Antinociceptive activity of Syzygium cumini leaves ethanol extract on orofacial nociception protocols in rodents

摘要

Context: Syzygium cumini (L.) Skeels (Myrtaceae) is a tree with dark purple fruits, popularly known as “jambol?o” or “jambolan”. In folk medicine, this plant is used for the treatment of diabetes and inflammatory conditions.Objective: We investigated the antinociceptive effect of ethanol extract (EE) from S. cumini leaves on orofacial nociception.Material and methods: The antinociceptive effects of the EE obtained from the leaves of S. cumini were evaluated in mice using formalin- and glutamate-induced orofacial nociception.Results: ESI-MS/MS analyses demonstrated that major constituents in the analyzed samples coincided with the mass of the phenolic acids and flavonoids. In pharmacological approach, pre-treatment with EE (100, 200, or 400?mg/kg, p.o.) significantly reduced (p?p?G-nitro- l -arginine ( l -NOARG). The extract, all doses, also caused a marked inhibition (p?p?Conclusions: We can suggest that the antinociceptive effect of the EE is mediated by peripheral mechanisms, possibly involving K_ATP channels and the nitric oxide pathways. These effects appear to be related to the presence of flavonoids compounds, such as quercetin.