Inclusion behavior of oxybutynin （OBN） with hydroxypropyl-β-cyclodextrin （HP-β-CD） was investigated by ultraviolet absorption spectrum and fluorescence spectrum. A reliable determination of the complex stoichiom...Inclusion behavior of oxybutynin （OBN） with hydroxypropyl-β-cyclodextrin （HP-β-CD） was investigated by ultraviolet absorption spectrum and fluorescence spectrum. A reliable determination of the complex stoichiometry was provided by the continuous variation technique. Alcohol was added to further investigate the mechanism of the inclusion behavior. Thermodynamic constants AG, AH and AS for inclusion interaction of OBN and HP-β-CD were determined. The results show that host-guest complex with molar ratio of 1：1 is formed, and inclusion stability constant between OBN and HP-β-CD is 54.9 L/mol determined by ultraviolet spectrum and 11.1 L/mol determined by fluorescence spectrum. OBN has weak binding ability with HP-β-CD in aqueous solution （stability constant 〈102 L/mol） and addition of alcohol leads to a decrease of stability constant, which indicates that the hydrophobic force contributes to the inclusion process. AG, AH and AS are all less than zero, which indicates that the inclusion process is a spontaneous and exothermic process.展开更多
目的探讨姜黄素衍生物——联氨基姜黄素(hydrazinocurcumin,HC)通过抑制STAT3(signal transduction and activators of transcription-3)信号通路对乳腺癌细胞MDA-MB-231侵袭迁移性的影响。方法以人乳腺癌细胞株MDA-MB-231为研究对象,分...目的探讨姜黄素衍生物——联氨基姜黄素(hydrazinocurcumin,HC)通过抑制STAT3(signal transduction and activators of transcription-3)信号通路对乳腺癌细胞MDA-MB-231侵袭迁移性的影响。方法以人乳腺癌细胞株MDA-MB-231为研究对象,分DMSO对照组和HC处理组。采用MTT法检测HC对MDA-MB-231乳腺癌细胞的生长抑制作用,刘氏染色检测细胞形态学改变,Transwell小室检测细胞侵袭能力,细胞划痕试验检测细胞迁移能力,Western blot检测STAT3、p-STAT3、MMP-9及MMP-2的蛋白表达水平。结果 MTT检测显示,HC处理的细胞生长受到抑制,其抑制率呈时间-剂量依赖关系;刘氏染色发现处理细胞形态发生改变,细胞变圆;Transwell小室检测显示对照组穿膜细胞数为(598.00±21.28)/视野,而10、20μmol/LHC处理后透膜细胞数分别为(94.00±6.56)/视野和(4.00±1.00)/视野,穿膜细胞数显著低于对照组(P<0.05);划痕试验表明对照组划痕闭合率约为54%,而10、20μmol/LHC处理组基本无闭合(P<0.05);Westernblot检测显示,不同浓度HC处理MDA-MB-231细胞后,p-STAT3明显降低,而总STAT3水平无明显差异,MMP-9、MMP-2的表达也有减少。结论 HC可以通过抑制STAT3的活化(即p-STAT3),降低MMP-9、MMP-2的蛋白表达水平,从而抑制乳腺癌细胞MDA-MB-231的侵袭迁移性。展开更多
Curcumin(N1),demethoxycurcumin(N2) and bisdemethoxycurcumin(N3) were isolated from the extract of Curcuma longa(turmeric),and curcumin derivatives(N11～N14) were synthesized.Curcuminoids and curcumin derivatives were ...Curcumin(N1),demethoxycurcumin(N2) and bisdemethoxycurcumin(N3) were isolated from the extract of Curcuma longa(turmeric),and curcumin derivatives(N11～N14) were synthesized.Curcuminoids and curcumin derivatives were evaluated in vitro for the aldose reductase inhibitory activity.The results showed that curcuminoids and curcumin derivatives with hydroxyl or carboxyl acid groups exerted inhibitory activities on aldose reductase,and curcuminoid(N1) and curcumin derivative compound(N13) exhibited potential inhibitory activities.展开更多
基金Project(20976041) supported by the National Natural Science Foundation of China
文摘Inclusion behavior of oxybutynin （OBN） with hydroxypropyl-β-cyclodextrin （HP-β-CD） was investigated by ultraviolet absorption spectrum and fluorescence spectrum. A reliable determination of the complex stoichiometry was provided by the continuous variation technique. Alcohol was added to further investigate the mechanism of the inclusion behavior. Thermodynamic constants AG, AH and AS for inclusion interaction of OBN and HP-β-CD were determined. The results show that host-guest complex with molar ratio of 1：1 is formed, and inclusion stability constant between OBN and HP-β-CD is 54.9 L/mol determined by ultraviolet spectrum and 11.1 L/mol determined by fluorescence spectrum. OBN has weak binding ability with HP-β-CD in aqueous solution （stability constant 〈102 L/mol） and addition of alcohol leads to a decrease of stability constant, which indicates that the hydrophobic force contributes to the inclusion process. AG, AH and AS are all less than zero, which indicates that the inclusion process is a spontaneous and exothermic process.
文摘目的探讨姜黄素衍生物——联氨基姜黄素(hydrazinocurcumin,HC)通过抑制STAT3(signal transduction and activators of transcription-3)信号通路对乳腺癌细胞MDA-MB-231侵袭迁移性的影响。方法以人乳腺癌细胞株MDA-MB-231为研究对象,分DMSO对照组和HC处理组。采用MTT法检测HC对MDA-MB-231乳腺癌细胞的生长抑制作用,刘氏染色检测细胞形态学改变,Transwell小室检测细胞侵袭能力,细胞划痕试验检测细胞迁移能力,Western blot检测STAT3、p-STAT3、MMP-9及MMP-2的蛋白表达水平。结果 MTT检测显示,HC处理的细胞生长受到抑制,其抑制率呈时间-剂量依赖关系;刘氏染色发现处理细胞形态发生改变,细胞变圆;Transwell小室检测显示对照组穿膜细胞数为(598.00±21.28)/视野,而10、20μmol/LHC处理后透膜细胞数分别为(94.00±6.56)/视野和(4.00±1.00)/视野,穿膜细胞数显著低于对照组(P<0.05);划痕试验表明对照组划痕闭合率约为54%,而10、20μmol/LHC处理组基本无闭合(P<0.05);Westernblot检测显示,不同浓度HC处理MDA-MB-231细胞后,p-STAT3明显降低,而总STAT3水平无明显差异,MMP-9、MMP-2的表达也有减少。结论 HC可以通过抑制STAT3的活化(即p-STAT3),降低MMP-9、MMP-2的蛋白表达水平,从而抑制乳腺癌细胞MDA-MB-231的侵袭迁移性。
文摘Curcumin(N1),demethoxycurcumin(N2) and bisdemethoxycurcumin(N3) were isolated from the extract of Curcuma longa(turmeric),and curcumin derivatives(N11～N14) were synthesized.Curcuminoids and curcumin derivatives were evaluated in vitro for the aldose reductase inhibitory activity.The results showed that curcuminoids and curcumin derivatives with hydroxyl or carboxyl acid groups exerted inhibitory activities on aldose reductase,and curcuminoid(N1) and curcumin derivative compound(N13) exhibited potential inhibitory activities.
