Synthesis, Radiolabeling, and and Characterization of Heterobivalent Peptidic Agents for Bispecific EGFR and Integrin αβ Targeting

Radiolabeled heterobivalent peptidic ligands (HBPLs) are a highly promising compound class for the sensitive and specific visualization of tumors as they often exhibit superior properties compared to their monospecific counterparts and are able to concomitantly or complementarily address different receptor types. The combination of two receptor-specific agents targeting the epidermal growth factor receptor (EGFR) and the integrin αβ in one HBPL would constitute a synergistic combination of binding motifs as these two receptor types are concurrently overexpressed on several human tumor types and are closely associated with disease progression and metastasis. Here, we designed and synthesized two heterobivalent radioligands consisting of the EGFR-specific peptide GE11 and αβ-specific cyclic RGD peptides, bearing a (1,4,7-triazacyclononane-4,7-diyl)diacetic acid-1-glutaric acid chelator for efficient radiolabeling and linkers of different lengths between both peptides. Both HBPLs were radiolabeled with Ga in high radiochemical yields, purities of 96-99%, and molar activities of 36-88 GBq/μmol. [Ga]Ga- and [Ga]Ga- were evaluated for their log and stability toward degradation by human serum peptidases, showing a high hydrophilicity for both agents of -3.07 ± 0.01 and -3.44 ± 0.08 as well as a high stability toward peptidase degradation in human serum with half-lives of 272 and 237 min, respectively. Further on, the receptor binding profiles of both HBPLs to the target EGF and integrin αβ receptors were assessed on EGFR-positive A431 and αβ-positive U87MG cells. Finally, we investigated the pharmacokinetics of HBPL [Ga]Ga- by positron emission tomography/computed tomography imaging in A431 tumor-bearing xenograft mice to assess its potential for the receptor-specific visualization of EGFR- and/or αβ-expressing tumors. In these experiments, [Ga]Ga- demonstrated a tumor uptake of 2.79 ± 1.66% ID/g, being higher than in all other organs and tissues apart from kidneys and blood at 2 h p.i. Receptor blocking studies revealed the observed tumor uptake to be solely mediated by integrin αβ, whereas no contribution of the GE11 peptide sequence to tumor uptake the EGFR could be determined. Thus, the approach to develop radiolabeled EGFR- and integrin αβ-bispecific HBPLs is in general feasible although another peptide lead structure than GE11 should be used as the basis for the EGFR-specific part of the agents.