Chinese Journal of Tissue Engineering Research ›› 2022, Vol. 26 ›› Issue (24): 3826-3832.doi: 10.12307/2022.561
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Xiang Mingzhi1, 2, Yuan Zilin2, 3, Wang Gang2, 3, Cheng Jie2, 4, Diao Bo2, 3, Liu Yueping2, 3
Received:
2021-01-28
Accepted:
2021-03-04
Online:
2022-08-28
Published:
2022-01-24
Contact:
Diao Bo, MD, Associate professor, Basic Medical Laboratory, General Hospital of Central Theater Command, Wuhan 430070, Hubei Province, China; Hubei Key Laboratory of Central Nervous System Tumor and Intervention, Wuhan 430070, Hubei Province, China
Liu Yueping, Master, Associate chief technician, Basic Medical Laboratory, General Hospital of Central Theater Command, Wuhan 430070, Hubei Province, China; Hubei Key Laboratory of Central Nervous System Tumor and Intervention, Wuhan 430070, Hubei Province, China
About author:
Xiang Mingzhi, Master candidate, Physician, Medical College, Wuhan University of Science and Technology, Wuhan 430081, Hubei Province, China; Basic Medical Laboratory, General Hospital of Central Theater Command, Wuhan 430070, Hubei Province, China
Supported by:
CLC Number:
Xiang Mingzhi, Yuan Zilin, Wang Gang, Cheng Jie, Diao Bo, Liu Yueping. CD1d-mediated inhibition of the nucleotide-binding oligomerization domain-like receptor protein 3 inflammatory factor expression via signal regulatory protein-alpha[J]. Chinese Journal of Tissue Engineering Research, 2022, 26(24): 3826-3832.
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2.1 慢病毒构建及验证 2.1.1 慢病毒载体构建及病毒包装 将目的基因CD1d、SIRPα和SIRPα-RNAi干扰序列克隆至pHBLV-CMV-MCS-3FLAG-EF1-ZsGreen-T2A-puromycin、pHBLV-CMV-MCS-EF1-Zsgreen1-T2A-puromycin、GV493载体质粒。如图1A所示,质粒pHBLV-CMV-MCS-3FLAG-EF1-ZsGreen-T2A-puromycin在1-952的位置与CD1d目的基因序列完全一致;如图1B所示,质粒pHBLV-CMV-MCS-3FLAG-EF1-ZsGreen-T2A-puromycin在1-1288位置与SIRPα目的基因序列完全一致;如图1C所示,GV493质粒序列中含有与设计的SIRPα-RNAi干扰序列(CCG GGC AAG CAT TGA GAC AGG CAA ACT CGA GTT TGC CTG TCT CAA TGC TTG CTT TTT g)完全一致。以上说明慢病毒载体构建成功,可用于后续实验。"
2.1.2 慢病毒构建验证 (1)荧光显微镜下观察慢病毒感染细胞的GFP荧光标记情况:生长状态良好的293T细胞、RAW264.7细胞,慢病毒感染48 h后,荧光显微镜下观察结果:添加目的基因实验组及阴性载体对照组,因有GFP标记,所以镜下可见绿色荧光。根据公式(病毒感染率=荧光细胞数/明视野细胞数×100% )计算感染率。①如图2所示,过表达CD1d组病毒感染率为(85.462±1.316)%;过表达SIRPα组病毒感染率为(86.593±1.928)%;过表达CD1d+SIRPα共感染组病毒感染率为(79.724±1.731)%;阴性对照组病毒感染率为(80.219±1.579)%。空白对照组因未添加目的基因片段,无荧光标记,所以荧光显微镜下无绿色荧光。②如图3所示,过表达SIRPα组病毒感染率为(76.872±1.740)%;SIRPα-RNAi干扰组病毒感染率为(78.371±1.327)%;阴性对照组病毒感染率为(77.825±1.147)%。空白对照组无绿色荧光。结果提示目的基因成功感染至细胞中,可以进行下一步实验。"
(2)RT-qPCR和Western blot检测基因及蛋白表达验证慢病毒感染情况:过表达CD1d、过表达SIRPα和SIRPα-RNAi干扰慢病毒感染细胞72 h后,结果如图4所示,过表达CD1d组CD1d mRNA及蛋白表达水平较对照组明显升高(mRNA:P < 0.001;蛋白:P < 0.001);如图5所示,过表达SIRPα组SIRPα mRNA及蛋白表达水平较对照组显著升高(mRNA:P=0.002;蛋白:P=0.001);SIRPα-RNAi干扰组SIRPα mRNA及蛋白表达水平较对照组显著下降(mRNA:P < 0.001;蛋白:P=0.001)。综上所述,慢病毒转染后达到靶向调控目的基因及蛋白的作用,成功构建过表达CD1d、过表达SIRPα和SIRPα-RNAi干扰慢病毒。"
2.4 调控SIRPα基因表达后对下游基因及蛋白的影响 RT-qPCR实验结果显示,脂多糖刺激后,SIRPα-RNAi干扰组NLRP3、pro-IL-1β、pro-IL-18基因表达水平较对照组明显升高(NLRP3:P < 0.001; pro-IL-1β:P=0.019;pro-IL-18:P=0.001);过表达SIRPα组NLRP3基因表达水平较对照组明显降低(P=0.011),但pro-IL-1β、pro-IL-18基因表达水平较对照组无明显差异(pro-IL-1β:P=0.728;pro-IL-18:P=0.064),见图8,说明SIRPα基因能负向调控NLRP3、pro-IL-1β、pro-IL-18基因。琼脂糖凝胶电泳实验结果显示RT-qPCR扩增产物电泳条带位置与目的产物长度相符。"
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