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MicroRNA-122 confers sorafenib resistance to hepatocellular carcinoma cells by targeting IGF-1R to regulate RAS/RAF/ERK signaling pathways

Xu, Yanmin, Huang, Ji, Ma, Leina, Shan, Juanjuan, Shen, Junjie, Yang, Zhi, Liu, Limei, Luo, Yongli, Yao, Chao, Qian, Cheng·2016·Cancer Letters
DOI 10.1016/j.canlet.2015.11.034
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Abstract

Sorafenib is the first-line treatment for advanced hepatocellular carcinoma (HCC), but the clinical response to sorafenib is seriously limited by drug resistance. In this study, we investigated the molecular mechanisms of sorafenib resistance in HCC cells. Our miRNA microarray data indicate that liver-specific miR-122 expression was significantly reduced in sorafenib-resistant cells. Overexpression of miR-122 made drug-tolerant cells sensitive to sorafenib and induced apoptosis. Insulin-like growth factor 1 receptor (IGF-1R) was validated as a target of miR-122 and was repressed by this miRNA. miR-122-induced apoptosis was repressed by the IGF-1R activator IGFI or IGFII. Conversely, the IGF-1R inhibitor PPP or NVP-AEW541 in combination with sorafenib significantly induced cell apoptosis and disrupted tolerance to drugs in vitro. These results indicated that activation of IGF-1R by ectopic down-regulation of miR-122 counteracted the effects of sorafenib-induced apoptosis, thus conferring sorafenib resistance. Further study revealed that activation of IGF-1R by miR-122 down-regulation contributed to activation of RAS/RAF/ERK signaling, which was associated with drug resistance. Our data imply that an intimate correlation between miR-122 and IGF-1R abnormal expression is a critical determinant of sorafenib tolerance.

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Metadata

Authors
Xu, Y., Huang, J., Ma, L., Shan, J., Shen, J., Yang, Z., Liu, L., Luo, Y., Yao, C., & Qian, C.
Venue
Cancer Letters
Publisher
Elsevier BV
Published
2016-02
Volume
371
Issue
2
Pages
171-181
ISSN
0304-3835
DOI
10.1016/j.canlet.2015.11.034
Cited by
148
References
5
Language
en
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Funders
National Natural Science Foundation of China (81330048, 81520108025, 81301864, 81472292, 81572464)

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CoChat. (2026). Citation check: MicroRNA-122 confers sorafenib resistance to hepatocellular carcinoma cells by targeting IGF-1R to regulate RAS/RAF/ERK signaling pathways. https://app.cochat.ai/papers/10.1016/j.canlet.2015.11.034
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Xu, Y., Huang, J., Ma, L., Shan, J., Shen, J., Yang, Z., Liu, L., Luo, Y., Yao, C., & Qian, C. (2016). MicroRNA-122 confers sorafenib resistance to hepatocellular carcinoma cells by targeting IGF-1R to regulate RAS/RAF/ERK signaling pathways. Cancer Letters. https://doi.org/10.1016/j.canlet.2015.11.034