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Neuron. 1990 May;4(5):725-31.

Glycine-insensitive desensitization of NMDA responses in cultured mouse embryonic neurons.

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  • 1Laboratoire de Neurobiologie, Ecole Normale SupĂ©rieure, Paris, France.


The influence of glycine on the desensitization of NMDA-induced currents was studied using cultured embryonic mouse neurons. Although glycine often appeared to reduce desensitization in the whole-cell mode, it had no effect on desensitization in outside-out patches. Various interpretations can be proposed for this discrepancy, such as the presence in intact cells of an intracellular factor regulating desensitization, or the masking of desensitization in intact cells by restricted diffusion of the agonist in the extracellular space. The fact that glycine potentiates the NMDA responses under conditions where it does not regulate desensitization indicates that the potentiation cannot be explained by a reduction of desensitization.

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