TAAR1 as a new target for the treatment of bipolar disorder: Anti-manic and anti-depressant activity of the novel agonist PCC0105004
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Abstract
Background: Bipolar disorder (BD) is a deleterious psychiatric disorder, and the available pharmacotherapies have limited efficacy with significant side effects. Trace amine-associated receptor 1 (TAAR1) is an emerging drug target for neuropsychiatric disorders such as schizophrenia and substance user disorders. However, it is unknown whether TAAR1 is involved in the pathogenesis of BD. This study examined the effects and underlying mechanisms of a novel TAAR1 agonist, PCC0105004, in a rat model of ouabain (OUA)-induced BD.
Methods: Intracerebroventricular (ICV) administration of OUA-induced BD model was established. The in vitro cell-based cAMP assay was used to examine TAAR1 agonism of PCC0105004. The receptor specificity of PCC0105004 was determined by an off-target panel assay that included radioligand binding and enzymatic assays. The effects of PCC0105004 on manic-like and depressive-like behaviors were evaluated in the rat BD model. TAAR1-mediated signaling and oxidative stress parameters were biochemically determined in the prefrontal cortex and the hippocampus of rats.
Results: Western blotting revealed reduced TAAR1 expression level in the prefrontal cortex but unchanged in the hippocampus in model rats. PCC0105004, a TAAR1 agonist with the agonism EC50 value of 0.06182 μM, attenuated the manic-like behaviors on the 7th day and the depressive-like behaviors on the 14th day at doses that did not affect locomotor activity in the BD rats. Mechanistically, PCC0105004 exerted its behavioral effects via the reduction of ROS damage through the phosphorylation activation of the TAAR1/Akt/GSK3β/BDNF signaling pathway.
Conclusion: These results demonstrated the potential antimanic-like and antidepressant-like efficacy of a novel TAAR1 agonist PCC0105004 in rats and revealed its underlying molecular basis, which supports the possibility of TAAR1 agonists as candidate pharmacotherapeutics for BD.
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