中国寄生虫学与寄生虫病杂志 ›› 2014, Vol. 32 ›› Issue (4): 11-299-303.

• 论著 • 上一篇    下一篇

旋毛虫排泄分泌蛋白对小细胞肺癌NCI-H446细胞凋亡的影响

常红敏1,赵蕾1,王小杰2,方艳辉1,李丹1,罗婧梅1,杜娈英1 *   

  1. 1 承德医学院病原生物学教研室,承德 067000;2 承德医学院基础医学研究所,承德 067000
  • 出版日期:2014-08-30 发布日期:2014-10-31

Effect of the Excretory/Scretory Proteins from Trichinella spiralis on Apoptosis of NCI-H446 Small-cell Lung Cancer Cells

CHANG Hong-min1,ZHAO Lei1,WANG Xiao-jie2,FANG Yan-hui1, LI Dan1,LUO Jing-mei1,DU Luan-ying1 *   

  1. 1 Department of Pathogen Biology,Chengde Medical College,Chengde 067000,China;2 Institute of Basic Medical of Chengde Medical College,Chengde 067000,China
  • Online:2014-08-30 Published:2014-10-31

摘要:

目的  研究旋毛虫肌幼虫排泄分泌蛋白对人小细胞肺癌NCI-H446细胞凋亡的影响。  方法  旋毛虫肌幼虫培养24 h,收集培养液,取上清,即为旋毛虫肌幼虫排泄分泌蛋白。将人小细胞肺癌NCI-H446细胞(编号A054)随机分为3组,实验组(A组)和细胞凋亡组(B组)的NCI-H446细胞(5×106/ml)分别与旋毛虫排泄分泌蛋白(终浓度为0.3 mg/ml)和顺铂(6.4 μg/ml)共培养24 h,空白对照组(C组)的NCI-H446细胞培养24 h,不作任何处理。RT-PCR检测3组NCI-H446细胞中凋亡抑制基因Bcl-2、凋亡相关基因Fas和Fas配体(Fasl)mRNA的表达水平。以抗原癌基因C-myc标签鼠单克隆抗体为一抗,蛋白质印迹(Western blotting)检测3组细胞C-myc蛋白的表达情况。免疫荧光检测3组NCI-H446细胞中C-myc蛋白阳性表达情况。  结果  RT-PCR结果显示,经旋毛虫排泄分泌蛋白处理的NCI-H446细胞(A组),Bcl-2 mRNA相对表达水平最低,为(0.575±0.047),与B(0.850±0.073)、C组(0.975±0.069)比较,差异均有统计学意义(P<0.05)。A组Fas mRNA相对表达量最高,为(0.975±0.115),B(0.817±0.121)、C组(0.769±0.061)相对较低(P<0.05)。A、B和C组细胞Fasl mRNA相对表达水平分别为0.669±0.051、0.787±0.124、0.875±0.125(P<0.05)。A、B和C组细胞Fas/Fasl mRNA比值分别为1.475、1.038和0.878。Western blotting分析结果显示,A组C-myc相对表达水平最低(0.566±0.054),B(1.074±0.069)、C组(1.172±0.026)相对较高(P<0.05)。免疫荧光定位结果显示,旋毛虫排泄分泌蛋白和顺铂作用后24 h,C-myc蛋白在细胞浆/细胞核表达。  结论  旋毛虫排泄分泌蛋白可促进人小细胞肺癌细胞系NCI-H446细胞凋亡,可能是通过调节凋亡蛋白C-myc表达、进而抑制Bcl-2 mRNA的表达并调节Fas/Fasl mRNA比例来实现的。

关键词: 旋毛虫, 排泄分泌蛋白, 小细胞肺癌, NCI-H446, 凋亡基因, 凋亡蛋白

Abstract:

Objective To investigate the effect of excretory/secretory proteins from Trichinella spiralis on apoptosis of NCI-H446 small-cell lung cancer cells. Methods Trichinella spiralis muscle stage larvae (5×106/ml)were cultured in culture media for 24 h, the excretory/secretory proteins were collected from the supernatant of culture media. NCI-H446 small-cell lung cancer cells(No. A05) were randomly divided into three groups: experiment group(A), standard control group (apoptosis group, B), and control group (C). NCI-H446 cells in groups A and B were cultured with 0.3 mg/ml T. spiralis excretory/secretory proteins, and 6.4 μg/ml cisplatin for 24 h, respectively. NCI-H446 cells of group C were cultured for 24 h without any treatment. The expression of Bcl-2, Fas and Fasl mRNA was detected by RT-PCR. C-myc protein expression level was examined by Western blotting and immunofluorescence assay. Results The level of Bcl-2 mRNA was lowest in group A(0.575±0.047) , Bcl-2 mRNA level in group C (0.975±0.069) was higher than that of group B (0.850±0.073)(P<0.05). Fas mRNA level was highest in group A(0.975±0.115), followed by group B(0.817±0.121) and group C(0.769±0.061)(P<0.05). The level of Fasl mRNA in groups A, B, and C was 0.669±0.051, 0.787±0.124, and 0.875±0.125, respectively(P<0.05). Fas/Fasl mRNA ratio in groups A, B, and C was 1.475,1.038,and 0.878. Western blotting showed that the expression of C-myc protein in group C(1.172±0.026) was highest, followed by group B (1.074±0.069) and A(0.566±0.054)(P<0.05). Immunofluorescence test indicated that the C-myc protein was found in the cytoplasm and the nucleus 24 h after treated with 0.3 mg/ml T. spiralis excretory/secretory proteins and 6.4 μg/ml cisplatin. Conclusion Trichinella spiralis excretory/secretory proteins may inhibit apoptosis of NCI-H446 small-cell lung cancer cells by reducing the apoptosis protein C-myc and Bcl-2 mRNA levels, and causing the increase of Fas/Fasl mRNA ratio.

Key words: Trichinella spiralis, Excretory/secretory protein, Apoptotic gene, Small-cell lung cancer cell, NCI-H446, lApoptotic protein