Tissue factor in tumor microenvironment: a systematic review
© Han et al.; licensee BioMed Central Ltd. 2014
Received: 18 June 2014
Accepted: 9 July 2014
Published: 1 August 2014
The aberrant hemostasis is a common manifestation of cancer, and venous thromboembolism (VTE) is the second leading cause of cancer patients’ mortality. Tissue factor (TF), comprising of a 47-kDa transmembrane protein that presents in subendothelial tissues and leukocytes and a soluble isoform, have distinct roles in the initiation of extrinsic coagulation cascade and thrombosis. Laboratory and clinical evidence showed the deviant expression of TF in several cancer systems and its tumor-promoting effects. TF contributes to myeloid cell recruitment in tumor stroma, thereby remodeling of tumor microenvironment. Additionally, the number of TF-positive-microparticles (TF+MP) from tumor origins correlates with the VTE rates in cancer patients. In this review, we summarize our current understanding of the TF regulation and roles in tumor progression and clinical complications.
KeywordsTissue factor Tumor microenvironment Venous thromboembolism Microparticles Coagulation
Tissue factor (TF), which consist of a 47-KDa-glycoprotein consisting of 263 amino acids (aa) (also named full-length TF (flTF) factor III, thromboplastin, or CD142) and an alternatively splice isoform, are encoded by F3 gene. The F3 gene locates on chromosome 1p22-p21 and contains 6 exons that produce a precursor protein with 294 amino acids. After posttranscriptional modification, the functional structure of precursor turns out to be a sausage shape membrane protein consisting of an extracellular domain (219 aa), a transmenbrane residue (23 aa) and a cytoplasmic part (21 aa) . flTF is critical to initiate the extrinsic coagulation cascade in response to vascular endothelial disruption and enhances cell proliferation and migration .
The alternatively splice isoform of TF was identified in 2003. As this isoform is a splice variant, it was named alternatively spliced tissue factor (asTF). Compared to flTF, asTF is translated by a truncated mRNA transcript that lacks exon 5. Exon 5 of TF contains an exonic splicing enhancer (ESE) sequence motif, which can bind to the serine/arginine-rich proteins alternative splicing factor/pre-mRNA-splicing factor SF2 (ASF/SF2) and serine-rich protein55 (SRp55), leading to the generation of flTF mRNA and translation of the flTF isoform protein . The fusion of exon 4 and 6 creates a frameshift mutation and leads to a unique C-terminus, which enables asTF to be soluble and be secreted into extracellular fluids . The coagulation activity of asTF has been debated since it was identified. Because asTF retains the conserved residues Lys165 and Lys166 which are important for substrate recognition during TF/factor VII activated (FVIIa) complex formation, some researchers believe that asTF maintains the factor X activated (FXa) generation ability and promote coagulation. Indeed, its presence in thrombi was demonstrated . TNF-α and IL-6 enhanced TF-induced coagulation in human umbilical venous endothelial cells (HUVECs) . However, the location on a phospholipid membrane, a prerequisite for efficient macromolecular substrate binding, was abolished by the soluble C-terminus of asTF, which may result in the disability of its pro-coagulant effect. Meanwhile, the experimental methods used in those studies did not exclude the possibility that the coagulant activity might be due to flTF indirectly, since it is extremely difficult to distinguish the precise role of two TF isoforms in coagulation in pro-coagulant assay . Moreover, in FX activation assay, the cell lysate of asTF_FLAG-transfected HEK293 cells could not lead to FX activation, while flTF_FLAG-transfected HEK293 cells showed significant conversion of FX to FXa . To date, no tissue and/or naturally occurring biological settings have been described that asTF is present without the full length isoform flTF  new approaches with higher sensitivity and specificity are needed for this scientific issue.
In 1865, Armand Trousseau first described thrombophlebitis (also known as Trousseau’s syndrome) as a complication of pancreatic cancer. Since then, the idea that TF is involved in cancer development, including cell proliferation, survival, angiogenesis, epithelial-to-mesenchymal transition (EMT), and metastasis, has been gradually accepted ,-. In some malignant cancer systems, elevated TF expression can be detected in the serum as well as in tumor tissues -. In addition, tumor-derived TF-positive microparticles (TF+-MPs) are abundant in the plasma of patients with advanced diseases -, which also highly correlates with venous thromboembolism (VTE) ,. These findings indicate that targeting TF have potential significance for tumor diagnosis and therapy.
In this review, we shall overview the current understanding of the regulation and functions of TF in different stages of cancer progression. TF-related complications in tumor patients and TF-targeted therapy in clinical trials will also be discussed.
Sources of TF and their regulation in cancer
Ectopic expression of TF has been detected in several type of cancers, including cervical cancers , epithelial ovarian cancer (EOC) , breast cancer , brain tumors , pancreatic cancer , gastric cancer , prostate cancer , colorectal cancer (CRC) , lung cancer , melanoma , and several cancer cell lines, including human promyelocytic leukemia tumor cell lines HL-60, glioma cell line U343, gastric cell line KATOIII, SNU-5 and MKN-74, colon cancer line HCT116, epidermoid carcinoma cell line A431, melanoma cell line WM1341B and WM938A ,. In addition, endothelial cells of tumor blood vessels, fibroblast and inflammatory cells also express TF ,. Cervical tumors, pancreatic cancer and breast cancer specimens expressed asTF in both tumor cells and the stroma ,,. Two distinct forms of flTF, membrane-bound flTF  and TF+-MPs , are important for malignancy progression. Both tumor cells and monocytes are the main sources of TF+-MPs. Platelets and neutrophils also contribute to the production of TF+-MPs . For the detail cell source of TF, see online GEO database (GSE3239).
Collectively, TF is universally expressed in tumor cells, immune cells and stromal cells. Its overexpression in tumors suggests a potential marker and therapeutic target for cancer. Understanding the roles of TF in cancer could potentially improve our knowledge of carcinogenesis.
Functions of TF in tumor progression
TF regulates tumor cell proliferation and apoptosis
flTF and asTF promote tumor cell proliferation through different mechanisms (Figure 2) ,. flTF/FVIIa complex can activate PAR2, leading to AP-1 phosphorylation, cell proliferation and migration in the colon cancer SW620 cell line . Furthermore, activation of PAR2 by flTF induces protein kinase Cα (PKCα) phosphorylation and translocation from the cytoplasm to the perinuclear region, promotes ERK1/2 and NF-κB phosphorylation . Breast cancer cell apoptosis can be suppressed by flTF via PI3K/Akt signaling pathway and reducing IL-8 and death-associated protein kinase 1 (DAPK1) . The variant isoform asTF also promotes tumor growth in pancreatic and lung cancer setting ,,. Different from flTF, asTF enhances tumor cell proliferation through integrin signaling  which was also reviewed in detail by Leppert et al. in 2014 .
TF promotes tumor angiogenesis and metastasis
Blood vessels in tumor tissues are essential for tumor progression, and neovasculature is a prerequisite for blood-borne metastasis. In primary breast cancer cells, flTF/FVIIa/PAR2 induces the production of pro-angiogenic factors and immune regulators . Meanwhile, evidence from Hobbs et al. demonstrated that nude mice carrying asTF-overexpressing pancreatic ductal adenocarcinoma cells developed significantly larger tumors and increased angiogenesis than flTF-overexpressing cells . asTF enhances pro-angiogenesis and pro-migration ability of cardiac cells via inducing angiogenesis- and migration-promoting factors such as fibroblast growth factor 2 (FGF2), cysteine-rich 61 (Cyr61) and vascular endothelial growth factor (VEGF). Meanwhile, monocytic THP-1 cells exhibit enhanced migration after treated with the supernatant of asTF-overexpressing mouse cardiomyocytic HL-1 cell . Hypoxia exposure induces asTF expression in A549 cells through alternative splicing factors Clk1 and Clk4. The elevated asTF promotes the tube formation of A549 cells by increasing Cyr61, CC chemokine ligand (CCL2) and VEGF . Different from flTF-PAR interaction, asTF possesses its potent pro-angiogenic properties through interacting with integrin β1 and β3 in endothelial cell, eliciting focal adhesion kinase (FAK), p42/p44, p38 MAPK and Akt phosphorylation . 6B4, an antibody which disrupts the TF-integrin interaction, can efficiently inhibit the pro-angiogenic function of asTF .
In addition to the pro-angiogenic effects in cancer, TF also regulate cytoskeleton remodeling, which enhances tumor cell migration and subsequently promotes metastasis. flTF stimulates tumor cell migration through cytoplasmic domain by activating p38 in a Rac 1 dependent manner . Specific interaction between the flTF cytoplasmic domain with actin-binding protein 280 (ABP-280) also contributes to tumor cell metastasis and vascular remodeling . However, flTF exhibits its pro-metastatic characteristics mainly by initiating the pro-coagulant cascade, including thrombin formation, fibrin generation and platelet activation ,. The fibrin (ogen)-platelet clot formation is essential for generating a shield around tumor cells to facilitate the spread of tumor cells and the escape of newly formed micrometastasis from natural killer (NK) cell-mediated cytolysis ,. TFPI, an inhibitor of TF, can significantly reduce the metastasis of B16F10 murine melanoma cells . The TF-induced coagulation can promote TAMs recruitment and the establishment of the pro-metastatic niche .
Cancer stem cells (CSC), which express CD133 , CD44, ATP-binding cassette sub-family G member 2 (ABCG2) and Aldehyde dehydrogenases (ALDH) , are a subpopulation of tumor cells that display self-renewal and the ability to give rise to heterogeneous lineages of cancer cells. These heterogeneous cells are responsible for tumor initiation, angiogenesis, and metastasis. Results from our lab revealed that CD133+ ovarian cancer stem cells remarkably over express flTF compared with CD133− cancer cells . Moreover, evidence from Chloe C. Milsom and her colleagues demonstrated that the TF-blocking antibody (CNTO 859) delays A431 cell initiation and metastasis through blocking EMT . The functions of TF in angiogenesis and metastasis as well as the location of CSCs in the perivascular niche suggest that the interfering with CSCs by targeting TF would be of interest and worth for further research.
Hence, the expression of TF can effectively enhance angiogenesis and coagulation-associated metastasis via either the interaction of the cytoplasmic domain with the PAR family, or through the integrin signaling pathway (Figures 2 and 3).
TF modulate immune responses within the tumor microenvironment
Cytotoxic T lymphocytes and NK cells are the major effector cells mediating anti-tumor immunity. However, anti-tumor immunity is abrogated primarily due to the dysfunction of cytotoxic T lymphocytes and NK cells and the accumulation of myeloid-derived suppressor cells (MDSCs) in the tumor microenvironment . As mentioned above, flTF is responsible for local thrombin generation and fibrin deposition. Once thrombin is generated, it can directly cleaves complement component C5 to produce C5a and C5b . C5a, also known as anaphylatoxin, has a pro-tumor effect via recruiting MDSCs to the tumor microenvironment, resulting in an immunosuppressive milieu  (Figure 3). Meanwhile, TF-mediated thrombosis within the tumor microenvironment may cause local ischemia and hypoxia, leading to the local inflammatory response and tumor tissue necrosis. The TF-induced hypoxia could in turn upregulate flTF, Clk1 and Clk4, resulting in asTF production . This potential positive feedback loop may contribute to tumor cell proliferation and angiogenesis, as well as increase MDSC infiltration within the tumor microenvironment. TF-triggered tumor cell-clot formation induces vascular cell adhesion molecule-1 (VCAM-1) expression and the recruitment of myeloid cells, and promotes tumor invasion and metastasis . Taken together, TF assists tumor cells to metastasis and escape from the host immune system via modulating the tumor microenvironment.
TF expression correlates with increased VTE
Since VTE, particularly deep venous thrombosis of the lower extremities and pulmonary embolism, comprises the second leading cause of death in cancer patients , efficient anticoagulation therapies are of profound clinical importance. Clinical studies indicate that administration of low molecular weight heparins (LMWH) in cancer patients significantly improves survival -.
The phosphatidylserine (PS) acts synergistically with flTF to amplify its role as a coagulation initiator ,. Both flTF and PS in systemic circulation assemble on the surface of MPs from tumors, resulting in the formation of the coagulation complex. Therefore, circulating tumor cell-derived TF+-MPs may trigger venous thrombosis formation in the absence of vessel injury. TF+-MPs in the systemic circulation of patients with advanced colorectal cancer increased the risk of VTE by two fold when compared with healthy controls . Another study showed that cancer patients suffering from VTE had a higher level of TF+-MPs compared with those without VTE . In addition to the plasma antigen level, an increase of TF+-MPs activity in cancer patients with VTE was reported by several groups. Tessellar et al. observed a higher level of TF+-MPs activity in acute VTE patients than in patients without VTE ,. Owens and Mackman found elevated MP-TF activity in 9 of 11 patients . Similarly, Zwicher et al. reported a 7-fold increased risk of thrombosis in VTE-free patients with elevated TF+-MP levels than in VTE-free plus TF+-MPs negative patients . The association between mortality and the level of TF+-MPs was also demonstrated. Tesselaar and Bharthuar individually reported that in breast cancer and pancreaticobiliary cancer, patients with VTE, who presented higher level of MP-TF activity, had a lower survival rate than patients with lower levels of MP-TF activity ,. These studies indicate that TF+-MP amount and MP-TF activity may have prognostic values in cancer patients.
Conclusion and prospective
In conclusion, the traditional extrinsic coagulation pathway initiator flTF and its isoform actively participate in malignant disease progression. The signaling pathways associated with TF are critical for tumor initiation, growth, angiogenesis and metastasis and clinical complications such as VTE. Targeting flTF and anticoagulation therapies have already been used for several types of cancer . Understanding the precise regulatory mechanisms of flTF as well as its soluble isoform asTF in tumor progression could be of potential interest for improving the theory of tumor immunoediting and developing individual therapeutic strategies for cancer.
Actin-binding protein 280
ATP-binding cassette sub-family G member 2
Activated protein C
Acute promyelocytic leukemia
Alternative splicing factor/pre-mRNA-splicing factor SF2
Alternatively spliced tissue factor
All-trans retinoic acid
CC chemokine ligand
CDC-2 like kinases
Cancer stem cells
Epidermal growth factor receptor
Early growth response gene-1
Epithelial ovarian cancer
Exonic splicing enhancer
Focal adhesion kinase
Fibroblast growth factor
Full-length tissue factor
Hepatocyte growth factor
c-Jun amino-terminal kinase
Low molecular weight heparins
Membrane attack complex
Mitogen-activated protein kinase
Myeloid-derived suppressor cells
Malignant pleural mesothelioma
Non-small cell lung cancer
Ovarian cancer stem cells
p21-activated kinase 1
Platelet-derived growth factor
Protein kinase Cα
Tumor associated macrophages
Tissue factor-positive microparticles
Tissue factor pathway inhibitor
Vascular cell adhesion molecule-1
Vascular endothelial growth factor
This work is supported by National Nature Science Foundation of China (No. 81372271, No. 81071772, and No. 81222031) and by National Key Basic Research Program of China (973 program, No. 2010CB529404 and No. 2012CB526603).
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