BIOTINYLATED AND CHELATED POLY-L-LYSINE AS EFFECTOR FOR PRETARGETING IN CANCER THERAPY AND IMAGING
Journal Title: International Journal of Pharmacy and Pharmaceutical Sciences - Year 2017, Vol 9, Issue 1
Abstract
Objective: The aim of this study was to synthesise and evaluate polylysine-based effectors for pretargeted radioimmunotherapy and imaging. These molecules can readily be size-modified and charge-modified to decrease the renal uptake of radioactivity, which is often a major problem for small radiolabeled molecules. Several chelators and biotin molecules (for antibody-streptavidin-binding in vivo) are also easily incorporated into one structure because of the polylysine.Methods: The effectors were synthesised using poly-L-lysine, NHS-LC-biotin, CHX-A’’-DTPA or p-SCN-Bn-DOTA and succinic anhydride. They were characterised, labelled with 213Bi for targeted α therapy, 68Ga for PET and 111In for SPECT, and evaluated in vitro. A kidney uptake study was performed as well with two different-sized 213Bi-labeled effectors, to evaluate how the difference in size affects the renal filtration.Results: Radiochemical purities between 97.4±0.6 % and 99.6±0.1 % and decay-corrected yields of 80.2±2.4 % after purification were achieved with the radiolabeled molecules, as well as a specific activity of 7.6 × 103GBq/µmol. The avidin binding capacity was 94.4±1.9%. The kidney uptake study demonstrated a reduction of renal absorbed dose by 80% when modifying the molecular size and charge.Conclusion: The synthesised polylysine-based effectors show potential for further in vivo evaluation in pretargeted radioimmunotherapy and imaging.
Authors and Affiliations
Anna Gustafsson Lutz, Tom BÄck, Emma Aneheim, Stig Palm, Alfred Morgenstern, Frank Bruchertseifer, Per Albertsson, Sture Lindegren
Keywords
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- EP ID EP575767
- DOI 10.22159/ijpps.2017v9i1.11109
- Views 104
- Downloads 0
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