Cytokines, Adhesion Molecules, and Matrix Metalloproteases as Predisposing, Diagnostic, and Prognostic Factors in Venous Thrombosis
- 1Department of Medicine, Haukeland University Hospital, Bergen, Norway
- 2Section for Hematology, Institute of Clinical Science, University of Bergen, Bergen, Norway
The inflammatory response is a well-established part of, and a prerequisite for, venous thrombosis. To better understand the pathophysiology of venous thrombosis and to identify improved diagnostic biomarkers, further studies of the relationship between inflammation and coagulation are needed. We review previous studies concerning inflammatory biomarkers in venous thromboembolism, in particular cytokines, soluble adhesion molecules and matrix metalloproteases as predisposing, diagnostic and prognostic factors in venous thrombosis. Elevated cytokines and genetic alterations coding for cytokines are found in several patient cohorts which indicate that cytokines are involved as predisposing factors in venous thrombosis development. Increased levels of pro-inflammatory cytokines are detected both in animal models and in patients with acute venous thrombosis and clinical trials, although currently without evident diagnostic value. Adhesion molecules are crucial in the development of venous thrombosis, especially P-selectin seems important in initiating leukocyte accumulation and adhesion to endothelium for subsequent platelet accumulation. Several studies have demonstrated increased soluble P-selectin levels in patients with venous thrombosis, emphasizing its potential role as diagnostic marker and also as a therapeutic target. Matrix metalloproteases are essential effectors during venous thrombosis resolution and may impact vessel wall fibrosis, and together with their natural occurring inhibitors are crucial in acute and chronic thrombosis pathophysiology. Furthermore, studies in animal models of venous thrombosis have demonstrated anti-inflammatory treatment to be effective in terms of thrombus resolution and reduction of vessel wall damage, without increase in bleeding risk during the course of treatment. Thus, soluble mediators should be further investigated both as possible biomarkers and therapeutic targets in venous thromboembolic disease.
Venous thromboembolism (VTE) is one of the most common haematological conditions, associated with increased morbidity and mortality, accounting for over 500,000 deaths per year in the European Union (1). Deep vein thrombosis (DVT) and pulmonary embolism (PE) could be difficult to diagnose, with undiagnosed VTE therefore representing an increased risk of death (1, 2). Improved risk stratification and diagnostic tools are important measures for VTE treatment and prevention (3).
Established risk factors for VTE include familial thrombophilia and acquired factors such as malignancies, previous VTE, reduced mobility, trauma or surgery, old age, pregnancy, heart failure, myocardial infarction, ischaemic stroke, obesity and use of oral contraceptives (4–6). Several of these risk factors represent inflammatory conditions (7). Emerging evidence suggests infection as a more important risk factor for VTE than previously recognized, and the coagulation system may play a major role in immune defence (8, 9). To better understand the pathophysiology of VTE and to identify improved diagnostic biomarkers for venous thrombosis, further studies on the relationship between inflammation and coagulation are needed (10). The term inflammation, derived from the Latin word inflammatio, is defined as a complex biological response of body tissues to harmful stimuli such as pathogens, damaged cells or irritants (9, 11–13). It is regarded as a protective response involving the innate and adaptive immune system, various blood cells, vessel wall, and a wide range of molecular mediators derived from the various cells involved in the inflammatory process. The main role of inflammation is to eliminate the initial cause of cell injury, to mediate clearance of necrotic cells and damaged tissues from the original insult and inflammatory process, and to initiate tissue repair. The classical local signs of inflammation are redness, heat, swelling, pain, and loss of function. In addition, severe inflammation also elicits systemic effects, probably mediated, at least in part, by circulating soluble mediators originating from the local inflammatory process.
The triad of increased coagluability, blood flow disturbance and vessel wall changes was postulated already by Rudolf Virchow (1821–1902) (14). However, increasing knowledge regarding the biological process bridging inflammation and coagulation have been established since Virchow's initial postulate. In this review we seek to further discuss the complex relationship between inflammation and VTE.
Pathophysiology of VTE
Endothelial cells are key regulators of the inflammatory response, as they: (i) form a physical barrier for blood cells and regulate the vascular permeability for immune cells, soluble proteins, electrolytes, and water; (ii) regulate the intravascular coagulation; (iii) regulate the vascular tone and blood pressure through initiation of vasoconstriction/vasodilatation; and finally (iv) release hormones and other soluble mediators, such as cytokines, that initiate and regulate the inflammatory process (15).
Endothelial cells activate, control, and direct leukocytes mainly through their cell surface expression of adhesion molecules and the release of chemotactic chemokines after activation. This enables immunocompetent cells to adhere to the endothelial cells and consequently cross the vessel wall by transendothelial migration (TEM), thus resulting in accumulation of immunocompetent cells at the inflammation site (16). Rapid endothelial activation (i.e., within minutes) is induced by stimuli like histamine and platelet-activating factor (PAF), initiating the expression of preformed adhesion molecules. In contrast, pro-inflammatory cytokines, such as interleukin (IL)-1β and Tumour Necrosis Factor (TNF)-α, induce a slower endothelial activation (i.e., within hours), involving transcriptional activation of adhering molecules and chemoattractants (16). The pathogenesis of VTE differs from that of arterial thrombosis, as venous thrombosis is initiated by intravascular events without exposure of the subendothelial structures (17). In a murine model of DVT inflamed endothelium increased the expression of a wide range of adhesion molecules that attach neutrophils and monocytes to the vessel wall, as an initial step in the formation of thrombus mainly consisting of leukocytes and few platelets (18). A complex interplay between monocytes, neutrophils, platelets, and the coagulation cascade leads to the formation of a thrombin-rich thrombus. Activated monocytes express TF that initiates the extrinsic pathway of the coagulation cascade. Thus, findings from the study suggest that TF expression by monocytes appears to be more important than endothelial expression of TF in triggering the coagulation cascade in DVT.
Both the leukocyte-endothelium and leukocyte-platelet interaction is a prerequisite for thrombosis initiation, shown in mouse-model studies of leukocyte integrin Mac-1, platelet C-type lectin-like receptor (CLEC-2), and vWF (19, 20, 21). Leukocyte integrin Mac-1 mediates adhesion of leukocytes-endothelium via the intracellular adhesion molecule-1 (ICAM-1), and adhesion of platelets via GPIbα, and targeting this adhesion-molecule could represent a possible therapeutic target (21). CLEC-2 is a receptor for podoplanin released from the endothelium during venous stenosis, and subsequently trigger thrombosis formation (20). CLEC-2 deficient mice are protected against thrombosis, and treatment of anti-podoplanin neutralizing antibodies reduces thrombosis size in animal models.
Moreover, neutropenia, genetic knockout of factor XII, and neutrophil extracellular traps (NETs) disintegration protected against the formation of DVT (22). This indicating neutrophil activation as a prerequisite for DVT formation, since neutrophils bind coagulation factor XII and release NETs, which together with platelets activate the coagulation cascade both through the intrinsic and extrinsic pathways (18). The host might prevent vascular occlusion through DNases that helps dissolve the NETs during an inflammatory response, thus control and prevent thrombus formation (23).
Soluble Mediators During Inflammation
Cytokines, adhesion molecules, and matrix metalloproteases (MMPs) are some of the key components involved in inflammation, see Figure 1 (12, 16, 24). Cytokines are important for cell-cell communication during inflammation, and they are highly heterogeneous and can be classified based on their function, structure, or based on their mechanism of action in the immune system, i.e., pro-inflammatory, anti-inflammatory or adaptive (12). The main pro-inflammatory cytokines belong to the IL-1, IL-6, IL-17, interferon, and TNF families. The IL-1 family is essential for initiation of the inflammatory cascade (25, 26), and cytokines in the IL-6 family have both immunoregulatory, as well as other systemic effects (27). The main anti-inflammatory cytokines include those in the IL-10 (28) and IL-12 families (29–32).
Figure 1. The figure present the main interactions between cytokines, chemokines, adhesion molecules, matric metalloproteases (MMPs), and coagulation activation involved in the pathophysiology during venous thrombosis development. Cytokines are early initiators of inflammation, ameliorating the interactions between leukocytes and endothelial cells. Activated leukocytes and endothelial cells express adhesion molecules which promotes leukocyte attachment to the endothelium which is important in the initiation and development of venous thrombosis. MMPs are involved in fibrosis of the vein walls modulation. In addition MMPs are important modulators of cytokines and adhesion molecules during inflammation as they can alter cytokines and contribute to adhesion molecule shedding.
Adhesion molecules are important mediators of cellular adhesion between leukocytes and endothelial cells and can exist in the membrane-bound as well as the biologically active soluble forms (16). The adhesion molecule family includes selectins (L-, E-, and P-selectins) and various immunoglobulin (Ig) family members [e.g., Vascular Cell Adhesion Molecule 1 (VCAM-1), ICAM-1/2]. E-selectin is expressed by endothelial cells, L-selectin by leukocytes, and P-selectin by endothelial cells and platelets, and they are all induced by pro-inflammatory mediators. Selectins are important for leukocyte rolling, and P-selectin is also involved in thrombus formation and intravascular coagulation during infection (9, 16). Ig family members are of particular importance in firm adhesion and trans-endothelial migration of leukocytes, and both ICAM-1 and VCAM-1 are expressed by endothelial cells (33).
Finally, MMPs have emerged not only as molecules involved in modelling extracellular tissue, but also as important regulators of inflammatory responses, e.g., through their activation and modulation of pro-inflammatory cytokines (24). Matrix metalloproteases (MMPs) and protease inhibitors both interact with cytokines and adhesion molecules at various levels. Hence, one may argue that these mediators should be regarded as functional parts of the cytokine network. MMPs are zinc-dependent enzymes belonging to the metzincin superfamily of zinc endopeptidases that, to date, comprise 24 mammalian proteases (24, 34, 35).
Cytokines and VTE
A range of risk factors for VTE include inflammatory conditions, gives rise to the hypothesis that elevated inflammatory mediators are risk factors for DVT and post thrombotic syndrome (PTS). Levels of several cytokines are found elevated as part of VTE pathobiology (Table 1), and findings from selected human and animal studies showing the importance of adhesion molecules in VTE are presented in Table 1.
Table 1. Cytokines as predisposing factors, diagnostic markers, and prognostic markers in venous thrombosis.
Cytokines in Inflammation and Predisposition to VTE
Single nucleotide polymorphisms (SNPs) affecting cytokine genes are associated with an increased risk, and others with a reduced risk, of VTE (Table 1) (4, 67, 36, 40, 39). IL-1 cytokines are early inflammatory mediators. SNPs in IL-1α and IL-1β have shown to be associated with reduced risk of DVT, while another SNP for IL-1β is associated with increased risk of DVT (38). IL-6 is an inflammatory mediator later in the cascade, and is maybe the most studied cytokine during inflammation. Also certain SNPs of IL-6 has been associated as a risk factor for VTE (36).
A number of small case-control studies demonstrated increased levels of pro-inflammatory, or decreased levels of anti-inflammatory, cytokines in patients at risk for DVT (61, 63, 45). Although in a larger, prospective population-based case-control study, no such associations were found (37).
Increased inflammation is also a common feature of most of the epidemiologically proven risk factors (70). As previously genetic factors affecting the coagulation system (e.g., factor V, Leiden, and prothrombin mutations) are predisposing risk factors for VTE (4, 41, 71, 72). However, family history in itself is an independent risk factor that could be more useful than genetic testing when assessing the risk for thrombosis (73). This indicates that genetic predispositions are multifactorial and a complex combinations of several genetic traits, in which inflammation could represent a part of the explanation.
Cytokines as Part of the Acute Reaction and Their Possible Diagnostic Use
Increased levels of pro-inflammatory cytokines were detected in animal models of acute venous thrombosis (74). Several inflammatory cytokines like IL-6, IL-8/CXCL-8, and TNF-α are increased during acute thrombosis, although with no evident diagnostic value (7, 40, 59, 47, 46, 49). The focus of most of the studies has been the main cytokines IL-1, IL-6, IL-8/CXCL-8, and IL-10. Increased inflammatory mediators during the clinical course of thrombosis are in line with clinical signs as redness and swelling. However, even broader inflammatory profiles have limited diagnostic value as most differential diagnoses also show extensive inflammatory activity (69).
Cytokines and Thrombus Resolution
Inflammation is considered as an essential response during venous thrombosis formation and resolution, and increased levels of inflammatory cytokines seem to have prognostic impact (56, 55, 53). IL-6 could represent a therapeutic target in the prevention of post-thrombotic syndrome, as suggested by a previous study using an animal model of DVT (54).
In conclusion, cytokines and play a role as predisposing factors for VTE, however they are not established as important risk factors. Elevated cytokines are found in several studies of VTE patients, although it is difficult to draw clear conclusion of causality of the cytokines role in venous thrombosis in these patient cohorts.
Adhesion Molecules and VTE
Adhesion molecules are part of the formation of the inflammatory response (Figure 1). The P-selectin stored in platelets and endothelial cells, has been proposed as a key molecule in thrombosis and haemostasis (75, 76). P-selectin has been found upregulated as early as 6 h after thrombus induction (77). The binding of P-selectin to its receptor P-selectin ligand-1(PSGL-1) present on the surface of leukocytes and platelets, initiates pro-coagulatory mechanisms (77, 78). Findings from selected human and animal studies showing the importance of adhesion molecules in DVT are presented in Table 2.
Table 2. Adhesion molecules as predisposing factors, diagnostic markers and prognostic markers in venous thrombosis.
Predisposing Factors for VTE
The gene for coagulation factor V is genetically closely linked to the genes encoding the selectins. In a study by Uitte de Willge et al. examination of the haplotypes of E-selectin and P-selectin demonstrated no association with DVT risk (79). Proctor et al. observed that serum P-selectin (sP-selectin) and IL-10 had a consistent association, during the first week after an injury, with the presence or absence of VTE. The sP-selectin level difference was not statistically significant between the groups. Those patients who developed VTE had a higher sP/IL-10 ratio, where lower levels of IL-10 accounted for the ratio-difference, statistically significant to those without VTE (61).
The Acute Phase Reaction and Diagnostic Use
Currently the biomarker used in VTE diagnostic is D-dimer, which is a non-specific biomarker of VTE, being a fibrin degradation product (76). sP-selectin has been a candidate as replacement of D-dimer as a diagnostic marker. An early study published in 2000 demonstrated increased sP-selectin levels in thrombosis patients (85). The two most promising studies demonstrated high positive predicative value (PPV) of 91/100%, and a specificity of 97.5/96% for establishing the diagnosis of DVT, with Wells score ≥ and sP-selectin ≥90 ng/ml (76, 78). The first study suggested that P-selectin may be both more specific and sensitive than D-dimer as a diagnostic marker at least in specific subsets of patients (78). The subsequent study also demonstrated higher specificity for sP-selectin, however D-dimer in combination with Well's score performed as well as sP-selectin combined with Well's score in ruling out DVT (76).
Changes in platelet expression of P-selectin may also be used as a diagnostic marker of susceptibility to DVT in high risk surgical procedures, demonstrated in a study of female patients undergoing a total knee arthroplasty (84). A small prospective study published in 2003 examined ICAM-1, VCAM-1, E-selectin, and P-selectin in the diagnostic of DVT, and no significant difference were found between the concentrations in patients with DVT vs. controls (82). Increased levels of E-selectin have also been found as an independent risk factor associated DVT in postoperative patients with abdominal malignancy (49), and VCAM levels seem to be higher in DVT patients (83).
Adhesion Molecules and Thrombus Resolution
Post-deep vein thrombosis venous insufficiency is characterized by vein wall fibrosis, and is central in the development of PTS, where the long term outcome is influenced by early resolution of the thrombus (80). The inflammatory response has been found to affect both thrombus resolution and PTS development (55, 77, 87). P-selectin and D-dimer have been found elevated in the acute phase of DVT, and decrease significantly during the first month (86). The recanalization is inversely related to coagulation markers and fibrinolytic inhibition (53). Increased levels of P-selectin may represent a hypercoagulable state, although it remains unclear if it precedes and promotes thrombosis or is a consequence of thrombosis (86). In patients with a more serve inflammatory response, the endogenic fibrinolysis is inhibited and coagulation stimulated and therefore thrombus resolution is delayed. This is demonstrated by an increased level of IL-6 and P-selectin in the chronic phase, indicating a worse prognosis (53). However, sP-selectin levels are higher 1 month after a thrombosis in patients who resolved their DVT, implying a more active thrombus metabolism in these patients compared to those with chronic thrombosis (80).
A cross-sectional study in a chronic phase after pregnancy-related DVT demonstrated higher levels of ICAM-1 and VCAM-1 in cases compared to controls. However, after univariate analyses these markers where not significantly associated with PTS (50). Though, patients who develop PTS appear to have higher ICAM-1 level then those patients who do not develop PTS (55).
P-selectin is strongly influenced by treatment of oral anticoagulation, illustrated by increased levels within few months after discontinuation of vitamin-K antagonists. Two rodent model studies showed that P-selectin inhibition decreases post DVT vein wall fibrosis (87, 88). It is assumed that the effect is associated with decreased profibrotic mediators, independent of changes in thrombus masses (87). A meta-analysis of non-human primate models confirmed a significant difference in the effect of vein-reopening and inflammation when comparing P-selectin antagonism and saline (78). Observations that thrombus formation and extension may be inhibited, and enhanced resolution when a DVT is treated with P-selectin antagonists highlight the importance of sP-selectin in thrombosis (75, 88).
In conclusion, adhesion molecules are vital for thrombus formation. P-selectin is a possible diagnostic marker for DVT, and might also represent a therapeutic target.
Matrix Metalloproteases and VTE
MMPs are important in inflammatory responses through their regulation of inflammatory mediators, as well as in maintenance of the function and integrity of physical barriers (Figure 1) (24). Animal models have suggested that MMPs are important effectors during VTE resolution and reduce vessel wall fibrosis (66, 90), thus indicating that MMPs represent potential therapeutic targets (54). Findings from selected human and animal studies showing the importance of MMPs in DVT are presented in Table 3.
Table 3. Matrix metalloproteases as predisposing factors, diagnostic markers and prognostic markers in venous thrombosis.
The Role of MMPs as Predisposing Factors for VTE
SNPs affecting MMP-9 and IL-6 have been evaluated as predisposing factors for DVT in cancer patients (39). When comparing healthy controls with cancer patients with DVT, both SNPs were associated to DVT. Distribution of the SNPs was similar between healthy controls and DVT negative cancer cases. The results indicate that the GG and CC genotypes, respectively for both SNPs, are associated with increased risk of DVT in cancer patients by inducing the release of IL-6 with subsequent increment of MMP-9.
MMPs in Acute VTE and Post Thrombotic Syndrome
Studying PTS, one study aimed to quantify the change in vein wall thickness in patients who failed to resolve DVT within 6 months, and whether differences in levels of inflammatory proteins associated with venous remodelling (80). Results demonstrated increased levels of MMP-9 antigen in thrombosed patients compared with controls. Other biomarkers such as D-dimer and P-selectin were higher in thrombosed patients at diagnosis, although not significantly different at 6 months. P-selectin gene expression were higher in leukocytes from patients with chronic DVT compared with those who resolved within 1 month after diagnosis.
In another study the expression of inflammatory biomarkers in the early phase of DVT and their correlation with the onset of PTS was evaluated (48). Samples were harvested from 201 patients after their first episode of DVT over a period for 18 months, and from 60 patients without DVT. Analyses of inflammatory biomarkers demonstrated high plasma levels of MMPs and cytokines during the acute phase after DVT. Patients with PTS demonstrated higher levels of MMP-1 and MMP-8 than patients without PTS, implying a close relationship between DVT, the individual risk of PTS and specific biomarkers such as MMPs.
In conclusion, few studies exploring the role of MMPs in VTE are performed. MMPs are elevated during VTE and PTS, although also during other inflammatory conditions, and so far not proven value as diagnostic markers (69).
Conclusions and Future Perspective
Inflammatory mediators are part of several cascades in the pathophysiology of VTE; predisposing factors, initiation and prolongation of acute thrombosis and resolution. Especially cytokines have been implicated as a predisposing factor in several studies, while adhesion molecules and MMPs are to a lesser degree studied (Tables 1–3). High quality studies demonstrating the effect of inflammatory mediators as predisposing factors of thrombosis are difficult to design. However, the performed studies combined with the knowledge that most risk factors of VTE involves inflammation, indicate an important role of inflammatory mediators as risk factors for thrombosis. The complexity of the genetic predisposition of most human disease hampers to decipher the exact impact of different genetic and environmental factors (91). The focus on family history instead of genetic analysis in clinical assessment is a reasonable approach given this genetic complexity (73, 92). Until further studies have given utterly information, genetic tests involving inflammatory mediators should not be part of routine clinical practice (92).
Several case-control studies and selected animal studies clearly demonstrate the role of the inflammatory response in VTE (Tables 1–3). Despite this, few inflammatory mediators have shown utility in diagnostics compared with traditional biomarkers; D-dimer and CRP being the most important ones. The only inflammatory marker shown almost as helpful as D-dimer in diagnostic work up is sP-selectin, although has so far not proven to add definitive diagnostic value. As prognostic factors, the studies presented in Tables 1–3 are indicating higher inflammatory mediator levels can be used to identify patients of risk of PTS. Larger thrombotic burden is a reasonable explanation of these finding.
The intertwined effect of inflammation and coagulation is an important aspect of treatment of VTE. Inflammation as a target is responsible for parts of the effects of low molecular heparin as it is reducing TNF-α expression (93). Furthermore, statins have anti-inflammatory effects believed to be favourable for thrombosis resolution (94–97). Other modulations of the inflammatory response are explored in animal models as possible treatments. Increased levels of cytokines such as IL-8, CCL2 are favourable for thrombus resolution (98, 99), and impaired inflammatory response by cytokine receptor deletion or neutropenia also reduces thrombus resolution (100, 101). This leads to the assumption that the inflammatory response is a prerequisite not only for the thrombus formation, but also the resolution, although the results from using cytokine stimulation are conflicting (102). However, the resolution is also dependent on the leukocytes as neutropenia seems to reduce the capability for thrombus resolution (87).
Future research, both basic laboratory research including studies in murine models, in addition to translational and clinical research, are important to completely bridging the association between inflammation and VTE. This includes a better understanding of the inflammatory aspects of thrombosis and the pathophysiology role of mediator molecules, herein their potential role as diagnostic and prognostic biomarkers. The later will be of special interest for selective patient groups, there biomarkers have demonstrated to be of limited values, including patients with malignant disease and patients with other inflammatory comorbidities. Until then, good clinical judgments combined with established biomarkers and radiological examinations, are still the basic tools in diagnostic approaches for patients with VTE.
KM: main responsibility for writing; SJ: responsibility for writing of the parts regarding Adhesion Molecules; ØW: responsibility for writing of the parts regarding Matrix Metalloproteases; IN: introduction and illustrations; ØB: main Idea of the publication; HR: corresponding author.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
The manuscript is partly based on the Thesis Cytokine profiles in inflammation, by KM, published at the University of Bergen in 2017.
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Keywords: venous thrombosis, inflammation, cytokines, adhesion molecules, matrix metalloproteases
Citation: Mosevoll KA, Johansen S, Wendelbo Ø, Nepstad I, Bruserud Ø and Reikvam H (2018) Cytokines, Adhesion Molecules, and Matrix Metalloproteases as Predisposing, Diagnostic, and Prognostic Factors in Venous Thrombosis. Front. Med. 5:147. doi: 10.3389/fmed.2018.00147
Received: 02 February 2018; Accepted: 30 April 2018;
Published: 22 May 2018.
Edited by:Ana Kasirer-Friede, University of California, San Diego, United States
Reviewed by:Coen Maas, University Medical Center Utrecht, Netherlands
Jonas Emsley, University of Nottingham, United Kingdom
Copyright © 2018 Mosevoll, Johansen, Wendelbo, Nepstad, Bruserud and Reikvam. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Håkon Reikvam, email@example.com