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Development of Fluorescent 4-[4-(3H-Spiro[isobenzofuran-1,4'-piperidin]-1'-yl)butyl]indolyl Derivatives as High-Affinity Probes to Enable the Study of σ Receptors via Fluorescence-Based Techniques.


ABSTRACT: Sigma (σ) receptor subtypes, σ1 and σ2, are targets of wide pharmaceutical interest. The σ2 receptor holds promise for the development of diagnostics and therapeutics against cancer and Alzheimer's disease. Nevertheless, little is known about the mechanisms activated by the σ2 receptor. To contribute to the exploitation of its therapeutic potential, we developed novel specific fluorescent ligands. Indole derivatives bearing the N-butyl-3H-spiro[isobenzofuran-1,4'-piperidine] portion were functionalized with fluorescent tags. Nanomolar-affinity fluorescent σ ligands, spanning from green to red to near-infrared emission, were obtained. Compounds 19 (σ pan affinity) and 292 selective), which displayed the best compromise between pharmacodynamic and photophysical properties, were investigated in flow cytometry, confocal, and live cell microscopy, demonstrating their specificity for the σ2 receptor. To the best of our knowledge, these are the first red-emitting fluorescent σ2 ligands, validated as powerful tools for the study of σ2 receptors via fluorescence-based techniques.

SUBMITTER: Abatematteo FS 

PROVIDER: S-EPMC10041534 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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Development of Fluorescent 4-[4-(3<i>H</i>-Spiro[isobenzofuran-1,4'-piperidin]-1'-yl)butyl]indolyl Derivatives as High-Affinity Probes to Enable the Study of σ Receptors via Fluorescence-Based Techniques.

Abatematteo Francesca Serena FS   Majellaro Maria M   Montsch Bianca B   Prieto-Díaz Rubén R   Niso Mauro M   Contino Marialessandra M   Stefanachi Angela A   Riganti Chiara C   Mangiatordi Giuseppe Felice GF   Delre Pietro P   Heffeter Petra P   Sotelo Eddy E   Abate Carmen C  

Journal of medicinal chemistry 20230315 6


Sigma (σ) receptor subtypes, σ<sub>1</sub> and σ<sub>2</sub>, are targets of wide pharmaceutical interest. The σ<sub>2</sub> receptor holds promise for the development of diagnostics and therapeutics against cancer and Alzheimer's disease. Nevertheless, little is known about the mechanisms activated by the σ<sub>2</sub> receptor. To contribute to the exploitation of its therapeutic potential, we developed novel specific fluorescent ligands. Indole derivatives bearing the <i>N-</i>butyl-3<i>H</i>  ...[more]

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