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
Tomoda, Hiroshi
中科院分区:
医学4区
文献类型:
--
作者:
Fukuda, Takashi;Takahashi, Misaki;Tomoda, Hiroshi

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从海洋白诺卡氏菌 KM6-1 的培养液中分离出一种新的细胞毒性剂,称为异甲氧基新腐霉素 (isomethoxyneihumicin)(1 和 2),它是内酰胺-内酰胺互变异构体的混合物,与甲氧基新腐霉素 (3) 一起从海洋白诺卡氏菌 KM6-1 的培养液中分离出来。 1 和 2 的结构通过光谱分析(1D 和 2D NMR 数据以及 ROESY 相关性)得到阐明。异甲氧基新腐霉素 (15.0 μM) 和 3 (15.0 μM) 在 12 小时内将 Jurkat 细胞的细胞周期阻滞在 G2/M 期(66% 和 67%)。 Isomethoxyneihumicin 和 3 对 Jurkat 细胞表现出细胞毒性,20 小时内的 IC50 值分别为 6.98 和 30.5 μM。这些结果强烈表明,isomethoxyneihumicin 和 3 通过抑制 G2/M 期的细胞周期,表现出针对 Jurkat 细胞的细胞毒性。
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.