Evidence for the Activity of Lamotrigine at 5-HT(1A) Receptors in the Mouse Forced Swimming Test

Overview

Journal J Psychiatry Neurosci

Specialty Psychiatry

Date 2005 Jul 29

PMID 16049571

Citations 15

Authors

Michel Bourin

Fabienne Masse

Martine Hascoet

Affiliations

Soon will be listed here.

Abstract

Background: The antiepileptic drug lamotrigine is effective in the treatment of focal epilepsies. It is thought to act by inhibition of glutamate release through blockade of voltage-sensitive sodium channels and stabilization of the neuronal membrane. Lamotrigine is also effective in the treatment of mood disorders such as bipolar disorder. However, its exact mechanism of action in these conditions remains unclear. The aim of the present study was to evaluate the antidepressant-like effect of lamotrigine in a mouse model of depression, namely the forced swimming test (FST). Association studies using specific and nonspecific ligands acting on serotonin (5-hydroxytryptamine; 5-HT1) receptor subtypes were undertaken to evaluate the potential role of these receptors in the anti-immobility effect of lamotrigine.

Methods: The mouse FST was performed after single administration of lamotrigine. Subactive doses of lamotrigine were administered in association with subactive doses of the following 5-HT1 receptor agonists or antagonists: 8-hydroxy-2-(di-n-propilamino)-tetralin (8-OH-DPAT, a standard 5-HT(1A) receptor selective agonist), pindolol (a presynaptic and postsynaptic 5-HT(1A/1B) receptor antagonist), NAN-190 (a 5-HT(1A) receptor antagonist), RU 24969 (a 5-HT(1A/1B) receptor agonist) and anpirtoline (5-HT(1B) agonist).

Results: Lamotrigine impaired spontaneous locomotor activity at doses of 4 mg/kg or greater, and activity decreased by more than 50% at the 16 mg/kg dose. When administered alone, lamotrigine (8 and 16 mg/kg) decreased immobility time in the FST. Only 8-OH-DPAT (1 mg/kg), pindolol (32 mg/kg) and RU 24969 (0.5 mg/kg) enhanced the antidepressant-like effect of lamotrigine in the FST.

Conclusions: These results suggest that postsynaptic 5-HT(1A) receptors might be involved in the activity of lamotrigine. Furthermore, they demonstrate that lamotrigine more closely resembles valproate and carbamazepine than lithium, with the advantage of an anti-immobility effect in the mouse FST when administered on its own.

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