Isomethoxyneihumicin, a new cytotoxic agent produced by marine Nocardiopsis alba KM6-1
Isomethoxyneihumicin, a new cytotoxic agent produced by marine Nocardiopsis alba KM6-1
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DOI:
10.1038/ja.2016.152
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发表时间:
2017-05-01
影响因子:
3.3
通讯作者:
Tomoda, Hiroshi
中科院分区:
文献类型:
--
作者:
Fukuda, Takashi;Takahashi, Misaki;Tomoda, Hiroshi
A new cytotoxic agent designated isomethoxyneihumicin (1 and 2), a mixture of lactam-lactim tautomers, was isolated along with methoxyneihumicin (3) from the culture broth of the marine Nocardiopsis alba KM6-1. The structures of 1 and 2 were elucidated in spectroscopic analyses (1D and 2D NMR data, and ROESY correlations). Isomethoxyneihumicin (15.0 mu M) and 3 (15.0 mu M) arrested the cell cycle of Jurkat cells at the G2/M phase (66 and 67%) in 12 h. Isomethoxyneihumicin and 3 exhibited cytotoxicity against Jurkat cells with IC50 values of 6.98 and 30.5 mu M in 20 h, respectively. These results strongly suggest that isomethoxyneihumicin and 3 exhibit cytotoxicity against Jurkat cells by inhibiting the cell cycle at the G2/M phase.