CN110759926B - 基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体及在细胞磷光成像的应用 - Google Patents
基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体及在细胞磷光成像的应用 Download PDFInfo
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Abstract
Description
【技术领域】
本发明涉及细胞成像技术领域,特别是一种基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体及其在细胞磷光成像方面的潜在应用。
【背景技术】
细胞成像具有诸多应用而被广泛关注,例如亚细胞定位等,此外磷光细胞成像具有其独特的优势(例如成像干扰少等)。传统的室温磷光分子在用于细胞的磷光成像时往往具有有毒的金属原子而不适用,纯有机分子因为自旋耦合能力弱难以发射有效的磷光,而具有水溶性好、无金属、低毒性的特点的纯有机室温磷光组装体仍是巨大的挑战。基于超分子大环的组装体在用于细胞磷光成像时具备以下几方面的优势:(1)大环主体的疏水空腔以及稳定的特异性结合能够增强和激活客体分子的磷光以及防止磷光被淬灭剂淬灭;(2)大环的刚性结构可以将客体分子包裹在内部而降低毒性。因此,靶向的苯基吡啶衍生物-葫芦脲超分子组装体为我们提供了一种简便的超分子组装方法来实现在水中的室温磷光,它可能被发展成为磷光的靶向成像的有效方法。
【发明内容】
本发明的目的是针对传统的室温磷光分子含有有毒金属以及纯有机分子难以发射有效磷光的问题,提供了一种基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体,并研究了其在细胞靶向磷光成像方面的潜在应用。该组装体是基于二乙醇胺修饰的苯基吡啶盐(LG)和葫芦脲-8(CB[8])之间的主客体相互作用构筑的,CB[8]通过与苯基吡啶形成1:2的络合物来激活增强磷光,此外组装体在细胞成像中具有线粒体靶向性,从而可以作为增强磷光以及细胞靶向成像的一种新的策略。
本发明的技术方案:
一种基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体,其构筑单元以葫芦脲-8(CB[8])为主体,以二乙醇胺修饰的苯基吡啶盐(LG)为客体,通过超分子主客体相互作用构筑了苯基吡啶衍生物-葫芦脲超分子假轮烷组装体,其构筑单元以及组装体结构的化学结构式如下:
一种基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体的制备方法,包括以下步骤:
步骤1、二乙醇胺修饰的苯基吡啶盐(LG)的制备;
1)二乙醇胺修饰的苯基吡啶盐中间体LG-I的合成
将化合物4-(4-溴苯基)吡啶(4.27mmol,1.00g)和氯乙酸甲酯(4.70mmol,0.51g)的反应混合物溶解在乙腈(25mL)中,在回流条件下搅拌过夜,然后将混合物过滤。用乙腈洗涤固体(25mL×2)得到白色固体二乙醇胺修饰的苯基吡啶盐中间体LG-I;
2)二乙醇胺修饰的苯基吡啶盐(LG)的合成
将中间体LG-I(4.27mmol,1.00g)和二乙醇胺(2.00mmol,0.51mg)的反应混合物溶解在乙腈(25mL)中,在回流条件下搅拌过夜,然后将混合物过滤。用乙腈洗涤固体(25mL×2)得到黄色固体二乙醇胺修饰的苯基吡啶盐LG。
将步骤1制备的LG和CB[8]固体样品按照2:1的摩尔比进行称量,溶解在氘代的水或二次水中,超声20分钟,使反应体系充分溶解和组装,得到目标产物超分子组装体水溶液。
将配制好的苯基吡啶衍生物-葫芦脲超分子组装体水溶液,进行紫外-可见光吸收滴定表征,分析苯基吡啶衍生物-葫芦脲超分子组装体的组装模式和键合常数。其中,LG的浓度固定为2.0×10-5M-1,CB[8]的浓度为0-3.0×10-5M-1。
通过共聚焦激光扫描显微镜观察和LG单体孵育的A549细胞,发现LG/CB[8]组装物可以很容易进入细胞内,并显示出有效的绿色磷光,与线粒体标记物Mitotracker红色具有很好的共域性。这说明组装LG/CB[8]是一种有效的活细胞线粒体荧光成像探针。
我们采用了MTT方法研究了LG以及的细胞毒性。当浓度低于0.01mM([CB[8]]=0.01mM,[LG]=0.05mM)时,组装体对A549细胞(癌细胞系)或NIH3T3细胞(正常细胞系)几乎没有毒性。
本发明的优点和有益效果是:
1)该超分子组装体在室温以及无需除氧的条件即可实现在水中有效的磷光;2)组装体具有较低的生物毒性,并且能线粒体靶向成像;3)该超分子组装体的制备方法简单、易于实施且效果特别好,使其在细胞成像方面具有潜在的应用。
【附图说明】
图1为二乙醇胺修饰的苯基吡啶盐LG及其中间体LG-I的合成路线图。
图2为苯基吡啶衍生物-葫芦脲超分子组装体细胞靶向成像的示意图。
图3为苯基吡啶衍生物中间体LG-I的核磁氢谱谱图。
图4为苯基吡啶衍生物中间体LG-I的碳谱谱图。
图5为苯基吡啶衍生物中间体LG-I的高分辨质谱图。
图6为苯基吡啶衍生物LG的核磁氢谱谱图。
图7为苯基吡啶衍生物LG的碳谱谱图。
图8为苯基吡啶衍生物LG的高分辨质谱图。
图10为LG随着CB[8]浓度不断增大的紫外-可见吸收滴定谱图。
图11为LG和CB[8]的Job图。
【具体实施方式】
下面结合附图对本发明做进一步的说明:
实施例1:
一种基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体,其构筑单元以CB[8]为主体,以二乙醇胺修饰的苯基吡啶盐(LG)为客体,通过超分子主客体相互作用构筑了苯基吡啶-葫芦脲超分子组装体,其构筑单元以及组装体结构的化学结构式如下:
本发明提供的基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体的制备方法,包括以下步骤:
步骤1、二乙醇胺修饰的苯基吡啶盐(LG)的制备;
参见附图1,步骤如下:
1)二乙醇胺修饰的苯基吡啶盐中间体LG-I的合成
将化合物4-(4-溴苯基)吡啶(4.27mmol,1.00g)和氯乙酸甲酯(4.70mmol,0.51g)的反应混合物溶解在乙腈(25mL)中,在回流条件下搅拌过夜,然后将混合物过滤。用乙腈洗涤固体(25mL×2)得到白色固体二乙醇胺修饰的苯基吡啶盐中间体LG-I;
2)二乙醇胺修饰的苯基吡啶盐(LG)的合成
将中间体LG-I(4.27mmol,1.00g)和二乙醇胺(2.00mmol,0.51mg)的反应混合物溶解在乙腈(25mL)中,在85℃下搅拌过夜,然后将混合物过滤。用乙腈洗涤固体(25mL×2)得到黄色固体二乙醇胺修饰的苯基吡啶盐。
图3为二乙醇胺修饰的苯基吡啶盐中间体LG-I的核磁氢谱谱图。图中表明:二乙醇胺修饰的苯基吡啶盐中间体LG-I结构正确。
图4为二乙醇胺修饰的苯基吡啶盐中间体LG-I的碳谱谱图。图中表明:二乙醇胺修饰的苯基吡啶盐中间体LG-I结构正确。
图5为二乙醇胺修饰的苯基吡啶盐中间体LG-I的高分辨质谱图。图中表明:二乙醇胺修饰的苯基吡啶盐中间体LG-I结构正确。
图6为二乙醇胺修饰的苯基吡啶盐LG的核磁氢谱谱图。图中表明:二乙醇胺修饰的苯基吡啶盐LG结构正确。
图7为二乙醇胺修饰的苯基吡啶盐LG的碳谱谱图。图中表明:二乙醇胺修饰的苯基吡啶盐LG结构正确。
图8为二乙醇胺修饰的苯基吡啶盐LG的高分辨质谱图。图中表明:二乙醇胺修饰的苯基吡啶盐LG结构正确。
将制备好的苯基吡啶衍生物-葫芦脲超分子组装体水溶液,进行紫外-可见光吸收滴定表征,分析苯基吡啶衍生物-葫芦脲超分子组装体的组装模式和键合常数。其中,LG的浓度固定为2.0×10-5M-1,CB[8]的浓度为0-3.0×10-5M-1。
图10为LG随着CB[8]浓度不断增大的紫外-可见光吸收滴定图。图中表明:LG分子中的苯基吡啶部分与CB[8]形成了包合物,并且主客体包合影响客体的紫外吸收。
图11为LG和CB[8]的Job图。图中表明:确定了LG分子中的苯基吡啶部分与CB[8]形成了2:1的包合物。
通过共聚焦激光扫描显微镜观察和LG单体孵育的A549细胞,发现LG/CB[8]组装物可以很好的进入细胞,并显示出有效的绿色磷光,与线粒体标记物Mitotracker红色具有很好的共域性。这说明组装LG/CB[8]是一种有效的活细胞线粒体荧光成像探针。
我们采用了MTT方法研究了LG以及的细胞毒性。当浓度低于0.01mM([CB[8]]=0.01mM,[LG]=0.05mM)时,组装体对A549细胞(癌细胞系)或NIH3T3细胞(正常细胞系)几乎没有毒性。此外可以发现组装体与单独的客体LG相比,毒性更低。
Claims (5)
2.一种基于水溶性的苯基吡啶衍生物-葫芦脲超分子假轮烷组装体的制备方法,包括以下步骤:
步骤1、二乙醇胺修饰的苯基吡啶盐(LG)的制备;
1)二乙醇胺修饰的苯基吡啶盐中间体LG-I的合成
将质量为1.00g的化合物4-(4-溴苯基)吡啶和0.51g氯乙酸甲酯溶解在25mL乙腈中,在回流条件下搅拌过夜,然后将混合物过滤,用25mL乙腈洗涤固体两次得到白色固体二乙醇胺修饰的苯基吡啶盐中间体LG-I;
2)二乙醇胺修饰的苯基吡啶盐(LG)的合成
将质量为1.00g的中间体LG-I和0.51mg二乙醇胺溶解在25mL乙腈中,在85℃下搅拌过夜,然后将混合物过滤,用25mL乙腈洗涤固体两次得到黄色固体二乙醇胺修饰的苯基吡啶盐;
5.根据权利要求4所述的制备方法,其特征在于,该方法还包括:
通过共聚焦激光扫描显微镜观察和LG单体孵育的A549细胞,发现LG/CB[8]组装物可以很容易进入细胞内,并显示出有效的绿色磷光,与线粒体标记物Mitotracker红色具有很好的共域性;这说明组装体LG/CB[8]是一种有效的活细胞线粒体荧光成像探针;
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