中国免疫学杂志
中國免疫學雜誌
중국면역학잡지
CHINESE JOURNAL OF IMMUNOLOGY
2015年
4期
456-461
,共6页
维生素D%自噬%结核分枝杆菌%巨噬细胞
維生素D%自噬%結覈分枝桿菌%巨噬細胞
유생소D%자서%결핵분지간균%거서세포
Vitamin D%Autophagy%Mycobacterium tuberculosis%Macrophages
目的:探讨维生素D诱导巨噬细胞产生自噬并清除巨噬细胞内结核分枝杆菌( Mtb)的作用。方法:使用豆蔻酰佛波醇乙酯( PMA)诱导U937细胞分化使之具有吞噬能力,分化后的U937细胞随机分为阴性对照组、维生素D组、自噬抑制剂(3-MA)+维生素D组、阳性对照(雷帕霉素)组,以Mtb感染U937细胞6 h。感染后第4天,利用半定量RT-PCR检测自噬相关基因ATG5、Beclin-1及LL-37、LC3B mRNA的表达,流式细胞术检测LC3B-Ⅱ+和/或结核分枝杆菌抗原85A+( Ag85A+)的细胞。结果:与对照组相比,维生素D组ATG5、Beclin-1、LL-37、LC3B mRNA的表达增强(P<0.01),LC3B-Ⅱ+-细胞增多, Ag85A+-细胞减少,且LC3B-Ⅱ+-Ag85A--细胞增加(维生素D组38.0%比阴性对照组1.08%)。与维生素D组相比,在自噬抑制剂3-MA+维生素D组中,不但ATG5、Beclin-1、LC3B的mRNA表达受到抑制,LL-37的mRNA表达较维生素D组减少,而且3-MA抑制了细胞LC3B-Ⅱ的表达,同时抑制了1,25(OH)2D3对LC3B-Ⅱ+-Ag85A--细胞增加的作用。结论:维生素D能够诱导巨噬细胞产生自噬作用,并进一步有助于巨噬细胞清除结核分枝杆菌。
目的:探討維生素D誘導巨噬細胞產生自噬併清除巨噬細胞內結覈分枝桿菌( Mtb)的作用。方法:使用豆蔻酰彿波醇乙酯( PMA)誘導U937細胞分化使之具有吞噬能力,分化後的U937細胞隨機分為陰性對照組、維生素D組、自噬抑製劑(3-MA)+維生素D組、暘性對照(雷帕黴素)組,以Mtb感染U937細胞6 h。感染後第4天,利用半定量RT-PCR檢測自噬相關基因ATG5、Beclin-1及LL-37、LC3B mRNA的錶達,流式細胞術檢測LC3B-Ⅱ+和/或結覈分枝桿菌抗原85A+( Ag85A+)的細胞。結果:與對照組相比,維生素D組ATG5、Beclin-1、LL-37、LC3B mRNA的錶達增彊(P<0.01),LC3B-Ⅱ+-細胞增多, Ag85A+-細胞減少,且LC3B-Ⅱ+-Ag85A--細胞增加(維生素D組38.0%比陰性對照組1.08%)。與維生素D組相比,在自噬抑製劑3-MA+維生素D組中,不但ATG5、Beclin-1、LC3B的mRNA錶達受到抑製,LL-37的mRNA錶達較維生素D組減少,而且3-MA抑製瞭細胞LC3B-Ⅱ的錶達,同時抑製瞭1,25(OH)2D3對LC3B-Ⅱ+-Ag85A--細胞增加的作用。結論:維生素D能夠誘導巨噬細胞產生自噬作用,併進一步有助于巨噬細胞清除結覈分枝桿菌。
목적:탐토유생소D유도거서세포산생자서병청제거서세포내결핵분지간균( Mtb)적작용。방법:사용두구선불파순을지( PMA)유도U937세포분화사지구유탄서능력,분화후적U937세포수궤분위음성대조조、유생소D조、자서억제제(3-MA)+유생소D조、양성대조(뢰파매소)조,이Mtb감염U937세포6 h。감염후제4천,이용반정량RT-PCR검측자서상관기인ATG5、Beclin-1급LL-37、LC3B mRNA적표체,류식세포술검측LC3B-Ⅱ+화/혹결핵분지간균항원85A+( Ag85A+)적세포。결과:여대조조상비,유생소D조ATG5、Beclin-1、LL-37、LC3B mRNA적표체증강(P<0.01),LC3B-Ⅱ+-세포증다, Ag85A+-세포감소,차LC3B-Ⅱ+-Ag85A--세포증가(유생소D조38.0%비음성대조조1.08%)。여유생소D조상비,재자서억제제3-MA+유생소D조중,불단ATG5、Beclin-1、LC3B적mRNA표체수도억제,LL-37적mRNA표체교유생소D조감소,이차3-MA억제료세포LC3B-Ⅱ적표체,동시억제료1,25(OH)2D3대LC3B-Ⅱ+-Ag85A--세포증가적작용。결론:유생소D능구유도거서세포산생자서작용,병진일보유조우거서세포청제결핵분지간균。
Objective:To investigate the role of vitamin D-induced autophagy in macrophages against Mycobacterium tuberculosis(Mtb).Methods:Induce U937 cells to differentiate into macrophages with phagocytic capacity by phorbol 12-myristate 13-acetate(PMA).The cells were randomly divided into negative control group,vitamin D group,autophagy inhibitor(3-MA)+vitamin D group,positive control(rapamycin)group.Infect all groups with Mtb for 6 hours.In the 4th day after infection,the mRNA expressions of autophagy-related genes ATG5, Beclin-1 and LL-37, LC3B were determined by semi-quantitative RT-PCR.LC3B-Ⅱ+and/or Mycobacterium tuberculosis antigen 85A+( Ag85A+)-cells were counted by flow cytometry.Results:Compared with the control groups, the mRNA expressions of ATG5,Beclin-1,LL-37 and LC3B were enhanced(P<0.01),the numbers of LC3B-Ⅱ+-cells increased,the numbers of Ag85A+-cells decreased, and the numbers of LC3B-Ⅱ+-Ag85A--cells increased ( vitamin D group 38.0% vs negative control group1.08%).Compared with the vitamin D group,the mRNA expressions of ATG5,Beclin-1 and LC3B were suppressed in the autophagy inhibitor(3-MA)+Vitamin D group,the mRNA expressions of LL-37 were reduced,and 3-MA inhibited the expression of LC3B-Ⅱ in cells with inhibition of LC3B-Ⅱ+-Ag85A--cells increase as well.Conclusion: Vitamin D can induce macrophage autophagy and further contribute to scavenging Mycobacterium tuberculosis.