Abstract:
:The quinazoline class was exploited to search for a new translocator protein (TSPO) fluorescent probe endowed with improved affinity and residence time (RT). Computational studies on an "in-house" collection of quinazoline derivatives, featuring highly steric demanding groups at the amide nitrogen, suggested that, despite their molecular extension, these ligands are still easily lodged in the TSPO binding site. Binding assays supported this hypothesis, highlighting a low nanomolar/subnanomolar affinity of these ligands, together with a higher RT of the representative compound 11 with respect to our previously reported indole-based fluorescent probe. Thanks to the amenability of the amide nitrogen atom to be substituted with bulky groups, we developed quinazoline-based imaging tools by fluorescently labeling the scaffold at this position. Probes with relevant TSPO affinity, favorable spectroscopic properties, and improved RT were identified. The results from fluorescence microscopy showed that these probes specifically labeled the TSPO at the mitochondrial level in the U343 cell line.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Milite C,Barresi E,Da Pozzo E,Costa B,Viviano M,Porta A,Messere A,Sbardella G,Da Settimo F,Novellino E,Cosconati S,Castellano S,Taliani S,Martini Cdoi
10.1021/acs.jmedchem.7b01031subject
Has Abstractpub_date
2017-09-28 00:00:00pages
7897-7909issue
18eissn
0022-2623issn
1520-4804journal_volume
60pub_type
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