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Oncogene ; 36(17): 2394-2404, 2017 04 27.
Article in English | MEDLINE | ID: mdl-27941874

ABSTRACT

Colorectal cancer (CRC) is a complex disease with still unsatisfactory prognosis even in western societies, although substantial progress has been made in pre-screening programs, surgical techniques and targeted therapy options. Mediator of motility-1 (Memo-1) was previously recognized as an important effector of cell migration downstream of receptor tyrosine kinase signaling in breast cancer. This study identified Memo-1 as frequently overexpressed in CRC and established a close link between extracellular HER2 activation, AhR/ARNT transcriptional activity and Memo-1 expression. Dissection of the hMemo-1 gene promoter using reporter assays and chromatin IP techniques revealed recruitment of Aryl hydrocarbon receptor (AhR)/Aryl hydrocarbon receptor nuclear-translocator (ARNT) complex, which positively influenced Memo-1 expression in cancer cells. We found that Memo-1 depletion negatively influenced the cellular actin network and that its expression is required for HER2-mediated cell migration and invasion. Moreover, analyses of Memo-1 expression in primary CRC revealed correlation with clinical parameters that point to Memo-1 as a new prognostic factor of aggressive disease in CRC patients. Altogether, these observations demonstrate that Memo-1 is an important downstream regulator of HER2-driven CRC cell migration and invasion through connecting extracellular signals from membrane to the cytoskeletal actin network.


Subject(s)
Colorectal Neoplasms/pathology , Gene Expression Regulation, Neoplastic , Nonheme Iron Proteins/genetics , Proteins/metabolism , Receptor, ErbB-2/metabolism , Receptor, ErbB-3/metabolism , Receptors, Aryl Hydrocarbon/metabolism , Cell Line, Tumor , Cell Movement , Disease Progression , Humans , Intracellular Signaling Peptides and Proteins , Neoplasm Invasiveness , Promoter Regions, Genetic/genetics , Signal Transduction
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