Inhibition of tissue factor signaling in breast tumour xenografts induces widespread changes in the microRNA expression profile.

Tissue factor (TF) is a transmembrane receptor for coagulation factor VII/VIIa and is frequently overexpressed by cancer cells. The TF/VIIa complex acts as the main initiator of the clotting cascade in blood and a trigger of intracellular signaling that changes gene expression and the cellular phenotype. However, pathways mediating these changes are still poorly characterized and especially the impact of TF signals on regulatory microRNA (miR) networks in cancer remains unknown. We show that the monoclonal antibody that selectively neutralises the signaling (but not coagulant) function of human TF (CNTO 2559) inhibits progression of MDA-MB-231 breast cancer xenografts in mice and prolongs animal survival. CNTO 2559 blocks FVIIa-induced expression of interleukin 8 (IL-8) by cancer cells without impacting factor Xa (FXa) generation. Notably, acute exposure of MDA-MB-231 tumour xenografts to CNTO 2559 systemic injections triggers wide spread changes in the tumour miR profile including alterations in 75 miRs (55 downregulated) and impacting several miR-regulated and cancer-related pathways. These results suggest that TF signaling in the tumour microenvironment may provoke vast changes in the miR profile of cancer cells, affect disease biology, and reflect tumour interaction with the coagulation system, thereby presenting itself as a possible biomarker.

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