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Major Depressive Disorder (MDD) is a highly disabling condition and has been linked to increased inflammatory mediators. Hydroalcoholic extract from barks of Rapanea ferruginea (HEBRF) and the majoritary compounds-myrsinoic acid A (MAA) and B (MAB)-have been studied due to their anti-inflammatory potential, but there is no evidence about its antidepressant-like effects. This research investigated the HEBRF, MAA, and MAB antidepressant-like effect, besides the involvement of the monoaminergic system and MAO-A activity in the HEBRF antidepressant-like effect. HEBRF (50-300 mg/kg, p.o.), MAA (5-30 mg/kg, p.o.) or MAB (3-60 mg/kg, p.o.) were administrated to mice, and behavioral parameters were assessed using the tail suspension test (TST), splash test (ST) and open field test (OFT). The involvement of monoaminergic system in the HEBRF antidepressant-like effect was established through the pretreatment of mice with antagonists. The influence triggered by HEBRF in the monoamine oxidase A (MAO-A) activity was evaluated in the hippocampus (HIP) and prefrontal cortex (PFC) of mice. HEBRF (100-300 mg/kg) promoted antidepressant-like effect in the TST and augmented the total time of grooming in the ST, without compromising the locomotor activity. Pretreatment of mice with serotoninergic, dopaminergic, and noradrenergic antagonists, reversed the HEBRF antidepressant-like effect. Besides, HEBRF inhibited the MAO-A activity in the HIP and PFC. Moreover, MAA (5 mg/kg) and MAB (3 mg/kg) also promoted antidepressant-like and anti-anhedonic effects in mice. Data showed that monoaminergic system is involved in the HEBRF antidepressant-like effect, besides MAA and MAB possibly could be responsible for these pharmacological effects.
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http://dx.doi.org/10.1016/j.bbr.2020.112601 | DOI Listing |
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