靶细胞捕集及超高效液相色谱-线性离子阱-静电场轨道阱质谱法分析预测姜黄中抗肺癌活性成分

该文建立了基于人肺腺癌A549细胞和超高效液相色谱-线性离子阱-静电场轨道阱质谱(UHPLC/LTQ Orbitrap MS)的靶细胞捕集-化学表征技术,用于分析预测姜黄中抗肺癌的潜在活性成分。将A549靶细胞和姜黄提取物一起孵育培养,根据活性成分可以与靶细胞膜有特异性结合或者进入靶细胞内的原理,用液质联用方法可对培养后的细胞结合成分进行分析。因姜黄中的主要活性成分为脂溶性成分,在与A549细胞共同孵育时出现吸附于培养瓶内壁的现象,造成空白溶液有干扰。该文通过细胞消化后多次离心和转移,解决了空白干扰问题,成功从姜黄提取物中筛选出3个与A549细胞结合的成分,经鉴定,分别为双脱甲氧基姜黄素、脱甲氧基姜黄素和姜黄素,系姜黄中主要的抗肺癌活性成分。该文结果表明通过改进的方法,可以解决脂溶性成分因吸附瓶壁而造成假阳性的情况,是对现有靶细胞捕集-化学表征技术的有力补充。

Screening of anti-lung cancer bioactive compounds from Curcuma longa by target cell extraction and UHPLC/LTQ Orbitrap MS

A target cell extraction-chemical profiling method based on human alveolar adenocarcinoma cell line (A549 cells) and UHPLC/LTQ Orbitrap MS for screening the anti-lung cancer bioactive compounds from Curcuma longa has been developed in this paper. According to the hypothesis that when cells are incubated together with the extract of Curcuma longa, the potential bioactive compounds in the extract should selectively combine with the cells, then the cell-binding compounds could be separated and analyzed by LC-MS. The bioactive compounds in C. longa are lipophilic components. They intend to be absorbed on the inner wall of cell culture flask when they were incubated with A549 cells, which will produce interference in the blank solution. In this paper, by using cells digestion and multi-step centrifugation and transfer strategy, the interference problem has been solved. Finally, using the developed method, three cell-binding compounds were screened out and were identified as bisdemethoxycurcumin, demethoxycurcumin, and curcumin. These compounds are the main bioactive compounds with anti-lung cancer bioactivity in C. longa. The improved method developed in this paper could avoid the false positive results due to the absorption of lipophilic compounds on the inner wall of cell culture flask, which will to be an effective complementary method for current target cell extraction-chemical profiling technology.