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  • Title: The excitation of frog motoneurones in vitro by the glutamate analogue, DI-alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA), and the effect of amino acid antagonists.
    Author: King AE, Nistri A, Rovira C.
    Journal: Neurosci Lett; 1985 Mar 22; 55(1):77-82. PubMed ID: 2859566.
    Abstract:
    Intracellular recordings were made from motoneurones of the frog spinal cord in vitro and the excitatory effects of the glutamate analogue DL-alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) examined. AMPA (25-100 microM) depolarized motoneurones with an increase in input conductance and an increase in spontaneous cell firing. The time-course of the AMPA response was prolonged compared to L-glutamate. D-Aminophosphonovalerate (1 microM) and D-aminoadipate (100 microM) did not antagonize AMPA-induced excitations while depressing L-glutamate responses. Glutamate diethylester up to 1 mM was not found to be a useful amino acid antagonist since it did not significantly reduce the depolarizations to quisqualate, L-glutamate and AMPA. The results are compatible with an action of AMPA on receptors distinct from those to N-methyl-D-aspartate and shared by quisqualate.
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