Journal
NEUROSCIENCE LETTERS
Volume 660, Issue -, Pages 79-85Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.neulet.2017.09.010
Keywords
Passiflora edulis; Antidepressants; Forced swimming test; Mouse; Serotonin; Dopamine
Categories
Funding
- CNPq/Brazil [302302/2015-8]
- CAPES/Brazil
- CNPq/Brazil
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The genus Passiflora is popularly used to treat anxiety. Recent studies showed antidepressant-like effects of two varieties of P. edulis (edulis and fiavicarpa) in mice. However, the mechanisms of antidepressant actions are still unknown. Here, the effects of P. edulis fo. edulis aqueous extract (AE, 100-300 mg/kg, po), and ethyl acetate (AcOEt, 25-50 mg/kg, po), butanol (BuOH, 25-50 mg/kg, po) and residual aqueous (25-100 mg/kg, po) fractions were investigated in the mouse forced swimming test. In addition, the involvement of monoamines in the P. edulis fractions-induced antidepressant actions was approached. HPLC analyses showed that AcOEt and BuOH, but not residual, fractions shared with AE the main peaks between 25 and 70 min (UV 340 nm), which are suggestive of flavonoids. Nortriptyline and fluoxetine reduced the immobility time and similar results were observed for AE, AcOEt and BuOH but not residual fractions. PCPA (inhibitor of 5-HT synthesis), AMPT (inhibitor of catecholamine synthesis) and sulpiride (selective D2 receptor antagonist), but not DSP-4 (nora-drenergic neurotoxin), blocked the antidepressant actions of AcOEt and BuOH. In conclusion, AcOEt and BuOH fractions shared with AE similar phytochemical composition and antidepressant actions. Preserved 5-HT and dopamine transmissions were required for the antidepressant effects of P. edulis fractions.
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