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Proteinase 3; a potential target in chronic obstructive pulmonary disease and other chronic inflammatory diseases

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Abstract

Chronic Obstructive Pulmonary Disease (COPD) is a common, multifactorial lung disease which results in significant impairment of patients’ health and a large impact on society and health care burden. It is believed to be the result of prolonged, destructive neutrophilic inflammation which results in progressive damage to lung structures. During this process, large quantities of neutrophil serine proteinases (NSPs) are released which initiate the damage and contribute towards driving a persistent inflammatory state.

Neutrophil elastase has long been considered the key NSP involved in the pathophysiology of COPD. However, in recent years, a significant role for Proteinase 3 (PR3) in disease development has emerged, both in COPD and other chronic inflammatory conditions. Therefore, there is a need to investigate the importance of PR3 in disease development and hence its potential as a therapeutic target. Research into PR3 has largely been confined to its role as an autoantigen, but PR3 is involved in triggering inflammatory pathways, disrupting cellular signalling, degrading key structural proteins, and pathogen response.

This review summarises what is presently known about PR3, explores its involvement particularly in the development of COPD, and indicates areas requiring further investigation.

Background

The serine proteinase Proteinase 3 (PR3) is an enzyme released during neutrophilic inflammation and is capable of cleaving many targets including key structural proteins of the lung. Chronic Obstructive Pulmonary Disease (COPD) is an inflammatory condition associated with neutrophilic inflammation. For this reason neutrophil elastase (NE) has long been considered to be a central, proteinase in the pathophysiology as it can replicate many of the structural changes of the disease and hence a potential target for therapeutic manipulation, PR3,another key neutrophil serine proteinase has largely been ignored, even though it may have an important additional role in the lung as well as other human diseases [1]. This review summarises the current literature to provide an update on the potential role of PR3 in health and disease, with a primary focus on COPD.

Proteinase 3

PR3, alternatively referred to as myeloblastin, azurophil granule protein-7 or p29b, is a highly abundant neutrophil protein which is genetically transcribed in primitive myeloid and monocytic progenitor cells, and expressed in cells of granulocyte and monocyte linage, especially neutrophils but including mast cells and basophils [2,3,4,5] and in the neutrophil, it is mainly located within the primary azurophil granules of the mature cell but is also present in specific granules, secretory vesicles, and on the cell surface [6, 7]. It is expressed constitutively on the membrane by naïve neutrophils in peripheral blood of healthy individuals (known as “constitutive” PR3) and is secreted into extracellular medium by activated neutrophils following granule translocation to the cell membrane (known as “induced” PR3) [8,9,10,11].

It is encoded by the gene PRTN3 which is located at human chromosome 19p13.3 and spans 6.57 kb pairs including 5 exons and 4 introns. The gene consists of 222 amino acids that fold to form the 29 kDa glycoprotein PR3 [4].

PR3 is classified within the family of “chymotrypsin”-like neutrophil serine proteinase (NSP) which are identified by their highly conserved catalytic triads (His57, Asp102 and Ser195; using chymotrypsinogen numbering) for proteolytic activity and defined by their active site serine residue [4, 12]. PR3 possesses an enlarged binding site with high specificity and differs from NE by 4 main subsites, S2, S1’, S2’ and S3’ (Fig. 1). which is common to other NSPs, including NE [12]. However, PR3, specificity is further defined by difference in residues which alter subsite specificities (subsites shown in Fig. 1).

Fig. 1
figure1

Diagrammatically demonstrates the substrate binding pockets S4-S3’ of PR3 with substrate cleavage positions P4-P3’, according to the Schechter and Berger enzyme-ligand binding site numbering convention [19]. The arrows indicate the sites for Val/Ala-containing peptide cleavage and hydrophobic residue binding sites, whilst + indicates positive and – indicates negative residue binding site. Adapted from [13]

These specificities are determined by:

  • Amide hydrogens on Gly193 and Ser195 which stabilise charge during catalysis [14].

  • 3 charged residues: Lys99, Asp61, Arg143 within the active site region.

  • Positioning of the solvent accessible Lys99 (compared to Leu99 in NE), which borders the S2 and S4 sites and makes the S2 subsite deeper and more polar, in addition to reducing its hydrophobicity, which determines preferential binding of negative and polar residues, such as Asp [12, 16, 17].

  • Asp61 brings the proteins negatively charged side chain closer to the S1’ and S’3 subsites, making the subsites smaller and more polar, which encourages binding of basic residues at P1’ and P’3 [12, 16].

  • Arg143 (and Pro151) increase the polarity of the S2’ subsite which creates a basic S2’ subsite that binds acidic residues [12, 16].

  • Asp213 (compared to Ala213 in NE) restricts the S1 binding site causing it to preferably bind small hydrophobic residues at P1, which includes alanine, serine, valine, norvaline, and methionine [12, 14, 16,17,18].

  • Ile217 allows small hydrophobic residues at P4 to bind whilst with Trp218 creating a more hydrophobic S5 subsite [12, 14, 16].

PR3 is initially transcribed as an inactive precursor referred to as a zymogen and then undergoes a two-stage posttranslational modification to become active. Firstly (via signal peptidase), there is N-terminal signal peptide cleavage, followed by cleavage of the N-terminal pro-di-peptide by the cysteine proteinase, cathepsin C which is essential for enzymatic activity. Secondly it undergoes pro-peptide cleavage at the C terminal, which is crucial for granule packaging. This forms the catalytic triad of residues and the final conformation of mature PR3, as shown in Fig. 2, which is stabilised by disulphide bonds and appropriate asparagine-linked glycosylation [4, 12, 20]. PR3 then remains stored within the neutrophil azurophil granules until release.

Fig. 2
figure2

Three-dimensional visualisation of Proteinase 3 by ribbon plot, with the catalytic triad and PR3-specific residues stylised in a stick representation and annotated. Image developed from the Proteinase 3 Protein Data Bank entry (PDB ID: 1FUJ) [15, 21] using YASARA [22]

There is estimated to be 3 pg of PR3 stored in each neutrophil, alongside other key serine proteinases, with a mean PR3 concentration of 13.4 mM in each granule, which is 3–4 fold higher than NE [23]. Once released, either constitutively or via granule translocation, PR3 can act enzymatically in both an intracellular and extracellular manner. Its activity is then controlled through inactivation by inhibitors (both reversibly and irreversibly), including serine proteinase inhibitors (Serpins), chelonianin inhibitors and also alpha-2-macroglobulin [24,25,26].

PR3 has many functions. Animal transgenic and knockout models have demonstrated that it is able to cleave structural proteins leading to tissue remodelling (as discussed within ‘Pathophysiological functions of PR3 in COPD’), through diffusing deeper into tissues than the other NSPs [27,28,29,30]. Other functions assist in the defensive immune role of the neutrophil including regulating a variety of cellular processes, cleaving host protein into antibacterial peptides and activating pro-inflammatory cytokines [31, 32]. Dysfunction of these systems has long been associated with the development or progression of a number of chronic inflammatory diseases including COPD, but often without reference to the potential role of PR3.

Pathophysiological functions of proteinase 3 in COPD

PR3 is likely to have more involvement in the pathophysiology of COPD than previously thought, supported by evidence of increased PR3 activity described in these patients [33,34,35]. COPD is a progressive, destructive lung disease associated with chronic neutrophilic inflammation and marked by obstruction of airflow, reduced physical activity and breathlessness [36].

The pathophysiology of COPD is considered to reflect an imbalance between proteinases and anti-proteinases in the lung, and Sinden et al. produced the first substantive evidence to support the role of PR3 in a three-dimensional reaction diffusion lung interstitium model [27]. The authors demonstrated that active proteinase diffusion distance following release from a neutrophil varies predominantly depending on concentrations of local physiological inhibitors and that this was greater for PR3 than NE [27]. Generally, activated proteinases have the potential to cause direct lung damage, whereas anti-proteinases provide protection to limit this process. In the lungs, a homeostatic balance is largely maintained, with the exception of a region of quantum proteolysis surrounding migrating and degranulating neutrophils which is larger in patients with α-1 anti-trypsin deficiency (AATD) explaining the increased susceptibility of these subjects to COPD [37]. This reflects the high concentrations of NSPs released from the granules compared to the immediate concentration of the physiological inhibitors. As the NSPs diffuse away from the neutrophil, the concentration falls exponentially until it equals that of the surrounding inhibitors when activity ceases [37]. It is believed that when levels of NSPs, including PR3, exceed the amount of protective anti-proteinases, such as α-1 anti-trypsin (AAT), excessive damage to lung tissue and other proteinase effects are facilitated [38].

It was previously believed that NE played the key neutrophilic role in tissue damage leading to emphysema, especially in subjects with genetic deficiency of AAT. However, recent data has challenged this concept and supports a potential role for other NSPs including PR3 [33]. Firstly, when a migrating neutrophil degranulates in vitro, it is expected to release more PR3 than NE from the azurophil granules. In vitro some of this becomes membrane bound and more resistant to inhibition, also the free enzyme still has a far greater radius of activity than NE [10, 39, 40]. In addition, although local lung-derived inhibitors are able to inhibit NE the same is not true for PR3, and persistent activity is detectable in lung secretions when NE activity is not [41, 42]. This is important as it implies all the pathological changes in the lung attributed to NE may also be produced by PR3 and potentially to a greater extent.

This theory is supported in vivo by the development of emphysema in hamsters receiving local administration of PR3 and further by recent evidence that SerpinA1-deficient murine models develop spontaneous emphysema [43, 44]. In addition, NSP-knockout murine models are protected against developing emphysema induced by cigarette smoke, whereas mice only deficient in NE are less susceptible, implying that either cathepsin G or PR3 played an important role [30]. Collectively these models suggest that, as well as NE, PR3 is potentially able to contribute to the development of emphysema in humans.

Biochemical studies have shown that PR3 cleaves extracellular matrix (ECM) proteins, including elastin, fibronectin, vitronectin, laminin and collagen, at a GXXPG site within a β-fold conformation resulting in protein degradation [17, 45, 46]. These proteins are important components of tissue structures and, it is the degradation of the extracellular matrix which results in the connective tissue injury in the lung interstitium leading to emphysema, as observed using biomarkers in human COPD and as induced in several animal models [43, 46,47,48]. Indeed, recent evidence suggests PR3 specific cleavage of elastin is elevated in COPD providing more direct evidence of its role [33].Like other NSPs, PR3 can also affect mucus clearance by damaging bronchial epithelium and cilia [16]. In addition, PR3 is able to induce mucus production from submucosal gland serous cells and PR3 activity has been implicated in this role in cystic fibrosis (CF) [49]. The net result is excess mucus production in the airways and impaired mucus clearance, which is also a feature of chronic bronchitis, and therefore PR3 is likely to have a similar role in COPD. AATD is a genetic cause of emphysema and chronic bronchitis (in about 30% of patients) and is the result of mutations resulting in little/no production of functional AAT protein. PR3 has a lower association rate with AAT than NE, which means that, in patients with AATD, PR3 is even more poorly regulated, causing a greater proteinase/anti-proteinase imbalance than with NE, and hence potentially mediates more damage to the lungs [4, 27, 50].

As well as causing direct tissue damage, PR3 is also potentially involved in amplifying the inflammation associated with COPD as with other chronic inflammatory diseases.

PR3 is known to modulate a variety of cytokine functions, which impact processes such as metabolism and inflammasome generation [51,52,53]. The enzyme facilitates an increased production and/or modulation of proinflammatory cytokines and the reduction of anti-inflammatory cytokine production as summarised in Table 1. Many of these cytokines have been implicated in a number of inflammatory diseases, which supports a putative role of PR3 in chronic inflammatory conditions in general as well as COPD with and without AATD.

Table 1 Summary of the cytokines affected by PR3, with the PR3 action on cytokines and the resulting response. The processes relevant to the pathophysiology of COPD are highlighted in bold

All these cytokines can act through autocrine, paracrine and endocrine pathways to activate pro-inflammatory cascade responses and upregulate pro-inflammatory genes and transcription factors leading to an inflammatory state [65]. The products of these key inflammatory pathways can further induce feedback loops to enhance chronic inflammation [66,67,68]. Therefore (similarly to NE) PR3 can potentially play multiple roles in the initiation and amplification as well as the resolution of inflammation, at least as demonstrated in vitro.

More recently, PR3 has been also found to degrade the anti-inflammatory mediator progranulin (PGRN), resulting in generation of granulin (GRN) peptides in vitro [32, 68,69,70]. PGRN degradation causes increased neutrophil infiltration, activation of reactive oxidative species, pro-inflammatory cytokine production and anti-inflammatory pathway inhibition, sustaining an inflammatory state in other inflammatory disease [71]. GRN molecules are also known to accumulate and release the chemoattractant interleukin (IL)-8 amplifying neutrophil recruitment [70, 72]. In clinically-stable COPD, the concentration of PR3 in airway secretions is a stronger predictor of PGRN levels than NE, because of its greater neutrophil concentration and hence greater secretion activity [69].

PR3 is also able to act in a pro-inflammatory manner by interacting with the complement pathway. It is able to fragment the neutrophil surface complement component 5a (C5a) receptor, resulting in the loss of the N-terminus and an inability to bind C5a [73]. In CF, the lack of C5aR signalling contributes towards inefficient clearance of microbial infections in vitro and also inactivates signalling and stimulates neutrophils to degranulate [73]. This results in a cycle of dysfunctional neutrophils thereby perpetuating the bacterial-stimulated inflammatory signals and further neutrophil recruitment. Although there is no direct evidence, it is likely that C5aR inhibition by PR3 also has a role in COPD with elevated levels of C5a in the sputum of patients and correlations with circulating C5a, physiological gas transfer and the degree of emphysema [74]. Further research is clearly indicated to determine the relevance of this mechanism in COPD.

Despite the potential to impede bacterial clearance, it has also been reported that PR3 itself possesses bactericidal properties through cleavage of the pro-microbicidal protein hCAP-18 (human cathelicidin) into the antibacterial peptide, mucus inducer and neutrophil chemo-attractant LL-37 [51, 75,76,77,78]. Furthermore, levels of LL-37 in sputum are related to disease severity in patients with COPD suggesting an indirect role for PR3 which is worthy of further investigation [79].

In addition, PR3 can adhere to neutrophil extracellular traps (NETs) contributing towards the destruction of bacterial virulence factors [80,81,82]. However, many respiratory-relevant bacteria, such as Streptococcus pneumoniae and Haemophilus influenzae, have evolved NET evasion mechanisms which may overcome this potential clearance mechanism [83, 84]. It has also been noted that patients with Pseudomonas aeruginosa infection are more susceptible to poor outcome when lacking sufficient PR3 inhibition and patients with AATD are at particularly high risk of respiratory infection and lung damage as other natural proteinase inhibitors are unable to compensate for low AAT levels [27, 85]. This is again amplified by the greater neutrophil PR3 content and the fact that the other major lung inhibitor of serine proteinases, secretory leukocyte proteinase inhibitor (SLPI), does not inhibit PR3 [86].

However, PR3 is also able to inactivate SLPI, by cleaving at the Ala-16 site within the N-terminal and preventing SLPI/enzymes complex formation which would indirectly amplify the local activity of other serine proteinases such as NE [86].

Analysis of biopsied lung tissue, from patients with severe emphysema, has shown that cytosolic PR3 interrupts the initiation of anti-inflammatory mechanisms and promotes an apoptotic environment, inducing death of lung epithelial cells which has been implicated in the pathophysiology of emphysema by a further indirect route [87].

An additional mechanism implicated in the pathophysiology of COPD involves the receptor for advanced glycation end-products (RAGE) and soluble RAGE. In prostate cancer cell lines, PR3 has been shown to bind to RAGE both promoting cell activation and preventing its cleavage which escalates inflammation [88, 89]. Furthermore, decreased levels of sRAGE have been implicated in emphysema development [89, 90]. Clearly the relevance of this alternative function also needs to be explored in relation to COPD.

Pathophysiological functions of proteinase 3 in other diseases

The actions discussed above are not just relevant to COPD but are relevant to the pathophysiology of many other diseases. PR3 also has many additional roles which can lead to, or amplify other disease states (see Fig. 3).

Fig. 3
figure3

Summary of the actions of Proteinase 3 (PR3), as outlined in this review, which likely impact on COPD and other systemic diseases. The processes with a putative central role in the pathophysiology of emphysema are highlighted in bold

As noted in Table 1, PR3 has both a direct and indirect effect on many cytokines and hence can have further downstream influences on diseases beyond or associated with COPD, as outlined in Table 2.

Table 2 Cytokines influenced by PR3 (as shown in Table 1) and implicated in disease states other than COPD

However, although the effects of dysregulation of these cytokines are also implicated in other diseases, PR3 has not been directly studied in relation to their pathophysiology.

In addition, the interaction between PR3 and PGRN also likely has wider impact than in COPD, through a further role in inflammatory conditions involving PGRN, including lipopolysaccharide-induced acute lung injury, dermatitis and inflammatory arthritis (in murine models), as well as a reported genetic link between loss-of-function mutations in PGRN and the development of neurodegenerative disease [99,100,101,102,103,104].

It is also suspected that PR3, alongside other NSPs, could have a role in ECM breakdown affecting the pathophysiology of diseases in other organs, such as aneurysms due to vascular remodelling as shown in porcine vasculature; however the relevance has not yet been investigated in detail in humans [105].

PR3 has a role in the efficacy of neutrophil transmigration through interaction with the cell surface receptor NB1 (CD177) which acts with PECAM-1 (CD31) during trans-endothelial migration of neutrophils [106, 107]. In CF, this is supported by a positive relationship between PR3 activity and neutrophil migration effectiveness [20]. The interaction of PR3 with NB1 and PECAM-1 is confirmed in vitro in endothelial cells, where it inhibits activation and upregulation of these adhesion molecules [108].

There is also evidence that PR3 is associated with distortion of cellular signalling pathways and the development of autonomous cell growth. In leukaemia, early expression of PR3 during haematopoiesis is able to induce factor-independent growth and overexpression of PR3 in myeloid leukaemia cells prevents their differentiation into monocytoid cells supporting this mechanism [109,110,111].

Alternatively to its pro-apoptotic role in COPD, PR3 may paradoxically prevent apoptosis in granulomatosis with polyangiitis (GPA) by associating with calreticulin, through co-externalisation with phosphatidylserine by phospholipid flip-flop via phospholipid scramblase 1 (PLSCR1), to override the ‘eat me’ signalling [112].

Finally, PR3 also has a role as an autoantigen in many diseases, including GPA and idiopathic interstitial pneumonias, and is the target of cytoplasmic (c)-anti-neutrophil cytoplasmic antibodies, also referred to as PR3-ANCA in vasculitis [113,114,115]. Development of disease is dependent on ability of PR3 to associate with the cell membrane [112]. The binding of PR3-ANCA with cell associated PR3 initiates a cascade which amplifies inflammation and results in local cellular and tissue damage [9, 114, 116,117,118].

It was suspected that PR3-ANCA formation may have a role in COPD development, as more patients with COPD were found to be antinuclear antibody positive than healthy controls [119]. However, despite a reported association with emphysema-dominant disease and lower body mass index, no clear pathophysiological relationship has been established [119]. These wide ranging pro-inflammatory effects of PR3 in other conditions therefore may be also relevant in the pathophysiology of COPD, both directly by tissue damage and indirectly through other multiple pathways of inflammation.

PR3 as a therapeutic target in COPD

There is considerable theoretical evidence and cell-based and animal-model data to support the role of PR3 in the development of COPD. However, as yet, PR3 activity in COPD has been poorly characterised.

To study PR3 in COPD requires the ability to quantify active (uninhibited) PR3 accurately and distinguish it from other NSPs to determine its specific function within biological samples. Reagents for free PR3 activity have only lately become available and until recently, detection required immunofluorescent staining of biopsy specimens, which if positive was followed by a PR3-ANCA specific enzyme-linked immunosorbent assay (ELISA) [120, 121]. Indeed, this was the internationally accepted method for diagnosing PR3-ANCA. Direct PR3 assays have been proposed as a biomarker to determine PR3 presence and production for assisting a diagnosis [122, 123]; however, like immunofluorescence techniques, they do not distinguish the active PR3 from PR3 which has been inactivated by its inhibitors. A similar challenge was seen for the measurement of NE activity and a novel approach to this has been the development of NE specific footprint, which may also be a more relevant approach for PR3 activity in vivo [124].

Whilst there is increasing interest in modifying NSP activity in conditions which predominantly feature neutrophilic inflammation, these have primarily focused on reducing the activity of NE and PR3 has not generally been considered as a relevant target in COPD.

The detection of PR3 activity, directly or indirectly, would improve our understanding of its role in COPD and individual patient’s disease activity. It would also potentially allow earlier diagnosis of diseases where PR3 activity was relevant (including COPD) before extensive damage has occurred. Understanding the role of PR3, might therefore allow earlier interventions and therapeutic strategies to be developed with PR3 as a valid target in COPD. Specific inhibitors might serve to reduce disease severity, mortality and the long-term health burdens of COPD. However, clearly the limited data available indicates there is much work to be done to clarify the likely relevance and hence impact of an anti-PR3 strategy.

Conclusions

PR3 has many important functions that are relevant to human physiology and PR3 dysfunction may play a critical role in many processes central to the pathophysiology of COPD and other chronic neutrophilic human diseases. PR3 is the most abundant serine proteinase in the neutrophil, secondarily inhibited to NE, and, in addition to the role in general inflammation, PR3 can also cause direct tissue damage central to structural aspects of diseases such as COPD. This is consistent with the potential for PR3 to produce all the pathological changes of COPD that have traditionally been attributed to NE. Understanding this role and the impact on the inflammatory cascade has major implications for the design of anti-proteinase molecules aimed at restoring proteinase/anti-proteinase balance, ensuring that destructive activity of relevant serine proteinase action and amplification of inflammation is effectively limited, and thereby preventing the development and progression of COPD.

Abbreviations

AAT:

α-1 Anti-trypsin

AATD:

α-1 Anti-trypsin Deficiency

ANCA:

Anti-neutrophil Cytoplasmic Antibodies

C5a:

Complement Component 5a

CF:

Cystic Fibrosis

COPD:

Chronic Obstructive Pulmonary Disease

COX:

Cyclooxygenases

DLCo :

Diffusing Capacity of the Lungs for Carbon Monoxide

ECM:

Extracellular Matrix

ELISA:

Enzyme-linked Immunosorbent Assay

GPA:

Granulomatosis with Polyangiitis

GRN:

Granulin

hCAP-18:

Human Cathelicidin

IFN:

Interferon

IL:

Interleukin

NE:

Neutrophil Elastase

NETs:

Neutrophil Extracellular Traps

NFkB:

Nuclear Factor Kappa-Light-Chain-Enhancer of Activated B Cells

NSP:

Neutrophil Serine Proteinase

PGRN:

Progranulin

PLSCR1:

Phospholipid Scramblase 1

PR3:

Proteinase 3

RAGE:

Receptor for Advanced Glycation End-products

Serpins:

Serine Proteinase Inhibitors

SPLI:

Secretory Leukocyte Proteinase Inhibitor

Th:

T helper Cells

TNF:

Tumour Necrosis Factor

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Crisford, H., Sapey, E. & Stockley, R.A. Proteinase 3; a potential target in chronic obstructive pulmonary disease and other chronic inflammatory diseases. Respir Res 19, 180 (2018) doi:10.1186/s12931-018-0883-z

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Keywords

  • Proteinase 3/myeloblastin
  • Serine proteinases
  • Chronic obstructive pulmonary disease
  • Lungs
  • Inflammation