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Understanding the CREB1-miRNA feedback loop in human malignancies

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Tumor Biology

Abstract

cAMP response element binding protein 1 (CREB1, CREB) is a key transcription factor that mediates transcriptional responses to a variety of growth factors and stress signals. CREB1 has been shown to play a critical role in development and progression of tumors. MicroRNAs (miRNAs) are a class of non-coding RNAs. They post-transcriptionally regulate gene expression through pairing with the 3′-UTR of their target mRNAs and thus regulate initiation and progression of various types of human cancers. Recent studies have demonstrated that a number of miRNAs can be transcriptionally regulated by CREB1. Interestingly, CREB1 expression can also be modulated by miRNAs, thus forming a feedback loop. This review outlines the functional roles of CREB1, miRNA, and their interactions in human malignancies. This will help to define a relationship between CREB1 and miRNA in human cancer and develop novel therapeutic strategies.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 81372856) and Taishan Scholars Program of Shandong Province (No. ts201511096). We thank Dr. Hsin-Sheng Yang (Graduate Center for Toxicology, University of Kentucky) and Dr. Tiantian Liu (Department of Pathology, School of Medicine, Shandong University) for their critical reading and suggestions for the manuscript.

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Online Resource Figure S1

Relationship between CREB1 and miR-27b in gastric cancer, and potential regulation of CREB1 on miR-27b. (a) The expression of CREB1 and miR-27b were detected respectively by immunohistochemistry (IHC) and quantitative real-time PCR (qRT-PCR) in gastric cancer tissues (for more detail, see our previous paper: Wang et al. Oncotarget. 2015). Spearman’s correlation analysis showed that CREB1 was positively correlated with miR-27b in gastric cancer tissues (r = 0.3563, P = 0.0007). (bc) miRStart (http://mirstart.mbc.nctu.edu.tw/home.php) was utilized to get the putative transcription start sites and promoter sequences of miR-27b. Then the potential biding sites for CREB1 were predicted by RegRNA2.0 (http://regrna2.mbc.nctu.edu.tw/detection.html) and PROMO database (http://alggen.lsi.upc.es/cgi-bin/promo_v3/promo/promoinit.cgi?dirDB = TF_8.3). The analysis revealed the presence of several CREB1-binding sites in the putative promoter of miR-27b (PDF 83 kb)

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Wang, YW., Chen, X., Ma, R. et al. Understanding the CREB1-miRNA feedback loop in human malignancies. Tumor Biol. 37, 8487–8502 (2016). https://doi.org/10.1007/s13277-016-5050-x

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