Plasmid-based Stat3-specific siRNA and GRIM-19 inhibit the growth of thyroid cancer cells in vitro and in vivo

Wang,Gui-Min; Ren,Zhong-Xi; Wang,Pei-Song; Su,Chang; Zhang,Wen-Xin; Liu,Zeng-Guang; Zhang,Ling; Zhao,Xue-Jian; Chen,Guang

doi:10.3892/or.2014.3233

Plasmid-based Stat3-specific siRNA and GRIM-19 inhibit the growth of thyroid cancer cells in vitro and in vivo

Authors:
- Gui-Min Wang
- Zhong-Xi Ren
- Pei-Song Wang
- Chang Su
- Wen-Xin Zhang
- Zeng-Guang Liu
- Ling Zhang
- Xue-Jian Zhao
- Guang Chen
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Affiliations: Department of Thyroid Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China, Department of Pathophysiology, College of Basic Medical Sciences of Jilin University, Changchun, Jilin 130021, P.R. China, Department of General Surgery, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
Published online on: June 5, 2014 https://doi.org/10.3892/or.2014.3233
Pages: 573-580

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Abstract

It has been shown that overexpression of signal transducer and activator of transcription 3 (Stat3) contribute to the progression and metastasis of various solid tumors and that silencing Stat3 inhibits tumor growth in several types of cancer. Gene associated with retinoid-IFN-induced mortality 19 (GRIM-19), a Stat3-inhibitory protein, was identified as a potential tumor suppressor associated with growth inhibition and cell apoptosis by targeting the transcription factor Stat3 for inhibition. However, little is known about Stat3 and GRIM-19 roles in the tumor growth of thyroid carcinoma cells. In the present study, we developed a dual expression plasmid that co-expressed Stat3-specific siRNA and GRIM-19 (pSi-Stat3-GRIM-19) and transfected it into SW579 cells (thyroid carcinoma cell line) to evaluate its effects on cell proliferation, cell apoptosis, cell migration and cell invasion in vitro and tumor growth in vivo. Simultaneous expression of pSi-Stat3-GRIM-19 in SW579 cancer cells was found to significantly suppress the proliferation, migration and invasion in vitro and tumor growth in vivo, when compared to the controls either Stat3-specific siRNA or GRIM-19 alone. In conclusion, our data demonstrated that a combined strategy of co-expressed Stat3-specific siRNA and GRIM19 synergistically and more effectively suppressed thyroid tumor growth, and have therapeutic potential for the treatment of thyroid cancer.

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