Design, radiosynthesis, and evaluation of radiotracers for positron emission tomography imaging of stearoyl-CoA desaturase-1

Design, radiosynthesis, and biological evaluation of two radiotracers (N-(3-[18F]fluoropropyl)-6-(4-(trifluoromethyl)benzoyl)-piperazin-1-yl)pyridazine-3-carboxamide (18F-FPPPT) and (N-(4-[18F]fluoroaniline)-6-(4-(trifluoromethyl)benzoyl)-piperazin-1-yl)pyridazine-3-carboxamide (18F-FAPPT)) are described for noninvasive assessment of stearoyl-CoA desaturase-1 (SCD-1). The overexpression of SCD-1 in multiple solid tumors associates with poor survival in cancer patients. The two radiotracers, 18F-FPPPT and 18F-FAPPT, were each prepared in three steps in radiochemical yields of 21% and 3%, respectively. The practicality of imaging SCD-1 with 18F-FPPPT was tested in two mouse models bearing xenograft tumors with different levels of SCD-1 expression, which afforded a 1.8-fold uptake difference correspondingly. Our work indicates that it is possible to develop SCD-1 specific imaging probes from previously reported SCD-1 inhibitors.

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