摘要
目的:肠道巨噬细胞定位于肠黏膜相关淋巴组织及黏膜固有层,在保持肠道稳态及免疫防御中发挥重要作用。研究脂氧素(LXs)A4及其受体激动剂BML-111对脂多糖(LPS)作用巨噬细胞RAW264.7存活和TLR4/NF-κB信号通路的影响。方法:CCK-8法观察LPS对RAW264.7的毒性作用,RT-q PCR法检测细胞内TLR4、TRAF6 m RNA的表达,Western blot法检测细胞内TLR4、TRAF6和p NF-κB p65的蛋白水平。结果:在1 000 ng/m L浓度LPS组,作用6 h后,LX A4组和BML-111组对RAW264.7细胞存活率显著增高(P<0.05)。在LPS作用下,LX A4组和BML-111组对RAW264.7细胞的TLR4 m RNA及蛋白水平显著高于相对应的无LPS组(P<0.05),TRAF6 m RNA的表达均高于相对应的无LPS组(P<0.05);而LX A4组和BML-111组的TRAF6蛋白水平则低于对照组(P<0.05),高于相对应的无LPS组(P<0.05)。在LPS作用下,LX A4组和BML-111组p NF-κB p65蛋白水平低于对照组(P<0.05),而对照组又高于相对应的无LPS组(P<0.05);且LX A4和BML-111作用无差异(P>0.05)。结论:LX A4和BML-111能够抑制LPS对RAW264.7细胞的作用及TLR4/NF-κB信号通路的激活,有助减轻炎症反应;性质稳定的BML-111更有望成为IBD治疗的新契机。
Objective To determine the effect of lipoxins （LX） A4 and its agonist （BML-111） on the survival of RAW264.7 macrophage cells and TLR4/NF-κB signaling pathway. Methods RAW264.7 cells were treated with different concentrations of LPS, then the effect of LX A4 and BML-111 on the survival rate of these cells was observed. Cytotoxicity were detected by CCK-8 method and RT-PCR was used to detect the TLR4 and TRAF6 mRNA. The protein levels of TLR4 and pNF-κB p65 in RAW264.7 were determined by Western Blot. Results The survival rates of macrophage treated with LPS for 6 h in 1 000 ng/mL LPS in LX A4 group and BML- 111 group were significantly higher than that in control group （P 〈 0.05）. In the present of LPS, the TLR4 mRNA levels in RAW264.7 cells from LX A4 group and BML-111 group were significantly higher than those in the corresponding non-LPS groups. And the TRAF6 mRNA levels in each LPS stimulation group were higher than those in the corresponding non-LPS groups （P 〈 0.05）, while the protein level of TRAF6 in LX A4 and BML-111 groups were significantly lower than that in control group （P 〈 0.05）. Stimulated with LPS, the protein levels of pNF-κB p65 in the LX A4 group and BML-111 group were all significantly lower than that in control group （P 〈 0.05）, and pNF-κB p65 expression level in control group was also significantly higher than the corresponding non-LPS groups （P 〈 0.05）. Meanwhile, no significant difference was found between LX A4 and BML-111 group （P 〉 0.05）. Conclusion LX A4 and BML-111 could inhibit the cytotoxicity of LPS on the RAW264.7 macrophage cells through the inhibition of the activation of TLR4/NF-κB signaling pathway, then reduce the inflammation. And this stable BML-111 may appear as another promising treatment for IBD disease.
出处
《实用医学杂志》
CAS
北大核心
2015年第17期2799-2802,共4页
The Journal of Practical Medicine
基金
国家自然科学基金项目(编号:81160056)
江西省教育厅项目(2012
2014)
