Abstract
Two new cytosporone derivatives (1 and 2) were isolated from the endophytic fungus Phomopsis sp. PSU-H188 together with 19 known compounds. Their structures were elucidated by analysis of spectroscopic data. Known mycoepoxydiene showed potent cytotoxic activity towards both MCF-7 and noncancerous Vero cell lines with the respective IC50 values of 9.27 and 4.06μM. It exhibited inhibition on glucose output in mouse primary hepatocytes with the IC50 value of 16.06μM, but did not show cytotoxicity on primary mouse hepatocytes. Additionally, known cytosporone B displayed protective activity against INS-1 832/13 pancreatic β-cells by an EC50 value of 11.08μM whereas known diaporthalasin displayed antibacterial activity against methicillin-resistant Staphylococcus aureus with an MIC value of 4μg/mL. Both of them were noncytotoxic to Vero cells.
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