Cytotoxic metabolites from the cultures of endophytic fungi from Panax ginseng |
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Authors: | Cheng-Jian Zheng Li-Li Xu Yuan-Yuan Li Ting Han Qiao-Yan Zhang Qian-Liang Ming Khalid Rahman Lu-Ping Qin |
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Institution: | 1. Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai, 200433, People’s Republic of China 2. The Research Institute of TCM Literature, Shanghai TCM University, Shanghai, 201203, People’s Republic of China 3. Faculty of Science, School of Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, England, UK 4. Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai, 200433, People’s Republic of China
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Abstract: | Two strains of endophytic fungi, Penicillium melinii Yuan-25 and Penicillium janthinellum Yuan-27, with strong anti-Pyricularia oryzae activity, were obtained from the roots of Panax ginseng. Based on bioactivity-oriented isolation, a new benzaldehyde derivative, ginsenocin (1), together with six known compounds, methyl 2,4-dihydroxy-3,5,6-trimethylbenzoate (2), 3,4,5-trimethyl-1,2-benzenediol (3), penicillic acid (4), mannitol (5), ergosterol (6), and ergosterol peroxide (7), were separated from the EtOAc extract of Yuan-25 culture, while brefeldin A (8) was isolated as the major constituent from the EtOAc extract of Yuan-27 culture. The chemical structures were determined based on spectroscopic methods. All the isolated compounds 1–8 were evaluated for their cytotoxicity against six human cancer cell lines. Brefeldin A (8) was the most cytotoxic constituent against all the tested cell lines with IC50 values <0.12 μg/ml, while ginsenocin (1) and penicillic acid (4) also exhibited potent cytotoxicity with IC50 values ranging from 0.49 to 7.46 μg/ml. Our results suggest that endophytic fungi isolated from P. ginseng are a promising natural source of potential anticancer agents. |
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