Imperial College London

ProfessorEricAboagye

Faculty of MedicineDepartment of Surgery & Cancer

Professor
 
 
 
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Contact

 

+44 (0)20 3313 3759eric.aboagye

 
 
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Assistant

 

Mrs Maureen Francis +44 (0)20 7594 2793

 
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Location

 

GN1Commonwealth BuildingHammersmith Campus

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Summary

 

Publications

Citation

BibTex format

@article{George:2013:10.1002/jlcr.3095,
author = {George, GPC and Pisaneschi, F and Stevens, E and Nguyen, QD and Åberg, O and Spivey, AC},
doi = {10.1002/jlcr.3095},
journal = {J. Label Compd. Radiopharm.},
title = {Scavenging strategy for specific activity improvement: application to a new CXCR4-specific cyclopentapeptide positron emission tomography tracer},
url = {http://dx.doi.org/10.1002/jlcr.3095},
year = {2013}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Huisgen cycloaddition is attractive to label peptide because of its rapidity and bioorthogonality. However, for larger tracers, the physico-chemical differences between the precursor and the tracer are usually insufficient to allow their separation by HPLC, reducing the specific activity. This is of importance for peptidic tracers because the combination of their high-affinity receptor with low specific activity results in the precursor saturating the receptors, causing non-specific tracer binding. Here, we report a fast, one-pot, general strategy to circumvent this issue, yielding a tracer of improved specific activity. It consists in adding a lipophilic azide after the labeling step to scavenge unreacted precursor into a more lipophilic species that does not co-elute with the tracer. We applied this strategy to a new fluorinated cyclopentapeptidic CXCR4 antagonist for the PET imaging of cancer, CCIC15, for which we managed to reduce the apparent peptide concentration by a factor of 34 in 10 min. This tracer was radiolabeled by click chemistry with 2-[18F]fluoroethylazide, yielding the tracer in 18 ±6% (n = 5) end-of-synthesis radiochemical yields (EOS-RCY) in 1.5 h from [18F]fluoride with a specific activity of 19.4 GBq μmol 1. Preliminary biological evaluation of the probe confirmed potency and specificity for CXCR4; further biological evaluation is underway.
AU - George,GPC
AU - Pisaneschi,F
AU - Stevens,E
AU - Nguyen,QD
AU - Åberg,O
AU - Spivey,AC
DO - 10.1002/jlcr.3095
PY - 2013///
TI - Scavenging strategy for specific activity improvement: application to a new CXCR4-specific cyclopentapeptide positron emission tomography tracer
T2 - J. Label Compd. Radiopharm.
UR - http://dx.doi.org/10.1002/jlcr.3095
ER -