中国寄生虫学与寄生虫病杂志 ›› 2010, Vol. 28 ›› Issue (4): 4-260.

• 论著 • 上一篇    下一篇

特异性锤头状核酶对蓝氏贾第鞭毛虫丙酮酸激酶mRNA的表达抑制

冯宪敏1,3, 曹利静2,3, 王凤云3, 张西臣4, 卢思奇3 *   

  1. 1 吉林医药学院病原生物教研室,吉林 132013;2 河北省儿童医院重症监护科,石家庄 050031;3 首都医科大学病原生物学系,北京 100069;4 吉林大学畜牧医学院,长春 130062
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-08-30 发布日期:2010-08-30

Inhibition of Pyruvate Kinase mRNA Expression in Giardia lamblia by Specific Hammerhead Ribozyme

FENG Xian-min1,3,CAO Li-jing2,3,WANG Feng-yun3,ZHANG Xi-chen4,LU Si-qi3 *   

  1. 1 Department of Pathogen Biology,Jilin Medical College,Jilin 132013,China;2 Pediatric Intensive Care Unit,Hebei Children′s Hospital,Shijiazhuang 050031,China;3 Department of Pathogen Biology,Capital Medical University,Beijing 100069,China;4 College of Animal Science and Veterinary Medicine,Jilin University,Changchun 130062,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-08-30 Published:2010-08-30

摘要: 目的 应用特异性锤头状核酶技术研究蓝氏贾第鞭毛虫丙酮酸激酶(pyruvate kinase)mRNA的表达抑制。 方法 用电击转染的方法将含有针对贾第虫丙酮酸激酶mRNA的核酶pGCV-PKH载体导入蓝氏贾第鞭毛虫滋养体细胞内(A组),同时设单纯电击转染滋养体(B组)和正常培养滋养体(C组)为对照。转染后24、48、72和96 h收集各组虫体,计算滋养体浓度,绘制虫体生长曲线。提取虫体总RNA,分别采用RT?鄄PCR和实时PCR方法检测转染后各组各时间段(24、 48、72和96 h)核酶mRNA和丙酮酸激酶mRNA相对含量的变化,用紫外分光光度法检测丙酮酸激酶活性。 结果 虫体生长曲线显示,转染96 h,A组虫体的生长受到明显抑制。RT?鄄PCR检测结果表明,A组在转染后24 h即可在贾第虫滋养体细胞内检测到核酶RNA,其水平可持续至转染后96 h。A组在电击转染后24和48 h,丙酮酸激酶mRNA的表达量分别下降至C组的5%(5.00±0.17)和8%(8.00±0.19), 相应的酶活性下降至C组的32%(32.00±0.64)和38%(38.00±0.65)。结论 特异性锤头状核酶显著抑制了蓝氏贾第鞭毛虫丙酮酸激酶mRNA的表达。

关键词: 蓝氏贾第鞭毛虫, 丙酮酸激酶, 锤头状核酶

Abstract: Objective To inhibit the expression of pyruvate kinase (PK) mRNA in Giardia lamblia by specific hammerhead ribozyme. Methods The constructed hammerhead-GCV vector (pGCV-PKH) which aims to PK mRNA was electroporated into G. lamblia trophozoites (group A). Electroporated trophozoites (group B) and normal trophozoites (group C) served as control. Trophozoites in each group were collected at 24, 48, 72 and 96 h post-electroporation, respectively. The concentrations of trophozoites were calculated and the growth curves were constructed. At 24,48,72 and 96 h post-electroporation, mRNA of each group was detected by RT-PCR and realtime PCR, respectively. The PK activity was tested by ultraviolet spectrophotometry. Results The growth curve showed that the growth of trophozoites was considerably depressed after 96 h post-electroporation. RT-PCR result displayed that the specific ribozyme mRNA was detected in group A from 24 h to 96 h post-electroporation. At 24 and 48 h after transfection, the PK mRNA level of group A decreased to 5% (5±0.17) and 8% (8±0.19) of the level in group C, respectively; and the PK activity of group A decreased to 32%(32±0.64) and 38% (38±0.65) of the level in group C. Conclusion PK mRNA expression in G. lamblia has been inhibited by specific hammerhead ribozyme.

Key words: Giardia lamblia, Pyruvate kinase, Hammerhead ribozyme