Objective： To observe the effect of andrographolide on the activation of mitogen-activated protein kinases （MAPKs） and expression of nuclear factor- kB （NF-kB） in macrophage foam cells. Methods： The mouse perito...Objective： To observe the effect of andrographolide on the activation of mitogen-activated protein kinases （MAPKs） and expression of nuclear factor- kB （NF-kB） in macrophage foam cells. Methods： The mouse peritoneal macrophages were cultured in the media in the presence of oxidized low-density lipoprotein （ox-LDL）, ox-LDL＋andrographolide, or neither （control）. The phosphorylation of MAPK molecules （p38MAPK, JNK, ERK1/2） and the expressions of NK- kB p65 were examined by Western blot. Results： As compared with cells in the control group, the expressions of phospho-p38 and NF- kB p65 were increased in the cells cultured with either ox-LDL or ox-LDL＋andrographolide （P〈0.01）, but attenuated significantly in the presence of ox-LDL＋ andrographolide when compared with ox-LDL （P〈0.05）. The phospho-JNK increased in the presence of either ox-LDL or ox-LDL＋andrographolide when compared with control cells （P〈0.01）, but no significant difference existed between ox-LDL and ox-LDL＋andrographolide （P〉0.05）. The expression of phospho-ERK1/2 was increased in the presence of ox-LDL compared with the control cells （P〈0.01）, but no significant differences existed between the cells cultured in the presence of ox-LDL＋andrographolide and the control medium （P〉0.05）. Conclusions： Andrographolide could inhibit the activation of ERK1/2, p38MAPK and NK-kB induced by ox-LDL in macrophage foam cells, which might be one of its mechanisms in preventing atherosclerosis.展开更多
目的观察尿毒症毒素硫酸吲哚酚(IS)是否促进巨噬泡沫细胞脂滴的蓄积,以及对细胞内B类1型清道夫受体(SR-B1)表达和核因子NF-κB活化的影响。方法体外佛波酯(PMA)诱导人源单核细胞系THP-1分化为巨噬细胞,加入氧化低密度脂蛋白(ox-LDL)培...目的观察尿毒症毒素硫酸吲哚酚(IS)是否促进巨噬泡沫细胞脂滴的蓄积,以及对细胞内B类1型清道夫受体(SR-B1)表达和核因子NF-κB活化的影响。方法体外佛波酯(PMA)诱导人源单核细胞系THP-1分化为巨噬细胞,加入氧化低密度脂蛋白(ox-LDL)培养促进巨噬细胞泡沫化,随后以不同浓度的IS干预巨噬泡沫细胞,油红O染色观察细胞内脂滴变化,实时PCR和Western blotting检测SR-B1 m RNA和蛋白表达的水平,ELISA法检测NF-κB活化情况;经NF-κB抑制剂四氢化吡咯二硫代氨基甲酸酯(PDTC)预处理后IS再干预,实时PCR检测巨噬泡沫细胞内SR-B1 m RNA表达的变化。结果与对照组(IS 0μmol/L)比较,IS干预后巨噬泡沫细胞内脂滴明显增加,随着IS浓度的升高,细胞内脂滴逐渐增加;IS干预后巨噬泡沫细胞的NF-κB活化程度增高,差异有统计学意义(P<0.05)。与对照组比较,细胞在不同浓度的IS(2.5、25、250μmol/L)处理下,SR-B1 m RNA和蛋白的表达下降,随着IS浓度的增加,SR-B1和蛋白逐渐减少,呈现浓度依赖性,差异有统计学意义(P<0.05)。PDTC预处理后SR-B1m RNA表达增加,差异有统计学意义(P<0.05)。结论 IS抑制SR-B1 m RNA和蛋白的表达,增加THP-1源性巨噬泡沫细胞胆固醇的蓄积,促进巨噬细胞泡沫化,从而促进动脉粥样硬化。NF-κB活化可能是IS抑制SR-B1 m RNA表达的可能机制之一。展开更多
Accumulation of macrophage"foam"cells,laden with cholesterol and cholesteryl ester,within the intima of large arteries,is a hallmark of early"fatty streak"lesions which can progress to complex,mult...Accumulation of macrophage"foam"cells,laden with cholesterol and cholesteryl ester,within the intima of large arteries,is a hallmark of early"fatty streak"lesions which can progress to complex,multicellular atheromatous plaques,involving lipoproteins from the bloodstream and cells of the innate and adaptive immune response.Sterol accumulation triggers induction of genes encoding proteins mediating the atheroprotective cholesterol efflux pathway.Within the arterial intima,however,this mechanism is overwhelmed,leading to distinct changes in macrophage phenotype and inflammatory status.Over the last decade marked gains have been made in understanding of the epigenetic landscape which influence macrophage function,and in particular the importance of small non-coding micro-RNA(miRNA)sequences in this context.This review identifies some of the miRNA sequences which play a key role in regulating"foam"cell formation and atherogenesis,highlighting sequences involved in cholesterol accumulation,those influencing inflammation in sterol-loaded cells,and novel sequences and pathways which may offer new strategies to influence macrophage function within atherosclerotic lesions.展开更多
文摘Objective： To observe the effect of andrographolide on the activation of mitogen-activated protein kinases （MAPKs） and expression of nuclear factor- kB （NF-kB） in macrophage foam cells. Methods： The mouse peritoneal macrophages were cultured in the media in the presence of oxidized low-density lipoprotein （ox-LDL）, ox-LDL＋andrographolide, or neither （control）. The phosphorylation of MAPK molecules （p38MAPK, JNK, ERK1/2） and the expressions of NK- kB p65 were examined by Western blot. Results： As compared with cells in the control group, the expressions of phospho-p38 and NF- kB p65 were increased in the cells cultured with either ox-LDL or ox-LDL＋andrographolide （P〈0.01）, but attenuated significantly in the presence of ox-LDL＋ andrographolide when compared with ox-LDL （P〈0.05）. The phospho-JNK increased in the presence of either ox-LDL or ox-LDL＋andrographolide when compared with control cells （P〈0.01）, but no significant difference existed between ox-LDL and ox-LDL＋andrographolide （P〉0.05）. The expression of phospho-ERK1/2 was increased in the presence of ox-LDL compared with the control cells （P〈0.01）, but no significant differences existed between the cells cultured in the presence of ox-LDL＋andrographolide and the control medium （P〉0.05）. Conclusions： Andrographolide could inhibit the activation of ERK1/2, p38MAPK and NK-kB induced by ox-LDL in macrophage foam cells, which might be one of its mechanisms in preventing atherosclerosis.
文摘目的观察尿毒症毒素硫酸吲哚酚(IS)是否促进巨噬泡沫细胞脂滴的蓄积,以及对细胞内B类1型清道夫受体(SR-B1)表达和核因子NF-κB活化的影响。方法体外佛波酯(PMA)诱导人源单核细胞系THP-1分化为巨噬细胞,加入氧化低密度脂蛋白(ox-LDL)培养促进巨噬细胞泡沫化,随后以不同浓度的IS干预巨噬泡沫细胞,油红O染色观察细胞内脂滴变化,实时PCR和Western blotting检测SR-B1 m RNA和蛋白表达的水平,ELISA法检测NF-κB活化情况;经NF-κB抑制剂四氢化吡咯二硫代氨基甲酸酯(PDTC)预处理后IS再干预,实时PCR检测巨噬泡沫细胞内SR-B1 m RNA表达的变化。结果与对照组(IS 0μmol/L)比较,IS干预后巨噬泡沫细胞内脂滴明显增加,随着IS浓度的升高,细胞内脂滴逐渐增加;IS干预后巨噬泡沫细胞的NF-κB活化程度增高,差异有统计学意义(P<0.05)。与对照组比较,细胞在不同浓度的IS(2.5、25、250μmol/L)处理下,SR-B1 m RNA和蛋白的表达下降,随着IS浓度的增加,SR-B1和蛋白逐渐减少,呈现浓度依赖性,差异有统计学意义(P<0.05)。PDTC预处理后SR-B1m RNA表达增加,差异有统计学意义(P<0.05)。结论 IS抑制SR-B1 m RNA和蛋白的表达,增加THP-1源性巨噬泡沫细胞胆固醇的蓄积,促进巨噬细胞泡沫化,从而促进动脉粥样硬化。NF-κB活化可能是IS抑制SR-B1 m RNA表达的可能机制之一。
文摘Accumulation of macrophage"foam"cells,laden with cholesterol and cholesteryl ester,within the intima of large arteries,is a hallmark of early"fatty streak"lesions which can progress to complex,multicellular atheromatous plaques,involving lipoproteins from the bloodstream and cells of the innate and adaptive immune response.Sterol accumulation triggers induction of genes encoding proteins mediating the atheroprotective cholesterol efflux pathway.Within the arterial intima,however,this mechanism is overwhelmed,leading to distinct changes in macrophage phenotype and inflammatory status.Over the last decade marked gains have been made in understanding of the epigenetic landscape which influence macrophage function,and in particular the importance of small non-coding micro-RNA(miRNA)sequences in this context.This review identifies some of the miRNA sequences which play a key role in regulating"foam"cell formation and atherogenesis,highlighting sequences involved in cholesterol accumulation,those influencing inflammation in sterol-loaded cells,and novel sequences and pathways which may offer new strategies to influence macrophage function within atherosclerotic lesions.
