Antinociceptive and anti-inflammatory kaempferol glycosides from Sedum dendroideum

Aim of the studyTo identify the compounds responsible for the antinociceptive and anti-inflammatory effects previously described for Sedum dendroideum, through bioassay-guided fractionation procedures.Materials and methodsAntinociceptive activity was evaluated through mouse acetic acid-induced writhing model. The anti-inflammatory activity was assessed through croton oil-induced mouse ear oedema and carrageenan-induced peritonitis.ResultsThe Sedum dendroideum juice afforded seven known flavonoids identified with basis on NMR data. The oral administration of the major kaempferol glycosides kaempferitrin [1] (17.29 μmol/kg), kaempferol 3-O-β-glucopyranoside-7-O-α-rhamnopyranoside [2] (16.82 μmol/kg), kaempferol 3-O-neohesperidoside-7-O-α-rhamnopyranoside [3] (13.50 μmol/kg) or α-rhamnoisorobin [5] (23.13 μmol/kg) inhibited by 47.3%, 25.7%, 60.2% and 58.0%, respectively, the acetic acid-induced nociception (indomethacin: 27.95 μmol/kg, p.o.; 68.9%). Flavonoids 1, 2, 3 or 5, at the same doses, reduced by 39.5%, 46.5%, 35.6% and 33.3%, respectively, the croton oil-induced oedema (dexamethasone: 5.09 μmol/kg, s.c.; 83.7%) and impaired leukocyte migration by 42.9%, 46.3%, 50.4% and 49.6%, respectively (dexamethasone: 5.09 μmol/kg, s.c.; 66.1%).ConclusionsOur findings show that the major kaempferol glycosides may account for the renowned medicinal use of Sedum dendroideum against pain and inflammatory troubles.