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Flotillin-2 deficiency leads to reduced lung metastases in a mouse breast cancer model.
MedLine Citation:
PMID:  23146906     Owner:  NLM     Status:  Publisher    
Flotillin microdomains, specialized lipid raft domains in cell membranes, serve as physical platforms for many different molecules important in crucial intracellular signaling pathways. Flotillin-2 (Flot2), together with flotillin-1, is a marker for lipid raft microdomains distinct from caveolar lipid rafts, and has been implicated in the progression of cancer and metastasis formation. Based largely on studies in xenograft models, flotillin-2 has been implicated in the progression of multiple types of human tumors, including breast cancer. In our studies, we identified flotillin-2 as highly amplified in a high-throughput comparative genomic hybridization screen of human breast cancer cell lines and breast tumor samples. Short hairpin RNA-mediated reduction of flotillin-2 protein levels significantly reduced the tumorigenicity and metastatic capability of a human breast cancer cell line in vivo. We generated mice deficient for flotillin-2 and also found a reduction of flotillin-1 protein levels and complete absence of flotillin-specific membrane microdomains in these mice. To examine the role of Flot2 in mammary tumorigenesis and lung metastasis, we used an in vivo molecular genetics approach, crossing a well-characterized transgenic mouse model of breast cancer, the MMTV-PyMT (mouse mammary tumor virus-polyoma middle T antigen) mouse, with gene-targeted Flot2(-/-) mice. Flotillin-2 deficiency lead to a striking reduction in the number of lung metastasis observed, but had no influence on primary tumor formation in this model. Our results indicate, using a novel in vivo animal model approach, that Flot2 is an important regulator of mammary tumor-derived lung metastasis.Oncogene advance online publication, 12 November 2012; doi:10.1038/onc.2012.499.
T Berger; T Ueda; E Arpaia; I I C Chio; E A Shirdel; I Jurisica; K Hamada; A You-Ten; J Haight; A Wakeham; C C Cheung; T W Mak
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-12
Journal Detail:
Title:  Oncogene     Volume:  -     ISSN:  1476-5594     ISO Abbreviation:  Oncogene     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8711562     Medline TA:  Oncogene     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
The Campbell Family Institute for Breast Cancer Research, University Health Network, Toronto, ON, Canada.
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