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Antidepressant-dependent mRNA changes in mouse associated with hippocampal neurogenesis in a mouse model of depression

Malki, K and Lourdusamy, A and Binder, E and Payá-Cano, J and Sluyter, F and Craig, I and Keers, R and McGuffin, P and Uher, R and Schalkwyk, LC (2012) 'Antidepressant-dependent mRNA changes in mouse associated with hippocampal neurogenesis in a mouse model of depression.' Pharmacogenetics and Genomics, 22 (11). 765 - 776. ISSN 1744-6872

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RATIONALE: Monoaminergic imbalances play a role in the pathogenesis of depression and most common antidepressant drugs act on monoamine neurotransmitters. However, the lag time between restoring neurochemical balance and symptom improvement suggests that the response to drugs involves complex biological events downstream of primary targets that have not yet been fully characterized. Here, we report a mouse mRNA expression study to evaluate the effect of escitalopram (a serotonergic antidepressant) and nortriptyline (a noradrenergic antidepressant) on genes that are involved in the pathogenesis of depression and to assess the similarities and differences between two drugs on gene expression levels. METHODS: Genome-wide RNA expression data from the hippocampal tissues of four inbred mouse strains (129S1/SvlmJ, C57LB/6J, DBA/2J and FVB/NJ) were treated with varying doses of either nortriptyline (NRI) or escitalopram (SSRI) and subjected to two different depressogenic protocols. Following robust multichip average normalization, we applied the nonparametric RankProd approach to identify differentially expressed genes in response to drugs across the four strains. Pathway analysis was subsequently carried out on top-ranking genes to gain further biological insights. RESULTS: A total of 371 genes were significantly differentially expressed in response to nortriptyline, whereas 383 were altered by escitalopram. Genes involved in the pathways of integrin signalling (Fnlb, Mapk1, Mapk8), synaptic transmission (Cacnb1, Dnajc5, Kcnma1, Slc1a2) or Huntington disease (Crebbp, Dlg4, Ncor1) were altered by both nortriptyline and escitalopram. Several biological processes and pathways were identified, which could explain the divergence between the molecular mechanisms of nortriptyline and escitalopram. CONCLUSION: From a large-scale animal study, we obtain gene sets comprised of commonly and differentially expressed genes in response to different antidepressant drug treatments. The results may help to characterize the response to antidepressant treatment, shed further light on the neurobiology of depressive disorders and inform future animal and human studies. Finally, the top-ranking pathways from Ingenuity provide further evidence for the hippocampal neurogenesis hypothesis of major depressive disorders. © 2012 Wolters Kluwer Health | Lippincott Williams & Wilkins.

Item Type: Article
Subjects: Q Science > QH Natural history > QH426 Genetics
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 11 Nov 2014 10:36
Last Modified: 15 Sep 2020 10:15

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