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Dually Labeled Neurotensin NTS1R Ligands for Probing Radiochemical and Fluorescence-Based Binding Assays
Journal of Medicinal Chemistry ( IF 6.8 ) Pub Date : 2024-09-11 , DOI: 10.1021/acs.jmedchem.4c01470
Fabian J Ertl 1 , Sergei Kopanchuk 2 , Nicola C Dijon 3 , Santa Veikšina 2 , Maris-Johanna Tahk 2 , Tõnis Laasfeld 2 , Franziska Schettler 1 , Albert O Gattor 1 , Harald Hübner 4 , Nataliya Archipowa 5 , Johannes Köckenberger 4 , Markus R Heinrich 4 , Peter Gmeiner 4 , Roger J Kutta 6 , Nicholas D Holliday 3 , Ago Rinken 2 , Max Keller 1
Affiliation  

The determination of ligand–receptor binding affinities plays a key role in the development process of pharmaceuticals. While the classical radiochemical binding assay uses radioligands, fluorescence-based binding assays require fluorescent probes. Usually, radio- and fluorescence-labeled ligands are dissimilar in terms of structure and bioactivity, and can be used in either radiochemical or fluorescence-based assays. Aiming for a close comparison of both assay types, we synthesized tritiated fluorescent neurotensin receptor ligands ([3H]13, [3H]18) and their nontritiated analogues (13, 18). The labeled probes were studied in radiochemical and fluorescence-based (high-content imaging, flow cytometry, fluorescence anisotropy) binding assays. Equilibrium saturation binding yielded well-comparable ligand–receptor affinities, indicating that all these setups can be used for the screening of new drugs. In contrast, discrepancies were found in the kinetic behavior of the probes, which can be attributed to technical differences of the methods and require further studies with respect to the elucidation of the underlying mechanisms.

中文翻译:


双标记的神经降压素 NTS1R 配体,用于探测放射化学和基于荧光的结合测定



配体-受体结合亲和力的测定在药物开发过程中起着关键作用。经典的放射化学结合测定使用放射性配体,而基于荧光的结合测定需要荧光探针。通常,放射性和荧光标记的配体在结构和生物活性方面不同,可用于放射化学或基于荧光的测定。为了密切比较两种测定类型,我们合成了氚化荧光神经降压素受体配体 ([3H]13, [3H]18) 及其非氚化类似物 (1318)。在放射化学和基于荧光的 (高内涵成像、流式细胞术、荧光各向异性) 结合测定中研究标记的探针。平衡饱和结合产生了相当的配体-受体亲和力,表明所有这些设置都可用于新药的筛选。相比之下,在探针的动力学行为中发现了差异,这可以归因于方法的技术差异,需要进一步研究以阐明潜在机制。
更新日期:2024-09-11
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