Abstract |
Recent researches demonstrate that microRNAs ( miRNAs) are deregulated in numerous cancers and involved in tumorigenesis, whereas their influences on pancreatic cancer (PC) still need further elucidation. The present research revealed that miR-494 was significantly decreased in PC cell lines and tissues. Functional study showed that overexpressed miR-494 could remarkably inhibit proliferation of PC cells both in vitro and in vivo, which was due to induction of apoptosis, G1-phase arrest and senescence. Moreover, upregulated miR-494 significantly prohibited invasion of PC cells. Meanwhile, both c-Myc and SIRT1 was identified as targets of miR-494 through dual luciferase assay and further confirmed by the reverse correlation between miR-494 and c-Myc/ SIRT1 in PC samples. Furthermore, co-transfection with c-Myc-RNAi and SIRT1-RNAi synergistically reduced c-Myc and SIRT1 expression, and inhibited proliferation of PC, which simulated the effects of miR-494 overexpression. On the contrary, co-overexpression of c-Myc and SIRT1 effectively rescued inhibition of overexpressed miR-494 on PC cells. The clinical characteristics further revealed that low miR-494 correlated with larger tumor size, late tumor node metastasis stage, lymphatic invasion, distant metastasis and poor prognosis. In conclusion, the present study indicated that miR-494 might serve as predictor and inhibitor in PC by directy downregulating the loop of c-Myc and SIRT1.
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Authors | Y Liu, X Li, S Zhu, J-g Zhang, M Yang, Q Qin, S-c Deng, B Wang, K Tian, L Liu, Y Niu, C-y Wang, G Zhao |
Journal | Gene therapy
(Gene Ther)
Vol. 22
Issue 9
Pg. 729-38
(Sep 2015)
ISSN: 1476-5462 [Electronic] England |
PMID | 25965392
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- MIRN494 microRNA, human
- MYC protein, human
- MicroRNAs
- Proto-Oncogene Proteins c-myc
- SIRT1 protein, human
- Sirtuin 1
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Topics |
- Aged
- Animals
- Cell Line, Tumor
- Cell Proliferation
- Drug Resistance, Neoplasm
- Ectopic Gene Expression
- Female
- Heterografts
- Humans
- Male
- Mice, Inbred BALB C
- Mice, Nude
- MicroRNAs
(metabolism)
- Middle Aged
- Neoplasm Invasiveness
- Pancreatic Neoplasms
(diagnosis, metabolism)
- Prognosis
- Proto-Oncogene Proteins c-myc
(metabolism)
- Sirtuin 1
(metabolism)
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