Abstract
Abnormal expression of insulin-like growth factor I receptor (IGF-IR) is associated with hepatocellular carcinoma (HCC) progression with largely unknown mechanisms. In this study, IGF-IR expression among different HCC cell lines and silencing its gene transcription on effects of HCC were investigated by short hairpin RNA (shRNA). Specific shRNA was successfully transfected into Bel-7404 or PLC/PRF/5 cells with 90 or 71 % efficiency. The inhibiting rate of IGF-IR at mRNA level were 54.9 % in Bel-7404 or 59.6 % in PLC/PRF/5 cells in accordance with its protein suppression, with the cell cycles at the G1 phase arrest and decreasing cyclinD1 via promoting apoptosis in vitro. With the xenograft models of PLC/PRF/5 cells inserted specific shRNA in vivo, the tumor-forming time (14.0 ± 1.1 days) or tumor volume (143 ± 24 mm3) in the shRNA group was significantly lengthened or smaller than those in the control group (7.2 ± 0.8 days or 372 ± 46 mm3, P < 0.001) or in the neg-shRNA group (7.5 ± 1.0 days or 350 ± 50 mm3, P < 0.001). Silencing the IGF-IR gene transcription inhibited cell proliferation or xenograft tumor growth of HCC, suggesting that IGF-IR might be a novel potential target for HCC gene therapy.
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Abbreviations
- AFP:
-
Alpha-fetoprotein
- FQ-RT-PCR:
-
Fluorescence quantitative reverse transcriptase-PCR
- HBV:
-
Hepatitis B virus
- HCC:
-
Hepatocellular carcinoma
- HCV:
-
Hepatitis C virus
- IGF:
-
Insulin-like growth factor
- IGF-II:
-
Insulin-like growth factor II
- IGF-IR:
-
Insulin-like growth factor I receptor
- miRNA:
-
MicroRNA
- shRNA:
-
Short hairpin RNA
- siRNA:
-
Small interfering RNA
- PPP:
-
Picropodophyllin
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Acknowledgments
This work was supported by grants-in-aid from the Projects of Nantong Society Development (HS2014078), the Jiangsu Health Projects (2014-YY-028 and 2013-WSN-011), the Priority Academic Program Development of Jiangsu (PADA), and the International S. & T. Cooperation Program of China (2013DFA32150). And we thank T. FitzGibbon, M.D., for comments on earlier drafts of the manuscript.
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Min Yao, Li Wang, and Junling Yang contributed equally to this work
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Yao, M., Wang, L., Yang, J. et al. IGF-I receptor as an emerging potential molecular-targeted for hepatocellular carcinoma in vitro and in vivo . Tumor Biol. 37, 14677–14686 (2016). https://doi.org/10.1007/s13277-016-5296-3
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DOI: https://doi.org/10.1007/s13277-016-5296-3