Neuro-Immune Hemostasis: Homeostasis and Diseases in the Central Nervous System

Abstract

Coagulation and the immune system interact in several physiological and pathological conditions, including tissue repair, host defense, and homeostatic maintenance. This network plays a key role in diseases of the central nervous system (CNS) by involving several cells (CNS resident cells, platelets, endothelium, and leukocytes) and molecular pathways (protease activity, complement factors, platelet granule content). Endothelial damage prompts platelet activation and the coagulation cascade as the first physiological step to support the rescue of damaged tissues, a flawed rescuing system ultimately producing neuroinflammation. Leukocytes, platelets, and endothelial cells are sensitive to the damage and indeed can release or respond to chemokines and cytokines (platelet factor 4, CXCL4, TNF, interleukins), and growth factors (including platelet-derived growth factor, vascular endothelial growth factor, and brain-derived neurotrophic factor) with platelet activation, change in capillary permeability, migration or differentiation of leukocytes. Thrombin, plasmin, activated complement factors and matrix metalloproteinase-1 (MMP-1), furthermore, activate intracellular transduction through complement or protease-activated receptors. Impairment of the neuro-immune hemostasis network induces acute or chronic CNS pathologies related to the neurovascular unit, either directly or by the systemic activation of its main steps. Neurons, glial cells (astrocytes and microglia) and the extracellular matrix play a crucial function in a “tetrapartite” synaptic model. Taking into account the neurovascular unit, in this review we thoroughly analyzed the influence of neuro-immune hemostasis on these five elements acting as a functional unit (“pentapartite” synapse) in the adaptive and maladaptive plasticity and discuss the relevance of these events in inflammatory, cerebrovascular, Alzheimer, neoplastic and psychiatric diseases. Finally, based on the solid reviewed data, we hypothesize a model of neuro-immune hemostatic network based on protein–protein interactions. In addition, we propose that, to better understand and favor the maintenance of adaptive plasticity, it would be useful to construct predictive molecular models, able to enlighten the regulating logic of the complex molecular network, which belongs to different cellular domains. A modeling approach would help to define how nodes of the network interact with basic cellular functions, such as mitochondrial metabolism, autophagy or apoptosis. It is expected that dynamic systems biology models might help to elucidate the fine structure of molecular events generated by blood coagulation and neuro-immune responses in several CNS diseases, thereby opening the way to more effective treatments.

Introduction

The complex and dynamic biological process of healing following an injury is linked to the activation of coagulation and of the immune system (Mancuso and Santagostino, 2017; Wang et al., 2017). Indeed, reparative processes can functionally restore endothelial integrity after a damage (infectious, post-traumatic, shear stress-induced, or metabolic-related) and hereafter activate the immune system (Nurden, 2011; Mancuso and Santagostino, 2017). Activation of these integrated processes relies upon cellular components and circulating factors that are crucial to stimulate physiological repair and tissue rearrangement, and essential to the homeostasis of central nervous system (CNS) (De Luca et al., 2017).

The paramount step to secure the integrity of the system is the scouting of the endothelial damage and the clot formation. The coagulation players have been divided into cellular and protease components, the latter playing into three pathways: intrinsic, extrinsic, and common (McMichael, 2012). In this review the clotting factors will be addressed with Roman numbers, with the post-position of the letter “a” to indicate the activated factor (Giangrande, 2003) except for the FI-IV that will be addressed as fibrinogen, prothrombin, tissue factors (TFs) and Calcium (Ca²⁺) (Table 1).

The explorers of damage are FVII (described as the extrinsic pathway initiator), the only human factor circulating as both FVII and FVIIa to monitor TF exposure, and FXII (the intrinsic pathway initiator), whose activation is induced by subendothelial collagen in the presence of high-molecular-weight kininogen (HMWK). The TF-FVIIa complex activates FIX and FX, while FXIIa activates FXI, which also leads to FIXa. FXa indeed converts low levels of prothrombin in thrombin (Tanaka et al., 2009). Briefly, low concentration of thrombin and FXa are the scouting signals that can either trigger the amplification or be neutralized by the surrounding healthy cells.

Platelet are then activated with the formation of pseudopodia that allow covering the injury site and the release of granular (α and δ granules) mediators (Mancuso and Santagostino, 2017). In fact, once the damage has been localized, degranulation of α-granules exposes P-selectin, activates integrin αIIbβ3, promotes circulating immune cells adhesion and releases fibrinogen, VWF, FV and more than 300 proteins, including chemokines (Bahou, 2013) and growth factors, such as platelet-derived growth factor (PDGF), brain-derived neurotrophic factor (BDNF), fibroblast growth factor (FGF), and the vascular endothelial growth factor (VEGF) (Nurden, 2011; Chen et al., 2018). P-selectin, also known as Cluster of Differentiation (CD)62P, and glycoprotein (GP)Ib on platelets are respectively recognized on white cells by P-selectin glycoprotein ligand 1 (PSGL1) and αMβ2 integrin CD11b/CD18, also known as Macrophage-1 antigen (Mac-1) or CR3, the latter able to bind also complement, fibrinogen and platelet GPIIb-IIIa (Nurden, 2011; Mancuso and Santagostino, 2017). Chemokines, or chemotactic cytokines, are classified into families according to the arrangement of the cysteine residues that constitutes the disulfide bridges, namely CXCL, CC, CX3C, XC (Zlotnik and Yoshie, 2000, 2012). Among chemokines, platelet factor 4 (PF4, also known as CXCL4), CXCL1, interleukin-8 (IL-8) (Bahou, 2013) and CXCL7 are absolutely the most abundant, the latter used as a marker of megakaryocytic lineage. However, several other molecules (CCL5, CXCL5, CXCL12) have been recognized, and there is evidence of distinct and specialized α-granules subclasses containing subsets of chemokines specifically released under certain pathophysiological conditions (Italiano et al., 2008; van Nispen tot Pannerden et al., 2010).

The δ granules (or dense granules) release bioactive amines (e.g., histamine and serotonin), adenine nucleotides (ADP, ATP, and cAMP), poly- and pyrophosphates, and high concentrations of cations, above all Ca²⁺ (Bahou, 2013). A high local concentration of FXa and thrombin ends the amplification phase and induces its propagation and the last proteolytic cleavage that involves fibrinogen, which is then transformed into fibrin and stabilized by the transglutaminase FXIIIa. Plasminogen, activated by tissue-type plasminogen activator (tPA) into the protease plasmin, can ultimately disassemble the fibrin aggregates (Muszbek et al., 2011). Moreover, thrombin on the intact vessel wall can inhibit itself: it binds to thrombomodulin and cleaves Protein C (PC) into its activated form (aPC) which, together with Protein S and TFPI, inactivates FVa, FVIIIa and inhibits FXa, thus limiting and quenching the process (Peraramelli et al., 2012; Mosnier et al., 2014).

Moreover, on cell surface thrombin can trigger the complement cascade (Hamad et al., 2010). Activated complement receptor (CR)2 is present on resting platelets expressing GPIb, as well as the iC3b binding on CR3, while C3a, C5a (the so-called anaphylatoxin) and C4a are bound on human platelets (Cosgrove et al., 1987). However, to inhibit spontaneous aggregation and membrane attack complex (MAC) formation, it is pivotal the expression of Factor H (FH) and thrombospondin type 1 (TSP-1) (Mnjoyan et al., 2008). The important regulation of this system has been demonstrated, for example, in the atypical hemolytic uremic syndrome (aHUS), where the deficit of FH (genetic or acquired) causes the triad: anemia, thrombocytopenia, and uremia (due to acute renal failure) (Kavanagh et al., 2013).

Neuro-Immune Hemostasis and Neuroinflammation

The complexity of the neuro-immune system interaction starts at the level of the neurovascular unit. This structure is composed by the blood–brain barrier (BBB) elements (endothelial cells, pericytes and the astrocytic foot endings) on the one side, and neurons, glia and extracellular matrix (ECM) on the other side (Muoio et al., 2014). All together, these elements (neurons, glia, and ECM) constitute what has been well-described as the tetrapartite synapse (Dityatev and Rusakov, 2011; Tsilibary et al., 2014; De Luca and Papa, 2016, 2017).

This complex structure accounts for the immune privileged properties of the brain and of the spinal cord (which has its own blood–barrier BSCB) (Bartanusz et al., 2011). The efficacy of the barrier is based on the innate immune properties of resident cells (neurons and glia), which interact with pathogens, endogenous (e.g., unfolded or misfolded proteins) or exogenous toxins, to maximize the adaptive response and to reduce the collateral damage (Medzhitov et al., 2012; Lampron et al., 2013). The resiliency of the system strictly depends on a variety of proteins that have been grouped for their functional role of neuro-immune regulators (NIReg) and are expressed on both glial cells and neurons (Bedoui et al., 2018).

NIReg are constitutively expressed on neurons and acts as “Don’t eat me” signals for microglial cells that are maintained in a resting state (such as the CD200, CD47, and CXCL1), or they negatively regulate complement activation (CD59, CD46, FH) (Bedoui et al., 2018) (Figures 1, 2). Moreover, resident cells are able to repress deregulated cytokine activation through the expression of Suppressor Of Cytokine Signaling (SOCS) that interferes with the inflammatory-related activation of the JAnus-Kinase (JAK)/Signal Transducer and Activator of Transcription (STAT) intracellular polarizing pathway (Bedoui et al., 2018).

FIGURE 1

Thrombin, a crucial protein in this network, has been reported to affect the behavior of CNS resident cells, such as neurons (Olianas et al., 2007), astrocytes and microglia (Lin et al., 2013; Beggs and Salter, 2016) in a dose dependent manner, with adaptive changes at low dose and maladaptive modifications at high concentration.

Of relevance for thrombin interaction with CNS resident cells, endothelium, and immune cells, is the proteinase activated receptor (PAR) family, G protein coupled receptors (GPCR)s with four recognized members (PAR1-4). PARs can be activated by a proteolytic cleavage of the extracellular amino-terminal domain of their seven-transmembrane α-helix structure (Junge et al., 2004; Wang et al., 2004; Luo et al., 2007; Traynelis and Trejo, 2007; Vance et al., 2015). Thrombin (not complexed with thrombomodulin), FXa, plasmin, and matrix metalloproteinases-1 (MMP-1) canonically activate PAR1 on cell surface, unmasking the tethered ligand with a proteolytic cleavage and causing its internalization (Ye et al., 1994; Wittinghofer and Vetter, 2011). Thrombin can alter neuronal viability through PAR-1 interaction, since thrombin antagonists and pharmacological/genetic PAR-1 inhibitors increase neuroprotection (Rajput et al., 2014). PAR2, instead, can be activated by low-concentration of trypsin. PAR3 is the only PAR with no function because of its short cytoplasmic domain (Coughlin, 2005). Indeed, it can act as a cofactor for other PARs to form heterodimers and amplify the variety of intracellular transduction systems (Arachiche et al., 2013; Lin and Trejo, 2013), perhaps by allosteric modification and interaction with different G proteins (Gαq/11, Gαi/o, Gα12/13) (Ossovskaya and Bunnett, 2004; McLaughlin et al., 2005). Non-canonical cleavage by aPC also activates PAR1 (biased agonism) and trigger a different intracellular pathway (Figure 1). The aPC binds to the coreceptor endothelial PC receptor (EPCR) and cleaves PAR1 (Riewald and Ruf, 2005), but does not induce its internalization as being co-localized in caveolin-rich membrane domains (Russo et al., 2009). Canonical-cleavage activates Guanosine-triphosphatase (GTPase) rat-sarcoma protein (Ras)-related protein-A (RhoA), while non-canonical cleavage (aPC-mediated) stimulates GTPase Ras-related C3-botulinum toxin substrate-1 (Rac1) through β arrestin (βarr2) and disheveled 2 (Dvl-2), usually associated to frizzled receptors (FZD) (Russo et al., 2009; Soh and Trejo, 2011). Moreover, C4a has been proposed as an untethered agonist for PAR1 and PAR4 acting through Gαq-Phospholipase C (PLC) pathway that within nanomolar concentrations can cause intracellular Ca²⁺ release (Wang et al., 2017) (Figure 1).

NIReg also include serpins and thrombomodulin, which are able to reduce the potential neurotoxicity of thrombin, mainly mediated through tethered ligand activation of PAR1 signaling (Buisson et al., 1998; Niego et al., 2011) (Figure 1). The lipopolysaccharide (LPS), furthermore, stimulates the expression of coagulation and inflammation factors in the hippocampal microglia, but a sharp reduction of both inflammatory and coagulation factors occurs when the thrombin-mediated signal is inhibited (Shavit Stein et al., 2018).

Definitely, based on relevance of the neurovascular unit in modulating neuro-immune hemostasis and neuroinflammation, we propose that the neurovascular complex can be associated with the tetrapartite synapse to form an ultimately unified pentapartite synaptic model (Figure 2). This model might better represent the complex and robust interplay between cellular and molecular pathways of coagulation and the immune system, as reported by in vitro or in vivo studies (Thornton et al., 2010; Barbier et al., 2011). The analysis of the state of the art in this field can partly reveal the pathophysiology of neuro-inflammatory and neurodegenerative diseases, such as multiple sclerosis (MS), cerebrovascular, Alzheimer, neoplastic and psychiatric diseases.

Multiple Sclerosis

Multiple sclerosis is a demyelinating autoimmune inflammatory disease affecting the CNS white matter. It lacks a commonly recognized causative agent (idiopathic), and the multifactorial interactions between environment and genetics are not fully elucidated (Sawcer et al., 2014; Belbasis et al., 2015). Though the pathophysiology of MS remains unknown, there is morphological evidence of its inflammatory origin and of the resulting neurodegeneration, moreover, therapies targeting the inflammasome modify the progression of the disease (mainly the relapsing-remitting phenotype) (Dahdaleh et al., 2017).

On the base of the clinical observation and the progression, MS can be classified into two forms, relapsing-remitting and progressive (primary or secondary) (Lublin and Reingold, 1996). Inflammation with relatively preserved cell viability seems to be the hallmark of relapsing-remitting early stages, is characterized by clinical features that can affect the motor system (particularly the pyramidal tract) or non-motor areas, depending on which part of the CNS is affected by the demyelination. Every relapse is followed by a spontaneous partial remission, ameliorated by early therapy (Lublin and Reingold, 1996), while the progressive forms, either the primary or the evolution of the initially relapsing-remitting MS (secondary), are characterized by a continuous neurodegeneration with almost ineffective therapy on its progression (Lublin and Reingold, 1996; Feinstein et al., 2015).

Which is the key to understand the failure of the immune system has been long debated. Inflammatory autoimmunity, defined “horror autotoxicus” by Paul Ehrlich over a century ago (Ehrlich, 1900), starts with the erroneous recognition of an endogenous target as a threat, with the activation of resident cells that present it to the immunity effectors. As discussed above, the neurovascular unit should prevent inappropriate migration of leukocytes from the bloodstream and protect the CNS. The Trojan horse that could cause the BBB failure and allow the specific T-cells diapedesis has not been identified yet, but a putative role could be assigned to platelets activation and fibrin depots in the CNS and other tissues (Hultman et al., 2014; Joshi et al., 2016). These cellular and protein aggregates can be produced by a minimal vascular damage or venous stasis, and their pathological accumulation could produce a non-diffusible and localized signal to mediate lymphocyte T helper (Th)1 migration and myelin targeting (Ryu et al., 2015). This hypothesis is supported by the evidence of the occurrence of fibrinogen in myelinated areas that correlates with T-cells invasion and IL-12 mediated Th1 differentiation, macrophage activation through CCL2 and CXCL10 and following demyelination (Lodygin et al., 2013). Antibodies directed to GPIb or GPIIb-IIIa reduce the severity of the disease in an animal model, whereas increased integrin αIIb gene (ITGA2B) mRNA has been found in chronic lesions of MS patients (Lock et al., 2002; Langer et al., 2012). Furthermore, in the autoimmune encephalomyelitis model (EAE) it has been shown that depletion of fibrinogen blocks T-cell activation, accelerating the coagulopathy-mediated pathway (Akassoglou et al., 2004), where the presence of fibrin or platelets are the erroneous triggering signal, allowing antigen presenting cells to interact with lymphocytes and delete the immune privilege property of the CNS (Lodygin et al., 2013). Thrombin, in addition, can speed the process between platelet activation and fibrin deposition (Figure 1) favoring the formation of aggregates, and drive the leukocytes through release of granular CCL3, CCL5, PF4 (CXCL4), and CXCL5 (Raphael et al., 2015).

Platelet activation is associated with clinically assessed worsening of MS, as demonstrated by the positive correlation between the Expanded Disability Status Scale (EDSS) and the level of Cyclooxygenase (COX)-1 activity, and the levels of the eicosanoid thromboxane B2 (TBX2) in blood platelets of MS patients (Morel et al., 2016). Furthermore, mediators from platelet granules include growth factors (i.e., BDNF) and chemokines involved, together with MMPs, in both hemostasis and inflammatory progression (Morrell et al., 2014). Hence, the initial vascular damage activates platelets and converts fibrinogen. Platelets phenotype, at this point, is characterized by low selectin expression and low-rate degranulation. The granule content (PF4, serotonin, chemokines, cytokines, ADP, ATP, etc.) is released more efficiently upon contact with astrocytes, neuronal glycolipids and ECM (Sotnikov et al., 2013) (Figure 2). The acute inflammatory response is not produced only by the active degranulation; the expression of other proteins is needed to activate the inflammasome. One of the main proteins involved, and utterly the most studied, is Interleukin-1β (IL-1β) synthesized on demand from a messenger RNA stored inside platelets. IL-1β is secreted and found in occlusive thrombi after vascular damage (before leukocyte incorporation) (Mancuso and Santagostino, 2017). Moreover, the corresponding receptor (IL1R) is expressed on the platelet surface, allowing an autocrine self-sustaining feedback (Brown et al., 2013). Tumor necrosis factor-α (TNF-α) also seems to be influenced by platelets activation, since its depletion significantly reduces white cells diapedesis during TNFα-mediated CNS phlogosis (Carvalho-Tavares et al., 2000). TNF-α can induce cellular apoptosis or contribute to chemokine generation and neurodegeneration through necroptosis (Dhuriya and Sharma, 2018).

FIGURE 2

This unregulated process induces BBB leakage, antigen presentation, activation of CD4 positive T-cells and their differentiation into Th1 or Th17 (Starossom et al., 2015). During later stages, the process is self-sustaining and platelets change their phenotype, express a higher level of selectins and adhere to T-cells or to antigen presenting cells, forming aggregates (Starossom et al., 2015).

The pivotal role of the molecular components of the coagulation cascade is confirmed by the protective action in the EAE model exerted by the administration of both warfarin and the non-vitamin K antagonist oral anticoagulant (NOAC) rivaroxaban (direct inhibitor of FXa) (Stolz et al., 2017). Thrombin can interrupt BBB integrity through PAR1 signaling; however, warfarin effect seems to be greater than rivaroxaban, probably resulting for the interactions with other proteins of the coagulation pathway, such as FVII (Coughlin, 2000, 2005). The lysis of fibrin, furthermore, should inhibit microglia activation via CD11b (part of CR3, encoded by ITGAM gene) and produce a similar beneficial effect in the EAE model without the possible detrimental side effect of warfarin due to the inhibition of the aPC endothelial protective functions (Adams et al., 2007; Sarangi et al., 2010). The protective role of aPC, however, is not a linear process; it has been shown that the anticoagulant and the intracellular signaling function of aPC are both essential to exert neuroprotection. However, both the inhibition of the endogenous aPC and the administration of exogenous aPC ameliorated the EAE outcome (Alabanza et al., 2013). This seems apparently controversial, but it can be explained because reduced endogenous aPC can induce early leukocyte infiltration due to BBB instability; at the same time, it increases CD11b positive elements, interfering with T-cells differentiation, thus reducing disease progression (Alabanza et al., 2013). Reduction of aPC is effective only if it is induced before the disease onset (Alabanza et al., 2013).

As the aforementioned CD11b positive elements confirm, the complement system pathway is a prominent component of the immune response and is entirely involved in inflammatory autoimmune disease at various levels. The system plays a pivotal role in essentially all immune-mediated processes, and it made difficult, although intriguing, designing drugs targeting its components. Complement proteins can act through three main activation pathway: classical, lectin and alternative pathway, all at the end forming the MAC complex with the elimination of target cells (Horstman et al., 2011). A coding variant in the C3 gene (C3R102G) reduced C3 activity and affected white/gray matter damage that is related to increased cognitive dysfunction in MS patients (Roostaei et al., 2018). Detrimental effects of complement interference can be overcome through inhibition at the lower level of complement activation cascade (e.g., C5). This strategy may reduce detrimental inflammation without affecting previous signaling steps. Hence, Eculizumab an inhibitor of C5, already approved for treatment of the paroxysmal—nocturnal hemoglobinuria (PNH), and of the aHUS (Marti-Carvajal et al., 2014; Cofiell et al., 2015) is undergoing phase III clinical trial for another autoimmune demyelinating disease of the CNS, the neuromyelitis optica (NMO) either for prevention or relapses forms¹. NMO with dominant involvement of optic nerves and spinal cord has been previously considered as a variant of MS. Nowadays, it is considered a distinct disease (Trebst et al., 2014) and even though it can lead to a more early disability, there are few approved therapeutic protocols (Trebst et al., 2014). Furthermore, human post-mortem study has demonstrated that neurons from patients with progressive MS express a higher level of PAR1 and are exposed to granzyme B and IL-1β, inflammatory mediators that could at least partially explain by their neurotoxic effect the progressive related cortical atrophy (Lee et al., 2017).

Cerebrovascular Diseases

The link between coagulation and cerebrovascular diseases seems causative, however, recent findings confirm the pivotal role of the coagulation/immune pathways during the plastic remodeling following or associated to the acute event. After an ischemic and hemorrhagic stroke, cortical synaptic remodeling is largely biased by a maladaptive response accounting for about 10% of epileptic seizures in elder (Maggio et al., 2008; Procaccianti et al., 2012; Guth et al., 2014). Moreover, the efficacy of thrombolysis and the current guidelines for the management of acute ischemic stroke (AIS) have rapidly reduced the acute mortality rate. Nowadays, the main social burdens and future challenges concern prolonged hospitalization, ineffective rehabilitation program, disability, and the epileptic sequelae (Szaflarski et al., 2008; Burneo et al., 2010; Tsivgoulis et al., 2014; GBD, 2016). Studies on human platelet activation focused on platelet ultrastructure and plasma levels of PF4, thrombin–antithrombin complex, fibrinogen and other biomarkers in patients with AIS, and during the chronic phase or with atherosclerosis (without stroke) compared to healthy subjects (Kurabayashi et al., 2000). Data are compatible with platelet pre-activation in atherosclerotic patients, similar but lower compared to patients with AIS or chronic phase. Pre-activated platelets showed a higher density of pseudopods and vacuoles (Kurabayashi et al., 2000, 2010). The endothelial damage reported in atherosclerosis, combined with a pre-activated state of platelets, is the most plausible factor for inflammatory-mediated CNS damage that accelerates the major hypoxic injury.

Astrocytes and other glial cells play a key role in the rearrangement of the neurovascular unit. They react to inflammatory stimuli by expressing chemokines (CXC and CC type) (García-Berrocoso et al., 2014). The CCL20, expressed only by astrocytic cells, is essential for the recruitment of white cells to the CNS (Ambrosini et al., 2003). The concentration of CCL22 is reduced in the damaged brain tissue and in the bloodstream following AIS and is associated with poor stroke outcome (García-Berrocoso et al., 2014). The CCL22 receptor CCR4, expressed on Th2 cells can shift the inflammatory response toward an adaptive deregulation, suppressing Th1-polarized response. This is supportive for a protective immune response, initiated during the acute ischemic event and lasting for some time (Theodorou et al., 2008). Microglia express C1q during transient ischemic attack and deposits of C3d and C9 have been reported on neuronal cells after traumatic concussion (Pasinetti et al., 1992; Schafer et al., 2000; Schultz et al., 2005). Depletion of the complement factor, C1q deficiency, and C1-inhibitor expression (Figure 1) are neuroprotective too, improving blood flow and neurological recovery after transient ischemia, and reducing the intracerebral edema following hemorrhage (Vasthare et al., 1998; Xi et al., 2001; Ten et al., 2005).

According to these data, complement levels in the cerebrospinal fluid (CSF) are elevated following AIS and correlate with BBB failure. C1q, C3b, and C3d have been found close to the ischemic penumbra (Lindsberg et al., 1996; Pedersen et al., 2004; Schultz et al., 2005). All these data show the putative role of complement activation in tissue recovering after AIS, thus offering new perspectives on the role of complement during the postictal plastic reorganization.

Thrombin effects depend on its concentration: the increase produces an adaptive-maladaptive gradient (Maggio et al., 2013c; Becker et al., 2014; Ben Shimon et al., 2015; Bushi et al., 2015; Garcia et al., 2015). Following AIS in the surrounding non-ischemic tissue, thrombin concentration is high; this could influences the recovery in the ischemic penumbra. In the PAR1 null animal model, a reduction of the ischemic area and repair in the postictal phase has been reported (Hamill et al., 2009). Drug inhibition of PAR1, or its knockdown, restores the impaired synaptic plasticity and neurotransmission in hippocampal slices exposed to oxygen and glucose deprivation (OGD) (Stein et al., 2015). Thrombin is produced in the brain and its concentration alters the homeostatic behavior in both pathology and physiology (Ben Shimon et al., 2015). In OGD and transient medial cerebral artery occlusion (TMCAO) models, the levels of endogenous thrombin and FX are elevated; this affects synaptic function and alters the coagulation process (Bushi et al., 2015; Lenz et al., 2015; Stein et al., 2015). Thrombin in the perilesional area can be derived by the brain tissue itself or by the bloodstream following to BBB failure. However, how endogenous thrombin is involved in the AIS or ischemic chronic phase remains not completely understood.

One hypothesis is that impairment of inhibitory neurotransmission by γ-aminobutyric acid (GABA), or by increased paired-pulse facilitation (PPF) also known as neural facilitation, would partially account for post-ischemic epileptic seizure (Maggio et al., 2008, 2013a,b; Ben Shimon et al., 2015). PPF is reduced by the administration of PAR1 antagonist or diazepam (GABAergic drug) (Bushi et al., 2015). PAR1 receptor sensitivity to different G proteins activation in different brain areas (or PAR1 partial activation) could be a good premise to explain the thrombin-dose related effects (McCoy et al., 2012; Maggio et al., 2013b). Hence, thrombin should be considered at least one of the triggers of the stroke-dependent seizures. This is a real perspective to pursue a therapeutical PAR1 inhibitory approach to treat epilepsy, not necessarily related to stroke. In the paradigm of PAR1 partial activation, a potential target is aPC; it efficiently interferes with inflammation, by promoting vascular integrity and sustaining the neuronal cells viability, thus improving the post-ischemic outcome (Cheng et al., 2003). We previously reported that BBB stability and endothelium integrity are mediated by aPC and PAR1 pathway (De Luca et al., 2017); furthermore, the aPC improves synaptic plasticity during rehabilitation, probably through EPCR/PAR1/Sphingosine1-phosphate receptor1 (S1P1R) intracellular activation (Maggio et al., 2014). S1P1R modulation with FTY720 (Fingolimod) receptor agonist, or with a novel more specific receptor agonist (RP101075) have shown to improve the clinical outcome of AIS and intracerebral hemorrhage (ICH) in animal models (Liu et al., 2013; Sun et al., 2016). Fingolimod, being approved as treatment for MS (for its immunosuppressive properties) reduce the capability of lymphocyte infiltration of CNS, reduce perilesional edema, preserve the neurovascular unit and polarize microglia toward the attenuated neuroinflammatory polarization through the STAT3 pathway (Sun et al., 2016; Qin et al., 2017).

A recent phase 2 clinical trial with Fingolimod in AIS has been completed²and another trial combinating Fingolimod with Alteplase bridging with Mechanical Thrombectomy in Acute Ischemic Stroke (FAMTAIS) is ongoing³. Whether this mechanism involves neurons or astrocytes PAR response is still debated, however, the co-localization of EPCR and PAR1 in specific brain areas (as hypothesized), mainly in the hippocampus, has been shown (Maggio et al., 2014). These reported data suggest that developing S1P1R agonists and thrombin inhibitors acting on PAR1 specific signaling, combined with the progress of thrombolytic therapies (or mechanical thrombectomy), will reduce both AIS lethality and post-ischemic hospitalization. Indeed, it is compelling to define the pathophysiology underlying the reparative processes of ischemic tissues and the perilesional area, having special attention to the neuro-immune coagulation pathways.

Alzheimer’s Disease

Alzheimer’s disease (AD) is a degenerative, gradually progressive, irreversible form of cognitive degeneration, recognized as the most diffused type of dementia (Reiman, 2014), and responsible for up to 60–80% of an estimated population (in 2010) of 35.6 million people worldwide affected by cognitive decay (Reitz et al., 2011; Mayeux and Stern, 2012). Gaetano Perusini and Alois Alzheimer firstly described AD at the beginning of the 20th century (Macchi et al., 1997) with their studies on AD anatomopathological hallmarks represented by amyloid-β (Aβ) plaques and neurofibrillary tangles (aggregates of hyperphosphorylated tau protein), cortical atrophy and gliosis (Papa et al., 2014; Reiman, 2014). The classical phenotype of AD is called hippocampal type and is characterized by progressive and disabling loss of memory function, with an amnestic syndrome selectively compromising episodic memory during early stages (Dubois et al., 2014). AD variant phenotypes include diseases affecting primary cognitive function other than memory, with apraxia, loss of visual identification or aphasia (respectively biparietal, occipitotemporal, or logopenic variant) (Dubois et al., 2014). Advanced neuroimaging or biomarkers (mostly in the CSF) based on Aβ or tau proteins and genetic profiling searching for causative mutations of presenilin1/2 or amyloid-precursor protein (APP) and risk factors such as apolipoprotein-E ε4 allelic variant now facilitate clinical diagnosis (Dubois et al., 2014). We need to find, as Perusini speculated, “[…] a noxious agent, which causes the whole disease, also acts on the blood vessels or equally damages both the neuron and the blood vessels” (Macchi et al., 1997).

Platelets are pivotal and pleiotropic in the regulation of inflammation and repair processes. In AD they might play a role in the proteolytic processing of APP by carrying a disintegrin and metalloproteinase (ADAM)17 (Skovronsky et al., 2001; Evin et al., 2003) or by favoring the complement cascade initiation. ADAM family proteins are transmembrane proteases that can perform the so-called α-cleavage on APP (Siegenthaler et al., 2016). A-cleavage prevents Aβ formation by inhibiting APP sequential cleavage by an aspartyl protease called BACE1 (β site APP cleaving enzyme 1) and by the γ-secretase with the following release of amyloid peptides of different lengths and aptitude for plaque formation (Aβ-38, Aβ-40, Aβ-42) (Siegenthaler et al., 2016). The link between AD and complement proteins has been proposed after the deposition of C proteins was shown inside Aβ plaques. Subsequently, it was reported that amyloid itself could activate the complement cascade, even without the involvement of antibodies (as pattern recognition of damaged-self) (Salminen et al., 2009). This mechanism, overcoming the NIReg protective function, is functional in the general circulation, mediated by C3b and CR1 on erythrocytes. Furthermore, the genetic association between complement receptors or regulators (CR1 and clusterin) and AD has been suggested, opening the more vast scenario involving inflammatory regulators, lipid metabolism, complement, and platelets in the development of the disease (Jun et al., 2010). It has been demonstrated a coordinated involvement of clusterin, involved in complement-mediated cell lysis (also known as apolipoprotein j) (Figure 1), phospholipase-A2 (PLA2) and platelet-activating factor (PAF) (Osborn et al., 2007; Jun et al., 2010; Sanchez-Mejia and Mucke, 2010). The deficit of the early stage complement factors (e.g., C3) in AD mouse models has been shown to increase deposits of Aβ and accelerate the disease progression, probably due to a neuroprotective role played by the complement in clearing the plaque in the early phases of their formation (Wyss-Coray et al., 2002; Maier et al., 2008). These data must be considered with a caveat since the AD transgenic mouse model has been considered deficient in fully mimicking the human AD pathophysiology (Schwab et al., 2010). However, the immune system, considering the toll-like receptors (TLRs) or nucleotide-binding oligomerization domain (NOD)-like receptors and cytokines release, seems to share a common network with immune cells, complement and coagulation cascade through the damage-associated molecular patterns (DAMPs) recognition (Salminen et al., 2009).

Thrombin and the DAMP high-mobility group box protein 1 (HMGB1) have been associated to impaired memory formation acting cooperatively on the neuro-immune pathway, disrupting the neurovascular unit (Festoff et al., 2016). HMGB1 in particular seems to act via TLR4 and the receptor for advanced glycation end product (RAGE) impairing memory in an animal model (Mazarati et al., 2011).

Chronic vasculopathies and hypoxic damage have been reported in AD patient, along with fibrin depots in both capillaries and large vessels without the typical ischemic stepladder progression of the vascular dementia (Mazza et al., 2011). Besides the vascular hypo-perfusion and/or blood stasis, the fibrin deposition could play a signaling role in sustaining CNS inflammation and BBB failure, along with tight-junction digestion and ECM remodeling following blood cell invasion (Mosesson, 2005).

Considering Aβ deposition as a putative mechanism triggering the self-generating, self-sustaining degenerative process, and a DAMP itself prompting the immune system, Aβ-mediated expression of MMP-9 could alter the neurovascular unit and partially account for the intracerebral amyloid angiopathy (CAA) and the spontaneous parenchymal hemorrhages that almost constantly accompany disease progression (Hartz et al., 2012). Thrombin and FXIIIa are constituents of Aβ deposits in the vessel walls in CAA, suggesting a local activation mediated by amyloid, while FXIIIa can also form complexes with Aβ (both Aβ-40 and Aβ-42 fragments) by a mechanism that is independent of the binding site employed during fibrin ligation, and Ca²⁺ dependent (de Jager et al., 2015).

High thrombin concentration has a neurotoxic effect on microvessels of AD patient and can induce astrocytes apoptosis and BBB disruption followed by edema and blood leakage (Thal et al., 2008; Hartz et al., 2012; Schneider, 2016). Aβ-42 itself can be considered as a thrombin activating factor through FXI and FXII sequential activation, as shown in response to Aβ-42 oligomers (Zamolodchikov et al., 2016). This process further involves C1 inhibitor that can block FXIa, FXIIa, and kallicrein, endorsing the integration of the neuro-immune hemostatic model (Zamolodchikov et al., 2016). This thrombotic effect could be counterbalanced by soluble (s)APP expressing several Kunitz-type protease inhibitory domains, being able to block the protease functionality of coagulation factors at multiple levels (Ben Khalifa et al., 2012). The sAPP is produced during the Aβ-42 formation with a substantial possible balance between activation/repression of hemostasis. However, accumulation of one of these two fragments in several areas of CNS and blood vessels can account for the spotty aspects of thrombosis and hemorrhage, thoroughly described in the pathophysiology of the AD (Ramanathan et al., 2015). Protease nexin 1 (PN1) is a potent thrombin inhibitor released by glial cells that has been found extremely reduced and complexed with thrombin in AD patients, although its activity in Aβ depots was increased, probably due to the excess of thrombin (Vaughan et al., 1994; Baloyannis, 2015). Thrombin effects in AD, however, seem to be essentially regulated by PAR-1 through Gi/phosphatidylinositol-3 kinase (PI3K) signaling (Voss et al., 2007) and MMP-9 upregulation to prompt pathological effects on cells, endothelium, and ECM (Lin et al., 2014). Furthermore, MMP-9 activity is induced by plasmin, which converts pro-MMP-9 to active MMP-9. In addition to its effect on other ECM components, MMP-9 is involved in the degradation of nerve growth factor (NGF), a neurotrophin essential for development and function of cholinergic and other NGF-responsive neurons (Cuello et al., 2009; Cirillo et al., 2016). On the other hand, the tPA-plasmin system itself regulates the processing and maturation of pro-NGF and pro-BDNF to their corresponding mature forms (Lee et al., 2001; Pang et al., 2004; Bruno and Cuello, 2006; Colangelo et al., 2012). This implies that, in addition to the transcriptional events regulating neurotrophin levels (Colangelo et al., 2004), both thrombin and the tPA-plasmin system play a pivotal role in modulating neuronal differentiation and the structural changes linked to activity-dependent plasticity or Aβ toxicity.

Neoplastic Diseases

Neoplasm developing inside the skull may be subdivided in primary lesions developing from resident cell clones (astrocytes, meninges, pituitary gland, bone or vascular structures, neurons or embryonic remnants) and secondary brain tumors, originating from systemic tumor metastasis, which are the most common (de Robles et al., 2015). The primary lesions from lung, breast cancers account for the 75% of metastasis, while melanoma, testicular and renal carcinomas are rare, but most likely tend to metastasize to the brain (Gallego Perez-Larraya and Hildebrand, 2014). The overall incidence of all brain tumors worldwide is 25.48 cases per 100,000 person (de Robles et al., 2015).

Several reports have shown a role of activated platelets in inflammatory chronic processes and metastatic cancer (Nurden, 2011). Platelets in metastatic cancer patients change the expression of VEGF, PF4 and TSP-1 with increase of platelet number and marks of persistent activation (Wiesner et al., 2010). VEGF is increased, while PF and TSP-1 are reduced, raising multiple hypotheses for the differentially released mediators, the platelets protein scavenging function, or the modulation of the megakaryopoiesis (megakaryocyte maturation and subsequent platelet formation from the common hemopoietic stem cell) (Geddis, 2010). It has been shown that platelet depletion, or the block of platelet surface receptors, decreases metastasis formation and tumor-platelets aggregates in animal models. This correlation between platelets and tumor metastasis is the shield hypothesis (Erpenbeck and Schon, 2010).

Embolization of tumor cells covered by platelets could be one of the ways for cancer spreading. Platelets may be an anchorage system by their subendothelial receptors and integrins (such as P-selectin, GPIb, αIIbβ3) to breakdown the neurovascular unit and defeat the ECM resistance through MMPs secretion, producing a shield against the immune system, releasing transforming growth factor beta (TGF-β) and inhibiting natural killer cell antitumor reactivity (Kim et al., 1998; Kopp et al., 2009). Tumor cells can promote thrombocytosis by interfering with the megakaryocytopoiesis or by releasing unknown inflammatory cytokines (Falanga et al., 2009). Cancer produces a well-known hypercoagulability state and thrombin can promote cancer growth and VEGF release supporting the vascular net growth in the expanding mass (Falanga et al., 2009). Platelets factors also play intriguing roles in promoting metastasis and favoring angiogenesis through VEGF release. Although platelets express anti-angiogenic factor, such as TSP-1, PF4 and endostatin (Zaslavsky et al., 2010), they are the main serum sources of these mediators (Browder et al., 2000; Folkman et al., 2001). In the recent years, extensive literature has been produced on the increase of these proteins in cancer, aiming to define whether it is specific of the early cancer stages or regulating tumor growth, however, the precise mechanism underlying metastasis and neuro-immune system crosslink remains to be explained (Nurden, 2011). From this perspective, the C-type lectin-like receptor 2 (CLEC-2)A plays a key role in mediating tumor interactions; it binds to podoplanin, physiologically expressed on kidney podocytes and lymphatic endothelial cells, protecting the tumor from the immune system aggression and inducing platelet aggregation and tumor metastasis progression (Suzuki-Inoue et al., 2007).

Gliomas are the most common primary CNS tumors (Louis et al., 2016). They are classified, by the World Health Organization (WHO), by their molecular markers, the biological activity and the histologic features, from grade I (non-malignant and slowly-growing associated with long-term survival) to grade IV (very aggressive malignant tumors, with fast-rate growing and short patient survival) (Popova et al., 2014; Louis et al., 2016). In adults, the glioblastoma multiforme (GBM) is the most frequent grade IV glioma characterized by highly infiltrative mass, with diffuse necrosis inside, highly infiltrative nature and whole brain diffusion, marked angiogenesis, apoptosis deregulation, and high genetic instability (Popova et al., 2014; Louis et al., 2016).

Thrombin levels into the lesion are very high, with a typical co-occurrence of thrombosis and hemorrhage that could in some extent favor the uncontrolled dissemination and growth of the malignant mass (Le Rhun and Perry, 2016; Mihara et al., 2016). The transduction-signaling pathway of thrombin, in these circumstances, is essentially by the canonical activation of PARs. Activation of PAR2, the lower affinity receptor, is possible, due to its high concentration found in brain tumor and following a vascular injury (Mihara et al., 2016). The putative PARs transactivation and dimerization could affect several cell functions by multiple transduction signals, still unknown but a promising gateway to design new therapeutic strategies (Mihara et al., 2016).

Tumor gene instability causing the development of cancer, whatever is the underlying mechanism or causative gene, leads to an altered cell proliferation/apoptosis ratio with the immortalization of a cellular clone. This process is, at final steps, regulated by mitogen activated protein kinases (MAPK), mainly extracellular signal–regulated kinase (ERK)1 and ERK2 (Nicole et al., 2005; Carmo et al., 2014). The intracellular transduction pathway seems to be cell-type related; however, the PI3K/PLC/PKC transduction can be considered as the key player (Wang and Reiser, 2003). PAR1, is even in these circumstances the crucial thrombin receptor and its expression, well-investigated in metastatic tumor, seems to be correlated to the tumor grading and invasiveness (Zhang et al., 2011), thus opening the research for future development of targeted chemotherapies (Kirwan et al., 2016). PARs can react with platelets beyond the tumor cells site. Platelets recognize also normal resident cells, not involved in the neoplastic process, and exert a neurotoxic effect on the healthy tissue, whereas tumor cells, expressing platelet receptors (mimicry phenomenon) can activate mitogenic pathways through the interaction between thrombin and PAR1-4 (Sotnikov et al., 2013; Wojtukiewicz et al., 2016). Surprisingly thrombin, at the site of the lesion, may mediate a protective role in a concentration independent manner. The protease can process the esophageal cancer related gene 4 (Ecrg4) having a chemotactic property for myeloid cells and can activate a host-versus-cancer pro-inflammatory reaction, slowing tumor growth (Lee et al., 2015), hastening the neuro-immune response. Ecrg4 that could in principle be the switch between thrombin adaptive/maladaptive changes and a key node in the neuro-immune activation is indeed downregulated in the high grade gliomas (Gotze et al., 2009).

Thrombin is involved in the persistent release of growth factors, as discussed for VEGF and tumor neo-angiogenesis (Hua et al., 2005). Fibrin, stabilized by FXIIIa is one of the proposed mechanism of the immunological masking (Walter et al., 2012). Kallicreins (Drucker et al., 2015), and specifically kallicreins 6-7-9, are also associated with poor survival in patients with GMB. How these serine proteases directly promote tumor cell survival need to be revealed, however, kallicrein 6 induces resistance to radiation and chemotherapy (temozolomide) in glioma cells by a PAR1 dependent mechanism (Drucker et al., 2013, 2015).

The TF, the principal initiator of coagulation, is also upregulated in gliomas and perilesional tissues (Walter et al., 2012; Le Rhun and Perry, 2016), hence being the activator of many thrombin-related toxic effects. Microglial activation has harmful effects on neurons and astrocytes (Zimmer et al., 2010) when exposed to high-level of thrombin and the reaction is characterized by intra and perilesional edema and altered leukocyte infiltration (Walter et al., 2012) or complement activation (Horstman et al., 2011). The complement system has been historically correlated to the cancer destruction mediated by the innate immune system, but it has been reported that a component of the system can promote the growth of malignant tumors (Markiewski and Lambris, 2009). The occurrence of C3 and C5b-9 complex depots in patients with GBM suggests the involvement of these proteins in the cancer process, even though serum level of complement system does not correlate with patient survival (Bouwens et al., 2015).

Psychiatric Diseases

Mental health has many definitions. The WHO recognizes the “state of well-being” as the possibility to realize the person’s potential, resilience to the normal life stressors and, based on the social nature of our species, it emphasizes that for mental health recognition a person should make a working contribution to the community (Manwell et al., 2015). The absence of mental health, without detectable macroscopic organic lesion, is the domain of psychiatric diseases. The most treated and frequent disorders are unipolar depression, bipolar disorder, schizophrenia, and substance use disorders (addiction). Depression, expressed to a great extension among the population, is strictly related to blood coagulation disorders and complement activation (Thombs et al., 2006; Dantzer et al., 2008). The incidence of this disease grows from the 5% of the population up to 20% in subjects following ischemic heart diseases; moreover, cardiovascular diseases represent an independent risk factor for major depression (Forrester et al., 1992; Frasure-Smith et al., 1993; Thombs et al., 2006).

There are many variables to take into consideration when relating infarcts and depression. Obviously, scarce therapy compliance and negative habits (e.g., smoking, physical inactivity, dietary high calories intake) may influence both diseases; however, the role played by the underlying molecular pathways must be taken into account (Nemeroff and Musselman, 2000; Parissis et al., 2007). A 20-year study has shown that men which were hostile and prone to anger or depression had a complement system hyper-activation with the increase of C3, that could favor an ischemic heart disease. The study results were standardized for age, alcohol intake, and body mass index (BMI) (Boyle et al., 2007).

The relation between C3 increase and heart diseases has been confirmed in both myocardial infarctions and stable angina pectoris (Yan et al., 2016). In a mouse model of depression the levels of glial protein S100B and C3 has been found significantly lower in the amygdala, hippocampus, hypothalamus, prefrontal cortex, and striatum in control and after peripheral LPS administration (Strenn et al., 2015). The role of C3 in the development of CNS has been studied in C3 deficient mice; they showed reduced immature synapse elimination and development of aberrant neuronal networks (Stevens et al., 2007). In schizophrenic patients, in comparison to bipolar patients and healthy subjects, the C3 and C4 serum concentrations and their hemolytic properties were decreased (Spivak et al., 1993). A pathway proteomic profile of ischemic stroke survivors with mild depression showed that both lectin and the classical pathway of complement activation are downregulated and the phenomenon is associated with depressive symptoms (Nguyen et al., 2016). C3 is pivotal for the entire process; it is required for both lectin and classical activation of complement and for immune system regulation.

Platelets are the putative intriguing link interlacing mental, immune system, and coagulation-related disorders. These elements pivotal in the coagulation and complement cascade are the main reservoir of systemic serotonin. Indeed, their hyperactivity could explain both ischemic and depressive disorders (Nemeroff and Musselman, 2000; Musselman et al., 2002). Patients affected by major depressive disorder (MDD), matched with healthy subjects, showed increased platelet activation and expression of GPIIb-IIIa and P-selectin (Musselman et al., 1996). Platelets BDNF-containing granules were decreased in MDD, which could account for the limbic cortical thickness reduction (Duman and Monteggia, 2006; Liu et al., 2012). Treatment with the Citalopram, a selective serotonin reuptake inhibitor (SSRI), normalized BDNF level. Additionally, a single nucleotide polymorphism (SNP) of BDNF has been frequently associated with MDD, bipolar disorder (Sen et al., 2003), and coronary heart disease (Bozzini et al., 2009). It has been reported that the physiological response of platelets to thrombin is increased in manic, compared to depressed or schizophrenic patients, via a PKC modulated pathway (Wang et al., 1999). Mental health disorders are generally associated to a pro-coagulatory activity showing fibrinolytic residues in the general circulation (this is partly reversed by the therapy) (Schroeder et al., 2007; Geiser et al., 2011). The methylenetetrahydrofolate reductase (MTHFR) gene variant C677T, involved in the one-carbon metabolic pathway which is essential for DNA biosynthesis and the epigenetic process of DNA methylation, a cardiovascular and ischemic stroke independent risk factor, has been associated with schizophrenia, bipolar and unipolar depressive disorder (Peerbooms et al., 2011; El-Hadidy et al., 2014).

Psychoactive drugs interact with the CNS reward system and cause a substance abuse disorder (also known as addiction) interfering with the fine neurotransmitters balance (Goldstein and Volkow, 2002). Substance abuse disorder is a self-maintaining disorder with the dismal capacity of compulsive seeking repression, which overcome self-preserving mechanisms and the judgment of risk-taking (Hyman and Malenka, 2001). The social burden and the danger, deriving from the incapacity of measuring the negative outcome of actions, make addiction devastating, especially when it evolves in a chronic condition with the failure of the scarcely available treatments (O’Brien, 2011). Opiate abuse has been related to the deficiency of blood coagulation cascade with an increased fibrinolysis and higher levels of α2-macroglobulin (Ceriello et al., 1985). Morphine, methamphetamine, and nicotine increase the release of dopamine in the nucleus accumbens and activate post-synaptic dopamine receptors D1 (D1R). D1R activates cAMP/PKA pathway and extracellular enhancement of tPA activity in the nucleus accumbens that regulates dopamine release through PAR1 and is involved in the double mechanism of reward and dependence (Ito et al., 2007; Nagai et al., 2008). Ethanol addiction and withdrawal further enhance tPA activity. This mechanism is not plasmin-PAR1 mediated, but it produces the overexpression of NR2B subunit of the N-methyl-D-aspartate receptor (NMDAR) without intermediate proteolytic activity. Ethanol could inhibit the glutamate receptor whose expression is compensatively increased, until a rapid decrease of ethanol levels relieves the inhibitory tone on the overexpressed NMDAR population, leading to withdrawal symptoms and even seizures (Pawlak et al., 2005; Nagai et al., 2008).

Perspective

Experimental and clinical reports unequivocally correlate the coagulation with the immune system and neuroinflammatory, degenerative, ischemic, proliferative, and functional disorders of the CNS. Platelet-derived, complement and clotting factors, CNS resident cells and protease intracellular signal transduction can modify the neurovascular unit integrity and recruit leukocytes at the site of the damage (Figure 2). Circulating coagulation proteins, complement and immune cells interact with several messengers and with each other to provide an active continuous scavenging activity, promptly correcting the structural or functional failures that constantly jeopardize the CNS homeostasis.

Central nervous system elements are partially protected by the immune privilege guaranteed by the BBB, through a constantly and actively filtering operated by endothelium, astrocytes, pericytes, and ECM. However, they express all the potential ligand and receptors to react actively to external damage. The chronicity of this reaction, mediated by both endogenous as exogenous elements can partly account for the switch between a remedial adaptive plasticity to the damage and a maladaptive rewiring of the CNS with disruption of synaptic stability and aberrant formation of newly deposed ECM. In the neuro-immune hemostasis framework concurring to CNS pathology, the coagulation and the immune system are cooperative in pathophysiological conditions, specifically after the BBB failure.

The analysis of literature data on cellular-protein-interactions involved in neuro-immune hemostasis allows designing a proposal for the main protein-hubs of this network formed by three fundamental nodes and one internode (Figure 3). The first node of the network is thrombin with activation of PAR-1 in a dose-dependent manner; the second node is C3, linking coagulation, synaptic plasticity and immune system; the third node is GPIb, essential for activated platelet anchorage, coagulation processes, thrombin activation and C3 activation. The internode is represented by αMβ2 integrin (part of the CR3) connecting the second and the third node of the network.

FIGURE 3

To better understand how to favor the maintenance of the remedial adaptive plasticity, which would have a clear therapeutic interest for several pathological conditions, it would be useful to construct predictive molecular models, like the proposed network. The perspective is to be able to enlighten the regulating logic of the complex molecular network of Figure 3, which belongs to different cellular domains (neurons, astrocytes, BBB, and blood cells).

Several types of mathematical models have been described in the literature to analyze complex patho/physiological functions. The more immediate tool is offered by network analysis (Loscalzo et al., 2017), which builds on protein–protein interaction map (PPI), performed at genome-wide level. For several diseases it has been reported where the nodes of the network under examination (in our case those of Figure 3) cluster on the general PPI map. In this way, it would be possible to ascertain which basic cellular functions interact with the cluster under investigation. It would be of interest, for instance, to know whether one of the nodes in Figure 3 interacts with mitochondrial metabolism, autophagy or apoptosis.

Other possibilities are offered by dynamic systems biology models (Abudukelimu et al., 2018; Barberis et al., 2018), whose computational analysis has been able to shed some light on the regulatory logic governing either inflammation response or T cell differentiation. It is expected that the interactions of computational models and new experiments, suggested by the model predictions, will be able to elucidate the fine structure of molecular events generated by blood coagulation and neuro-immune response in several CNS diseases, thereby opening the way to more effective treatments.

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