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Highly Potent Antiausterity Agents from Callistemon citrinus and Their Mechanism of Action against the PANC-1 Human Pancreatic Cancer Cell Line.
Journal of Natural Products ( IF 3.3 ) Pub Date : 2020-06-23 , DOI: 10.1021/acs.jnatprod.0c00330
Ahmed M Tawila 1 , Sijia Sun 1 , Min Jo Kim 1 , Ashraf M Omar 1 , Dya Fita Dibwe 1 , Jun-Ya Ueda 2 , Naoki Toyooka 3 , Suresh Awale 1
Affiliation  

Human pancreatic cancer cells display remarkable tolerance to nutrition starvation that help them to survive in a hypovascular tumor microenvironment, a phenomenon known as “austerity”. The elucidation of agents countering this tolerance is an established antiausterity strategy in anticancer drug discovery. In this study, a Callistemon citrinus leaf extract inhibited the viability of PANC-1 human pancreatic cancer cells preferentially under nutrient-deprived medium (NDM) with a PC50 value of 7.4 μg/mL. Workup of this extract resulted in the isolation of three new meroterpenoids, callistrilones L–N (13), together with 14 known compounds (417). The structure elucidation of the new compounds was achieved by HRFABMS and by NMR and ECD spectroscopic analysis. The new compounds showed highly potent preferential cytotoxicity against PANC-1 cells with PC50 values ranging from 10 to 65 nM in NDM. Of these, callistrilone L (1) inhibited PANC-1 cell migration and colony formation in a normal nutrient-rich condition. Callistrilone L (1) also strongly suppressed the migration of PANC-1 cells in real time. Mechanistically, 1 was found to inhibit the Akt/mTOR and autophagy activation pathway. Callistrilone L (1) and related meroterpenoids are promising leads for anticancer drug development based on the antiausterity strategy used in this work.

中文翻译:

Callistemon citrinus 的高效抗紧缩剂及其对 PANC-1 人胰腺癌细胞系的作用机制。

人类胰腺癌细胞对营养饥饿表现出显着的耐受性,这有助于它们在血管不足的肿瘤微环境中生存,这种现象被称为“紧缩”。阐明对抗这种耐受性的药剂是抗癌药物发现中已建立的抗紧缩策略。在这项研究中,柑橘叶提取物在营养剥夺培养基 (NDM) 下优先抑制 PANC-1 人胰腺癌细胞的活力,PC 50值为 7.4 μg/mL。对该提取物的处理导致分离出三种新的类萜类化合物,callistrilones L–N ( 13 ),以及 14 种已知化合物 ( 417)。新化合物的结构解析是通过 HRFABMS 和核磁共振和 ECD 光谱分析实现的。新化合物对 PANC-1 细胞显示出高度有效的优先细胞毒性,NDM 中的PC 50值范围为 10 至 65 nM。其中, callistrilone L ( 1 ) 在营养丰富的正常条件下抑制 PANC-1 细胞迁移和集落形成。Callistrilone L ( 1 ) 还实时强烈抑制 PANC-1 细胞的迁移。从机制上讲,发现1抑制 Akt/mTOR 和自噬激活途径。Callistrilone L ( 1 ) 和相关的类萜是基于这项工作中使用的抗紧缩策略的抗癌药物开发的有希望的先导。
更新日期:2020-07-24
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