Title | A concise review of glutamatergic neurotransmission | |
Authors | Dragan R. Milovanovic, Slavica Djukic Dejanovic, Goran Mihajlovic and Slobodan M. Jankovic
Department of Pharmacology, Medical Faculty, University of Kragujevac, Serbia, Serbia and Montenegro |
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Citation | Milovanovic, D.R., Dejanovic, S.D., Mihajlovic, G., Jankovic, S.M.: A concise review of glutamatergic neurotransmission, Epitheorese Klin. Farmakol. Farmakokinet. 16(2): 125-136 (2002) | |
Publication Date | Received for publication: 28 March 2002
Accepted for publication: 1 June 2002 |
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Full Text Language | English | |
Order – Buy | Ηλεκτρονική Μορφή: pdf (10 €) – Digital Type: pdf (10 €)
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Keywords | Glutamate, receptors, ionotropic, metabotropic, transporters, synapse, drugs. | |
Other Terms | review article | |
Summary | This review describes the main facts about glutamatergic neurotransmission, in the framework of: history, glutamate synthetic pathways, glutamatergic synapse, glutamate receptors, their ligands, physiological and pathological role of glutamate in the body and therapeutic potential of glutamatergic mechanisms. Glutamate is principal excitatory neurotransmitter in the mammalian brain, but its role extends to peripheral nervous system and presumably peripheral tissues. Ionotropic glutamate receptors (iGluR) mediate most excitation evoked by glutamate and could be subclassified to NMDA (N-methyl-D-aspartate), AMPA (α-amino-3-hydroxy-5-methyl-4-isoxasolepropionic acid) and kainate receptors. They are transmembrane oligomers, permeable for cations. Metabotropic glutamate receptors belong to G-protein coupled receptors, have primarily modulatory roles and are classified as group I (mGluR1, mGluR5), group II (mGluR2, mGluR3) and group III receptors (mGluR4, mGluR6, mGluR7, mGluR8). In humans, there are five excitatory amino acid transporters (EAAT1-5), located in dense array on plasma membranes of glia and neurons. Spatial and temporal distribution of glutamate within nervous tissue is tightly maintained: glutamate concentrations are in cytosol 5-10mM, in synaptic vesicles 40-210mM, in extracellular space 0.6-10pM and in synaptic cleft (when synapse fires) biphasic, 3mM and 0.5-1 mM, respectively. Despite extraordinary efforts in research, many recent clinical trials with GluR ligands have failed, pointing to complexity of glutamatergic transmission. | |
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