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Radiometal-Labeled Peptide−PNA Conjugates for Targeting bcl-2 Expression:  Preparation, Characterization, and in Vitro mRNA Binding

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Department of Veterinary Medicine and Surgery, Department of Radiology, Department of Chemistry, University of Missouri Research Reactor, and Department of Biochemistry, University of MissouriColumbia, Columbia, Missouri 65211
Cite this: Bioconjugate Chem. 2002, 13, 6, 1176–1180
Publication Date (Web):November 5, 2002
https://doi.org/10.1021/bc025591s
Copyright © 2002 American Chemical Society
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    Abstract

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    A new antisense peptide−peptide nucleic acid (peptide−PNA) conjugate, designed for targeting bcl-2 expression, has been radiolabeled, characterized, and evaluated for bcl-2 mRNA binding in a cell-free system. A PNA complementary to the first six codons of the bcl-2 gene was synthesized by standard solid-phase Fmoc chemistry and conjugated to a new derivative of 1,4,7,10-tetraazacyclododecane-N,N‘,N‘ ‘,N‘ ‘‘-tetraacetic acid (DOTA) that allows macrocyclic radiometal chelates to be incorporated into any sequence position of a peptide−PNA conjugate. The DOTA−PNA conjugate was then coupled to a membrane-permeating transduction peptide, PTD-4, designed for intracellular delivery of the radiolabeled PNA. The conjugate was characterized by HPLC and ESI-MS and labeled with 111In and 90Y to high specific activities (>1000 Ci/mmol) with high radiochemical purity. Northern blot analysis showed that 90Y-PTD-4−K(DOTA)−anti-bcl-2-PNA bound specifically to as little as 50 fmol of bcl-2 mRNA, a result equivalent to that obtained with the analogous 32P-labeled DNA antisense oligonucleotide. Thus, the mRNA targeting properties of 111In- and 90Y-PTD-4−K(DOTA)−anti-bcl-2-PNA demonstrate potential for diagnostic imaging and targeted radiotherapy applications in bcl-2-positive cancers.

    *

     To whom correspondence should be addressed:  Michael R. Lewis, Ph.D., Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, 379 E. Campus Drive, University of Missouri-Columbia, Columbia, MO 65211. Phone:  (573) 814-6000, ext. 3703. FAX:  (573) 814−6551. E-mail:  LewisMic@ missouri.edu.

    †

     Department of Veterinary Medicine and Surgery.

    ‡

     Department of Radiology.

    §

     Department of Chemistry.

    #

     University of Missouri Research Reactor.

    ‖

     Department of Biochemistry.

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    Experimental details on purification, radiometal labeling, and analytical characterization of PTD-4-PNA conjugates, subcloning of bcl-2, and mRNA binding assays. This material is available free of charge via the Internet at http://pubs.acs.org.

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