Comparative evaluation of tumor targeting using the anti-HER2 ADAPT scaffold protein labeled at the C-terminus with indium-111 or technetium-99m.

Garousi J, Lindbo S, Mitran B, Buijs J, Vorobyeva A, Orlova A, Tolmachev V, Hober S

Sci Rep 7 (1) 14780 [2017-11-07; online 2017-11-07]

ABD-Derived Affinity Proteins (ADAPTs) is a novel class of engineered scaffold proteins derived from an albumin-binding domain of protein G. The use of ADAPT6 derivatives as targeting moiety have provided excellent preclinical radionuclide imaging of human epidermal growth factor 2 (HER2) tumor xenografts. Previous studies have demonstrated that selection of nuclide and chelator for its conjugation has an appreciable effect on imaging properties of scaffold proteins. In this study we performed a comparative evaluation of the anti-HER2 ADAPT having an aspartate-glutamate-alanine-valine-aspartate-alanine-asparagine-serine (DEAVDANS) N-terminal sequence and labeled at C-terminus with 99mTc using a cysteine-containing peptide based chelator, glycine-serine-serine-cysteine (GSSC), and a similar variant labeled with 111In using a maleimido derivative of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) chelator. Both 99mTc-DEAVDANS-ADAPT6-GSSC and 111In-DEAVDANS-ADAPT6-GSSC-DOTA accumulated specifically in HER2-expressing SKOV3 xenografts. The tumor uptake of both variants did not differ significantly and average values were in the range of 19-21%ID/g. However, there was an appreciable variation in uptake of conjugates in normal tissues that resulted in a notable difference in the tumor-to-organ ratios. The 111In-DOTA label provided 2-6 fold higher tumor-to-organ ratios than 99mTc-GSSC and is therefore the preferable label for ADAPTs.

PubMed 29116215

DOI 10.1038/s41598-017-15366-w

Crossref 10.1038/s41598-017-15366-w

pmc: PMC5676751
pii: 10.1038/s41598-017-15366-w