中国寄生虫学与寄生虫病杂志 ›› 2003, Vol. 21 ›› Issue (5): 12-299.

• 实验研究 • 上一篇    下一篇

外源性花生四烯酸在弓形虫入侵巨噬细胞中的信号作用

彭碧文,黄清玲,林建银,蒋明森   

  1. 福建医科大学分子医学研究中心,武汉大学医学院,福州 350004,武汉430071
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2003-10-30 发布日期:2003-10-30

Signaling Role of Exogenous Arachidonic Acid in the Invasion of Macrophages by Toxoplasma gondii

PENG Bi-wen 1,2,HUANG Qing-ling1,LIN Jian-yin 1*,JIANG Ming-sen2   

  1. 1 Research Center of Molecular Medicine;Fujian Medical University,Fuzhou 350004 2 Medical College of Wuhan University,Wuhan 430071
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-10-30 Published:2003-10-30

摘要:   目的 探讨花生四烯酸在弓形虫侵染巨噬细胞中的信号作用。 方法 采用普通光镜、流式细胞仪检测巨噬细胞的感染率;Fura2/AM染色,荧光分光光度法测定游离钙离子浓度。 结果 宿主细胞内钙离子浓度及巨噬细胞感染率随着外源性花生四烯酸浓度的增加而升高,并呈剂量依赖性关系。细胞外的钙离子内流,细胞内储存的钙离子释放,包括胞膜钙离子通道均在花生四烯酸的作用下,参与了胞内钙离子的升高。钙离子通道阻断剂对花生四烯酸作用前后的感染率的影响不明显。 结论 花生四烯酸可能通过钙离子作用于宿主细胞,增高其感染率。

关键词: 弓形虫, 入侵, 巨噬细胞, 花生四烯酸, 钙信号

Abstract:  Objective To investigate the signaling role of arachidonic acid in the invasion of RAW264.7 macrophage by Toxoplasma gondii . Methods Rate of infection was calculated by both light microscope and flow cytometer. Fluorescent emission spectra were recorded using a microspectrofluometer for the concentration of cytoplasmic free calcium. Results Calcium concentration in macrophages and rate of infection increased with a higher concentration of exogenous arachidonic acid in a dose-dependent manner. The invasion was dependent on the mobilization of calcium from the extracellular medium and from intracellular stores and followed the influx of calcium into the parasitized cell. Conclusion Arachidonic acid may enhance the rate of infection via calcium transduction pathway.

Key words: Toxoplasma gondii, invasion, macrophage, arachidonic acid, calcium signal