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Metalloproteinases in Inflammatory Bowel Diseases

Authors Marônek M, Marafini I, Gardlík R, Link R, Troncone E, Monteleone G

Received 5 February 2021

Accepted for publication 9 March 2021

Published 23 March 2021 Volume 2021:14 Pages 1029—1041

DOI https://doi.org/10.2147/JIR.S288280

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Professor Ning Quan


Martin Marônek,1,* Irene Marafini,2,* Roman Gardlík,1 René Link,3 Edoardo Troncone,2 Giovanni Monteleone2

1Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University in Bratislava, Bratislava, 81108, Slovakia; 2Department of Systems Medicine, University of Rome “Tor Vergata”, Rome, 00133, Italy; 3Institute of Experimental Medicine, Faculty of Medicine, University of Pavol Jozef Šafárik, Košice, 040 11, Slovakia

*These authors contributed equally to this work

Correspondence: Giovanni Monteleone
Dipartimento di Medicina dei Sistemi, Università di Roma “Tor Vergata”, Via Montpellier 1, Rome, 00133, Italy
Tel +39 06 20903702
Fax +39 06 72596391
Email [email protected]

Abstract: Inflammatory bowel diseases (IBD) are chronic inflammatory diseases of the gastrointestinal tract, encompassing two main disorders: Crohn’s disease (CD) and ulcerative colitis (UC). In both these pathologies, excessive and local immune response against luminal antigens promotes a pathological process leading to various degrees of gut damage. Matrix metalloproteinases (MMPs) are a family of neutral proteases with the ability to degrade all components of extracellular matrix. In physiological conditions, MMPs are produced at very low level and generally in the latent form and are involved in the normal tissue turnover. Their function is inhibited by tissue inhibitors of metalloproteinases (TIMPs). However, in inflamed tissue of IBD patients, MMPs are produced in excess and/or the activity of TIMPs is not sufficient to block MMPs, thereby making a major contribution to the IBD-related mucosal degradation. In this review, we summarize the available evidence on the expression and role of MMPs in IBD.

Keywords: tissue inhibitor of metalloproteinases, Crohn’s disease, ulcerative colitis, intestinal inflammation

Introduction

Inflammatory bowel diseases (IBD) are chronic inflammatory diseases of the gastrointestinal tract, encompassing two main clinical forms: Crohn’s disease (CD) and ulcerative colitis (UC). IBD are thought to be caused by interaction of genetic and environment factors,1 which eventually promotes an abnormal immune reaction direct against components of the luminal flora.2 It is estimated that in Europe alone there are around 2.6 million people suffering from IBD with another approximately 1.2 million in North America.3 Around 25% of the patients are diagnosed before the age of 18 years.4 A curative therapy does not exist and the aim of current treatments is to suppress intestinal inflammation. Despite the therapeutic armamentarium has been expanded in recent years, some IBD patients do not respond to specific drugs or can develop drug-related serious adverse events, thus suggesting the necessity of alternative therapeutic agents.5

In IBD, the pathological process is associated with an extensive mucosal degradation and tissue remodeling, which ultimately favor the development of ulcers, fistulae and strictures. Although the pathogenesis of such lesions is not yet fully understood, a large body of evidence supports the involvement of multiple proteases produced within the inflammatory microenvironment in these processes. One example of such proteases is given by matrix metalloproteinases (MMPs), a group of zinc-dependent neutral peptidases capable of degrading all components of the extra-cellular matrix (ECM).6 MMPs are mostly secreted as latent, inactive zymogens by multiple cell types, including myofibroblasts, T cells, macrophages, monocytes, neutrophils, and epithelial cells. Conversion into active enzyme usually occurs in the pericellular or extracellular space. According to their primary substrate, MMPs can be divided into various subclasses: collagenases (MMP-1, MMP-8, MMP-13 and MMP-18), gelatinases (MMP-2 and MMP-9), stromelysins (MMP-3, MMP-7, MMP-10 and MMP-11), elastase (MMP-12), membrane types (MMP-14, MMP-15, MMP-16, MMP-17, MMP-24 and MMP-25) and others (MMP-19, MMP-20, MMP-23, MMP-26, MMP-27 and MMP-28).7 (Table 1). MMPs act in concert to create a cascade of activation; following activation, one MMP can trigger the conversion of other MMP zymogens to their active forms (Figure 1A), thereby promoting a catalytic cascade with the potential to degrade many components of ECM, such as proteoglycans, collagens, and non-collagenous glycoproteins. For instance, MMP-3 is able to activate pro-MMP-7 (Figure 1B), pro-MMP-9 (Figure 1C) and pro-MMP-13 (Figure 1D). 6

Table 1 Expression and Function of Various Matrix Metalloproteinases in Inflammatory Bowel Disease

Figure 1 Schematic view illustrating how a specific matrix metalloproteinase (MMP) (eg, MMP-3 [A]) triggers the conversion of other MMP zymogens (proMMP-7 [B], proMMP-9 [C], or proMMP-13 [D]) to their active forms.

In physiological conditions, MMPs are produced at very low level and are involved in the normal tissue turnover. Therefore, production, activation and activity of MMPs are tightly regulated in order to prevent excessive tissue degradation. There are at least 4 levels of regulation: at the level of transcription, at the point of activation from the precursor zymogens, by interaction with specific ECM components, and by TIMP inhibition. There are four human TIMPs knew, TIMP-1, TIMP-2, TIMP-3 and TIMP-4. TIMPs do not inhibit all MMPs at the same level; while TIMP-1 inhibits mostly MMP-1 and MMP-3, TIMP-2 suppresses MMP-2 and MMP-9.8,9 TIMP-2 acts also as a positive regulator of MMP-2, given its ability to enhance proMMP-2 activation by MMP-14.10

TIMPs form with MMPs reversible complexes in a 1:1 ratio.11,12 Changes in the production of MMPs and/or TIMPs can result in enhanced MMPs activity and damage. The inhibitory effect of TIMPs on MMPs in normal conditions is illustrated in Figure 2A. Within inflammatory microenvironment, MMP activity cannot be longer controlled by TIMPs as a result of at least 3 different situations: overexpression of MMPs can occur without a parallel increase of TIMPs (Figure 2B); MMP concentration may increase minimally, but this can associate with a sudden decrease in the expression of TIMPs (Figure 2C); increased MMP concentration that is accompanied by concomitant decrease in TIMP levels (Figure 2D).

Figure 2 Schematic view of situations in which MMP is either controlled or not by tissue inhibitors of MMPs (TIMPs). (A) In physiological conditions, TIMPs form with MMPs reversible complexes in a 1:1 ratio thereby controlling MMP activity. Within inflammatory microenvironment, the TIMP/MMP ratio can be decreased by overexpression of MMPs without a parallel increase of TIMPs (B), a sudden decrease in the expression of TIMPs (C) or increased MMP concentration that is accompanied by concomitant decrease in TIMP levels (D).

In this review, we summarized the available data about expression and potential role of MMPs in IBD. In particular, we considered studies investigating gene and protein MMP expression as well as MMP activity in mucosal and blood samples of IBD patients. The reader is direct towards other reviews for data regarding the role of other proteases in IBD and the expression and function of MMPs in murine models of colitis.

Mucosal and Circulating Expression of Metalloproteinases in IBD

A pioneering study by Saarialho-Kere and colleagues documented abundant expression of MMP-1 and MMP-3 RNA in the gastrointestinal tissue around ulcers, including those present in the gut of IBD patients.13 Later on, the same group showed that MMPs are made by different cell types in the gut. Specifically, laminin-5-positive and Ki67-negative enterocytes bordering the ulcerations expressed MMP-10 mRNA, macrophages in the vicinity of shedding mucosal epithelium and beneath the necrotic surface of the ulcers were positive for MMP-12 and fibroblast-like cells in such ulcerations were a source of MMP-13.14 According to that, Dobre et al documented increased RNA MMP-10 expression in inflamed tissue of UC patients.15

Subsequent studies confirmed the greater RNA expression of multiple MMPs in inflamed tissue of both patients with CD and patients with UC as compared to normal and disease (eg, diverticular disease) controls (Table 1). 16 In the pediatric population, MMP-7 expression was more pronounced in active CD than in active UC raising the possibility MMP-7 could help differentiate CD from UC.17,18 Another study in paediatric IBD patients confirmed the increased expression of MMP-7 together with MMP-1, −3, and −10 in gut epithelial cells and lamina propria mononuclear cells (LPMC) of CD and UC.19 Interestingly, MMP-1 levels remained increased in UC patients with endoscopic remission but persistent histological inflammation.20 Further work aimed at assessing the cell source of other MMPs in IBD revealed that MMP-1, MMP-3, and MMP-9 were highly produced by mucosal myofibroblasts21,22 and were also seen in fistulous tracts,23,24 while neutrophils produced MMP-2 and MMP-9.25 In contrast, epithelial cells on the edge of ulcers produce mainly MMP-7.26,27 This latter finding together with data from studies in the airway epithelium28 suggest a role for MMP-7 in re-epithelization after injury. MMP-9 gene and protein expression was particularly increased in patients with extensive UC compared to patients with lesions limited to the left colon or healthy controls.29

IBD are also marked by increased plasma concentration of various MMPs,30,31 even though there is no clear-cut evidence supporting the use of circulating MMP level as an indicator of disease activity.

Altogether, these studies indicate that IBD-related mucosal inflammation associates with enhanced induction of several MMPs.

TIMPs in IBD

TIMP-1 is abundantly expressed by vascular smooth muscle cells and pericytes in the ulcer bases of IBD patients13,32 as well as in inflamed mucosa of both CD patients and UC patients.33 Interestingly, such an increase occurs in IBD mucosal samples exhibiting also elevated activity of MMP-1 and MMP-3, clearly indicating the inability of TIMP-1 to suppress MMPs function.34 Indeed, higher MMP-1/TIMP-1 and MMP-3/TIMP-1 ratios were seen in both CD and UC compared to controls.35 Other studies showed that TIMP-1 levels remained unaltered in biopsy samples of pediatric IBD patients36 or documented low expression of TIMP-1 in IBD.17,24,37 Similarly, conflicting results have been published about the expression of TIMP-2 in IBD with the majority of studies documenting no change in TIMP-2 content in IBD patients compared to controls21,26,35,38,39 and a single study reporting a more pronounced expression of TIMP-2 in both CD patients and UC patients compared to controls.40 TIMP-3 is abundant in the intestinal epithelium of IBD patients.14,16,41

Involvement of MMPs in the Gut Tissue Damage

In a series of elegant studies exploring the contribution of MMPs in the immune cell-mediated gut damage, Pender and colleagues showed that activation of T cells in ex vivo organ cultures of human fetal gut with pokeweed mitogen enhanced expression of MMP-1 and MMP-3 while the concentration of TIMP-1 did not change.38 Pharmacological blockade of MMP-3 prevented the pokeweed mitogen-driven mucosal degradation. Notably, addition of recombinant MMP-3 at nanomolar concentrations (but not MMP-1, MMP-2 or MMP-9) into the organ culture caused tissue destruction thus supporting the pathogenic role of MMPs in such a model of gut damage.

In the fetal gut model, MMPs production was preceded by induction of interferon (IFN)-γ and TNF-α and myofibroblasts located just underneath the epithelium were the major sources of MMPs. Blockade of TNF-α with a soluble p55 TNF receptor-human IgG1 fusion protein reduced the levels of MMP-3 in the culture supernatant and inhibited tissue injury.42 Along the same line was the demonstration that activation of T cells in the fetal gut model with IL-12, a master cytokine over-produced in CD43,44 and stimulating IFN-γ and TNF-α,45,46 induced TNF-driven MMP production and tissue damage.47

The lamina propria cells of activated fetal gut explants express also high levels of MMP-12 RNA.21

Overall, these data indicate that activation of T cells and macrophages in the gut leads to production of inflammatory cytokines, which in turn stimulate both immune and non-immune cells to produce ECM-degrading enzymes. Support to this notion comes from the observation that T cell-specific cytokines, such as interleukin (IL)-17 and IL-21, which are upregulated in active IBD,48–50 induce myofibroblasts to produce MMPs.51–53

Role of MMPs in the Nonresponsiveness of Patients with IBD to Anti-TNF Agents

Agents blocking TNF-α represent one of the major therapeutic options for IBD patients, but not all the commercial compounds exhibit similar efficacy. In particular, infliximab and adalimumab, which are monoclonal IgG1 antibodies, are effective in inducing and maintain remission in both CD and UC, even though more than one-third of the patients are primarily unresponsive to these drugs or lose the response over time.54 In contrast, etanercept, a dimeric p75 TNF receptor-IgG Fc fusion protein, is not beneficial in CD.55 By incubating infliximab, adalimumab and etanercept with mucosal homogenates from IBD patients or activated recombinant human MMP-3 or MMP-12, Biancheri and colleagues showed that MMPs cleaved all the 3 TNF blockers.56 However, after MMP degradation, infliximab and adalimumab functioned as F(ab’)2 fragments, whereas cleaved etanercept lost its TNF-neutralization ability. These data could, thus, provide the biological explanation of the different effectiveness of the 3 compounds in IBD. Notably, serum samples of IBD patients who did not respond to anti-TNF therapy contain higher levels of MMP3-/MMP12-cleaved endogenous IgG than those measured in responders suggesting that proteolytic degradation occurring in inflamed gut may be a novel mechanism affecting the bioavailability of TNF blockers and contributing to primary nonresponsiveness in IBD. Further experimentation is needed to confirm these data and ascertain whether other MMPs exert similar effects.

Potential Use of MMPs Inhibitors in IBD

There is no doubt that, in IBD, the excessive immune response associates with abnormal production of several MMPs and altered MMPs/TIMPs ratios. Functional studies support strongly the involvement of MMPs in the IBD-related mucosal degradation. Indeed, in the last 2 decades, several inhibitors of MMPs have been developed and used to attenuate gut inflammation in animal models of IBD. For instance, administration of the MMP inhibitor, marimastat, to rats with TNBS-colitis reduced clinical and inflammatory scores of colitis.57 In the same animal model, similar results were seen following treatment with the MMP inhibitor batimastat.58 O’Sullivan and colleagues showed that rectal administration of the dinitrate-barbiturate, a barbiturate-based MMP inhibitor incorporating a nitric oxide donor/mimetic group, to rats with dextran-sulfate sodium (DSS) colitis inhibited the induction and activity of MMP-9 and attenuated the ongoing colitis.59 These data have paved the way for the development of compounds to use in the clinic. So far, 3 clinical trials with MMP inhibitors have been performed in IBD. A Phase 1 trial investigating the safety and efficacy of GS‐5745 (andecaliximab), a fully humanized high‐affinity IgG4 monoclonal antibody that selectively binds and inhibits MMP-9, in moderately-to-severe active UC showed promising results.60 Seventy-four patients with UC were randomized to receive single or multiple ascending intravenous (0.3, 1.0, 2.5 or 5.0 mg/kg) every 2 weeks (three total infusions) or 5 weekly subcutaneous doses (150 mg) of GS-5745 or placebo. Overall, the drug was safe, and clinical response occurred in 43% of the patients receiving GS-5745 compared with 13% of patients receiving placebo. However, these encouraging results were not confirmed by a Phase 2/3 trial, in which eight weeks of induction treatment with GS-5745 induced rates of clinical response or remission similar to those seen in the placebo group.61 GS-5745 has also been tested in a phase 2 trial in patients with moderate-to-severe CD. Unfortunately, 8 weeks of induction treatment did not lead to symptomatic or endoscopic response.62 Taken together these findings would seem to indicate that MMP-9 does not play a pathological role in IBD. However, in this context, it is noteworthy GS-5745 has higher affinity for proMMP-9 than active MMP-963 and therefore it might inhibit only partially MMP-2 in the gut. This is supported by the demonstration that, in the phase 1 study, patients with a clinical response to GS-5745 had only partial reductions in MMP-9 tissue levels. Since some MMPs have redundant functions and many of them are activated simultaneously during the active phases of the disease, it remains also plausible that blockade of a single MMP (eg, with GS-5745) can have no impact on the mucosal damage.

Conclusions

In this review, we summarized the available evidence on the expression and potential role of MMPs in IBD. The majority of the presented studies indicate that IBD-related inflammation is associated with increased expression of MMPs and a decreased capacity of TIMPs to inhibit their action. Furthermore, circumstantial evidence suggests that MMP induction relies on the activity of various inflammatory cytokines, which are over-produced in IBD tissue. Interestingly, some studies suggested that MMP-3 and MMP-12 activity may affect the bioavailability of anti-TNF agents and be responsible for non-responsiveness to these drugs in some patients. Despite the strong evidence implicating MMPs in IBD pathogenesis, clinical trials using MMPs inhibitors showed disappointing results. Further clinical studies are, however, needed to ascertain whether such drugs can be helpful in specific subgroup of patients (eg, fistulizing/fibrostricturing CD).

Acknowledgment

Figures were created with BioRender.com.

Author Contributions

All authors made a significant contribution to the work reported, whether that is in the conception, study design, execution, acquisition of data, analysis and interpretation, or in all these areas; took part in drafting, revising or critically reviewing the article; gave final approval of the version to be published; have agreed on the journal to which the article has been submitted; and agree to be accountable for all aspects of the work.

Funding

This work was supported by the Slovak Research and Development Agency under the contract no. APVV-17-0505.

Disclosure

The authors declared no conflicts of interest in this work.

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