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Surgery with molecular fluorescence imaging using activatable cell-penetrating peptides decreases residual cancer and improves survival.

Authors
  • Nguyen, Quyen T1
  • Olson, Emilia S
  • Aguilera, Todd A
  • Jiang, Tao
  • Scadeng, Miriam
  • Ellies, Lesley G
  • Tsien, Roger Y
  • 1 Department of Surgery, Howard Hughes Medical Institute, University of California at San Diego, La Jolla, CA 92093-0647, USA.
Type
Published Article
Journal
Proceedings of the National Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences
Publication Date
Mar 02, 2010
Volume
107
Issue
9
Pages
4317–4322
Identifiers
DOI: 10.1073/pnas.0910261107
PMID: 20160097
Source
Medline
Language
English
License
Unknown

Abstract

The completeness of tumor removal during surgery is dependent on the surgeon's ability to differentiate tumor from normal tissue using subjective criteria that are not easily quantifiable. A way to objectively assess tumor margins during surgery in patients would be of great value. We have developed a method to visualize tumors during surgery using activatable cell-penetrating peptides (ACPPs), in which the fluorescently labeled, polycationic cell-penetrating peptide (CPP) is coupled via a cleavable linker to a neutralizing peptide. Upon exposure to proteases characteristic of tumor tissue, the linker is cleaved, dissociating the inhibitory peptide and allowing the CPP to bind to and enter tumor cells. In mice, xenografts stably transfected with green fluorescent protein show colocalization with the Cy5-labeled ACPPs. In the same mouse models, Cy5-labeled free ACPPs and ACPPs conjugated to dendrimers (ACPPDs) delineate the margin between tumor and adjacent tissue, resulting in improved precision of tumor resection. Surgery guided by ACPPD resulted in fewer residual cancer cells left in the animal after surgery as measured by Alu PCR. A single injection of ACPPD dually labeled with Cy5 and gadolinium chelates enabled preoperative whole-body tumor detection by MRI, intraoperative guidance by real-time fluorescence, intraoperative histological analysis of margin status by fluorescence, and postoperative MRI tumor quantification. Animals whose tumors were resected with ACPPD guidance had better long-term tumor-free survival and overall survival than animals whose tumors were resected with traditional bright-field illumination only.

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