Abstract:
:Melanoma-associated antigen A1 (MAGEA1) is member of the MAGE gene family that is expressed in male germ line cells and placenta under normal physiological conditions. Although MAGEA1's expression levels have been evaluated as one of the cancer testis (CT) antigens for immunotherapy in melanoma and several other cancers, its functional role and signaling mechanisms are largely unknown. In this study, we examined the functional involvement and signaling mechanisms of MAGEA1 in breast and ovarian cancer cells. Inhibitory effects of MAGEA1 on cell proliferation and migration were observed using both gain-of- (MAGEA1 overexpression) and loss-of- (siRNA interference) function approaches in breast (MCF-7 and MDA-MB-231) and ovarian (SKOV3 and SKOV3ip) cancer cell lines. We revealed a novel interaction between MAGEA1 and the intracellular segment of NOTCH1 receptor (NICD1). MAGEA1 reduced NICD1's stability by promoting the ubiquitin modification of NICD1. MAGEA1 also interacted with FBXW7, subunit of E3 ubiquitin protein ligase complex SCF, and the latter was functionally involved in NICD1 ubiquitination and degradation. In addition, siRNA interference of FBXW7 reversed the inhibitory effect of MAGEA1 on migration and proliferation of MCF-7 and MDA-MB-231 cells. These newly discovered MAGEA1-NICD1 and MAGEA1-FBXW7 interactions have potential clinical implications in breast and ovarian cancer treatment.
journal_name
Oncogenejournal_title
Oncogeneauthors
Zhao J,Wang Y,Mu C,Xu Y,Sang Jdoi
10.1038/onc.2017.131subject
Has Abstractpub_date
2017-08-31 00:00:00pages
5023-5034issue
35eissn
0950-9232issn
1476-5594pii
onc2017131journal_volume
36pub_type
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