Mesenchymal stem cell targeting of microscopic tumors and tumor stroma development monitored by noninvasive in vivo positron emission tomography imaging

Shih Chieh Hung, Win Ping Deng, Wen K. Yang, Ren Shyan Liu, Chien Chih Lee, Tzu Chi Su, Rue Jen Lin, Den Mei Yang, Chi Wei Chang, Wei Hong Chen, Hon Jian Wei, Juri G. Gelovani

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Abstract

The aim of this study was to assess the efficacy human mesenchymal stem cells (hMSC) for targeting microscopic tumors and suicide gene or cytokine gene therapy. Immunodeficient mice were transplanted s.c. with human colon cancer cells of HT-29 Inv2 or CCS line, and 3 to 4 days later, i.v. with "tracer" h MSCs expressing herpes simplex virus type 1 thymidine kinase (HSV1-TK) and enhanced green fluorescent protein (EGFP) reporter genes. Subsequently, these tumors were examined for specificity and magnitude of HSV1-TK+, EGFP+ stem cell engraftment and proliferation in tumor stroma by in vivo positron emission tomography (PET) with 18F-labeled 9-(4-fluoro-3-hydroxymethylbutyl)-guanine ([ 18F]-FHBG). In vivo PET images of tumors growing for 4 weeks showed the presence of HSV1-TK+ tumor stroma with an average of 0.36 ± 0.24% ID/g [18F]-FHBG accumulation. In vivo imaging results were validated by in situ correlative histochemical, immunofluorescent, and cytometric analyses, which revealed EGFP expression in vWF+ and CD31+ endothelial cells of capillaries and larger blood vessels, in germinal layer of dermis and hair follicles proximal to the s.c. tumor site. These differentiated HSV1-TK+, GFP+ endothelial cells had limited proliferative capacity and a short life span of

Original languageEnglish
Pages (from-to)7749-7756
Number of pages8
JournalClinical Cancer Research
Volume11
Issue number21
DOIs
Publication statusPublished - Nov 1 2005

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ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Hung, S. C., Deng, W. P., Yang, W. K., Liu, R. S., Lee, C. C., Su, T. C., Lin, R. J., Yang, D. M., Chang, C. W., Chen, W. H., Wei, H. J., & Gelovani, J. G. (2005). Mesenchymal stem cell targeting of microscopic tumors and tumor stroma development monitored by noninvasive in vivo positron emission tomography imaging. Clinical Cancer Research, 11(21), 7749-7756. https://doi.org/10.1158/1078-0432.CCR-05-0876