A global microRNA screen identifies regulators of the ErbB receptor signaling network

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• 作者：Annabell Bischoff ; Michaela Bayerlová…
• 关键词：MicroRNA/miRNA ; ErbB3/HER3 ; Heregulin ; PI3K ; Akt pathway ; Breast cancer
• 刊名：Cell Communication and Signaling
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：13
• 期：1
• 全文大小：2,473 KB
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• 刊物主题：Cell Biology; Protein-Ligand Interactions; Receptors; Cytokines and Growth Factors;
• 出版者：BioMed Central
• ISSN：1478-811X

文摘

Background The growth factor heregulin (HRG) potently stimulates epithelial cell survival and proliferation through the binding of its cognate receptor ErbB3 (also known as HER3). ErbB3-dependent signal transmission relies on the dimerization partner ErbB2, a receptor tyrosine kinase that is frequently overexpressed and/or amplified in breast cancer cells. Substantial evidence suggests that deregulated ErbB3 expression also contributes to the transformed phenotype of breast cancer cells. Results By genome-wide screening, we identify 43 microRNAs (miRNAs) that specifically impact HRG-induced activation of the PI3K-Akt pathway. Bioinformatic analysis combined with experimental validation reveals a highly connected molecular miRNA-gene interaction network particularly for the negative screen hits. For selected miRNAs, namely miR-149, miR-148b, miR-326, and miR-520a-3p, we demonstrate the simultaneous downregulation of the ErbB3 receptor and multiple downstream signaling molecules, explaining their efficient dampening of HRG responses and ascribing to these miRNAs potential context-dependent tumor suppressive functions. Conclusions Given the contribution of HRG signaling and the PI3K-Akt pathway in particular to tumorigenesis, this study not only provides mechanistic insight into the function of miRNAs but also has implications for future clinical applications.