Artículos de revistas
Antiinflammatory And Antiallodynic Actions Of The Lignan Niranthin Isolated From Phyllanthus Amarus. Evidence For Interaction With Platelet Activating Factor Receptor
Registro en:
European Journal Of Pharmacology. , v. 546, n. 01/03/15, p. 182 - 188, 2006.
142999
10.1016/j.ejphar.2006.07.025
2-s2.0-33748323234
Autor
Kassuya C.A.L.
Silvestre A.
Menezes-de-Lima Jr. O.
Marotta D.M.
Rehder V.L.G.
Calixto J.B.
Institución
Resumen
Previous studies have shown that the extracts obtained from Phyllanthus amarus, and some of the lignans isolated from it, exhibit pronounced antiinflammatory properties. In the present study, we have assessed whether the antiinflammatory actions of these lignans can be mediated by interaction with platelet activating factor (PAF) receptor or interference with the action of this lipid. The local administration of nirtetralin, phyltetralin or niranthin (30 nmol/paw), similar to WEB2170 (a PAF receptor antagonist, 30 nmol/paw), significantly inhibited PAF-induced paw oedema formation in mice. The extracts of P. amarus (100 μg/ml) and niranthin (30 μM), but not nirtetralin or phyltetralin (30 μM), decreased the specific binding of [3H]-PAF in mouse cerebral cortex membranes. Furthermore, both niranthin and WEB2170 displaced, in a concentration-dependent manner, the [3H]-PAF binding sites. The mean IC50 values from these effects were 6.5 μM and 0.3 μM, respectively. Additionally, both niranthin and WEB2170 (30 nmol/paw) inhibited the increase of myeloperoxidase activity induced by PAF injection in the mouse paw. When assessed the mouse model of pleurisy induced by PAF, pretreatment with niranthin (100 μmol/kg, p.o.) or WEB2170 (1.7 μmol/kg, i.p.) significantly inhibited PAF-induced protein extravasations. Moreover, in the rat model of PAF-induced allodynia, both niranthin (30 nmol/paw) and WEB2170 (30 nmol/paw) treatment significantly inhibited PAF-induced allodynia. In addition, niranthin had a rapid onset and long-lasting antiallodynic action when compared with WEB2170. Collectively, the present findings suggest that niranthin exhibits antiinflammatory and antiallodynic actions which are probably mediated through its direct antagonistic action on the PAF receptor binding sites. © 2006 Elsevier B.V. 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