title: [The sites of high affinity binding of L-[3H]glutamic acid in human platelets. A new type of platelet receptor?].
abstract: The total membrane fraction of human platelets was found to contain high affinity sites of L-[3H]glutamic acid binding (Kd = 100 nM, Bmax = 1.06 pmol/mg protein). The pH optimum for binding is at pH approximately 6.9 Na+ (1-150 mM) inhibit glutamate binding by platelet membranes (IC50 = 12 mM). Ca2+ (50-100 microM) stimulate the binding by 10-20% and inhibit it by 20-30% at concentrations of 1-5 mM. Monoclonal antibodies to the glutamate receptor strongly suppress the L-[3H]glutamate binding by platelet membranes (IC50 = 300 nm). The presence in human platelets of a glutamate-sensitive receptor complex similar to the central nervous system glutamate receptor is postulated.
mesh_terms: D001667:Binding, Competitive; D001792:Blood Platelets / Q000378:metabolism*; D005971:Glutamates / Q000378:metabolism*; D018698:Glutamic Acid; D006801:Humans; D007700:Kinetics; D017470:Receptors, Glutamate; D017981:Receptors, Neurotransmitter / Q000187:drug effects / Q000378:metabolism*
chemical_list: D005971:Glutamates; D017470:Receptors, Glutamate; D017981:Receptors, Neurotransmitter; D018698:Glutamic Acid
vernacular_title: Uchastki vysokoaffinnogo sviazyvaniia L-[3H]glutaminovoĭ kisloty v trombotsitakh cheloveka. Novyĭ tip trombotsitarnogo retseptora?