Abstract
Purpose
The purpose of the study is to synthesize and characterize near-infrared (NIR) fluorescence imaging probes targeted to gelatinases.
Procedures
A phage display-selected cyclic peptide containing the His-Try-Gly-Phe (HWGF) motif was used as the lead compound. Structure–activity relationship analysis was used to identify stable and potent gelatinase inhibitors suitable for NIR imaging applications.
Results
Replacing the S–S bond in cyclic peptide c(CTTHWGFTLC)NH2 (C1) with an amide bond between the ε-amino group of Lys and the side chain of Asp resulted in a significant increase in stability and a fourfold increase in gelatinase inhibition of the resulting peptide, c(KAHWGFTLD)NH2 (C6). Conjugation of Cy5.5 to C6 led to Cy5.5–C6, which was selectively taken up by MMP-2 expressing human glioma U87 cells. In vivo, selective accumulation of Cy5.5–C6, but not Cy5.5–C1 or a Cy5.5-scrambled peptide conjugate, was visualized in intratibial prostate PC-3 tumors 48 h after their intravenous injection. Moreover, Cy5.5–C6 was readily visualized in orthotopically inoculated U87 brain tumors.
Conclusions
Cy5.5–C6 may be a useful agent for molecular imaging of gelatinases. The approach of producing stable cyclic peptides through side chain amide linkage should be applicable to other peptide-based imaging agents.
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Acknowledgement
Supported in part by NCI grants R01 EB000174 and U54 CA90810 and by the John S. Dunn Foundation. MALDI mass spectrometry was done by the Proteomics Core Laboratory in the Department of Molecular Pathology at M. D. Anderson Cancer Center.
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Wang, W., Shao, R., Wu, Q. et al. Targeting Gelatinases with a Near-Infrared Fluorescent Cyclic His-Try-Gly-Phe Peptide. Mol Imaging Biol 11, 424–433 (2009). https://doi.org/10.1007/s11307-009-0219-y
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DOI: https://doi.org/10.1007/s11307-009-0219-y