拉曼光谱研究两面针活性成分诱导肝癌细胞的凋亡

运用拉曼光谱法对两面针活性成分诱导的肝癌细胞凋亡进行分析,肝癌细胞7404分别经10 mg·L~(-1)氯化两面针碱及3 g·L~(-1)两面针提取液处理后,收集经药液处理12,24,36,48 h的各组细胞的拉曼光谱后,通过Hochest33342/PI荧光染色法鉴定细胞并保留荧光染色阳性(发生凋亡活细胞)的光谱,并在Origin Pro8.0系统中比较各组平均光谱的差异。收集肝癌细胞的拉曼光谱依次进行背景扣除、平滑、归一化等方法处理。Hochest荧光染色后空白组细胞核染色均匀,而药物处理48 h后,核碎裂,拉曼光谱结果显示两面针提取液处理肝癌细胞12,24,36,48 h后,与核酸及蛋白质相关的峰均有降低,其中785,1 002,1 175,1 660 cm~(-1)峰强度随两面针药物作用时间的延长而降低,表明两面针活性成分能够诱导肝癌细胞凋亡,凋亡的肝癌细胞中核酸和蛋白质的含量均低于活细胞。两面针活性成分作用时间与药效呈一定的相关性。拉曼光谱能够反映中药两面针活性成分作用后的肝癌细胞内物质变化的信息,对实时监测细胞凋亡过程及药物的临床应用具有重要意义。

Apoptosis of hepatocellular induced by active ingredients of Zanthoxyli Radix by Raman spectroscopy

The apoptosis of mono-hepatocellular induced by the active ingredients of the Zanthoxyli Radix was investigated using laser Raman spectroscopy. Hepatoma cells(BEL-7404) were treated with 10 mg·L^-1 nitidine chloride and 3 g·L^-1 the extracts of Zanthoxyli Radix, respectively, then were divided into two parts, one for fluorescence staining, the other for determination of Raman spectroscopy. The acquired spectra were then processed by background elimination, smoothing, and normalization. Fluorescence staining results showed that the nucleuses from untreated group were uniformly stained, while those from the group treated for 48 hours were densely stained and broken. The spectra results revealed that the intensity of peaks associated with nucleic acid and protein decreased after the cells were incubated with the extracts of Zanthoxyli Radix for 12, 24, 36 and 48 hours. The intensity of peaks at 785,1 002,1 175,1 660 cm^-1 was decreased with the time of the cells were incubated by the extracts of Zanthoxyli Radix. The results indicated that the extracts of Zanthoxyli Radix could induce the apoptosis of hepatoma cells and reduce the amount of nucleic acid and protein in the cells. There is a certain relevance between the drug treatment time and the efficacy. The above results suggest that Raman spectra can provide abundant information about the changes in biological macromolecules within the cells after incubated by the extracts of Zanthoxyli Radix and serve as an effective method for the real time measurement of apoptosis.