Journal
PROGRESS IN NEURO-PSYCHOPHARMACOLOGY & BIOLOGICAL PSYCHIATRY
Volume 108, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pnpbp.2020.110156
Keywords
Lysophosphatidic acid receptor; Emotional behavior; Working memory; Adult hippocampal neurogenesis; C-Fos; -CaMKII
Funding
- Spanish Ministry of Science, Innovation and Universities
- European Regional Development Fund (ERDF, EU) [PSI2017-82604R, PSI2017-83408-P, PI16/01510]
- Andalusian Regional Ministry of Economy, Knowledge, Business and University [CTS643]
- Andalusian Regional Ministry of Health and Families (Nicolas Monardes Programme)
- IBIMA
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The chronic modulation of the LPA/LPA receptors-signaling pathway in the brain plays a crucial role in regulating cognition and emotion, particularly through hippocampal-dependent mechanisms. Chronic C18:1 LPA infusion leads to antidepressant effects, improved memory, and enhanced hippocampal neurogenesis, while LPA(1-3) receptor antagonist disrupts memory and induces anxiety and depression-like behaviors.
Several studies have demonstrated that lysophosphatidic acid (LPA) acts through its LPA receptors in multiple biological and behavioral processes, including adult hippocampal neurogenesis, hippocampal-dependent mem-ory, and emotional regulation. However, analyses of the effects have typically involved acute treatments, and there is no information available regarding the effect of the chronic pharmacological modulation of the LPA/LPA receptors-signaling pathway. Thus, we analyzed the effect of the chronic (21 days) and continuous intra-cerebroventricular (ICV) infusion of C18:1 LPA and the LPA(1-3) receptor antagonist Ki16425 in behavior and adult hippocampal neurogenesis. Twenty-one days after continuous ICV infusions, mouse behaviors in the open field test, Y-maze test and forced swimming test were assessed. In addition, the hippocampus was examined for c-Fos expression and alpha-CaMKII and phospho-alpha-CaMKII levels. The current study demonstrates that chronic C18:1 LPA produced antidepressant effects, improved spatial working memory, and enhanced adult hippocampal neurogenesis. In contrast, chronic LPA(1-3) receptor antago-nism disrupted exploratory activity and spatial working memory, induced anxiety and depression-like behaviors and produced an impairment of hippocampal neurogenesis. While these effects were accompanied by an increase in neuronal activation in the DG of C18:1 LPA-treated mice, Ki16425-treated mice showed reduced neuronal activation in CA3 and CA1 hippocampal subfields. Treatment with the antagonist also induced an imbalance in the expression of basal/activated alpha-CaMKII protein forms. These outcomes indicate that the chronic central modulation of the LPA receptors-signaling pathway in the brain regulates cognition and emotion, likely comprising hippocampal-dependent mechanisms. The use of pharmacological modulation of this pathway in the brain may potentially be targeted for the treatment of several neuropsychiatric conditions.
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