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Oncogene. 2014 Apr 17;33(16):2065-74. doi: 10.1038/onc.2013.166. Epub 2013 May 20.

Profilin-1 downregulation has contrasting effects on early vs late steps of breast cancer metastasis.

Author information

1
Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
2
1] Department of Pathology, University of Pittsburgh, Pittsburgh, PA, USA [2] Magee Women's Hospital, Pittsburgh, Pittsburgh, PA, USA.
3
Department of Ophthalmology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
4
Department of Cell Biology and Anatomy, Albert Einstein College of Medicine, New York, NY, USA.
5
1] Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA [2] Department of Pathology, University of Pittsburgh, Pittsburgh, PA, USA [3] McGowan Institute of Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
6
1] Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA [2] Department of Pathology, University of Pittsburgh, Pittsburgh, PA, USA [3] McGowan Institute of Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA [4] Magee Women's Research Institute, University of Pittsburgh, Pittsburgh, PA, USA.

Abstract

Profilin1 (Pfn1), a ubiquitously expressed actin-binding protein, has an indispensable role in migration and proliferation of normal cells. Seemingly contrary to its essential cellular functions, Pfn1's expression is downregulated in breast cancer, the significance of which is unclear. In this study, expression profiling of Pfn1 in human breast cancer specimens correlates lower Pfn1 expression levels with propensity to metastasize. Xenograft experiments further establish a causal relationship between loss of Pfn1 expression and increased dissemination of breast cancer cells (BCCs) from the primary mammary tumor. BCCs exhibit a hyperinvasive phenotype (marked by matrix metalloproteinase-9 upregulation, faster invasion through collagen matrix) and acquire increased proficiency to transmigrate through endothelial barrier (an obligatory step for vascular dissemination) when Pfn1 expression is suppressed. In Pfn1-deficient cells, hyperinvasiveness involves a phosphatidylinositol 3-kinase-PI(3,4)P2 signaling axis while augmented transendothelial migration occurs in a vascular endothelial growth factor-dependent manner. Contrasting these dissemination promoting activities, loss of Pfn1, however, dramatically inhibits metastatic outgrowth of disseminated BCCs, suggesting that Pfn1 has a key role in the metastatic colonization process. In summary, this study shows that Pfn1 has a dichotomous role in early vs late steps of breast cancer metastasis.

PMID:
23686314
PMCID:
PMC3834125
DOI:
10.1038/onc.2013.166
[Indexed for MEDLINE]
Free PMC Article
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