Abstract:
:Cancers are initiated as a result of changes that occur in the genome. Identification of gains and losses in the structure and expression of tumor-suppressor genes and oncogenes lies at the root of the understanding of cancer cell biology. Here, we show that the mitogen-activated protein kinase (MAPK) MKK3 suppresses the growth of breast cancer, in which it varies in copy number. A pervasive loss of MKK3 gene copy number in patients with breast cancer is associated with an impairment of MKK3 expression and protein level in malignant tissues. To assess the functional role of MKK3 in breast cancer, we showed in an animal model that MKK3 activity is required for suppression of tumor growth. Active MKK3 enhanced expression of the cyclin-dependent kinase inhibitors p21(Cip1/Waf1) and p27(Kip1), leading to increased cell-cycle arrest in G1 phase of the cell cycle. Our results reveal the functional significance of MKK3 as a tumor suppressor and improve understanding of the dynamic role of the MAPK pathway in tumor progression.
journal_name
Cancer Resjournal_title
Cancer researchauthors
MacNeil AJ,Jiao SC,McEachern LA,Yang YJ,Dennis A,Yu H,Xu Z,Marshall JS,Lin TJdoi
10.1158/0008-5472.CAN-13-1310subject
Has Abstractpub_date
2014-01-01 00:00:00pages
162-72issue
1eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-13-1310journal_volume
74pub_type
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