Sphingofungins G and H: new five-membered lactones from Aspergillus penicilliodes Speg.

Abstract

Two new sphingofungins G (1) and H (2) with a five-membered lactone ring were identified from the solid-state fermentation of Aspergillus penicilliodes Speg., a dominant microorganism isolated previously from the post-fermentation of ripe Pu-er tea, together with six known metabolites. Their structures were elucidated by extensive spectroscopic methods. All of them were isolated from the mycelia culture of A. penicilliodes for the first time. The known compound, trypacidin, exhibited potent cytotoxities against five human cancer cell lines, e.g. myeloid leukemia HL-60, lung cancer A-549, hepatocellular carcinoma SMMC7721, breast cancer MCF-7, and colon cancer SW480, with IC₅₀ values of 0.55, 11.45, 10.95, 3.58, and 3.49 μM, resp., while cisplatin as the positive control, with IC₅₀ values of 8.63, 24.15, 21.99, 27.29, and 23.61 μM, resp.

Keywords:

• Aspergillus penicilliodes Speg.
• sphingofungins G and H
• cytotoxicity

Acknowledgements

The authors are grateful to the staffs of the analytical and bioactivity screening groups at State Key Laboratory of Phytochemistry and Plant Resources in West China, KIB, CAS, for measuring the spectroscopic data and cytotoxities.