旋毛虫排泄分泌蛋白对人肝癌HepG2细胞增殖的抑制作用

Inhibitory Effect of the Excretory/Scretory Proteins of Trichinella spiralis on Proliferation of Human Hepatocellular Carcinoma Hep G2 Cell line

采用MTT法检测旋毛虫肌幼虫排泄分泌蛋白对人肝癌Hep G2细胞增殖的抑制作用。AO/EB荧光染色观察与300μg/ml排泄分泌蛋白共培养24 h的Hep G2细胞的细胞核形态。用75μg/ml排泄分泌蛋白作用Hep G2细胞24 h后,流式细胞术(FCM)分析细胞凋亡率,免疫荧光法检测细胞cleaved-caspase 9的表达。结果显示,旋毛虫排泄分泌蛋白呈剂量依赖性抑制人肝癌Hep G2细胞的增殖。300μg/ml排泄分泌蛋白作用24 h后,Hep G2细胞核固缩呈圆珠状凋亡特征。75μg/ml排泄分泌蛋白作用细胞24 h后,细胞早期和晚期凋亡率分别为17.9%和7.3%,细胞坏死占6.6%;Hep G2细胞中cleaved-caspase 9荧光强度明显高于阴性对照。

Human hepatocellular carcinoma HepG2 Cell line were cultured with different concentrations of excretory/secretory proteins from Trichinella spiralis, and MTT assay was used to evaluate the cell inhibition rate. After co-cultured with 300 μg/ml excretory/secretory proteins for 24 h, the HepG2 cells were observed under a fluorescence microscope with AO and EB staining. When co-cultured with 75 μg/ml excretory/secretory proteins for 24 h, the HepG2 cells were quantified by flow cytometry using Annexin V-FITC/PI stain, and the expression of cleaved-caspase 9 was detected by immunofluorescence assay. The proliferation of HepG2 cells was inhibited significantly by excretory/secretory proteins in a dosage dependant manner. Under fluorescence microscope, some HepG2 cells presented typical apoptotic morphologic changes and the cleaved-caspase 9 protein expression was higher than that of the control. The early and late apoptotic cells and necrotic ones occupied 17.9%, 7.3%, and 6.6%, respectively.