The murine microglial cell line BV2 has neuroprotective effects, but is toxic to neurons by secret-ing inlfammatory cytokines, and is an important target in the treatment of nerve inlfammation and neurodegenerative di...The murine microglial cell line BV2 has neuroprotective effects, but is toxic to neurons by secret-ing inlfammatory cytokines, and is an important target in the treatment of nerve inlfammation and neurodegenerative diseases. In the present study, we observed the effects of transfecting three amyloid precursor-like protein 2 （APLP2） C-terminal fragments （CTFs; C57, C50 and C31） in the pEGFP-N1 vector on S100A9 expression in BV2 cells. Reverse transcription-PCR, western blot assay and immunocytochemistry revealed that S100A9 protein and mRNA expression was greater in BV2 cells after CTF transfection than after mock transfection with an empty vector. Furthermore, transfection of full-length APLP2-751 resulted in low levels of S100A9 protein ex-pression. Our results show that APLP2-CTFs upregulate S100A9 protein and mRNA expression in BV2 cells, and identify a novel pathway involved in neuronal injury and apoptosis, and repair and protection in Alzheimer’s disease.展开更多
目的:S100钙结合蛋白A9(S100A9)激活核因子κB(NF-κB)促进小胶质细胞toll样受体7(TLR7)的表达和炎症因子释放的作用及其机制研究。方法:CCK-8实验检测BV2小胶质细胞的增殖率;转录组测序并结合GO分析、KEGG富集分析和STRING数据库对差...目的:S100钙结合蛋白A9(S100A9)激活核因子κB(NF-κB)促进小胶质细胞toll样受体7(TLR7)的表达和炎症因子释放的作用及其机制研究。方法:CCK-8实验检测BV2小胶质细胞的增殖率;转录组测序并结合GO分析、KEGG富集分析和STRING数据库对差异基因(DEGs)进行比对并从差异表达基因中筛选出目标基因;Real time RT-PCR验证TLR7的表达;免疫荧光染色检测CD68、CD206的表达;Western Blot检测CD68、CD206、TLR7、p65、p-p65的表达;ELISA检测白细胞介素-6(IL-6)和肿瘤坏死因子-α(TNF-α)的表达。结果:中等浓度的S100A9对小胶质细胞无增殖抑制效应;实验组CD68蛋白的表达水平较对照组明显增加,而CD206蛋白的表达水平明显下降,提示S100A9促进BV2小胶质细胞向促炎型激活;Toll样受体4(TLR4)的抑制剂TAK-242明显抑制S100A9刺激BV2小胶质细胞后TNF-α和IL-6的表达水平;TLR4/NF-κB通路激活促进TLR7蛋白表达。结论:中等浓度的S100A9可以促进小胶质细胞向促炎型极化,通过激活TLR4/NF-κB通路促进TLR7表达和包括TNF-α和IL-6在内的多种炎症因子的释放,S100A9具有明显的促炎作用。展开更多
基金supported by the Natural Science Foundation of Technology Gallery in Jilin Province of China,No.2011-15237the National Natural Science Foundation of China,No.81160159
文摘The murine microglial cell line BV2 has neuroprotective effects, but is toxic to neurons by secret-ing inlfammatory cytokines, and is an important target in the treatment of nerve inlfammation and neurodegenerative diseases. In the present study, we observed the effects of transfecting three amyloid precursor-like protein 2 （APLP2） C-terminal fragments （CTFs; C57, C50 and C31） in the pEGFP-N1 vector on S100A9 expression in BV2 cells. Reverse transcription-PCR, western blot assay and immunocytochemistry revealed that S100A9 protein and mRNA expression was greater in BV2 cells after CTF transfection than after mock transfection with an empty vector. Furthermore, transfection of full-length APLP2-751 resulted in low levels of S100A9 protein ex-pression. Our results show that APLP2-CTFs upregulate S100A9 protein and mRNA expression in BV2 cells, and identify a novel pathway involved in neuronal injury and apoptosis, and repair and protection in Alzheimer’s disease.
文摘目的:S100钙结合蛋白A9(S100A9)激活核因子κB(NF-κB)促进小胶质细胞toll样受体7(TLR7)的表达和炎症因子释放的作用及其机制研究。方法:CCK-8实验检测BV2小胶质细胞的增殖率;转录组测序并结合GO分析、KEGG富集分析和STRING数据库对差异基因(DEGs)进行比对并从差异表达基因中筛选出目标基因;Real time RT-PCR验证TLR7的表达;免疫荧光染色检测CD68、CD206的表达;Western Blot检测CD68、CD206、TLR7、p65、p-p65的表达;ELISA检测白细胞介素-6(IL-6)和肿瘤坏死因子-α(TNF-α)的表达。结果:中等浓度的S100A9对小胶质细胞无增殖抑制效应;实验组CD68蛋白的表达水平较对照组明显增加,而CD206蛋白的表达水平明显下降,提示S100A9促进BV2小胶质细胞向促炎型激活;Toll样受体4(TLR4)的抑制剂TAK-242明显抑制S100A9刺激BV2小胶质细胞后TNF-α和IL-6的表达水平;TLR4/NF-κB通路激活促进TLR7蛋白表达。结论:中等浓度的S100A9可以促进小胶质细胞向促炎型极化,通过激活TLR4/NF-κB通路促进TLR7表达和包括TNF-α和IL-6在内的多种炎症因子的释放,S100A9具有明显的促炎作用。
