[en] To develop efficient and safe gene therapy approaches, the herpes simplex virus type 1 thymidine kinase gene (HSV-1-tk) has been shown to function as a marker gene for the direct noninvasive in vivo localization of thymidine kinase (TK) expression by positron emission tomography (PET) using radiolabeled nucleoside analogues as specific TK substrates. Moreover, the gene encoding dopamine type 2 receptor (d2r) could be used as a PET marker gene using specific radiolabeled receptor binding compounds. Here we describe the quantitative colocalization of d2r and HSV-1-tk gene expression mediated from a universal HSV-1 amplicon vector in a subcutaneous human Gli36dEGFR glioma model by PET. The HSV-1 amplicon vector was constructed using a bicistronic gene cassette to contain (1) the d2r80A mutant, which is able to bind its ligand racloprid but unable to activate downstream signal transduction pathways, and (2) the tk39 mutant with enhanced enzymatic activity toward guanosine analogues fused to the green fluorescent protein gene (tk39gfp) serving as a marker gene in cell culture. After infection of human Gli36dEGFR glioma cells with the HSV-d2r80AIREStk39gfp (HSV-DITG) amplicon vector in cell culture, D2 receptor expression and its targeting to the cell surface were determined by Western blotting and immunolabeling. Vector application in vivo served for quantitative colocalization of d2r80A- and tk39gfp-derived PET signals employing the specific D2 receptor binding compound [(11)C]racloprid and the specific TK39 substrate 9-(4-[(18)F]fluoro-3-hydroxymethylbutyl)guanine. Our results demonstrate that for the range of gene expression studied in vivo, both enzymatic and receptor binding assays give comparable quantitative information on the level of vector-mediated gene expression in vivo. The d2r80A in combination with a specific binding compound passing the intact blood-brain barrier might be an alternative marker gene for the noninvasive assessment of vector-mediated gene expression in the brain using PET.
Disciplines :
Neurology
Author, co-author :
Kummer, Christiane; Laboratory for Gene Therapy and Molecualr Imaging, Max Planck-Institute for Neurological Research, Center for Molecualr Medicine, and Department of Neurology, University of Cologne, Cologne, Germany
Winkeler, Alexandra; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Dittmar, Claus; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Bauer, Bernd; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Rueger, Maria Adele; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Rueckriem, Benedikt; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
HENEKA, Michael ; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Vollmar, Stefan; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Wienhard, Klaus; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Fraefel, Cornel; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Heiss, Wolf-Dieter; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany
Jacobs, Andreas H; Department of Neurology, Max Planck-Institute for Neurological Research, University of Cologne, Cologne, Germany ; Department of Neurology, MPI for Neurological Research, University of Cologne, 50931 Cologne, Germany
External co-authors :
yes
Language :
English
Title :
Multitracer positron emission tomographic imaging of exogenous gene expression mediated by a universal herpes simplex virus 1 amplicon vector.
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