Research

Cyclothiazide unmasks an AMPA-evoked release of arachidonic acid from cultured striatal neurones


Reference:

Williams, R. J. and Glowinski, J., 1996. Cyclothiazide unmasks an AMPA-evoked release of arachidonic acid from cultured striatal neurones. Journal of Neurochemistry, 67 (4), pp. 1551-1558.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below.

Official URL:

http://dx.doi.org/10.1046/j.1471-4159.1996.67041551.x

Abstract

The joint, but not independent, activation of alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA) and metabotropic glutamate receptors induces liberation of arachidonic acid from cultured mouse striatal neurones. We examined whether blocking AMPA receptor desensitisation with cyclothiazide would modify this response. Cyclothiazide strongly potentiated the combined AMPA/(1 S,3R)-1-aminocyclopentane-1,3-dicarboxylic acid (ACPD)-evoked release of arachidonic acid (EC50 of approximately 7 microM) but did not modulate the basal, ACPD, or NMDA response. The enhanced liberation of arachidonic acid, observed in the presence of cyclothiazide, was due to the appearance of a genuine AMPA response that was independent of an associative activation of metabotropic receptors. The potentiated and nonpotentiated AMPA responses were inhibited by both competitive [2,3-di-hydroxy-6-nitro-7-sulphamoylbenzo (f) quinoxaline] and 2,3-benzodiazepine noncompetitive (GYKI 53655 and GYKI 52466) receptor antagonists. Cyclothiazide was equally effective at potentiating the AMPA response in either the presence or absence of glucose, suggesting that the increased glutamate-evoked arachidonic acid release observed in these cells under conditions of glucose deprivation is not due to reduced AMPA receptor desensitisation. The enhanced liberation of arachidonic acid measured in the presence of cyclothiazide appeared to result from a large (fourfold) elevation of the AMPA-induced increase in intracellular calcium level. Therefore, an AMPA-evoked mobilisation of arachidonic acid could potentially contribute to non-NMDA receptor-mediated neurotoxicity, which has been observed in neuronal cells in the presence of cyclothiazide.

Details

Item Type Articles
CreatorsWilliams, R. J.and Glowinski, J.
DOI10.1046/j.1471-4159.1996.67041551.x
DepartmentsFaculty of Science > Biology & Biochemistry
RefereedYes
StatusPublished
ID Code30561

Export

Actions (login required)

View Item