Abstract:
BACKGROUND:Increased hemostatic activity is common in many cancer types and often causes additional complications and even death. Circumstantial evidence suggests that tissue factor pathway inhibitor-1 (TFPI) plays a role in cancer development. We recently reported that downregulation of TFPI inhibited apoptosis in a breast cancer cell line. In this study, we investigated the effects of TFPI on self-sustained growth and motility of these cells, and of another invasive breast cancer cell type (MDA-MB-231). METHODS:Stable cell lines with TFPI (both α and β) and only TFPIβ downregulated were created using RNA interference technology. We investigated the ability of the transduced cells to grow, when seeded at low densities, and to form colonies, along with metastatic characteristics such as adhesion, migration and invasion. RESULTS:Downregulation of TFPI was associated with increased self-sustained cell growth. An increase in cell attachment and spreading was observed to collagen type I, together with elevated levels of integrin α2. Downregulation of TFPI also stimulated migration and invasion of cells, and elevated MMP activity was involved in the increased invasion observed. Surprisingly, equivalent results were observed when TFPIβ was downregulated, revealing a novel function of this isoform in cancer metastasis. CONCLUSIONS:Our results suggest an anti-metastatic effect of TFPI and may provide a novel therapeutic approach in cancer.
journal_name
BMC Cancerjournal_title
BMC cancerauthors
Stavik B,Skretting G,Aasheim HC,Tinholt M,Zernichow L,Sletten M,Sandset PM,Iversen Ndoi
10.1186/1471-2407-11-357subject
Has Abstractpub_date
2011-08-17 00:00:00pages
357issn
1471-2407pii
1471-2407-11-357journal_volume
11pub_type
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