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  • glutamyl peptides  (1)
  • 1
    ISSN: 1573-6903
    Keywords: Neurotransmission ; excitatory amino acids ; receptors ; ligand binding ; glutamyl peptides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A number ofD-glutamyl andL-aspartyl dipeptides, glutathione, γ-D-glutamylglycine and γ-D-glutamyltaurine, were tested for their efficacy to displace ligands specific for different subtypes of excitatory amino acid receptors from rat brain synaptic membranes. In general, theL enanthiomorphs of γ-glutamyl peptides were more potent displacers than γ-D-glutamylglycine and-taurine but the latter were more specific for the quisqualate type of receptors. γ-L-glutamyl-L-glutamate was the most effective dipeptide in displacing the binding of glutamate, 2-amino-3-hydroxy-5-methylisoxazole-4-proprionate (AMPA) and 2-amino-5-phosphonoheptanoate (APH), whereas γ-L-glutamyl-L-aspartate was the most effective in the binding of kainate. Both oxidized and reduced glutathione were inhibitory, being most potent in the binding of AMPA. γ-L-Glutamylaminomethylsulphonate was most effective in the binding of APH. The most potent γ-L-glutamyl peptides (glutathione, γ-L-glutamyl-L-glutamate,-L-aspartate, and-glycine) may act as endogenous modulators of excitatory aminoacidergic neurotransmission.
    Type of Medium: Electronic Resource
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