Ontology type: schema:ScholarlyArticle Open Access: True
2008-07-03
AUTHORSC Ren, S Kumar, D Chanda, L Kallman, J Chen, J D Mountz, S Ponnazhagan
ABSTRACTCell-based therapy for cancer is a promising new field. Among cell types that can be used for this purpose, mesenchymal stem cells (MSCs) appear to hold great advantage for reasons including easier propagation in culture, possible genetic modification to express therapeutic proteins and preferential homing to sites of cancer growth upon in vivo transfer. The present study evaluated the potential of genetically modified MSC, constitutively expressing interferon (IFN)-β, in an immunocompetent mouse model of prostate cancer lung metastasis. A recombinant adeno-associated virus (rAAV) encoding mouse IFN-β was constructed and initially tested in vitro for high-level expression and bioactivity of the transgenic protein. MSCs were transduced by the rAAV-IFN-β or green fluorescent protein ex vivo and used as cellular vehicles to target lung metastasis of TRAMP-C2 prostate cancer cells in a therapy model. Cohorts of mice were killed on days 30 and 75 to determine the effect of therapy by measurement of tumor volume, histology, immunohistochemistry, enzyme-linked immunosorbent assay and flow cytometry. Results indicated a significant reduction in tumor volume in lungs following IFN-β-expressing MSC therapy. Immunohistochemistry of the lung demonstrated increased tumor cell apoptosis and decreased tumor cell proliferation and blood vessel counts. A significant increase in the natural kill cell activity was observed following IFN-β therapy correlating the antitumor effect. Systemic level of IFN-β was not significantly elevated from this targeted cell therapy. These data demonstrate the potential of MSC-based IFN-β therapy for prostate cancer lung metastasis. More... »
PAGES1446-1453
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DOIhttp://dx.doi.org/10.1038/gt.2008.101
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