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浙江大学学报(医学版)  2013, Vol. 42 Issue (5): 486-491    DOI: 10.3785/j.issn.1008-9292.2013.05.002
专题报道     
TcpC通过促进活性氧的产生诱导巨噬细胞凋亡
张大勇,林仪茜,何非,方洁,张翀,王宝明,潘建平
浙江大学城市学院医学院,浙江 杭州 310015
TcpC induces apoptosis of macrophages through promoting ROS production
ZHANG Da-Yong, LIN Yi-Qian, HE Fei, FANG Jie, ZHANG Chong, WANG Bao-Ming, PAN Jian-Ping
Department of Medicine,Zhejiang University City College School of Medicine,Hangzhou 310015,China
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摘要:

目的:研究含有Toll/interleukin 1 receptor结构域的蛋白(TcpC)对巨噬细胞凋亡的影响,探讨TcpC诱导巨噬细胞凋亡的分子机制。
方法:通过Transwell 将分泌TcpC的尿路致病大肠埃希菌CFT073野生株(TcpCwt)和敲除tcpc基因的CFT073突变株(TcpCmut)与小鼠巨噬细胞系J774A隔开共培养,Annexin V/PI双染法观察不同数量和不同处理时间的TcpCwt和TcpCmut对J774A细胞凋亡的影响;活性氧染色观察不同处理时间的TcpCwt和TcpCmut对J774A细胞内活性氧水平的影响,Annexin V/PI双染法观察不同浓度N-乙酰半胱氨酸清除活性氧后TcpCwt和TcpCmut对J774A细胞凋亡的影响,Western blot法检测0.1 mmol N-乙酰半胱氨酸处理前后与TcpCwt和TcpCmut共培养的J774A细胞内caspase-3表达。
结果:与对照组和TcpCmut组相比,TcpCwt在细菌数量为5×105和5×106以及处理时间为24 h和36 h时均可显著促进J774A凋亡(均P<0.01)。共培养24 h和36 h的TcpCwt组J774A细胞内活性氧水平显著高于对照组和TcpCmut组(均P<0.01)。0.1 mmol和1 mmol N-乙酰半胱氨酸处理可显著抑制TcpCwt对J774A细胞的促凋亡作用(均P<0.01)。TcpCwt处理可显著降低J774A细胞内总caspase-3表达,而N-乙酰半胱氨酸处理可抑制与TcpCwt共培养的J774A细胞内caspase-3裂解,提高总caspase-3表达水平。
结论:TcpC可促进巨噬细胞内活性氧产生,进而介导巨噬细胞凋亡。

关键词: 肠致病性大肠杆菌巨噬细胞活性氧细胞凋亡小鼠基因敲除细胞培养的    
Abstract:
Objective: To investigate the effects of Toll/interleukin 1 receptor domain-containing protein(TcpC)on macrophages and its mechanisms.
Methods: Murine macrophage J774A cells were co-cultured with TcpC producing wild type E. coli strain CFT073 (TcpCwt) or tcpc gene-deleted CFT073 mutant (TcpCmut) in Transwell system,respectively. Apoptosis of J774A cells co-cultured with TcpCwt or TcpCmut was analyzed by Annexin/PI double staining. The levels of reactive oxygen species (ROS) in J774A cells were determined by DCFH-DA staining after treatment with TcpCwt or TcpCmut at 6 h,12 h,24 h or 36 h. After the ROS was scavenged by N-acetylcysteine (NAC),the changes of J774A cell apoptosis were also examined. The expression of caspase-3 in J774A cells co-cultured with TcpCwt or TcpCmut in the presence or absence of 0.1 mmol NAC was detected by Western blot.
Results: J774A cells co-cultured with TcpCwt for 24 h or 36 h showed significantly increased apoptosis (27.39%±4.05% and 28.45%±4.55%,respectively) when compared to control group (7.96%±1.63% and 10.55%±1.44%,P<0.01) or TcpCmut group (11.45%±2.77% and 19.26%±2.89%,P<0.01). Levels of ROS in J774A cells treated with TcpCwt for 24 h (108.8±9.73) or 36 h (100.3±10.11) were significantly higher than those in control group (56.8±4.11 and 52.8±4.42,P<0.01) or TcpCmut (69.7±5.66 and 62.6±4.56,P<0.01). The pro-apoptotic effects of TcpCwt on J774A cells were reversed by 0.1 or 1 mMol NAC treatment. Expression of caspase-3 in J774A cells co-cultured with TcpCwt (0.43±0.04) decreased significantly when compared to control group (0.75±0.08,P<0.05) or TcpCmut group (0.80±0.12,P<0.05). However,total caspase-3 expression was restored in J774A cells co-cultured with TcpCwt in the presence of 0.1 mmol NAC (0.80±0.09).
Conclusion: TcpC can promote ROS production in macrophages,hereby inducing macrophage apoptosis.
Key words: Enteropathogenic Escherichia coli    Macrophages    Reactive oxygen species    Apoptosis    Mice, Knockout    Cells, Cultured
收稿日期: 2013-06-14 出版日期: 2013-09-25
:  R 742.1  
基金资助:

浙江省医药卫生科技计划(2013KYA149);浙江大学城市学院大学生科研项目(XZ2013562106)

通讯作者: 潘建平(1962-),男,博士,教授,博士生导师,主要从事免疫学研究     E-mail: jppan@zucc.edu.cn
作者简介: 张大勇(1978-),男,博士,讲师,主要从事细胞衰老及凋亡机制研究;E-mail:zhangdy@zucc.edu.cn
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引用本文:

张大勇, 林仪茜, 何非, 方洁, 张翀, 王宝明, 潘建平. TcpC通过促进活性氧的产生诱导巨噬细胞凋亡[J]. 浙江大学学报(医学版), 2013, 42(5): 486-491.

ZHANG Da-Yong, LIN Yi-Qian, HE Fei, FANG Jie, ZHANG Chong, WANG Bao-Ming, PAN Jian-Ping. TcpC induces apoptosis of macrophages through promoting ROS production. Journal of ZheJiang University(Medical Science), 2013, 42(5): 486-491.

链接本文:

https://www.zjujournals.com/med/CN/10.3785/j.issn.1008-9292.2013.05.002        https://www.zjujournals.com/med/CN/Y2013/V42/I5/486

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