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食品研究与开发:2021,42(19):1-7
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红景天苷抑制淀粉样β蛋白聚集和降低其细胞毒性的研究
(1.天津科技大学食品营养与安全国家重点实验室,天津 300457;2.南开大学医学院,天津 300071)
多酚;红景天苷抑制剂;阿尔兹海默症;纤维;分子对接
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投稿时间:2021-05-30    
中文摘要: 该文利用硫黄素T(thioflavin T,ThT)荧光、刚果红、透射电子显微镜、圆二色谱(circular dichroism,CD)、细胞试验和分子对接等方法,对红景天苷抑制β-淀粉样蛋白40(amyloid β-peptide 40,Aβ40)的聚集、缓解细胞毒性进行分析。ThT荧光、刚果红和透射电镜试验均证明红景天苷能抑制Aβ40聚集,且呈剂量依赖性,当红景天苷的浓度为2.0×10-4mol/L时,ThT荧光强度降低约(61.86±0.96)%。圆二色谱结果表明,红景天苷能减少β-折叠结构的形成。此外,红景天苷还能缓解Aβ40诱导的细胞毒性,在浓度为2.0×10-4mol/L时,使细胞稳定性从(46.67±1.70)%提高到(80.89±1.23)%。分子对接表明,红景天苷可与Aβ40通过氢键结合,并稳定其α-螺旋构象。
Abstract:The inhibitory ability of salidroside on aggregation and cytotoxicity of amyloid β-peptide 40(Aβ40)was methodically analyzed using thioflavin T(ThT)fluorescence,Congo red transmission electron microscope(TEM),circular dichroism(CD),cell test and molecular docking.ThT,Congo red and TEM experiments showed that salidroside could inhibit Aβ40 aggregation in a dose-dependent manner.When salidroside concentration was increased to 2.0×10-4mol/L,ThT intensity decreased by(61.86±0.96)%.CD results revealed that salidroside could reduce the formation of β -sheet structures.Moreover,salidroside attenuated Aβ40-induced cytotoxicity,which increased cell viability from(46.67±1.70)% to(80.89±1.23)%,at a concentration of 2.0×10-4mol/L.In addition,molecular docking showed that salidroside could directly bind to Aβ40 and stabilize α-helical structure.
文章编号:202119001     中图分类号:    文献标志码:
基金项目:国家自然科学基金(21575102);国家重点研发计划(2020YFF0305002)
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