Abstract
Purpose
Krüppel-like factor 8 (KLF8) plays an important role in oncogenic transformation and is highly overexpressed in several types of human cancer. We investigated the expression of KLF8 in renal cell carcinoma (RCC) tissues and the role of small interference RNA targeting KLF8 on growth, cell cycle, and apoptosis of human renal carcinoma cell line 786-0 in vitro and in vivo.
Methods
The expression of KLF8 protein and mRNA in human renal carcinoma samples was detected by immunochemistry and reverse transcription polymerase chain reaction (RT-PCR). The effects of small interference RNA (siRNA) targeting KLF8 on growth, invasiveness, cell cycle, and apoptosis of 786-0 cells were evaluated by MTT assay, Matrigel Invasion Assay, and flow cytometry in vitro. We also investigated effect of siRNA targeting KLF8 on growth of 786-0 cells in nude mice in vivo.
Results
Immunohistochemistry and RT-PCR results showed the expression of KLF8 protein and mRNA in RCC specimens was significantly higher than that in the adjacent non-tumorous renal tissues (P < 0.001). KLF8-siRNA depressed the cellular growth and invasion of 786-0 cells in vitro. The flow cytometry results revealed that KLF8-siRNA could induce an increase in G0/G1 phase cells and induce cell apoptosis. Intratumor injection of siRNA targeting KLF8 inhibited the growth of 786-0 cells in vivo in nude mice tumor model.
Conclusions
KLF8 possibly involved in regulating the cell growth, invasion, apoptosis, and proliferation of renal carcinoma cancer cells. Blocking the KLF8 channel might be a potential therapeutic strategy for RCC.
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Acknowledgments
We thank Dr. Ai-Wu Ke and Dr Xin-Rong Yang from Liver Cancer Institute of Zhongshan Hospital, Fudan University for helpful discussions and for critical reading of the manuscript, and we are grateful to our colleagues in Experimental Research Center of Zhongshan Hospital.
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We declare that we have no conflict of interest.
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W.-J. Fu and J.-C. Li contributed equally to this work.
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Fu, WJ., Li, JC., Wu, Xy. et al. Small interference RNA targeting Krüppel-like factor 8 inhibits the renal carcinoma 786-0 cells growth in vitro and in vivo. J Cancer Res Clin Oncol 136, 1255–1265 (2010). https://doi.org/10.1007/s00432-010-0776-0
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DOI: https://doi.org/10.1007/s00432-010-0776-0