Comparison of bifunctional chelates for (64)Cu antibody imaging.

Abstract:

PURPOSE:Improved bifunctional chelates (BFCs) are needed to facilitate efficient (64)Cu radiolabeling of monoclonal antibodies (mAbs) under mild conditions and to yield stable, target-specific agents. The utility of two novel BFCs, 1-Oxa-4,7,10-triazacyclododecane-5-S-(4-isothiocyanatobenzyl)-4,7,10-triacetic acid (p-SCN-Bn-Oxo-DO3A) and 3,6,9,15-tetraazabicyclo[9.3.1]pentadeca-1(15),11,13-triene-4-S-(4-isothiocyanatobenzyl)-3,6,9-triacetic acid (p-SCN-Bn-PCTA), for mAb imaging with (64)Cu were compared to the commonly used S-2-(4-isothiocyanatobenzyl)-1,4,7,10-tetraazacyclododecane-tetraacetic acid (p-SCN-Bn-DOTA). METHODS:The BFCs were conjugated to trastuzumab, which targets the HER2/neu receptor. (64)Cu radiolabeling of the conjugates was optimized. Receptor binding was analyzed using flow cytometry and radioassays. Finally, PET imaging and biodistribution studies were done in mice bearing either HER2/neu-positive or HER2/neu-negative tumors. RESULTS:(64)Cu-Oxo-DO3A- and PCTA-trastuzumab were prepared at room temperature in >95% radiochemical yield (RCY) in <30 min, compared to only 88% RCY after 2 h for the preparation of (64)Cu-DOTA-trastuzumab under the same conditions. Cell studies confirmed that the immunoreactivity of the mAb was retained for each of the bioconjugates. In vivo studies showed that (64)Cu-Oxo-DO3A- and PCTA-trastuzumab had higher uptake than the (64)Cu-DOTA-trastuzumab at 24 h in HER2/neu-positive tumors, resulting in higher tumor to background ratios and better tumor images. By 40 h all three of the (64)Cu-BFC-trastuzumab conjugates allowed for clear visualization of the HER2/neu-positive tumors but not the negative control tumor. CONCLUSION:The antibody conjugates of PCTA and Oxo-DO3A were shown to have superior (64)Cu radiolabeling efficiency and stability compared to the analogous DOTA conjugate. In addition, (64)Cu-PCTA and Oxo-DO3A antibody conjugates may facilitate earlier imaging with greater target to background ratios than the analogous (64)Cu-DOTA antibody conjugates.

authors

Ferreira CL,Yapp DT,Crisp S,Sutherland BW,Ng SS,Gleave M,Bensimon C,Jurek P,Kiefer GE

doi

10.1007/s00259-010-1506-1

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

2117-26

issue

11

eissn

1619-7070

issn

1619-7089

journal_volume

37

pub_type

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