中国寄生虫学与寄生虫病杂志 ›› 2001, Vol. 19 ›› Issue (6): 7-347.

• 论著 • 上一篇    下一篇

一氧化氮供体对弓形虫速殖子DNA含量的影响

彭碧文1;胡建石 1;赵蓉1;蒋明森2;林建银1
  

  1. 福建医科大学分子医学教研室,福州350004 ;武汉大学医学院寄生虫教研室,武汉430071;
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2001-12-30 发布日期:2001-12-30

The Effect of Nitric Oxide Donor on the DNA Content in Toxoplasma gondii Tachyzoite

PENG Bi wen1;HU Jian shi 1;ZHAO Rong 1;JIANG Ming sen 2;LIN Jian yin 1   

  1. 1 Department of Molecular Medicine;Fujian Medical University;Fuzhou 350004; 2 Department of Parasitology;Medical College of Wuhan University;Wuhan 430071
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-12-30 Published:2001-12-30

摘要:   目的 探讨亚硝基铁氰化钠 (SNP)对弓形虫速殖子DNA含量的影响。 方法 采用SNP与影响胞内 /胞外钙离子浓度的试剂作用于RH株刚地弓形虫 (Toxoplasmagondii)速殖子 ,流式细胞仪检测其DNA含量的变化。 结果 ①SNP导致弓形虫速殖子DNA的损伤 ,并呈时间和剂量依赖性 ;② 2mmol/L胞外钙离子螯合剂EGTA ,2 5 μmol/L胞内钙离子螯合剂BAPTA/AM及 5 0 μmol/L钙离子拮抗剂verapamil单独处理弓形虫速殖子 ,其DNA含量与对照组相比无显著变化 ;③ 2mmol/LEGTA ,2 5 μmol/LBAPTA/AM及 5 0 μmol/Lverapamil明显减少 2mmol/LSNP所致的速殖子亚二倍体峰的比例。 结论 SNP通过改变弓形虫速殖子胞浆游离钙离子浓度 ,诱导其亚二倍体峰的出现 ,造成虫体的损伤

关键词: 刚地弓形虫, 速殖子, 亚硝基铁氰化钠(SNP), 一氧化氮, DNA含量, 流式细胞术

Abstract:  Objective To determine the role of sodium nitroprusside (SNP) in regulating DNA synthesis of Toxoplasma gondii tachyzoites. Methods Hypodiploid peak of tachyzoite DNA induced by SNP was assessed according to DNA fragmentation. The effect of SNP on appearance of hypodiploid peak and the effect of Ca 2+ on the growth of tachyzoites were evaluated. The intracellular Ca 2+ chelator (BAPTA/AM), antagonist of Ca 2+ channel(verapamil) and the extracellular Ca 2+ chelator (EGTA) were used. The change of DNA content was measured by flow cytometry. Results SNP inhibited DNA synthesis of tachyzoites in a dose and time dependent pattern. The antiproliferative effect of SNP on tachyzoites was inhibited by verapamil, EGTA and BAPTA/AM. The inhibition of the growth of tachyzoites by SNP was associated with increased subploid peak through a Ca 2+ dependent mechanism. Conclusion SNP induced a hypodiploid peak in tachyzoites by altering the Ca 2+ concentration in the plasma of tachyzoite, resulting in damages of the parasite.

Key words: Toxoplasma gondii, tachyzoite, sodium nitroprusside (SNP), nitric oxide, DNA content, flow cytometry