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Theranostics 2011; 1:381-394. doi:10.7150/thno/v01p0381 This volume Cite

Research Paper

Theranostic cRGD-BioShuttle Constructs Containing Temozolomide- and Cy7 For NIR-Imaging and Therapy

Manfred Wiessler¹, Ute Hennrich¹, Rüdiger Pipkorn², Waldemar Waldeck³, Liji Cao¹, Jörg Peter¹, Volker Ehemann⁴, Wolfhard Semmler¹, Twan Lammers⁵, Klaus Braun^{1 ✉}

1. DKFZ, Dept. of Imaging and Radiooncology, INF 280, D-69120 Heidelberg, Germany
2. DKFZ, Central Peptide Synthesis Unit, INF 580, D-69120 Heidelberg, Germany
3. DKFZ, Div. of Biophysics of Macromolecules, INF 580, D-69120 Heidelberg, Germany
4. University of Heidelberg, Institute of Pathology, INF 220, D-69120 Heidelberg, Germany
5. RWTH Aachen University, Dept. of Experimental Molecular Imaging, Pauwelsstrasse 30, D-52074 Aachen, Germany

✉ Corresponding author: Klaus Braun, Ph.D., German Cancer Research Center (DKFZ), Dept. of Imaging and Radiooncology, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany. Phone: +49 6221-42 2495; Fax: +49 6221-42 3326; e-mail: k.braunde

Abstract

Innovative and personalized therapeutic approaches result from the identification and control of individual aberrantly expressed genes at the transcriptional and post-transcriptional level. Therefore, it is of high interest to establish diagnostic, therapeutic and theranostic strategies at these levels. In the present study, we used the Diels-Alder Reaction with inverse electron demand (DAR_inv) click chemistry to prepare a series of cyclic RGD-BioShuttle constructs. These constructs carry the near-infrared (NIR) imaging agent Cy7 and the chemotherapeutic agent temozolomide (TMZ). We evaluated their uptake by and their efficacy against integrin α_vβ₃-expressing MCF7 human breast carcinoma cells. In addition, using a mouse phantom, we analyzed the suitability of this targeted theranostic agent for NIR optical imaging. We observed that the cyclic RGD-based carriers containing TMZ and/or Cy7 were effectively taken up by α_vβ₃-expressing cells, that they were more effective than free TMZ in inducing cell death, and that they could be quantitatively visualized using NIR fluorescence imaging. Therefore, these targeted theranostic agents are considered to be highly suitable systems for improving disease diagnosis and therapy.

Keywords: BioShuttle, Click-Chemistry, inverse Diels Alder Reaction, Ligation chemistry, NIR Imaging, RGD, targeted Imaging, targeted Therapy, Temozolomide, Theranostics

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