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Unsymmetric vesicles with a different design on each side for near-infrared fluorescence imaging of tumor tissues

机译:在每侧具有不同设计的非对称囊泡,用于肿瘤组织的近红外荧光成像

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摘要

Spherical vesicular assemblies with unsymmetric membranes are prepared from A(3)B-type and AB'-type peptides with different helix senses in the hydrophobic B and B' blocks under the control of three associated factors: stereo-complex formation, dipole-dipole interactions, and steric effects. [(Sar)(26)](3)-b-(L-Leu-Aib)(6) (A(3)BL), (Sar)(27)-b-(L-Leu-Aib)(6) (ABL), (Sar)(28)-b-(D-Leu-Aib)(6) (ABD), lipoic-acid terminated ABL (lipoABL), and lipoic-acid terminated ABD (lipoABD) are mixed while keeping equimolar ratios of the total amounts of the right- and the left-handed helices. When A(3)BL exceeds more than 60% of all the righthanded helices of the mixture, the unsymmetric vesicles are formed, as indicated by the selective adsorption of gold nanoparticles on the vesicle surface observed by TEM. The unsymmetric vesicles are also prepared using ICGABL and ICGABD with a near-infrared fluorophore, indocyanine green (ICG), at the terminals of ABL and ABD. The unsymmetric vesicle formation is verified by fluorescence quenching with the addition of In ions to the solution. When these vesicles are injected into tumor-bearing mice, the vesicles are effectively accumulated into tumor tissues via the EPR effect. The unsymmetric vesicle containing ICG at the inward surface induces less IgM production than that with ICG at the outward surface. More stealth vesicles in the blood stream are therefore obtainable by concealing the imaging fluorophores in the vesicle.
机译:具有非对称膜的球形囊泡组件由疏水性B和B'嵌段的不同螺旋感测的(3)B型和AB'型肽制备在三种相关因子的控制下:立体复合物形成,偶极 - 偶极物相互作用和空间效应。 [(SAR)(26)](3)-B-(L-Leu-AIB)(6)(A(3)BL),(SAR)(27)-B-(L-Leu-AIB)(6 )(ABL),(SAR)(28)-B-(D-Leu-AIB)(6)(ABD),脂质酸终止ABL(Lipoabl),并在保持的同时混合脂肪酸终止ABD(LipoABD)右手和左手和左手螺旋总量的等摩尔比率。当(3)BL超过混合物的所有右螺旋的超过60%时,形成非对称囊泡,如通过TEM观察到的囊泡表面上的金纳米粒子的选择性吸附所示。使用ICGabl和Icgabd使用近红外荧光团,吲哚菁绿(ICG),在ABL和ABD的末端使用Icgabl和Icgabd制备不对称的囊泡。通过在离子中加入溶液中的荧光猝灭来验证不对称的囊泡形成。当将这些囊泡注入携带肿瘤小鼠时,囊泡通过EPR效应有效地积聚到肿瘤组织中。在向内表面处的ICG含有ICG的未对称囊泡比在向外表面处的ICG产生较少的IgM产生。因此,通过隐藏囊泡中的成像荧光团,可以获得血液中的更多隐形囊泡。

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  • 来源
    《RSC Advances》 |2015年第19期|共7页
  • 作者单位

    Kyoto Univ Grad Sch Engn Dept Mat Chem Nishikyo Ku Kyoto 6158510 Japan;

    Shimadzu Co Ltd Technol Res Lab Seika Kyoto 6190237 Japan;

    Kyoto Univ RISH Kyoto 6110011 Japan;

    Kyoto Univ RISH Kyoto 6110011 Japan;

    Kyoto Univ Grad Sch Engn Dept Mat Chem Nishikyo Ku Kyoto 6158510 Japan;

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  • 正文语种 eng
  • 中图分类 化学;
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