Grayanane diterpenoids from Craibiodendron yunnanense with anti-inflammatory and antinociceptive activities

Twenty-five grayanane diterpenoids including six undescribed compounds (craibiodenoside A-F), were isolated from the leaves of Craibiodendron yunnanense W. W. Smith. The structures of the isolated compounds were determined by ¹D-NMR, ²D-NMR, and HR-ESI-MS spectrometric analyses. All compounds were evaluated for their anti-inflammatory activities by inhibiting the release of interleukin-6 (IL-6) in lipopolysaccharide (LPS)-induced RAW264.7 cells. The results demonstrated that three undescribed compounds craibiodenoside A, B, F, and three known compounds could inhibit the release of IL-6 significantly. In addition, the antinociceptive activities of compounds were assessed using acetic acid-induced writhing test. Craibiodenoside D, grayanoside D, and rhodojaponins VI exhibited notable antinociceptive activities. Specifically, rhodojaponins VI exhibited antinociceptive activity with the inhibition percentage of 87.6%.