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THE INFLUENCE OF SODIUM, POTASSIUM AND LANTHANUM ON AMINO ACID RELEASE FROM SPINAL–MEDULLARY SYNAPTOSOMES

Abstract— The effects of electrical pulses and raised potassium on glycolysis and the release of the putative transmitter amino acids glutamate, aspartate, glycine and GABA from spinal medullary synaptosomes is studied and compared with effects on glutamine, alanine and serine. The actions of ouabain, p‐hydroxymercuribenzoate (p‐HMB), lanthanum chloride and lowered sodium levels on the release of all the amino acids is examined. All agents caused a change in the pattern of release of the amino acids, mostly, producing an increase, but only lanthanum, p‐HMB and lowered sodium prevented the stimulus‐induced release.