Five undescribed steroids from Talaromyces stipitatus and their cytotoxic activities against hepatoma cell lines.

Mi Zhang, Yanfang Deng, Fei Liu, Meijia Zheng, Yu Liang, Weiguang Sun, Qin Li, Xiao-Nian Li, Changxing Qi, Junjun Liu, Chunmei Chen, Hucheng Zhu, Yonghui Zhang

Phytochemistry 2021 Sep

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Five undescribed sterol derivatives, (22E,24R)-7α-methoxy-5α,6α-epoxyergosta-8(14),22-diene-3β,15β-diol, (22E,24R)-5α,6α-epoxyergosta-8(14),22-diene-3β,7β,15α-triol, (22E,24R)-3β,5α-dihydroxy-14β,15β-epoxyergosta-7,22-diene-6-one, (22E,24R)-6α-methoxy-7α,15β-dihydroxyergosta-4,8(14),22-triene-3-one, and (25S)-ergosta-7,24(28)-diene-3β,4α,6α,26-tetraol were isolated from the extract of Talaromyces stipitatus, along with eight known congeners. This is the first example of a class of ergosterols isolated from T. stipitatus. Their structures with absolute configurations were elucidated based on NMR spectroscopic data, ECD calculations, and X-ray crystallographic analyses. All these compounds were tested for their effects on three hepatoma cell lines including Hep3B, HepG2, and Huh-7. Moreover, (22E,24R)-5α,6α-epoxyergosta-8(14),22-diene-3β,7β,15α-triol and (22E,24R)-9α,15α-dihydroxyergosta-4,6,8(14),22-tetraen-3-one were further evaluated for their impacts on cell cycle progression and apoptosis due to their pronounced cytotoxicity, to uncover their underlying mechanisms. Our results suggested that their antiproliferative activities were mainly mediated by inducing cell apoptosis. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Mi Zhang, Yanfang Deng, Fei Liu, Meijia Zheng, Yu Liang, Weiguang Sun, Qin Li, Xiao-Nian Li, Changxing Qi, Junjun Liu, Chunmei Chen, Hucheng Zhu, Yonghui Zhang. Five undescribed steroids from Talaromyces stipitatus and their cytotoxic activities against hepatoma cell lines. Phytochemistry. 2021 Sep;189:112816