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• W1978222372 abstract "The aim of this study was to determine whether L-glutamate, a major excitatory transmitter in the cerebral cortex, modulates the proteolytic cleavage of the amyloid precursor protein (APP) in the brain through specific receptor activation. Native rat brain cerebral cortical slices were stimulated either with L-glutamate or various glutamate receptor agonists, and the soluble APP derivatives released into the incubation medium were assayed by Western blot analysis. Immunoprecipitation with specific antibodies revealed that in the medium only secretory forms of APP lacking intact C-terminus were present, whereas in the brain slices both C- and N-terminal intact APP products were detectable. L-glutamate induced the release of secretory APP from cortical slices in a concentration-dependent but biphasic manner, with the highest release at 50 μM L-glutamate and smaller effects at higher glutamate concentrations. To determine whether the effect of L-glutamate is mediated through distinct glutamate receptor subtypes, brain slices were incubated in the presence of various specific glutamate receptor agonists. Activation of the alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid (AMPA) receptor with 50 nM (RS)-bromohomoibotenic acid resulted in a reduced release of secretory APP by 17%±3 (P<0.01, one tailed Student's t-test) compared to the incubation without any drug. Stimulation of the metabotropic glutamate receptor with 50 nM (2S,3S,4S)-α-(carboxycyclopropyl)-glycine (L-CCG-I) led to an enhanced release of secretory APP by 39%±3 (P<0.001), whereas activation of the N-methyl-D-aspartate (NMDA) receptor with 50 nM (1R,3R)-1-aminocyclopentane-1,3-dicarboxylic acid ((1R,3R)-ACPD) did not significantly change the secretion of APP compared to the incubation without any drug. The data suggest that: (i) cortical glutamatergic neurotransmission is involved in APP metabolism; and (ii) the stimulation of APP cleavage in cerebral cortical brain slices is mainly mediated by the metabotropic but not the NMDA glutamate receptor subtype, whereas the AMPA receptor subtype seems to inhibit the secretory path of APP processing." @default.
• W1978222372 created "2016-06-24" @default.
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• W1978222372 date "1997-06-07" @default.
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• W1978222372 title "Glutamate-stimulated secretion of amyloid precursor protein from cortical rat brain slices" @default.
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• W1978222372 doi "https://doi.org/10.1016/s0197-0186(96)00119-2" @default.
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