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中华口腔医学研究杂志(电子版) ›› 2012, Vol. 6 ›› Issue (01) : 9 -15. doi: 10.3877/cma.j.issn.1674-1366.2012.01.002

基础研究

Rac1 在小鼠中性粒细胞抗白假丝酵母菌感染中的作用
赵赛男1, 章小缓1, 李文卿2, 胡雁2,(), Michael Glogauer3   
  1. 1.510055 广州,中山大学光华口腔医学院·附属口腔医院,广东省口腔医学重点实验室
    2.中山大学光华口腔医学院口腔生物学教研室
    3.Faculty of Dentistry, University of Toronto, Canada
  • 收稿日期:2011-10-09 出版日期:2012-02-01
  • 通信作者: 胡雁
  • 基金资助:
    国家自然科学基金(81170969)广东省科技计划(2010B060900036)中山大学实验教学研究(改革)基金(YJ200827)

The key role of Rac1 played in mice neutrophils against Candida infection

Sai-nan ZHAO1, Xiao-huan ZHANG1, Wen-qing LI1, Yan HU1,(), Glogauer Michael2   

  1. 1.Guanghua School of Stomatology,Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055,China
    2.Faculty of Dentistry, University of Toronto, Canada
  • Received:2011-10-09 Published:2012-02-01
  • Corresponding author: Yan HU
引用本文:

赵赛男, 章小缓, 李文卿, 胡雁, Michael Glogauer. Rac1 在小鼠中性粒细胞抗白假丝酵母菌感染中的作用[J/OL]. 中华口腔医学研究杂志(电子版), 2012, 6(01): 9-15.

Sai-nan ZHAO, Xiao-huan ZHANG, Wen-qing LI, Yan HU, Glogauer Michael. The key role of Rac1 played in mice neutrophils against Candida infection[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2012, 6(01): 9-15.

目的

评价Rac1 基因在小鼠抗白假丝酵母菌感染中的作用。

方法

(1)β-actin作为内参,Western blot 半定量法检测两种小鼠中性粒细胞Rac1 蛋白表达量;(2)趋化实验用Zigmond 法经甲酰甲硫氨酰-亮氨酰-苯丙氨酸(fMLP)诱导中性粒细胞移动,延时显微镜观察中性粒细胞移动并拍照,细胞追踪软件分析小鼠中性粒细胞趋化功能;(3)fMLP 诱导小鼠中性粒细胞过氧化物的产生应用异氨基苯二酰肼化学发光分析法通过微孔板发光检测仪检测过氧化物酶含量,采用细胞色素c 还原法分析豆蔻酸-佛波醇-乙酸酯(PMA)引发中性粒细胞产生的过氧化物。

结果

假丝酵母菌耐受BALB/c 小鼠中性粒细胞Rac1 蛋白表达量高于假丝酵母菌易感CBA/CaH 小鼠;BALB/c 小鼠中性粒细胞趋化运动功能较CBA/CaH 小鼠强(P <0.05);经fMLP 和PMA 诱导后,BALB/c 小鼠中性粒细胞过氧化物的产生量高于CBA/CaH 小鼠(P <0.05)。

结论

在小鼠中性粒细胞抗白假丝酵母菌感染过程中,Rac1 能增强小鼠中性粒细胞的杀伤能力。

Objective

To evaluate the effects of Rac1 gene in neutrophil during mice against Candida infection.

Methods

(1)Immunoblot was applied to analyze Rac1 levels in neutrophils from two strains of inbred mice with β-actin as control. (2)Neutrophils undergoing chemotaxis in response to fMLP were recorded using time-lapse imaging. Cell-tracking software was used to characterize cellular chemotaxis from captured images. (3)Neutrophil NADPH oxidase activity was measured as superoxide dismutase-inhibitable superoxide production using an isoluminol chemiluminescence assay for cells activated by fMLP or the cytochrome c reduction assay for cells activated with PMA.

Results

Rac1 was expressed deficiently by neutrophils from CBA/CaH mice,which also displayed significantly reduced speed compared with those from BALB/c mice in the chemotactic gradient. Furthermore, superoxide production of neutrophils from CBA/CaH stimulated with either PMA or fMLP, was lower than those from BALB/c mice.

Conclusions

Rac1 may play a key role for mice against-infection through mediating neutrophil chemotaxis and NADPH.

图1 Western blot 检测两种小鼠Rac1 蛋白表达量 经fMLP 诱导或不经fMLP 诱导的BALB/c 小鼠中性粒细胞Rac1 蛋白的表达量(第1 和第2 道)均高于CBA/CaH 小鼠(第3 和第4 道)。 第1道为BALB/c 小鼠中性粒细胞经fMLP 诱导后,可见明显的蛋白表达条带;第2 道为BALB/c 小鼠中性粒细胞未经fMLP 诱导,蛋白表达与第1 道近似;第3 道为CBA/CaH 小鼠中性粒细胞经fMLP 诱导后,蛋白表达条带较第1 道和第2 道弱;第4 道为CBA/CaH 小鼠中性粒细胞未经fMLP 诱导,蛋白表达条带模糊不清;M 为标记蛋白,β-actin 作为内参
表1 BALB/c 和CBA/CaH 小鼠中性粒细胞在fMLP 刺激下的运动速度(,nm/s)
图2 BALB/c 小鼠和CBA/CaH 小鼠中性粒细胞在fMLP 刺激下运动速度比较 在化学诱导剂fMLP 的刺激下,BALB/c 小鼠中性粒细胞向诱导剂方向运动的速度较CBA/CaH 小鼠快,差异有统计学意义(aP <0.05)
表2 BALB/c 和CBA/CaH 小鼠骨髓中性粒细胞分别经fMLP 和PMA 刺激后,过氧化物的产量(,ng)
图3 BALB/c 和CBA/CaH 小鼠骨髓中性粒细胞经fMLP 或PMA 激活后,过氧化物产生量的比较 BALB/c 和CBA/CaH 小鼠骨髓中性粒细胞经fMLP 或PMA 激活后,BALB/c 小鼠的中性粒细胞产生过氧化物的量高于CBA/CaH 小鼠中性粒细胞,差异有统计学意义(aP <0.05)
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