Please use this identifier to cite or link to this item:
|Title:||Crucial role of kainate receptors in mediating striatal kainate injection-induced decrease in acetylcholine M1receptor binding in rat forebrain|
|Authors:||Jin, S. |
|Citation:||Jin, S., Yang, J., Wong, P.T.H., Lee, W.L. (2000). Crucial role of kainate receptors in mediating striatal kainate injection-induced decrease in acetylcholine M1receptor binding in rat forebrain. Brain Research 882 (1-2) : 128-138. ScholarBank@NUS Repository. https://doi.org/10.1016/S0006-8993(00)02857-2|
|Abstract:||We investigated the roles of kainate-, α-amino-3-hydroxy-5-methylisoxazol-4-propionate (AMPA)- and N-methyl-d-aspartate (NMDA)-receptors in mediating striatal kainate injection-induced decrease in the binding of acetylcholine M1 receptors in rat forebrain. After unilateral intrastriatal injection of kainate (4 nmol), the bindings of [3H]kainate (10 nM), [3H]MK-801 (4 nM) and [3H]pirenzepine (4 nM) to the rat ipsilateral forebrain membranes declined, reaching the lowest on day 2 to 4 and recovering on day 8. Saturation binding studies, performed on day 2 post-injection, showed that kainate (1, 2, 4 nmol) dose-dependently decreased B(max) and K(d) of the three ligands. (+)-5-Methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5,10-imine (MK-801), a selective NMDA receptor channel blocker, antagonised (from a dose of 4 nmol) kainate-induced decreases in the bindings of [3H]kainate (up to ~20%), [3H]MK-801 (up to ~90%) and [3H]pirenzepine (up to ~70%). In contrast, 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX), a selective non-NMDA receptor antagonist, almost completely abolished (from a dose of 12 nmol) kainate-induced decreases in the bindings of all the three ligands (up to ~95-98%). Cyclothiazide, a selective potentiator that enhances AMPA receptor-mediated responses, significantly enhanced (from a dose of 4 nmol) kainate-induced decrease in the binding of [3H]kainate but not that of [3H]pirenzepine or [3H]MK-801. In summary, these results indicate that striatal kainate injection-induced decrease in the binding of acetylcholine M1 receptors in rat forebrain is dependent on activation of kainate receptors and, to a certain extent, a consequent involvement of NMDA receptors. These and previous studies provide some evidence showing that kainate receptors might play a crucial role in regulating excitatory amino acids (EAA)-modulated cholinergic neurotransmission in the central nervous system (CNS). (C) 2000 Elsevier Science B.V.|
|Source Title:||Brain Research|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 11, 2018
WEB OF SCIENCETM
checked on Jul 11, 2018
checked on Jun 2, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.