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Issue 12, 2011
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Molecular imaging of Cathepsin E-positive tumors in mice using a novel protease-activatable fluorescent probe

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Abstract

The purpose of this study is to demonstrate the ability of imaging Cathepsin E (Cath E) positive tumors in living animals through selective targeting of Cath E proteolytic activity using a sensitive molecular imaging agent. Methods: a peptide-based Cath E imaging probe and a control probe were synthesized for this study. Human Cath E-positive cancer cells (MPanc96-E) were implanted subcutaneously in nude mice. Tumor-bearing mice were examined in vivo with near-infrared fluorescence (NIRF) imaging at various time points after intravenous injection of the Cath E sensing imaging probe. Excised organs and tissues of interest were further imaged ex vivo. Results: upon specific Cath E proteolytic activation, the NIRF signal of the imaging probe a was converted from an optically quenched initial state to a highly fluorescent active state. Imaging probe a was able to highlight the Cath E-positive tumors as early as 24 h post injection. Fluorescent signal in tumor was 3-fold higher than background. The confined specificity of imaging probe a to tumor associated Cath E was verified by using control imaging probe b. Both in vivo and ex vivo imaging results confirmed the superior selectivity and sensitivity of imaging probe a in Cath E imaging. Conclusions: the small animal studies demonstrated the capability of probe a for imaging Cath E-positive tumors. The developed optical probe could be applied in early diagnostic imaging and guiding subsequent surgical procedure.

Graphical abstract: Molecular imaging of Cathepsin E-positive tumors in mice using a novel protease-activatable fluorescent probe

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Supplementary files

Article information


Submitted
01 Jun 2011
Accepted
25 Aug 2011
First published
20 Sep 2011

Mol. BioSyst., 2011,7, 3207-3213
Article type
Paper

Molecular imaging of Cathepsin E-positive tumors in mice using a novel protease-activatable fluorescent probe

W. R. Abd-Elgaliel, Z. Cruz-Monserrate, C. D. Logsdon and C. Tung, Mol. BioSyst., 2011, 7, 3207
DOI: 10.1039/C1MB05215B

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