Abstract:
:The loss of E-cadherin expression and the translocation of beta-catenin to the nucleus are frequently associated with the metastatic conversion of epithelial cells. In the nucleus, beta-catenin binds to the TCF/LEF-1 (T-cell factor/ lymphoid enhancer factor) transcription factor family resulting in the activation of several genes, some of them having important implications in tumour progression. In our study, we investigated the potential regulation of monocyte chemotactic protein-1 (MCP-1/CCL2) expression by the beta-catenin/TCF pathway. This CC-chemokine has been implicated in tumour progression events such as angiogenesis or tumour associated macrophage (TAM) infiltration. We thus demonstrated that MCP-1 expression correlates with the reorganization of the E-cadherin/beta-catenin complexes. Indeed, MCP-1 was expressed by invasive breast cancer cells (MDA-MB-231, BT549 and Hs578T), which do not express E-cadherin but was not produced by noninvasive breast cancer cell lines (MCF7 and T47D) expressing high level of E-cadherin. In addition, the MCP-1 promoter was activated in BT549 breast cancer cells transfected with beta-catenin and TCF-4 cDNAs. The MCP-1 mRNA level was similarly upregulated. Moreover, we showed that MCP-1 mRNA was downregulated after transfection with a siRNA against beta-catenin in both BT549 and Hs578T cells. Our results therefore identify MCP-1 as a target of the beta-catenin/TCF/LEF pathway in breast tumour cells, a regulation which could play a key role in breast tumour progression.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Mestdagt M,Polette M,Buttice G,Noël A,Ueda A,Foidart JM,Gilles Cdoi
10.1002/ijc.21291keywords:
subject
Has Abstractpub_date
2006-01-01 00:00:00pages
35-42issue
1eissn
0020-7136issn
1097-0215journal_volume
118pub_type
杂志文章abstract::Sexually transmitted genital human papillomavirus (HPV) infection, most often HPV 16, is considered the major etiologic determinant of cervical cancer. However, some studies have found relatively low prevalences of genital tract HPV DNA in some geographical areas, such as Greenland, that have high rates of cervical ca...
journal_title:International journal of cancer
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journal_title:International journal of cancer
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