金納米材料對蛋白質(zhì)淀粉樣纖維化的影響
發(fā)布時間:2018-10-08 09:16
【摘要】:目的:制備均一性、分散性良好的金納米顆粒(AuNPs),考察物理化學(xué)性質(zhì)不同的金納米棒(AuNRs)與金納米顆粒(AuNPs)對牛血清白蛋白(BSA)與雞蛋清溶菌酶(HEWL)淀粉樣纖維化的影響。方法:采用經(jīng)典Frens法制備AuNPs,通過紫外-可見吸收光譜法、動態(tài)光散射及Zeta電位分析、透射電子顯微鏡、電感耦合等離子體質(zhì)譜法對AuNRs與AuNPs的理化性質(zhì)進(jìn)行表征,評價其均一性與分散性。以BSA和HEWL作為蛋白質(zhì)淀粉樣纖維化研究對象。采用ThT熒光法、同步輻射圓二色譜法(SRCD)、原子力顯微鏡(AFM)、SDS-PAGE凝膠電泳法對形成的淀粉樣纖維進(jìn)行表征,考察AuNRs與AuNPs對淀粉樣纖維的動力學(xué)生長曲線、二級結(jié)構(gòu)、形態(tài)學(xué)及分子量的影響。結(jié)果:TEM結(jié)果顯示,AuNPs的平均尺寸為18.48±0.56 nm,Zeta電位為-36.80±0.44,濃度為155.82μg·m L-1,具有良好的均一性和分散性;AuNRs尺寸分別為20×40 nm、20×60 nm、20×80 nm,Zeta電位分別為43.13±1.16、39.83±0.76、20.40±1.11 mV。AuNRs-2、AuNRs-3、AuNRs-4與AuNPs在水溶液中的平均粒徑分別為(1.63±0.04)×(51.36±0.75)、(5.06±0.06)×(82.73±0.78)、(5.47±0.20)×(104.61±6.5)、34.29±0.19。BSA纖維化動力學(xué)曲線遵循指數(shù)型增長規(guī)律。相同濃度的AuNRs對BSA纖維化的抑制作用明顯大于AuNPs。纖維化過程中,BSA二級結(jié)構(gòu)中的α-螺旋結(jié)構(gòu)含量逐漸降低,β-折疊結(jié)構(gòu)含量逐漸升高,AuNRs與AuNPs的加入對上述過程均具有抑制作用。BSA成熟纖維形態(tài)相互纏結(jié),呈網(wǎng)狀結(jié)構(gòu),高濃度AuNRs組纖維較短且分散,AuNPs組纖維多數(shù)團聚,形成大的無定型團聚體。SDS-PAGE結(jié)果表明,高濃度AuNRs與AuNPs組BSA形成的大分子量纖維均明顯減少。HEWL纖維化動力學(xué)曲線遵循“S”型增長規(guī)律,纖維化過程中α-螺旋結(jié)構(gòu)特征峰峰位置發(fā)生藍(lán)移,AuNRs與AuNPs加入后其藍(lán)移程度增大。HEWL成熟纖維形態(tài)呈較長的絲狀纖維結(jié)構(gòu),AuNRs組HEWL形成蛋白質(zhì)的無定型聚集體,AuNPs組HEWL形成較短的絲狀纖維。結(jié)論:BSA與HEWL纖維化能夠形成形態(tài)良好的淀粉樣纖維,其具有蛋白質(zhì)淀粉樣纖維的典型屬性,AuNRs與AuNPs均可抑制兩者的纖維化,且具有濃度依賴性。相同濃度下,AuNRs的抑制作用大于AuNPs。
[Abstract]:Aim: to study the effects of gold nanorods (AuNRs) and gold nanoparticles (AuNPs) with different physical and chemical properties on bovine serum albumin (BSA) (BSA) and egg white lysozyme (HEWL) amyloid fibrosis. Methods: the physicochemical properties of AuNRs and AuNPs were characterized by classical Frens method, UV-Vis absorption spectrum, dynamic light scattering and Zeta potential analysis, transmission electron microscope and inductively coupled plasma mass spectrometry. To evaluate its uniformity and dispersion. BSA and HEWL were used as the research objects of amyloid fibrosis. The amyloid fibers were characterized by ThT fluorescence method and (AFM) SDS-PAGE gel electrophoresis with synchrotron radiation circular dichroism chromatography (SRCD), AFM). The kinetic growth curves and secondary structures of AuNRs and AuNPs on amyloid fibers were investigated. Effects of morphology and molecular weight. 緇撴灉:TEM緇撴灉鏄劇ず,AuNPs鐨勫鉤鍧囧昂瀵鎬負(fù)18.48鹵0.56 nm,Zeta鐢?shù)浣嶄福?
本文編號:2256232
[Abstract]:Aim: to study the effects of gold nanorods (AuNRs) and gold nanoparticles (AuNPs) with different physical and chemical properties on bovine serum albumin (BSA) (BSA) and egg white lysozyme (HEWL) amyloid fibrosis. Methods: the physicochemical properties of AuNRs and AuNPs were characterized by classical Frens method, UV-Vis absorption spectrum, dynamic light scattering and Zeta potential analysis, transmission electron microscope and inductively coupled plasma mass spectrometry. To evaluate its uniformity and dispersion. BSA and HEWL were used as the research objects of amyloid fibrosis. The amyloid fibers were characterized by ThT fluorescence method and (AFM) SDS-PAGE gel electrophoresis with synchrotron radiation circular dichroism chromatography (SRCD), AFM). The kinetic growth curves and secondary structures of AuNRs and AuNPs on amyloid fibers were investigated. Effects of morphology and molecular weight. 緇撴灉:TEM緇撴灉鏄劇ず,AuNPs鐨勫鉤鍧囧昂瀵鎬負(fù)18.48鹵0.56 nm,Zeta鐢?shù)浣嶄福?
本文編號:2256232
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