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pubmed-article:1709478pubmed:abstractTextAddition of adenosine deaminase to cultured cerebellar neurones, led to large increases in the influx of 45Ca2+ and hydrolysis of polyphosphoinositide. These effects were inhibited or attenuated by glutamate receptor antagonists (AP5 or MK-801) and were not observed in cells stimulated by maximum concentrations of glutamate or quisqualate. Stimulation of the influx of 45Ca2+ and hydrolysis of phosphoinositide by adenosine deaminase may be secondary to an enhanced release of endogenous glutamate that in turn activates specific excitatory amino acid receptors. Accordingly, adenosine deaminase potently increased release of D-[3H]aspartate, an effect that requires the presence of extracellular Na+ and is insensitive to inhibition by MK-801. None of the effects of adenosine deaminase may be simply related to a fall in endogenous adenosine. In fact, the action of adenosine deaminase was neither reversed by agonists (L-PIA or NECA), nor mimicked by antagonists (IBMX or theophylline) of adenosine receptors. It is speculated that adenosine deaminase stimulates release of neurotransmitter through a mechanism independent of depletion of adenosine. A possible direct action of adenosine deaminase should be taken into account when the enzyme is used to unmask the effects of endogenous adenosine.lld:pubmed
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pubmed-article:1709478pubmed:articleTitleAdenosine deaminase increases release of excitatory amino acids through a mechanism independent of adenosine depletion.lld:pubmed
pubmed-article:1709478pubmed:affiliationInstitute of Pharmacology, University of Catania, School of Medicine, Italy.lld:pubmed
pubmed-article:1709478pubmed:publicationTypeJournal Articlelld:pubmed