NDLI: PiR-55490 inhibits the growth of lung carcinoma by suppressing mTOR signaling

Content Provider	Springer Nature Link
Author	Peng, Liping Song, Lei Liu, Chaoying Lv, Xiaohong Li, Xiaoping Jie, Jing Zhao, Dan Li, Dan
Copyright Year	2015
Abstract	Lung carcinoma is the most common human cancer with poor prognosis and has an increasing incidence in recent years. However, the related mechanism of lung cancer onset has not been completely explored. Piwi-interacting RNA (piRNA) is a type of noncoding small RNA with established function in germ cells, and interestingly, piRNA has also been shown to be implicated in cancer biology. In this study, piR-55490 was found to be silenced in lung carcinoma specimens and cell lines, compared with normal lung tissues and cells. Intriguingly, the expression level of piR-55490 is negatively associated with patients’ survival. Restoration of piR-55490 can reduce the proliferation rates of lung cancer cells, while piR-55490 suppression led to the gain in the proliferation rates. Animal model study showed that piR-55490 can suppress the growth of lung carcinoma xenograft. Further study revealed that piR-55490 suppressed the activation of Akt/mTOR pathway in lung cancer cells. Surprisingly, piR-55490 was found to bind 3′UTR of mTOR messenger RNA (mRNA) and induce its degradation in a mechanism similar to microRNA (miRNA). The introduction of an mTOR construct resistant to action of piR-55490 was able to abolish the effect of piR-55490 on lung cancer cells. In conclusions, we found that piRNA can contribute to the suppression of cancer cell phenotypes by directly targeting a oncogene mRNA. This finding facilitates our understanding of piRNA’s function and its association with human cancer.
Starting Page	2749
Ending Page	2756
Page Count	8
File Format	PDF
ISSN	10104283
Journal	Tumor Biology
Volume Number	37
Issue Number	2
e-ISSN	14230380
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-09-25
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Lung cancer piRNA Akt/mTOR Cancer Research
Content Type	Text
Resource Type	Article
Subject	Medicine Cancer Research

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