Revisiting PFA-mediated tissue fixation chemistry: FixEL enables trapping of small molecules in the brain to visualize their distribution changes.

Revisiting PFA-mediated tissue fixation chemistry: FixEL enables trapping of small molecules in the brain to visualize their distribution changes.
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DOI:
10.1016/j.chempr.2022.11.005
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发表时间:
2023-03
期刊:
影响因子:
23.5
通讯作者:
Hamachi I
Hamachi I
中科院分区:
化学1区
文献类型:
--
作者:
Nonaka H;Mino T;Sakamoto S;Oh JH;Watanabe Y;Ishikawa M;Tsushima A;Amaike K;Kiyonaka S;Tamura T;Aricescu AR;Kakegawa W;Miura E;Yuzaki M;Hamachi I

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各种小分子已被用作医学诊断中的组织成像的功能探针和用于疾病治疗的药物。在结构复杂的样品中,小分子的空间分布、靶选择性和扩散/排泄动力学对功能至关重要。然而,用于精确评估大脑中这些参数的稳健方法受到限制。在此,我们报告了一种新的方法,称为“固定驱动的化学交联的外源配体(FixEL)”,它的陷阱和图像外源管理的分子的兴趣(MOI)在复杂的组织。该方法依赖于蛋白质-MOI相互作用和胺系留的MOI与用于灌注固定的多聚甲醛的化学交联。FixEL用于获得小分子分布的图像,其解决了与蛋白质的选择性/非选择性结合、时间依赖性定位变化以及MOI(例如PET示踪剂衍生物或药物样小分子的支架)的扩散/保留动力学。各种小分子用于成像剂和药物。虽然它们的分子特性,如在体内的空间分布的功能是至关重要的,强大的方法来评估他们已经有限。在这里,我们报告了一种新的方法来捕获和可视化外源性管理的分子的利益(MOI)在大脑中。该方法实现了获得小分子的3D分布的图像,其解决了与蛋白质的选择性/非选择性结合、时间依赖性定位变化以及MOI的扩散/保留动力学。
Various small molecules have been used as functional probes for tissue imaging in medical diagnosis and pharmaceutical drugs for disease treatment. The spatial distribution, target selectivity, and diffusion/excretion kinetics of small molecules in structurally complicated specimens are critical for function. However, robust methods for precisely evaluating these parameters in the brain have been limited. Herein, we report a new method termed “fixation-driven chemical cross-linking of exogenous ligands (FixEL),” which traps and images exogenously administered molecules of interest (MOIs) in complex tissues. This method relies on protein-MOI interactions and chemical cross-linking of amine-tethered MOI with paraformaldehyde used for perfusion fixation. FixEL is used to obtain images of the distribution of the small molecules, which addresses selective/nonselective binding to proteins, time-dependent localization changes, and diffusion/retention kinetics of MOIs such as the scaffold of PET tracer derivatives or drug-like small molecules. Various small molecules are used for imaging agents and medicines. Although their molecular properties such as spatial distribution in vivo are critical for the function, robust methods for evaluating them have been limited. Herein, we report a new method to trap and visualize exogenously administered molecules of interest (MOIs) in the brain. This method realizes to obtain images of the 3D distribution of the small molecules, which addresses selective/nonselective binding to proteins, time-dependent localization changes, and diffusion/retention kinetics of MOI.
光学成像。膨胀显微镜。
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