Chemical Constituents of the Deep-Sea-Derived Penicillium citreonigrum MCCC 3A00169 and Their Antiproliferative Effects.

Six new citreoviridins (citreoviridins J-O, 1 - 6 ) and twenty-two known compounds ( 7 - 28 ) were isolated from the deep-sea-derived Penicillium citreonigrum MCCC 3A00169. The structures of the new compounds were determined by spectroscopic methods, including the HRESIMS, NMR, ECD calculations, and dimolybdenum tetraacetate-induced CD (ICD) experiments. Citreoviridins J-O ( 1 - 6 ) are diastereomers of 6,7-epoxycitreoviridin with different chiral centers at C-2-C-7. Pyrenocine A ( 7 ), terrein ( 14 ), and citreoviridin ( 20 ) significantly induced apoptosis for HeLa cells with IC 50 values of 5.4 μ M, 11.3 μ M, and 0.7 μ M, respectively. To be specific, pyrenocine A could induce S phase arrest, while terrein and citreoviridin could obviously induce G0-G1 phase arrest. Citreoviridin could inhibit mTOR activity in HeLa cells.