Variance and resource of intracellular free calcium and extracellular arachidonic acid of host cells during the invasion of Toxoplasma gondii
- VernacularTitle:弓形虫侵入细胞过程中宿主胞内游离钙和胞外花生四烯酸的变化和来源
- Author:
Liwei LI
;
Jie YAN
- Publication Type:Journal Article
- Keywords:
Toxoplasma;
Vero cells;
J774A. 1;
Calcium;
Arachidonic acid;
Phospholipases A
- From:
Chinese Journal of Infectious Diseases
2008;26(4):211-216
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore variance and resource of intracellular free Ca2+ and extracellular arachidonic acid (AA) in different types of passage cells during the invasion of T. gondii. Methods The variance and resource of extracellular AA and intraceUular free Caz+ of Vero and J774A. 1 cells during the invasion of T. gondii were detected by multi-purpose scintillation counter and laser scanning confocal microscope. Data were analyzed using Chi-square test and t test. Results The intracellular free Ca2+ levels in J774A. 1 and Vero cells were both increased after T. gondii infection. The maximal changes of fluorescence intensity were (1 219.7±58.4)% (P＜0.01) and (356.3±23.6)% (P＜0.05), respectively.The increase of intracellular Ca2+ level in Vero cell was mostly from the release of intracellular Ca2+ store.And the Ca2+ increase in J774A. 1 cell was from both the release of intracellular Ca2+ store and extracellular Ca2+ influx. Extracellular AA levels were significantly increased in both Vero and J774A. 1 cells after T.gondii infection 5.02 and 8. 44 times respectively (t= 3. 124, t = 3. 852, P＜0.01). The AA elevations could be significantly inhibited by phospholipase A2 (PLA2) inhibitor pretreating T. gondii. Conclusions The phospholipase C of phagocytic host cell and PLA2 of T. gondii are activated by T. gondii infection,which results in the increase of intracellular free Ca2+ and extraeellular AA level. Combined actions of Ca2+and AA play a major role in the invasion of T. gondii to host cell. While only PLA2 of T. gondii may be activated in nonphagoeytic host cell.
