Journal
CANCER LETTERS
Volume 291, Issue 1, Pages 83-89Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2009.10.002
Keywords
Combination gene therapy; HSV1-tk; shRNA; MDR1; I-131-FIAU imaging
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Funding
- Ministry of Education, Science Technology [20090078234]
- Ministry of Education, Science and Technology, Republic of Korea
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The use of a novel therapeutic vector containing HSV1-thymidine kinase (HSV1-tk) and a short hairpin RNA for the MDR1 gene (shMDR) was proposed previously. We investigated the antitumor effects in an in vivo mouse model of colon cancer and assessed treatment response by serial non-invasive imaging. shMDR-TK expressing (MTKG) tumors for the dual therapy group mice with ganciclovir and doxorubicin showed a decrease in size, while tumors in the single therapy group mice showed a moderate increase (p < 0.05). The I-131-5-iodo-2'-fluoro-2'deoxy-1-beta-D-arabinofuranosyluracil (FIAU) uptake ratio of MTKG-to-parent HCT-15 tumors decreased as treatment progressed for single or dual therapy group mice, while that of the control group mice increased gradually. This study demonstrates the enhanced antitumor effects with combination gene therapy compared with a single therapeutic approach, and provides the potential of therapeutic response monitoring. (C) 2009 Elsevier Ireland Ltd. All rights reserved.
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