Comparison of [
<sup>18</sup>
F]F‐CNBI and [
<sup>18</sup>
F]F‐CNPIFE as Positron Emission Tomography Probes for Noninvasive Imaging of Glycogen Synthase Kinase‐3 in Normal Mice
作者:Heather M. Stein、Surendra R. Gundam、Aditya Bansal、Nicholas R. Nelson、Geoffry L. Curran、Timothy R. DeGrado、Mark A. Frye、John D. Port、Val J. Lowe、Melissa E. Murray、Mukesh K. Pandey
DOI:10.1002/ejoc.202201031
日期:2023.1.17
AbstractGlycogen synthase kinase‐3 α/β is involved in dysregulation of neuronal tau protein in Alzheimer's disease (AD). There is an unmet clinical need for a blood‐brain barrier (BBB) permeable positron emission tomography (PET) probe for imaging of GSK‐3α/β in the brain to understand the pathogenesis of AD. Herein, we synthesized two PET probes, [18F]F‐CNBI and [18F]F‐CNPIFE, and evaluated their BBB permeability and affinity towards GSK‐3α/β. [19F]F‐CNPIFE showed higher in‐vitro binding towards GSK‐3α/β (IC50=19.4±2.5 nM; n=3, for GSK‐3α, IC50=19.4±3.8 nM; n=3, for GSK‐3β) compared to [19F]F‐CNBI (IC50=107.6±26.0 nM; n=4, for GSK‐3α, IC50=105.3±18.2 nM; n=3, for GSK‐3β). [18F]F‐CNPIFE showed 9.5‐fold higher brain uptake than [18F]F‐CNBI, in normal FVB/NJ mice, which was increased by additional 1.5‐fold on co‐administration of [19F]F‐CNPIFE with respect to [18F]F‐CNBI. Overall, [18F]F‐CNPIFE is a promising PET probe for GSK‐3α/β imaging and warrants further evaluation in an AD mouse model.