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Topiramate modulation of kainate-induced calcium currents is inversely related to channel phosphorylation level.

Abstract：

:Topiramate (TPM) is a structurally novel broad-spectrum anticonvulsant known to modulate the activity of several ligand- and voltage-gated ion channels in neurons. These include an inhibitory effect on the AMPA and kainate subtypes of glutamate receptors, mixed modulatory effects (usually positive) on some types of GABAA receptors, negative modulatory effects on some types of voltage-gated Na+ and Ca2+ channels, and a positive modulatory effect on at least one type of K+ channel. The nature of these effects at the molecular level has not been established, but two previous studies have implicated the phosphorylation state of these receptor/channel complexes as an influencing factor in the activity of TPM. Here, we report that the ability of TPM to inhibit a kainate-induced accumulation of free Ca2+ in cultured neurons from rat cerebral cortex is inversely related to the level of cAMP-dependent protein kinase (cAPK) mediated phosphorylation of kainate-activated receptors/channels. Specifically, when cell cultures were pre-treated with forskolin or dibutyryl cAMP, indirect activators of cAPK, the activity of TPM was abolished, whereas when the cells were pre-treated with H89, an inhibitor of cAPK, the relative activity of TPM was enhanced. The results of this study support the hypothesis that TPM binds to phosphorylation sites on AMPA and kainate receptors, but only in the dephosphorylated state and thereby exerts an allosteric modulatory effect on channel conductance.

journal_name

J Neurochem

journal_title

Journal of neurochemistry

authors

Angehagen M,Ben-Menachem E,Shank R,Rönnbäck L,Hansson E

doi

10.1046/j.1471-4159.2003.02186.x

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

320-5

issue

2

eissn

0022-3042

issn

1471-4159

pii

2186

journal_volume

88

pub_type

杂志文章

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