New inhibitors of matrix metalloproteinases 9 (MMP-9): Lignans from ce:italic>Selaginella moellendorffii/ce:italic>

摘要

Matrix metalloproteinase 9 (MMP-9) is one of the structurally related zinc-dependent endopeptidases families and provides a new target for cancer therapy owing to its pivotal role in metastatic tumors. In this paper, fourteen lignans, including three novel lignans, named selamoellenin B–D (1–3), and eleven known lignan derivatives (4–14) were isolated from the plant ofSelaginella moellendorffii. Among them, compound3is optically active, which was enantiomerically seperated to afford a pair of enantiomers, (?)-3and (+)-3. Their structures were elucidated by extensive spectroscopic analyses. Their cytotoxic activities were evaluated against four human cancer cell lines. Among them, five compounds (4,5,6,11and13) exhibited great potent cytotoxicity and their structure-activity relationships were also discussed. All compounds except for 3 lignan analogues with low cytotoxicity were selected for further in vitro enzyme inhibition, surface plasmon resonance (SPR), and molecular docking assays based on the MMPs target. The results shown that, compound11have the best inhibitory effect and can be considered as a potential drug candidate targeting at MMP-9 for cancer therapy.