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• W2063332562 abstract "The evolution of excitatory amino acids-(EAA) stimulated inositol phosphates (IPs) turnover during postnatal development was investigated in synaptoneurosomes prepared from rat forebrains. The two main EAA agonists which induce the IPs synthesis were quisqualate (QA) and N-methyl-D-aspartate (NMDA). The QA and NMDA stimulations of IPs formation present a particular developmental pattern, characterized by an active phase during rat synaptogenesis. The QA-evoked IPs accumulation peaked in synaptoneurosomes prepared from 8-day-old rat forebrains while that evoked by NMDA peaked in synaptoneurosomes from 12-day-old rats. These two developmental patterns are specific of the EAA agonists since the other various neuroactive substances tested (carbachol (Carb), noradrenaline, and high concentrations of potassium) induced an IPs accumulation, which increases during development and reaches a maximum in synaptoneurosomes of adult animals. Aging leads to a decrease in the capability of EAAs and muscarinic agonists to stimulate IPs formation in synaptoneurosomes, whereas the stimulation of IPs turnover by noradrenaline remains constant. Taken together, these results suggest that EAAs play a key role during brain development by sequentially activating two receptor subtypes, a new QA receptor, and a NMDA receptor, linked to the phosphoinositide metabolism. They may also indicate that these EAA-induced IPs responses are related to neuronal plastic events, the amplitude of which decreases with aging." @default.
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• W2063332562 date "1989-01-01" @default.
• W2063332562 modified "2023-09-27" @default.
• W2063332562 title "Developmental changes in the chemosensitivity of rat brain synaptoneurosomes to excitatory amino acids, estimated by inositol phosphate formation" @default.
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• W2063332562 doi "https://doi.org/10.1016/0736-5748(89)90030-0" @default.
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