Objective： To study the role of nuclear factor-kappa B（NF- κB） in cholesterol efflux from THP-1 derived-foam cells treated with Angiotensin Ⅱ（Ang Ⅱ ）. Methods：Cultured THP-1 derived-foam cells were treated wi...Objective： To study the role of nuclear factor-kappa B（NF- κB） in cholesterol efflux from THP-1 derived-foam cells treated with Angiotensin Ⅱ（Ang Ⅱ ）. Methods：Cultured THP-1 derived-foam cells were treated with Ang Ⅱ or preincubated with tosyl-phenylalanine chloromethyl-ketone（TPCK） NF- κB inhibitor. The levels of activated NF- κB in the cells were examined by sandwich ELISA, Cellular cholesterol content was studied by electron microscopy scanning and zymochemistry via fluorospectrophotometer and cholesterol effiux was detected by scintillation counting technique. ABCA1 mRNA and protein were quantified by RT-PCR and Western blotting. Results：Addition of TPCK to the cells before Ang Ⅱ stimulation attenuated the response of NF- κB p65 nuclear translocation induced by Ang Ⅱ and showed no peak in foam cells group and caused a reduction in cholesterol content and an increase in cholesterol efflux by 24.1%（P〈 0.05） and 41.1%（P〈 0.05） respectively, when compared with Ang Ⅱ group. In accordance, the ABCA1 mRNA and protein were increased by 30% and 19%（P 〈 0.05） respectively, when compared with Ang Ⅱ group. Conclusion：Ang Ⅱ can downregulate ABCA1 in THP-1 derived-foam cells via NF- K B, which leads to less cholesterol effiux and the increase of cholesterol content with the consequence of the promotion of atherosclerosis.展开更多
目的分析江苏大学附属医院鲍曼不动杆菌外排泵对其耐药性形成的作用。方法收集2012年8月至2013年2月江苏大学附属医院住院患者44株鲍曼不动杆菌。应用K-B纸片扩散法检测鲍曼不动杆菌对抗生素的敏感性。经Realtime PCR法检测外排泵基因ad...目的分析江苏大学附属医院鲍曼不动杆菌外排泵对其耐药性形成的作用。方法收集2012年8月至2013年2月江苏大学附属医院住院患者44株鲍曼不动杆菌。应用K-B纸片扩散法检测鲍曼不动杆菌对抗生素的敏感性。经Realtime PCR法检测外排泵基因ade B m RNA水平。扩增外排泵调控基因ade R和ade S全长片段并测序比对。结果在44株鲍曼不动杆菌中,27株为多重耐药株且对头孢哌酮/舒巴坦、氨苄西林/舒巴坦、米诺环素较为敏感。耐药菌株ade B m RNA表达水平明显高于敏感株,且发现ade R的2639位碱基发生A→G突变,其对应的219位氨基酸则呈现AAA(赖氨酸)→GAA(谷氨酸)改变,而ade S无有义突变。结论鲍曼不动杆菌的多重耐药性可能与ade ABC外排泵系统的过表达相关,且其表达可能与调控基因ade R的突变相关。展开更多
基金the National Basic Research and Development Program of China(973 Program, No.2007CB512000) (Sub-Project,No.2007CB512005)
文摘Objective： To study the role of nuclear factor-kappa B（NF- κB） in cholesterol efflux from THP-1 derived-foam cells treated with Angiotensin Ⅱ（Ang Ⅱ ）. Methods：Cultured THP-1 derived-foam cells were treated with Ang Ⅱ or preincubated with tosyl-phenylalanine chloromethyl-ketone（TPCK） NF- κB inhibitor. The levels of activated NF- κB in the cells were examined by sandwich ELISA, Cellular cholesterol content was studied by electron microscopy scanning and zymochemistry via fluorospectrophotometer and cholesterol effiux was detected by scintillation counting technique. ABCA1 mRNA and protein were quantified by RT-PCR and Western blotting. Results：Addition of TPCK to the cells before Ang Ⅱ stimulation attenuated the response of NF- κB p65 nuclear translocation induced by Ang Ⅱ and showed no peak in foam cells group and caused a reduction in cholesterol content and an increase in cholesterol efflux by 24.1%（P〈 0.05） and 41.1%（P〈 0.05） respectively, when compared with Ang Ⅱ group. In accordance, the ABCA1 mRNA and protein were increased by 30% and 19%（P 〈 0.05） respectively, when compared with Ang Ⅱ group. Conclusion：Ang Ⅱ can downregulate ABCA1 in THP-1 derived-foam cells via NF- K B, which leads to less cholesterol effiux and the increase of cholesterol content with the consequence of the promotion of atherosclerosis.
文摘目的分析江苏大学附属医院鲍曼不动杆菌外排泵对其耐药性形成的作用。方法收集2012年8月至2013年2月江苏大学附属医院住院患者44株鲍曼不动杆菌。应用K-B纸片扩散法检测鲍曼不动杆菌对抗生素的敏感性。经Realtime PCR法检测外排泵基因ade B m RNA水平。扩增外排泵调控基因ade R和ade S全长片段并测序比对。结果在44株鲍曼不动杆菌中,27株为多重耐药株且对头孢哌酮/舒巴坦、氨苄西林/舒巴坦、米诺环素较为敏感。耐药菌株ade B m RNA表达水平明显高于敏感株,且发现ade R的2639位碱基发生A→G突变,其对应的219位氨基酸则呈现AAA(赖氨酸)→GAA(谷氨酸)改变,而ade S无有义突变。结论鲍曼不动杆菌的多重耐药性可能与ade ABC外排泵系统的过表达相关,且其表达可能与调控基因ade R的突变相关。
