Journal
CANCER GENE THERAPY
Volume 20, Issue 2, Pages 94-100Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/cgt.2012.90
Keywords
TGF-beta isotype; shRNA; adenovirus; antitumor; immunosuppression
Categories
Funding
- Industrial Strategic Technology Development program [10035562]
- Ministry of Knowledge Economy (MKE, Korea)
- National Research Foundation of Korea (NRF)
- Ministry of Education. Science and Technology [2012-0002108]
- Brain Korea 21 project for Medical Science, Yonsei University, College of Medicine, Seoul, South Korea
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Tumor cells secrete a variety of cytokines to outgrow and evade host immune surveillance. In this context, transforming growth factor-beta 1 (TGF-beta 1) is an extremely interesting cytokine because it has biphasic effects in cancer cells and normal cells. TGF-beta 1 acts as a growth inhibitor in normal cells, whereas it promotes tumor growth and progression in tumor cells. Overexpression of TGF-beta 1 in tumor cells also provides additional oncogenic activities by circumventing the host immune surveillance. Therefore, this study ultimately aimed to test the hypothesis that suppression of TGF-beta 1 in tumor cells by RNA interference can have antitumorigenic effects. However, we demonstrated here that the interrelation between TGF-beta isotypes should be carefully considered for the antitumor effect in addition to the selection of target sequences with highest efficacy. The target sequences were proven to be highly specific and effective for suppressing both TGF-beta 1 mRNA and protein expression in cells after infection with an adenovirus expressing TGF-beta 1 short hairpin RNA (shRNA). A single base pair change in the shRNA sequence completely abrogated the suppressive effect on TGF-beta 1. Surprisingly, the suppression of TGF-beta 1 induced TGF-beta 3 upregulation, and the suppression of TGF-beta 2 induced another unexpected downregulation of both TGF-beta 1 and TGF-beta 3. Taken together, this information may prove useful when considering the design for a novel cancer immunogene therapy. Cancer Gene Therapy (2013) 20, 94-100; doi:10.1038/cgt.2012.90; published online 11 January 2013
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