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MANOTA: a promising bifunctional chelating agent for copper-64 immunoPET

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Abstract

Improved bifunctional chelating agents (BFC) are required for copper-64 radiolabelling of monoclonal antibodies (mAbs) under mild conditions to yield stable, target-specific imaging agents. Four different bifunctional chelating agents (BFC) were evaluated for Fab (Fragment antigen binding) conjugation and radiolabelling with copper-64. Two DOTA- (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) and two NOTA- (1,4,7-triazacyclononane-1,4,7-triacetic acid) derivatives bearing a p-benzyl-isothiocyanate group were conjugated to Fab-trastuzumab – which targets the HER2/neu receptor – and the average number of chelators attached ranged from 2.4 to 4.3 macrocycles per Fab. Labelling of the immunoconjugate with copper-64 was achieved in high radiochemical yields after 45 min at 37 °C, and the radiochemical purity of each 64Cu-BFC-Fab-trastuzumab reached 97% after purification. The affinity of each 64Cu-BFC-Fab-trastuzumab ranged between 10 and 50 nM as evaluated by in vitro saturation assays using the HCC1954 breast cancer cell line. PET-MR imaging and biodistribution studies were performed in mice bearing breast cancer BT-474 xenografts. BT-474 tumours were clearly visualized on PET images at 4 and 24 hours post-injection. The tumour uptake of 64Cu-BFC-Fab-trastuzumab reached 8.9 to 12.8% ID g−1 24 hours post-injection and significant differences in non-specific liver uptake were observed depending on the BFC conjugated, the lowest being observed with MANOTA. These results show that MANOTA is a valuable tool for copper-64 radiolabelling.

Graphical abstract: MANOTA: a promising bifunctional chelating agent for copper-64 immunoPET

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Publication details

The article was received on 15 May 2017, accepted on 17 Aug 2017 and first published on 17 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT01772C
Citation: Dalton Trans., 2017, Advance Article
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    MANOTA: a promising bifunctional chelating agent for copper-64 immunoPET

    M. Moreau, S. Poty, J.-M. Vrigneaud, P. Walker, M. Guillemin, O. Raguin, A. Oudot, C. Bernhard, C. Goze, F. Boschetti, B. Collin, F. Brunotte and F. Denat, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT01772C

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