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Molecular Imaging and Biology

, Volume 14, Issue 3, pp 336–347 | Cite as

An Engineered Cysteine-Modified Diabody for Imaging Activated Leukocyte Cell Adhesion Molecule (ALCAM)-Positive Tumors

  • Katelyn E. McCabe
  • Bin Liu
  • James D. Marks
  • James S. Tomlinson
  • Hong Wu
  • Anna M. Wu
Research Article

Abstract

Purpose

The purpose of this study was to generate and evaluate a positron emission tomography (PET) radiotracer targeting activated leukocyte cell adhesion molecule (ALCAM).

Procedures

A human anti-ALCAM single chain variable fragment was reformatted to produce a covalent dimer, termed a cys-diabody (CysDb). Purified CysDb was characterized by gel electrophoresis and size exclusion chromatography, and immunoreactivity was assessed by flow cytometry and immunofluorescence. Targeting and imaging of ALCAM-positive tumors using 64Cu-DOTA-CysDb were evaluated in mice bearing human pancreatic adenocarcinoma xenografts (HPAF-II or BxPC-3).

Results

CysDb binds specifically to ALCAM-positive cells in vitro with an apparent affinity in the range of 1–3 nM. MicroPET images at 4 h showed specific targeting of positive tumors in vivo, a finding confirmed by biodistribution analysis, with positive/negative tumor ratios of 1.9 ± 0.6 and 2.4 ± 0.6, and positive tumor/blood ratios of 2.5 ± 0.9 and 2.9 ± 0.6 (HPAF-II and BxPC-3, respectively).

Conclusions

Successful imaging with 64Cu-DOTA-CysDb in animal models suggests further investigation of ALCAM as an imaging biomarker is warranted.

Key words

Activated leukocyte cell adhesion molecule (ALCAM) Biomarker Diabody Pancreatic cancer Positron emission tomography (PET) 

Notes

Acknowledgements

Funding support was provided by the National Cancer Institute through the UCLA in vivo Cellular and Molecular Imaging Center (NIH CA 86306), the Stanford Center for Nanotechnology Excellence (NIH CA 119367), and the UCLA Small Animal Imaging Resource Program (NIH CA 92865), and a Dr. Ursula Mandel Scholarship. We thank Dr. Noah Federman for his help with the immunofluorescence experiments and Waldemar Ladno for his assistance with the animal studies. We would also like to acknowledge the UCLA Translational Pathology Core Laboratory for their antibody optimization and immunostaining services. Flow cytometry was performed in the UCLA Jonsson Comprehensive Cancer Center (JCCC) and Center for AIDS Research Flow Cytometry Core Facility, supported by NIH awards CA-16042 and AI-28697.

Conflict of Interest

Anna M. Wu owns stock and is a consultant to ImaginAb, Inc. James D. Marks own stock, is a member of the Scientific Advisory Board, and is a consultant to ImaginAb, Inc. The other authors declare they have no conflicts of interest.

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Copyright information

© Academy of Molecular Imaging and Society for Molecular Imaging 2011

Authors and Affiliations

  1. 1.Crump Institute for Molecular Imaging, Department of Molecular and Medical PharmacologyDavid Geffen School of Medicine at University of California, Los AngelesLos AngelesUSA
  2. 2.Department of AnesthesiaUniversity of California, San FranciscoSan FranciscoUSA
  3. 3.Department of Pharmaceutical ChemistryUniversity of California, San FranciscoSan FranciscoUSA
  4. 4.Division of Surgical OncologyDavid Geffen School of Medicine at University of California, Los AngelesLos AngelesUSA
  5. 5.Department of Molecular and Medical PharmacologyDavid Geffen School of Medicine at University of California, Los AngelesLos AngelesUSA

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