目的观察GPR120基因对脓毒症进展的作用,探索GPR120基因对胞内多蛋白复合物—NLRP3(NOD-,LRR-and pyrin domain-containing protein 3)及巨噬细胞极化的调控作用。方法收集临床脓毒症患者血液及胸水样本后,采用流式及ELISA实验检测炎症...目的观察GPR120基因对脓毒症进展的作用,探索GPR120基因对胞内多蛋白复合物—NLRP3(NOD-,LRR-and pyrin domain-containing protein 3)及巨噬细胞极化的调控作用。方法收集临床脓毒症患者血液及胸水样本后,采用流式及ELISA实验检测炎症因子及炎症小体相关蛋白表达。利用细菌脂多糖(lipopolysaccharide,LPS)处理C57BL/6小鼠及单核-巨噬细胞株Raw264.7构建体内外脓毒症模型,并通过GPR120基因激动剂TUG891的干预,观察对照组和脓毒症组间GPR120基因、NLRP3炎症小体蛋白及巨噬细胞极化蛋白的表达差异。结果在临床标本中检测发现,与对照组相比脓毒症患者血清中IL-1β等炎症因子表达明显升高(P<0.001),胸水中NLRP3、Caspase-1及IL-1β等炎症小体蛋白的表达水平也明显升高(P均<0.05)。体内实验发现LPS诱导的急性肺损伤动物模型中肺组织内重度炎症表现,肺组织内GPR120基因表达下降,小鼠血清中炎症因子表达上调(P<0.01),炎症小体激活相关蛋白的表达增强,巨噬细胞M1型极化增强。通过TUG891激活GPR120基因,可减轻小鼠及细胞的炎症反应,抑制NLRP3炎症小体激活,促进巨噬细胞M2极化(P<0.01)。体外实验证实了LPS可抑制细胞内GPR120蛋白的表达并促进炎症蛋白的分泌,而TUG891促进GPR120蛋白水平的上调表达并对炎症因子的分泌具有缓解作用(P<0.05)。结论在脓毒症中,GPR120基因激活可抑制NLRP3炎症小体的活化,促进巨噬细胞修复型极化,减轻组织炎症损伤,从而延缓脓毒症的快速进展。展开更多
AIM:To evaluate the role of reactive oxygen speciesendoplasmic reticulum stress(ROS-ERS)in the cellular protection of G protein-coupled receptor 120(GPR120/FFAR4)against high glucose(HG)induced human retinal vascular ...AIM:To evaluate the role of reactive oxygen speciesendoplasmic reticulum stress(ROS-ERS)in the cellular protection of G protein-coupled receptor 120(GPR120/FFAR4)against high glucose(HG)induced human retinal vascular endothelial cell(HRVEC)injury and its underlying mechanisms.METHODS:HRVECs were divided into the control group,GW9508(an agonist of GPR120)group,HG group,and HG+GW9508 group.The cell proliferation and apoptosis were assessed by cell counting kit-8 and annexin V-FITC/PI apoptosis detection kit,respectively.Western blotting analysis was performed to assess the protein expressions of Bax,Bcl-2,activating transcription factor 6(ATF6),PKRlike endoplasmic reticulum kinase(PERK),and inositolrequiring enzyme 1(IRE1).The ROS assay kit was used for the detection of ROS production.Then the cells were transfected with siRNA of GPR120 and the ROS level and protein levels of ATF6,PERK,and IER1 were compared.RESULTS:GW9508 promoted the proliferation of HRVECs,which was significantly reduced by the stimulation of HG.GW9508 remarkably reduced the apoptosis rate of HRVECs under HG and the expression of proapoptotic protein Bax,while increased the expression of antiapoptotic protein Bcl-2.Under HG condition,a significant increase of ROS production was noticed in HRVECs,and GW9508 treatment greatly decreased it.The over-expressions of ERS-related proteins ATF6,PERK,and IER1 under HG were down-regulated by GW9508 treatment.After successfully transfected with siGPR120,the effects of GW9508 on the production of ROS as well as the expressions of ATF6,PERK,and IER1 were reversed.CONCLUSION:GPR120 protects HRVECs against HG induced apoptosis,and suppressing ROS-ERS pathway is one of the mechanisms involved.Activation of GPR120 may be considered as a potential therapeutic target for diabetic retinopathy.展开更多
目的通过脂多糖(Lipopolysaccharide,LPS)诱导的脓毒症模型验证G蛋白偶联受体120(G-protein coupled receptor120,GPR120)基因对NOD样受体热蛋白结构域相关蛋白3(NOD-like receptor thermal protein domain associated protein 3,NLRP3...目的通过脂多糖(Lipopolysaccharide,LPS)诱导的脓毒症模型验证G蛋白偶联受体120(G-protein coupled receptor120,GPR120)基因对NOD样受体热蛋白结构域相关蛋白3(NOD-like receptor thermal protein domain associated protein 3,NLRP3)炎症小体及肺损伤的影响,并探索其调控分子机制。方法通过C57BL/6小鼠构建体内脓毒症模型,通过GPR120基因激动剂TUG891进行干预,验证GPR120基因对脓毒症小鼠肺损伤的保护作用;然后进行转录组测序,筛选差异信号通路,并在动物模型中验证NLRP3炎症小体及调控蛋白的差异表达。通过慢病毒转染构建GPR120基因过表达/低表达的Raw264.7单核巨噬细胞株,观察GPR120基因对NLRP3炎症小体的调控作用。结果与脓毒症组相比,LPS+TUG891组小鼠肺组织中包括cAMP通路基因在内的77个基因表达显著上调,37个基因表达下降。LPS组的GPR120水平较正常对照组显著降低,同时cAMP/PKA信号通路关键蛋白CREB及PKA表达减少,NLRP3、Caspase-1及IL-1β等炎症小体激活相关蛋白水平升高(P<0.01),予以TUG891处理后,组织内GPR120表达回升,cAMP/PKA信号通路重新被激活(P<0.01),NLRP3炎症小体蛋白活化程度下降(P<0.05)。体外实验中,LPS诱导的脓毒症可引起细胞增殖活性下降,GPR120基因在脓毒症巨噬细胞中表达减低(P<0.001),通过干预GPR120基因表达,证实GPR120基因可负性调控NLRP3炎症小体的活化程度及细胞炎症反应(P<0.01)。结论脓毒症中GPR120基因的激活可通过抑制NLRP3炎症小体的活化,减轻脓毒症的炎症反应及肺损伤。展开更多
文摘目的观察GPR120基因对脓毒症进展的作用,探索GPR120基因对胞内多蛋白复合物—NLRP3(NOD-,LRR-and pyrin domain-containing protein 3)及巨噬细胞极化的调控作用。方法收集临床脓毒症患者血液及胸水样本后,采用流式及ELISA实验检测炎症因子及炎症小体相关蛋白表达。利用细菌脂多糖(lipopolysaccharide,LPS)处理C57BL/6小鼠及单核-巨噬细胞株Raw264.7构建体内外脓毒症模型,并通过GPR120基因激动剂TUG891的干预,观察对照组和脓毒症组间GPR120基因、NLRP3炎症小体蛋白及巨噬细胞极化蛋白的表达差异。结果在临床标本中检测发现,与对照组相比脓毒症患者血清中IL-1β等炎症因子表达明显升高(P<0.001),胸水中NLRP3、Caspase-1及IL-1β等炎症小体蛋白的表达水平也明显升高(P均<0.05)。体内实验发现LPS诱导的急性肺损伤动物模型中肺组织内重度炎症表现,肺组织内GPR120基因表达下降,小鼠血清中炎症因子表达上调(P<0.01),炎症小体激活相关蛋白的表达增强,巨噬细胞M1型极化增强。通过TUG891激活GPR120基因,可减轻小鼠及细胞的炎症反应,抑制NLRP3炎症小体激活,促进巨噬细胞M2极化(P<0.01)。体外实验证实了LPS可抑制细胞内GPR120蛋白的表达并促进炎症蛋白的分泌,而TUG891促进GPR120蛋白水平的上调表达并对炎症因子的分泌具有缓解作用(P<0.05)。结论在脓毒症中,GPR120基因激活可抑制NLRP3炎症小体的活化,促进巨噬细胞修复型极化,减轻组织炎症损伤,从而延缓脓毒症的快速进展。
文摘AIM:To evaluate the role of reactive oxygen speciesendoplasmic reticulum stress(ROS-ERS)in the cellular protection of G protein-coupled receptor 120(GPR120/FFAR4)against high glucose(HG)induced human retinal vascular endothelial cell(HRVEC)injury and its underlying mechanisms.METHODS:HRVECs were divided into the control group,GW9508(an agonist of GPR120)group,HG group,and HG+GW9508 group.The cell proliferation and apoptosis were assessed by cell counting kit-8 and annexin V-FITC/PI apoptosis detection kit,respectively.Western blotting analysis was performed to assess the protein expressions of Bax,Bcl-2,activating transcription factor 6(ATF6),PKRlike endoplasmic reticulum kinase(PERK),and inositolrequiring enzyme 1(IRE1).The ROS assay kit was used for the detection of ROS production.Then the cells were transfected with siRNA of GPR120 and the ROS level and protein levels of ATF6,PERK,and IER1 were compared.RESULTS:GW9508 promoted the proliferation of HRVECs,which was significantly reduced by the stimulation of HG.GW9508 remarkably reduced the apoptosis rate of HRVECs under HG and the expression of proapoptotic protein Bax,while increased the expression of antiapoptotic protein Bcl-2.Under HG condition,a significant increase of ROS production was noticed in HRVECs,and GW9508 treatment greatly decreased it.The over-expressions of ERS-related proteins ATF6,PERK,and IER1 under HG were down-regulated by GW9508 treatment.After successfully transfected with siGPR120,the effects of GW9508 on the production of ROS as well as the expressions of ATF6,PERK,and IER1 were reversed.CONCLUSION:GPR120 protects HRVECs against HG induced apoptosis,and suppressing ROS-ERS pathway is one of the mechanisms involved.Activation of GPR120 may be considered as a potential therapeutic target for diabetic retinopathy.
文摘【目的】探讨钙信号对小鼠脂肪组织中GPR120基因转录及脂肪生成的影响。【方法】用外源性葡萄糖酸钙和二氢吡啶钙离子通道的阻滞剂Nifedipine处理小鼠30 d,记录小鼠体质量的变化,测定小鼠皮下脂肪、附睾脂肪和肾周脂肪的沉积量,检测血清中甘油三酯(TG)、总胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)和低密度脂蛋白胆固醇(LDL-C)的浓度,同时利用Real-ti me PCR法分析GPR120基因及与脂肪生成密切相关的转录因子PPARγ、C/EBPα和脂解基因HSL、生脂基因FASmRNA的表达情况,用SPSS软件分析小鼠附睾脂肪中GPR120与脂代谢相关基因表达的相关性。【结果】葡萄糖酸钙可延缓小鼠体质量的增加,减少体脂含量(P<0.01),并使小鼠血清中的TG、TC和LDL-C浓度极显著降低(P<0.01),HDL-C浓度显著升高(P<0.05),可导致GPR120、PPARγ、C/EBPα和FAS的mRNA表达水平降低,且分别达到极显著(P<0.01)或显著(P<0.05)水平,并可使HSLmRNA表达水平极显著升高(P<0.01);Nifedipine处理能使小鼠体质量增加(P<0.05),促进体脂沉积(P<0.01),并使小鼠血清中的TG和TC浓度显著升高(分别为P<0.05和P<0.01),GPR120、PPARγ、C/EBPα和FAS的mRNA表达水平极显著升高(P<0.01),但却使HSLmRNA的表达水平极显著降低(P<0.01)。相关性分析表明,GPR120 mRNA的表达水平与PPARγ、FAS和C/EBPα间呈显著正相关。【结论】钙信号在GPR120调节小鼠脂肪生成的过程中可能起到负调控作用。
文摘目的通过脂多糖(Lipopolysaccharide,LPS)诱导的脓毒症模型验证G蛋白偶联受体120(G-protein coupled receptor120,GPR120)基因对NOD样受体热蛋白结构域相关蛋白3(NOD-like receptor thermal protein domain associated protein 3,NLRP3)炎症小体及肺损伤的影响,并探索其调控分子机制。方法通过C57BL/6小鼠构建体内脓毒症模型,通过GPR120基因激动剂TUG891进行干预,验证GPR120基因对脓毒症小鼠肺损伤的保护作用;然后进行转录组测序,筛选差异信号通路,并在动物模型中验证NLRP3炎症小体及调控蛋白的差异表达。通过慢病毒转染构建GPR120基因过表达/低表达的Raw264.7单核巨噬细胞株,观察GPR120基因对NLRP3炎症小体的调控作用。结果与脓毒症组相比,LPS+TUG891组小鼠肺组织中包括cAMP通路基因在内的77个基因表达显著上调,37个基因表达下降。LPS组的GPR120水平较正常对照组显著降低,同时cAMP/PKA信号通路关键蛋白CREB及PKA表达减少,NLRP3、Caspase-1及IL-1β等炎症小体激活相关蛋白水平升高(P<0.01),予以TUG891处理后,组织内GPR120表达回升,cAMP/PKA信号通路重新被激活(P<0.01),NLRP3炎症小体蛋白活化程度下降(P<0.05)。体外实验中,LPS诱导的脓毒症可引起细胞增殖活性下降,GPR120基因在脓毒症巨噬细胞中表达减低(P<0.001),通过干预GPR120基因表达,证实GPR120基因可负性调控NLRP3炎症小体的活化程度及细胞炎症反应(P<0.01)。结论脓毒症中GPR120基因的激活可通过抑制NLRP3炎症小体的活化,减轻脓毒症的炎症反应及肺损伤。
