Abstract
A new oxoaporphine alkaloid, (−)-(6aR,7R)-N-acetylnorushinsunine (1) together with eight known compounds (2–9) had been isolated from the aerial part of Vietnamese Piper hymenophyllum Miq., Piperaceae. The chemical structures of 1–9 were established mainly by spectroscopic, spectrometric, and chiroptical spectra. Their anti-inflammatory activity was evaluated against lipopolysaccharides-induced nitric oxide production in RAW264.7 cells in vitro. Among them, compounds 2–4 showed significant inhibitory activities against the lipopolysaccharide-induced nitric oxide production in RAW264.7 cells with IC50 values of 7.2, 9.3, and 4.5 μM, respectively. In addition, compounds 2 and 4 suppressed both lipopolysaccharides-induced cyclooxygenase-2 and inducible nitric oxide synthase expressions. These results proposed that Piper hymenophyllum and its constituents may exert anti-inflammatory effects.
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