Meroterpenoids from Marine Sponge sp. and Their Anticancer Activity against Human Colorectal Cancer Cells.

Two new meroterpenoids, hyrtamide A () and hyrfarnediol A (), along with two known ones, 3-farnesyl-4-hydroxybenzoic acid methyl ester () and dictyoceratin C (), were isolated from a South China Sea sponge sp. Their structures were elucidated by NMR and MS data. Compounds - exhibited weak cytotoxicity against human colorectal cancer cells (HCT-116), showing IC values of 41.6, 45.0, and 37.3 μM, respectively. Furthermore, compounds and significantly suppressed the invasion of HCT-116 cells while also downregulating the expression of vascular endothelial growth factor receptor 1 (VEGFR-1) and vimentin proteins, which are key markers associated with angiogenesis and epithelial-mesenchymal transition (EMT). Our findings suggest that compounds and may exert their anti-invasive effects on tumor cells by inhibiting the expression of VEGFR-1 and impeding the process of EMT.