Perinatal exposure to fluoxetine increases anxiety- and depressive-like behaviours and alters glutamatergic markers in the prefrontal cortex and hippocampus of male adolescent rats: A comparison between Sprague-Dawley rats and the Wistar-Kyoto rat model of depression

Journal article

Millard, Samuel J., Lum, Jeremy Stephen, Fernandez, Francesca, Weston-Green, Katrina and Newell, Kelly A.. (2019). Perinatal exposure to fluoxetine increases anxiety- and depressive-like behaviours and alters glutamatergic markers in the prefrontal cortex and hippocampus of male adolescent rats: A comparison between Sprague-Dawley rats and the Wistar-Kyoto rat model of depression. Journal of Psychopharmacology. 33(2), pp. 230 - 243. https://doi.org/10.1177/0269881118822141
AuthorsMillard, Samuel J., Lum, Jeremy Stephen, Fernandez, Francesca, Weston-Green, Katrina and Newell, Kelly A.
Abstract

Background:
With approximately 10% of pregnant women prescribed antidepressant drugs for the treatment of depressive disorders, there is growing concern regarding the potential long-term effects of this exposure on offspring. Research is needed in clinically relevant models to determine the effects on offspring behaviour and associated neurobiological systems.
Aim:
The aim of this study was to determine the effects of maternal fluoxetine treatment on anxiety-like and depressive-like behaviours in adolescent offspring as well as associated glutamatergic markers, using a clinically relevant rodent model of depression.
Methods:
Wistar-Kyoto (model of innate depression) and Sprague-Dawley rats were treated with fluoxetine (10 mg/kg) from gestational day 0 to postnatal day 14. Male offspring underwent behavioural testing (open field, elevated plus maze, forced swim test) at adolescence followed by quantitative immuno-detection of glutamatergic markers in the prefrontal cortex and ventral hippocampus.
Results:
Perinatal fluoxetine exposure exacerbated the anxiety-like and depressive-like phenotype in Wistar-Kyoto offspring and induced an anxiety-like and depressive-like phenotype in Sprague-Dawley offspring. Wistar-Kyoto offspring showed reductions in NMDA receptor NR1, NR2A and NR2B subunits, as well as post-synaptic density 95 (PSD-95) and metabotropic glutamate receptor subtype 1 (mGluR1) in the prefrontal cortex; perinatal fluoxetine exposure further reduced NR1, NR2A, PSD-95 and mGluR1 expression in Wistar-Kyoto as well as Sprague-Dawley offspring. In the ventral hippocampus perinatal fluoxetine exposure reduced PSD-95 and increased metabotropic glutamate receptor subtype 5 (mGluR5) and Homer1b/c in both Sprague-Dawley and Wistar-Kyoto strains.
Conclusion:
These findings suggest that maternal fluoxetine treatment exacerbates effects of underlying maternal depression on offspring behaviour, which may be mediated through alterations in the glutamatergic system. Further research investigating how to minimise these effects, whilst ensuring optimal treatment for mothers, is essential to move the field forward.

KeywordsMaternal depression; offspring; perinatal selective serotonin reuptake inhibitor; fluoxetine; antidepressant; Wistar-Kyoto; glutamate; N-methyl-D-aspartate receptor; metabotropic glutamate receptor; post-synaptic density 95
Year2019
JournalJournal of Psychopharmacology
Journal citation33 (2), pp. 230 - 243
PublisherSage Publications Ltd.
ISSN0269-8811
Digital Object Identifier (DOI)https://doi.org/10.1177/0269881118822141
Scopus EID2-s2.0-85060933915
Page range230 - 243
Research GroupSchool of Behavioural and Health Sciences
Publisher's version
File Access Level
Controlled
Place of publicationUnited Kingdom
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