Issue 8, 2015

A novel 18F-labelled high affinity agent for PET imaging of the translocator protein

Abstract

The translocator protein (TSPO) is an important target for imaging focal neuroinflammation in diseases such as brain cancer, stroke and neurodegeneration, but current tracers for non-invasive imaging of TSPO have important limitations. We present the synthesis and evaluation of a novel 3-fluoromethylquinoline-2-carboxamide, AB5186, which was prepared in eight steps using a one-pot two component indium(III)-catalysed reaction for the rapid and efficient assembly of the 4-phenylquinoline core. Biological assessment and the implementation of a physicochemical study showed AB5186 to have low nanomolar affinity for TSPO, as well as optimal plasma protein binding and membrane permeability properties. Generation of [18F]-AB5186 through 18F incorporation was achieved in good radiochemical yield and subsequent in vitro and ex vivo autoradiography revealed the ability of this compound to bind with specificity to TSPO in mouse glioblastoma xenografts. Initial positron emission tomography imaging of a glioma bearing mouse and a healthy baboon support the potential for [18F]-AB5186 use as a radiotracer for non-invasive TSPO imaging in vivo.

Graphical abstract: A novel 18F-labelled high affinity agent for PET imaging of the translocator protein

Supplementary files

Article information

Article type
Edge Article
Submitted
06 May 2015
Accepted
25 May 2015
First published
27 May 2015
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY license

Chem. Sci., 2015,6, 4772-4777

Author version available

A novel 18F-labelled high affinity agent for PET imaging of the translocator protein

A. Blair, F. Zmuda, G. Malviya, A. A. S. Tavares, G. D. Tamagnan, A. J. Chalmers, D. Dewar, S. L. Pimlott and A. Sutherland, Chem. Sci., 2015, 6, 4772 DOI: 10.1039/C5SC01647A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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