endobain E, allosterically decreases [3H]dizocilpine binding to NMDA receptor. Such effect depends on receptor activation by the coagonists glutamate and glycine and is interfered by channel blockers, suggesting its interaction with the inner surface of the associated channel. To further analyze endobain E effect on NMDA receptor, in the current study competitive [3H]dizocilpine binding assays to brain membranes were performed with Zn2+ to block the associated channel, as well as with spermidine (SPD), which exerts positive allosteric modulation of NMDA receptor. Partially or nonadditive effects on [3H]dizocilpine binding were recorded, respectively, in the presence of endobain E at a concentration that inhibits binding 25% plus IC25 Zn2+ or endobain E at a concentration that inhibits binding 50% plus IC50 Zn2+. With an endobain E concentration that decreases 25% ligand binding, SPD potentiated binding over a wide concentration range but failed to modify endobain E effect. Similarly, [3H]dizocilpine binding reduction over a wide endobain E concentration range remained unaltered by high SPD concentrations. Additive effects were observed with endobain E at a concentration that decreases binding 25% plus IC25 SPD site antagonists arcaine or ifenprodil. Zn2+ experiments indicated that endobain E effect is interfered by channel blockade produced by this ion. Although endobain E effect is dependent on NMDA receptor activation by glutamate and glycine, it proves independent of the positive modulation exerted by SPD. Thus the endogenous modulator seems not to interact at NMDA receptor polyamine site, favoring the hypothesis that endobain E binds inside the associated channel.

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Correspondence to G. Rodríguez de Lores Arnaiz.

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Reinés, A., Zárate, S., Peña, C. et al. The Effect of Endogenous Modulator Endobain E on NMDA Receptor Is Interfered by Zn22+ but Is Independent of Modulation by Spermidine. Neurochem Res 29, 819–825 (2004). https://doi.org/10.1023/B:NERE.0000018856.99773.71

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  • DOI: https://doi.org/10.1023/B:NERE.0000018856.99773.71

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