Positive allosteric modulation of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid glutamate receptors differentially modulates the behavioural effects of citalopram in mouse models of antidepressant and anxiolytic action.

Abstract:

:Drugs that increase monoamine neurotransmission are effective in both anxiety and depression. The therapeutic effects of monoamine-based antidepressant drugs may involve indirect effects on neurotransmission through α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid glutamate receptors (AMPAR). Thus, chronic antidepressant treatment increases AMPAR-mediated neurotransmission and AMPAR-positive allosteric modulators have shown antidepressant-like efficacy in rodents. Here, the effect of enhanced AMPAR neurotransmission on the antidepressant-like and anxiolytic-like actions of the selective serotonin reuptake inhibitor citalopram (0-10 mg/kg) was investigated in mice using the AMPAR-positive allosteric modulator LY451646 (0-3 mg/kg). Antidepressant-like effects were assessed using the forced-swim test (FST), whereas anxiolytic-like effects were tested using the elevated zero maze (EZM) and the marble burying test. LY451646 (3 mg/kg) increased swim distance in the FST and a subactive dose of LY451646 (1 mg/kg) enhanced the effect of citalopram in the FST. In the EZM, LY451646 (3 mg/kg) did not show anxiogenic effects alone, but blocked the anxiolytic-like action of citalopram in the EZM, as reflected by an increase in the latency to enter the open areas and a decrease in the number of entries and time spent in the open areas in citalopram-treated mice. In the marble burying test, LY451646 (3 mg/kg) showed no effect alone, but significantly attenuated the anxiolytic-like effect of citalopram (1.25-2.5 mg/kg) by increasing the number of marbles buried in citalopram-treated mice. These results suggest that AMPAR neurotransmission plays opposite roles in anxiety and depression as AMPAR potentiation facilitated the antidepressant-like effects of citalopram while attenuating its anxiolytic-like effect. These findings have ramifications in the search for AMPAR-based novel anxiolytic and antidepressant treatments.

journal_name

Behav Pharmacol

journal_title

Behavioural pharmacology

authors

Fitzpatrick CM,Larsen M,Madsen LH,Caballero-Puntiverio M,Pickering DS,Clausen RP,Andreasen JT

doi

10.1097/FBP.0000000000000243

subject

Has Abstract

pub_date

2016-09-01 00:00:00

pages

549-55

issue

6

eissn

0955-8810

issn

1473-5849

journal_volume

27

pub_type

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