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doi: 10.1242/10.1242/jcs.00063

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Metalloproteinase inhibitors: biological actions and therapeutic opportunities

Andrew H. Baker¹, Dylan R. Edwards² and Gillian Murphy^2,*,

¹ BHF Blood Pressure Group, Department of Medicine and Therapeutics, Western Infirmary, Glasgow G11 6NT, UK
² School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK
^* Present address: Department of Oncology, Cambridge University, Institute for Medical Research, Hills Road, Cambridge CB2 2XY, UK

Author for correspondence (e-mail: gm290{at}cam.ac.uk)

	Summary

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
Tissue inhibitors of metalloproteinases (TIMPs) are the major cellular inhibitors of the matrix metalloproteinase (MMP) sub-family, exhibiting varying efficacy against different members, as well as different tissue expression patterns and modes of regulation. Other proteins have modest inhibitory activity against some of the MMPs, including domains of netrins, the procollagen C-terminal proteinase enhancer (PCPE), the reversion-inducing cysteine-rich protein with Kazal motifs (RECK), and tissue factor pathway inhibitor (TFPI-2), but their physiological significance is not at all clear. 2-Macroglobulin, thrombospondin-1 and thrombospondin-2 can bind to some MMPs and act as agents for their removal from the extracellular environment. In contrast, few effective inhibitors of other members of the metzincin family, the astacins or the distintegrin metalloproteinases, ADAMs have been identified.

Many of these MMP inhibitors, including the TIMPs, possess other biological activities which may not be related to their inhibitory capacities. These need to be thoroughly characterized in order to allow informed development of MMP inhibitors as potential therapeutic agents. Over activity of MMPs has been implicated in many diseases, including those of the cardiovascular system, arthritis and cancer. The development of synthetic small molecule inhibitors has been actively pursued for some time, but the concept of the use of the natural inhibitors, such as the TIMPs, in gene based therapies is being assessed in animal models and should provide useful insights into the cell biology of degradative diseases.

Key words: MMP, TIMP, RECK, Therapy

	Introduction

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
Metalloproteinases (MPs) play key roles in the responses of cells to their microenvironment. By effecting proteolytic degradation or activation of cell surface and extracellular matrix (ECM) proteins they can modulate both cell-cell and cell-ECM interactions, which influence cell differentiation, migration, proliferation and survival. Both secreted and membranebound forms of metalloproteinases have been implicated in pericellular proteolysis, including the matrix metalloproteinases (MMPs), the adamalysin-like proteinases with both metalloproteinase and disintegrin-like domains (ADAMs and their counterparts that have a thrombospondin-1-like domain, ADAM-TSs) and the astacins (Werb, 1997). Cells use various strategies to regulate extracellular proteinases: transcriptional regulation, trafficking of membrane-bound forms (secretion and endocytosis), activation of latent proenzyme forms, extracellular binding proteins and the action of endogenous inhibitors. Here we will discuss the role of metalloproteinase inhibitors, from the well-known tissue inhibitors of metalloproteinases (TIMPs) and 2-macroglobulin through to newer and less well-understood putative inhibitors (Fig. 1). We look at the available evidence that their other roles in cell biology do not all relate to their metalloproteinase inhibitory activity. Finally, we discuss the potential for use of such natural metalloproteinase inhibitors as therapeutic agents.

View larger version (32K): [in this window] [in a new window]   Fig. 1. Metalloproteinase inhibitors in the pericellular environment. (A) Tissue inhibitors of metalloproteinases (TIMPs). TIMPs-1-4 are largely matrix metalloproteinase (MMP) inhibitors modulating the activity of soluble, matrix bound and cell associated MMPs. TIMP-3 is an extracellular matrix protein, probably bound to heparan sulphate proteoglycans and is a potential inhibitor of the function of some membrane-associated ADAM s (a disintegrin and a metalloproteinase), as well as the matrix-associated ADAM-TS (ADAM-thrombospondins, not shown). TIMP-2 acts in conjunction with MT1-MMP as a receptor for the pro-form of MMP-2 at the cell surface, allowing an efficient activation and focussing of the active form of this soluble proteinase. In some cell types, TIMP-1 and TIMP-2 may have receptors directly linked to intracellular signalling pathways regulating cell behaviour. (B) Other inhibitors. RECK (reversion inducing cysteine rich protein with Kazal motifs) is a GPI-anchored glycoprotein that binds and inhibits a number of MMPs. The pan proteinase inhibitor 2-macroglobulin, although very large, has some access to the pericellular space in vascularised tissues and may be involved in MMP endocytosis through the low density lipoprotein receptor-related protein (LDL-RP). The roles of the LDL-RP in MMP2 removal via a thrombospondin-2 (TSP-2) complex and in direct MMP9 removal have been described. The tissue factor pathway inhibitor (TFPI-2) has also been described as an MMP binding agent

	Tissue inhibitors of metalloproteinases (TIMPs): basic structure and activity

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
Four mammalian TIMPs have been cloned, purified and characterised. These secreted proteins are thought to regulate MMP activity during tissue remodelling. One TIMP gene has been identified in Drosophila, and its ablation generates a phenotype similar to that of integrin mutants, which indicates that it has a role in ECM function (Godenschwege et al., 2000). All four mammalian TIMPs have many basic similarities, but they exhibit distinctive structural features, biochemical properties and expression patterns (Table 1). This suggests that each TIMP has specific roles in vivo. As in Drosophila, the mammalian TIMP genes are embedded intragenically in intron 5 of synapsin genes (Edwards, 2000).

The TIMPs have molecular weights of 21 kDa and are variably glycosylated (Table 1). They have six disulphide bonds and comprise a three-loop N-terminal domain and an interacting three-loop C-subdomain. Most of the biological functions of these proteins discovered thus far are attributable to sequences within the N-terminal domain, although the C-subdomains mediate interactions with the catalytic domains of some MMPs and with the hemopexin domains of MMP-2 and MMP-9 (Brew et al., 2000). The TIMPs are secreted proteins, but may be found at the cell surface in association with membrane-bound proteins; for example, TIMP-2, TIMP-3 and TIMP-4 could bind MMP-14, a membrane-type (MT) MMP. Uniquely, TIMP-3 is sequestered to the ECM by binding to heparan-sulphate-containing proteoglycans and possibly chondroitin-sulphate-containing proteoglycans (Yu et al., 2000). All four TIMPs inhibit active forms of all MMPs studied to date, their binding constants being in the low picomolar range, although TIMP-1 is a poor inhibitor of MMP-19 and a number of the MT-MMPs (Table 1). TIMPs have no significant activity against the astacins (J. Bond, personal communication), but some activity of TIMP-3 (and to some extent TIMP-1) against the ADAMs has been shown. TIMP-3 inhibits ADAM 12 and ADAM 17 and the aggrecan-degrading enzymes ADAM-TS4 and ADAM-TS5, and TIMP-1 inhibits ADAM 10. Here, dissociation constants are in the subnanomolar range (Amour et al., 2000; Amour et al., 1998; Kashiwagi et al., 2001).

	Phenotypic effects of TIMPs

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
TIMPs have effects on cell growth and survival that cannot always be clearly reconciled with their ability to abrogate MMP activity. TIMP-1 was first identified as an erythroid potentiating activity (Gasson et al., 1985) and subsequently as an agent that stimulates growth of some cell lines (Bertaux et al., 1991; Hayakawa et al., 1992). TIMP-2 also has erythroid potentiating activity (Stetler-Stevenson et al., 1992) and stimulates the growth of lymphoma cells (Hayakawa et al., 1994) and fibroblasts (Corcoran and Stetler-Stevenson, 1995); in addition, it might be comitogenic with insulin (Nemeth et al., 1996). Point mutations of the TIMP-1 MMP-inhibitory domain uncouple MMP inhibition and erythroid precursor growth stimulation (Chesler et al., 1995). Moreover, recently Sobue et al., showed that both TIMP-1 and TIMP-2 stimulate the bone-resorbing activity of osteoclasts through tyrosine kinase and MAP kinase pathways, and that synthetic MMP inhibitors do not have this effect. (Sobue et al., 2001). TIMP-1 binds to the cell surface of MCF-7 breast carcinoma cells (Ritter et al., 1999) and is translocated to the nucleus, although no receptor or distinct function of nuclear-localised TIMP-1 has yet been identified. Accumulation of TIMP-1 in the nuclei of gingival fibroblasts had previously been shown to be maximal in S phase of the cell cycle (Li et al., 1995).

TIMP-2 is thought to act through specific, saturable high-affinity receptors (K_d 0.15 nM) and links to G protein and cAMP signalling pathways (Corcoran and Stetler-Stevenson, 1995). Since reduced and alkylated TIMP-2 is mitogenic (Hayakawa et al., 1994) and an inactive mutant that has an additional N-terminal alanine residue promotes fibroblast growth (Wingfield et al., 1999), these activities are probably distinct from its ability to inhibit MMPs. Importantly, some TIMPs are associated with the tumour progression (Grignon et al., 1996; Jiang et al., 2001; Kossakowska et al., 1991; Stetler-Stevenson et al., 1997), although, paradoxically, others suppress tumour formation (Ahonen et al., 1998; Baker et al., 1999; Bian et al., 1996; Edwards et al., 1996) (Table 1). TIMPs also have divergent effects on programmed cell death. In Burkitt's lymphoma cell lines, high TIMP-1 expression correlates with the increased expression of activation and survival markers, and TIMP-1 confers resistance to Fas-ligand-dependent and -independent apoptosis (Guedez et al., 1998). Conversely, TIMP-2 can promote apoptosis in an in vivo colorectal cancer model (Brand et al., 2000) but protects B16 melanoma cells from apoptosis (Valente et al., 1998). High levels of TIMP-3 promote apoptosis in many cell types in vitro and in vivo (Ahonen et al., 1998; Baker et al., 1998; Bond et al., 2000; Smith et al., 1997; Yang and Hawkes, 1992), and this effect is associated with death receptor modulation (Bond et al., 2002; Smith et al., 1997). It is not clear whether TIMP-3-induced apoptosis has any physiological parallel. In normal development, high-level TIMP-3 expression occurs in uterine decidual cells during embryo implantation and has been linked with the survival of these differentiated cells (Alexander et al., 1996). TIMP-4 can also instigate apoptosis in transformed cardiac fibroblasts but inhibits apoptosis in human breast cancer cells in vitro and mammary tumours in vivo; it is thus a tumour promoter when overexpressed. The elucidation of the mechanisms involved in controlling these distinctly opposing phenotypic effects of TIMPs is of paramount importance if we are to understand TIMP biology and assess the potential therapeutic roles of these proteins (see below).

	TIMP-knockout phenotypes

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
Knockout mouse studies have addressed the biological roles of TIMPs (reviewed by Coussens et al., 2001). To date, TIMP-1^-/-, TIMP-2^-/- and TIMP-3^-/- mice have been described. All of these are viable and fertile, although the fertility and reproductive lifespan of female TIMP-1-null mice are reduced (Nothnick, 2001). Mice lacking TIMP-3 show spontaneous lung airspace enlargement by 2 weeks after birth, which progresses until the animals become moribund shortly after 1 year (Leco et al., 2001). This emphysema-like phenotype correlates with disturbance of the MMP/TIMP balance, which leads to increased collagen turnover in the alveolar interstitium. TIMP-3^-/- mice also show accelerated mammary epithelial apoptosis during post-lactation involution of the gland (Fata et al., 2001). In TIMP-2^-/- mice the only phenotype that has been remarked upon is impairment of pro-MMP-2 activation (Caterina et al., 2000; Wang et al., 2000), which reflects the unique role that TIMP-2 has in cell surface activation of pro-MMP-2 by MT1-MMP (Bigg et al., 2001; Toth et al., 2000). In the mouse, MMP-2 is dispensable for normal development, although there is reduced growth and vascularization of transplanted tumours in MMP-2-null host mice (Itoh et al., 1998). However, mis-sense mutations in the human MMP-2 gene give rise to multicentric osteolysis and arthritis (Martignetti et al., 2001), and so it is possible that disruption of the TIMP-2 gene may likewise have more extensive effects in human. A curious aspect of the TIMP-1^-/- mice is their increased resistance to infection by Pseudomonas aeruginosa, which has been linked with increased inflammatory and complement-dependent immune responses (Coussens et al., 2001). Upregulated production of TIMPs could be a factor in various fibrotic diseases but neither TIMP-1^-/- mice nor TIMP-2^-/- mice show differences in hepatic fibrosis following Schistisoma parasite infection (Vaillant et al., 2001). TIMP-1-null mice also show no change in renal fibrosis induced by unilateral ureteral obstruction (Kim et al., 2001). However, the issue of compensation by altered MMP/TIMP expression needs to be addressed comprehensively in these systems.

	TIMP-like molecules

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
A number of proteins contain sequences with some similarity to the N-terminal sequence of the TIMPs, including the netrins, secreted frizzled-related proteins and type I collagen C-proteinase enhancer protein (PCPE) (reviewed by Banyai and Patthy, 1999), and might act as MMP inhibitors. Tissue factor pathway inhibitor 2 (TFPI-2), a serine proteinase inhibitor, also has an internal region that has some sequence similarity to the TIMPs and inhibits MMP-1, MMP-2, MMP-9 and MMP-13. TFPI-2 appears to bind and co-precipitate with the MMPs, including proMMP-2, and hence it may act by a sequestration mechanism (Herman et al., 2001). The importance of these interactions in cell biology has not yet been studied. None is likely to act by a mechanism directly analogous to that of a TIMP, because a critical feature of the latter is the liganding of the Zn²⁺ ion at the active site by the free amino group of the N-terminal cysteine residue (Gomis-Ruth et al., 1997). The NC1 domain of type IV collagen weakly inhibits MMP-2 and MMP-3, but this is unlikely to be physiological.

Thrombospondin-2 is another MMP inhibitor. It can regulate MMP-2 by forming a complex that facilitates scavenger-receptor-mediated endocytosis. Similarly, thrombospondin-1 has been shown to inhibit proMMP-2 and proMMP-9 activation and modulate MMP-2 production (Egeblad and Werb, 2002).

	2-macroglobulin

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
The plasma proteinase inhibitor 2-macroglobulin is a 772 kDa protein comprising four nearly identical, disulphide-bonded domains. It is synthesised mainly in the liver by hepatocytes, but production by some other cell types (e.g. macrophages) has also been described. 2-macroglobulin can almost universally inhibit endoproteinases, including the MMPs and the ADAMs, but does not inhibit astacins. Inhibition is effected by a novel mechanism involving the presentation of a cleavable `bait' region that, once proteolytically cleaved, causes a conformational change that entraps the proteinase, which becomes covalently anchored by transacylation. 2-macroglobulin has proved to be a useful tool for the identification of proteolytic activity in less well-characterised proteinases: one can simply look for the formation of a covalent complex (Nagase, 1997). Although some TIMPs are also present in plasma, 2-macroglobulin can be regarded as the major plasma inhibitor of metalloproteinases. However, its role and importance in the regulation of the pericellular function of metalloproteinases is still a matter of debate. 2-Macroglobulin-serine-proteinase complexes have long been known to be associated with the 2-macroglobulin receptor, the low density lipoprotein receptor-related protein (LDL-RP) prior to internalisation and degradation (Moestrup et al., 1993), and it is likely that MMPs could be similarly removed. However, Barmina et al., have shown that MMP-13 associates with the LDL-RP through a specific receptor on osteoblastic cells, leading to internalisation (Barmina et al., 1999). More recently, Hahn-Dantona et al., showed that MMP-9 and its TIMP-1 complex can be internalised by binding to LDL-RP (Hahn-Dantona et al., 2001). 2-macroglobulin also has a variety of effects that do not directly relate to its ability to inhibit proteinases. These include binding to TGFß and cytokines (Armstrong and Quigley, 1999).

	Reversion inducing cysteine-rich protein with Kazal motifs: RECK

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
The RECK gene is expressed by v-Ki-Ras-transformed NIH 3T3 cells during the induction of a flat morphology. It encodes a 110 kDa glycoprotein that contains serine-proteinase-inhibitor-like domains and associates with the cell membrane through a GPI anchor (Takahashi et al., 1998). RECK is widely expressed in human tissues, but its levels appear to be low in many tumour-derived cell lines. Overexpression of RECK in such lines resulted in a downregulation of MMP-9 at an unidentified post-transcriptional level. Concomitantly, the invasive potential of the cells decreased. RECK also inhibited the cellular activation of proMMP-2 beyond the MT1-MMP-generated activation intermediate, which is thought to be an autoproteolytic step (Butler et al., 1998). Soluble recombinant RECK is a moderately weak inhibitor of MMP-2, MMP-9 and a soluble form of MT1-MMP, but its activity against serine proteinases has not been studied as yet. Its importance is emphasised by the study of ablation of the gene in mice (Oh et al., 2001). RECK^-/- embryos die at E10.5 and show severe disruption of mesenchymal tissues and organogenesis. Notably, vascular endothelial cells in these mice do not form tight tubules, which suggests that they have a defect in vessel maturation. Since MMP-2 and MT1-MMP are expressed at this stage, their dysregulation could be responsible for the phenotype. Alternatively, RECK might have other functions that have not been elucidated. Indeed, RECK^-/-MMP-2^-/- double-knockout mice survive to E11.5, are larger than RECK^-/- mice and exhibit improved vascular development. In a tumour model in which Oh et al., injected HT 1080 cells overexpressing RECK subcutaneously into nude mice, tumour angiogenesis was compromised (Oh et al., 2001). The sprouting stage of angiogenesis appeared to be impaired but lumenal growth continued, yielding a few vessels with wide lumens and extensive tumour cell death. Note that ablation of any of the TIMP genes has very little effect on embryonic development. Since RECK is cell associated, it could function in a much more specific and directed way. However, at this stage, it is prudent to suggest that RECK has other biological properties that remain to be elucidated.

	Development of TIMPs as therapeutic molecules

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
Although it is now clear that TIMPs are multifunctional proteins that possess both mainstream (but differing) MP-inhibitory activities and divergent other functions, their attributes may be exploited in the search for novel therapies. The current trend of seeking to readdress the MP:TIMP balance to block or reverse disease progression involves either inhibition of MMP activity by small molecule drugs or increasing the local concentration of TIMPs by recombinant protein administration or gene transfer. The majority of clinical trials using synthetic MP inhibitors (MPI) have proven disappointing, principally owing to lack of efficacy and untoward side effects. However, note that in animal models MP inhibitors are most effective in preventing growth and vascularisation of pre-malignant tumours and are relatively ineffective against advanced disease (Bergers et al., 1999). Hence, their poor performance is, in retrospect, unsurprising given the design of the trials that have been undertaken to date (Brown, 2000; Coussens et al., 2002), many of which involved the use of MMP inhibitors as single agent therapies for patients with advanced disease. Recently however, survival benefits are being detected in some trials, including a phase II study of marimastat in advanced pancreatic cancer (Evans et al., 2001) and a phase III gastric cancer study (Bramhall et al., 2002). This suggests that, when we know more about the precise roles of MPs in tumour progression, these compounds may be of clinical value. Despite setbacks the basic principle of therapeutic MP inhibition remains intact and is applicable to diverse diseases, including cardiovascular disease and cancer. The rational design and evaluation of more selective synthetic inhibitors may be one route to efficacious therapies. However, recent evidence in pre-clinical studies suggests that gene-based therapy using TIMPs may have broad clinical potential.

	MMP blockade and cardiovascular disease

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
Deregulation of MMPs has been implicated in diverse cardiovascular diseases, acute and chronic. These include atherosclerosis (George, 1998), myocardial infarction and heart failure (Creemers et al., 2001), development and rupture of aneurysms (Pyo et al., 2000), restenosis following balloon angioplasty (Bendeck et al., 1994; Zempo et al., 1994) and the failure of vein grafts following coronary artery bypass graft failure (George et al., 1997). Given the predicted involvement of MMPs in this range of cardiovascular events, many of which lack suitable surgical or pharmacological treatments, intense research has focused on blockade of MP activity. However, certain applications are more realistic than others. Chronic, progressive conditions such as atherosclerosis would require long-term administration of MP inhibitors to prevent disease progression or ideally reverse it. A short-term study using TIMP-1 in a pre-clinical model of atherosclerosis demonstrated this proof of concept (Rouis et al., 1999). Following systemic adenovirus administration, ectopic TIMP-1 reduced the severity of atherosclerosis relative to controls. The limitation, however, was the transient nature of adenovirus-mediated gene transfer, and thus long-term gene therapy studies are required. Paradoxically, atherosclerotic apoE^-/- mice exhibit a reduction in atherosclerotic lesion size when crossed with TIMP-1^-/- mice compared with controls (although the incidence of aneurysm increased). We must therefore define fully the underlying complexity of the MP:TIMP system in the development of atherosclerosis (Silence et al., 2002).

Many MPI studies have been performed in acute cardiovascular complaints, particularly restenosis and vein graft failure. These applications offer the opportunity to prevent disease progression in a time frame that is applicable to the current technologies available to gene therapists, by high-level transient TIMP overexpression locally within the vasculature. Post-balloon angioplasty procedures (although dwindling in frequency owing to use of stents, which act as scaffolds to hold arteries open) were an obvious target for TIMP gene therapy. MPs were envisaged to play an integral role in the pathological development of restenotic lesions, which are mediated by the proliferation and migration of vascular smooth muscle cells (Bendeck et al., 1994; Southgate et al., 1996; Zempo et al., 1994). However, small molecule MMP inhibitors fail to prevent restenosis, even though they efficiently block early smooth muscle cell migration (Bendeck et al., 1996). Recently, the broad spectrum MP inhibitor RO113-2908 failed to prevent angioplasty- or stent-induced intermal hyperplasia over 4 weeks in atherosclerotic primates (Cherr et al., 2002), although MP inhibitors do reduce constrictive remodeling in a porcine angioplasty model (de Smet et al., 2000). Similarly, TIMP overexpression (Cheng et al., 1998; Dollery et al., 1999; Forough et al., 1996) prevented smooth muscle cell migration but long-term benefits were not fully established. Vein graft failure, in common with restenosis, involves smooth muscle cell migration and proliferation as a central mechanism, and increased MP synthesis and activation have been observed in appropriate models (George et al., 1997; Southgate et al., 1999). Local overexpression of TIMPs (TIMP-1, TIMP-2 or TIMP-3) in a human vein graft model prevented MMP-induced neointima formation (George et al., 1998a; George et al., 1998b; George et al., 2000). In vivo, overexpression of TIMP-3, but not other TIMPs, significantly inhibited disease progression through its ability to promote apoptosis (George et al., 2000). This is an important demonstration of how unique attributes of individual TIMPs can be used to therapeutic advantage.

	Cancer

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
Cancer is another major clinical condition in which the use of MMP inhibitors is under investigation. Descriptive and intervention studies have defined the potential importance for MMPs in all major facets of cancer progression, including tumour growth, invasion and extravasation into distant sites, and the angiogenic effect required to nourish new tumour formation (Coussens et al., 2002; Egeblad and Werb, 2002). Many studies have attempted to correlate MMP and TIMP expression with tumour type and grade. Although there is distinct heterogeneity in the findings for different cancers (reviewed by Egeblad and Werb, 2002), the majority of studies underscore the potential feasibility for MP inhibition as a route to cancer therapy. Important early studies used recombinant TIMPs or basic gene transfer systems (plasmids or retroviruses) and demonstrated that inhibition of MPs by TIMP blocks both tumour growth and local invasion through extracellular matrices. However, as discussed previously, the use of MP inhibitors in clinical trials has proven largely disappointing, which highlights several key points. First, more selective inhibitors that block the functions of specific MPs involved in key steps in tumour progression are required. This is important because some MPs might act to limit tumour growth and metastasis through local production of angiogenesis-suppressing molecules such as angiostatin and endostatin or other factors that have negative effects on tumour growth (Coussens et al., 2002). Second, it is likely that MP inhibition alone is insufficient for treatment of late-stage disease and there is a need to consider the use of MPIs in patients who have early disease or after surgical debulking and in concert with other treatments. Third, localised MMP inhibition may be a pre-requisite to achieving efficacy. Although the results of long-term studies using selective MP inhibitors are eagerly awaited, TIMPs offer the opportunity to provide localised therapy, particularly using gene transfer technology. Since TIMPs are secreted they have a profound bystander effect, causing phenotypic modulation of cells that are not transduced directly by the gene delivery vector. This advantage over intracellular or cell-surface-associated transgenes may compensate for the low percentage of cells-transducted by certain vector systems. There are now many studies demonstrating pre-clinical efficacy for overexpression of TIMPs to prevent the growth and/or spread of cancers as well as protecting normal, non-cancerous tissue, from metastases that would normally form in the targeted tissue (Brand et al., 2000).

There are, however, safety issues relating to the biological effects of TIMPs and, in particular, their growth promoting activity. This paradigm is highlighted by two recent studies. First, Celiker et al. delivered a DNA plasmid encoding TIMP-4 via intra muscular injection into nude mice with tumours derived from G401 Wilm's tumor cells. They observed a significant reduction in tumour growth through the elevation of circulating TIMP-4 and uptake of the transgene into tumour cells. These effects were observed at TIMP-4 levels below the level required for MMP inhibition (Celiker et al., 2001). However, when the same transgene, route of delivery and nude mouse model were used to investigate breast cancer growth, TIMP-4 stimulated tumorigenesis through an MMP-independent anti-apoptotic activity (Jiang et al., 2001). Clearly different cancers were under investigation but the antiapoptotic/pro-survival effects of TIMPs have also been defined for TIMP-1 in B-cell lymphoma (Guedez et al., 1998) and Hodgkin/Reed-Sternberg cells (Oelmann et al., 2002).

The biological characteristics of TIMP-3 have also been exploited in cancer gene therapy (Fig. 2). As previous studies have shown, TIMP-3 inhibits local invasion of cancer cells, promotes apoptosis, inhibits angiogenesis (Anand-Apte et al., 1997) and binds locally to the ECM (Leco et al., 1994), which suggests that overexpression of TIMP-3 is a rational multiphenotypic approach for localised destruction of cancerous tissue. Indeed, a recent study has demonstrated this potential (Ahonen et al., 2002). TIMP-3 overexpression in melanomaderived subcutaneous tumours in nude mice reduced gelatinolytic MMP activity, reduced blood vessel density, promoted apoptosis and significantly reduced tumour growth. Importantly, in side-by-side comparative studies, TIMP-3 overexpression was significantly better than overexpression of p53 (Ahonen et al., 2002). Such studies use the attributes of individual TIMP molecules to therapeutic benefit and may, in the longer term, show promise for cancer gene therapy in the clinic.

View larger version (33K): [in this window] [in a new window]   Fig. 2. Mechanistic aspects of TIMP-3 gene therapy. Highly efficient replication-deficient adenoviral vectors engineered to express TIMP-3 infect cells through receptor-mediated endocytosis, traffic to the nucleus and use the host DNA machinery to transcribe and secrete TIMP-3. Recombinant TIMP-3 binds the ECM where it initiates its desired phenotypic effects on cells (indicated by 1-3 in green). TIMP-3 overexpression is associated with anti-angiogenic activity (1), reduction in cell migration and invasion (2) and initiation of apoptosis (3), mediated through modulation of MP activity. The induction of apoptosis occurs though modulation in death receptor/death ligand activity at the cell surface resulting in activation of caspases (in blue). Apoptosis is mediated through a type-2-dependent pathway involving caspase-8, -9 and -3 as well as mitochondrial components. Ultimately, caspase-3-mediated cleavage of death substrates leads to apoptosis.

	Concluding remarks

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 
Together these findings illustrate that, of the known natural MMP inhibitors, TIMPs possess proteinase inhibitory properties that may be exploited for therapeutic benefit in diverse pathologies. However, caution will need to be exercised until the other biological activities of the TIMPs are fully understood, because they could have unwanted side effects. Although some clinical studies using broad spectrum MP inhibitors have drawn disappointing conclusions, further research on more selective MP inhibitors and TIMPs in appropriate target disease is warranted to define the therapeutic potential of these molecules, as well as to elucidate their varied mechanisms of action. The potential for RECK, or parts of the RECK molecule, to be used as therapeutic agents is currently not known, but will be clearly the subject of future work.

	Acknowledgments

 
We apologise that, owing to space limitations, we could not cite the primary references for all the work discussed. The authors' laboratories are funded by the Medical Research Council, the Wellcome Trust, Cancer Research UK, British Heart Foundation and the Arthritis Research Campaign, arc, UK.

	References

Top Summary Introduction Tissue inhibitors of... Phenotypic effects of TIMPs TIMP-knockout phenotypes TIMP-like molecules {alpha}2-macroglobulin Reversion inducing cysteine-rich... Development of TIMPs as... MMP blockade and cardiovascular... Cancer Concluding remarks References

 

Ahonen, M., Baker, A. H. and Kahari, V. M. (1998). Adenovirus-mediated gene delivery of tissue inhibitor of metalloproteinases-3 inhibits invasion and induces apoptosis in melanoma cells. Cancer Res. 58,2310 -2315.[Abstract/Free Full Text]

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				L. Gillet, S. Roger, P. Besson, F. Lecaille, J. Gore, P. Bougnoux, G. Lalmanach, and J.-Y. Le Guennec Voltage-gated Sodium Channel Activity Promotes Cysteine Cathepsin-dependent Invasiveness and Colony Growth of Human Cancer Cells J. Biol. Chem., March 27, 2009; 284(13): 8680 - 8691. [Abstract] [Full Text] [PDF]

				P. Boutet, S. Aguera-Gonzalez, S. Atkinson, C. J. Pennington, D. R. Edwards, G. Murphy, H. T. Reyburn, and M. Vales-Gomez Cutting Edge: The Metalloproteinase ADAM17/TNF-{alpha}-Converting Enzyme Regulates Proteolytic Shedding of the MHC Class I-Related Chain B Protein J. Immunol., January 1, 2009; 182(1): 49 - 53. [Abstract] [Full Text] [PDF]

				M. Claudino, A. P. F. Trombone, C. R. Cardoso, S. B. Ferreira Jr, W. Martins Jr, G. F. Assis, C. F. Santos, P. C. Trevilatto, A. P. Campanelli, J. S. Silva, et al. The broad effects of the functional IL-10 promoter-592 polymorphism: modulation of IL-10, TIMP-3, and OPG expression and their association with periodontal disease outcome J. Leukoc. Biol., December 1, 2008; 84(6): 1565 - 1573. [Abstract] [Full Text] [PDF]

				H. Kang, K. J. Bayless, and R. Kaunas Fluid shear stress modulates endothelial cell invasion into three-dimensional collagen matrices Am J Physiol Heart Circ Physiol, November 1, 2008; 295(5): H2087 - H2097. [Abstract] [Full Text] [PDF]

				W. G. Stetler-Stevenson Tissue Inhibitors of Metalloproteinases in Cell Signaling: Metalloproteinase-Independent Biological Activities Sci. Signal., July 8, 2008; 1(27): re6 - re6. [Abstract] [Full Text] [PDF]

				K.-H. Kang, S.-Y. Park, S. B. Rho, and J.-H. Lee Tissue inhibitor of metalloproteinases-3 interacts with angiotensin II type 2 receptor and additively inhibits angiogenesis Cardiovasc Res, July 1, 2008; 79(1): 150 - 160. [Abstract] [Full Text] [PDF]

				G. Cai, X. Zhang, Q. Hong, F. Shao, X. Shang, B. Fu, Z. Feng, H. Lin, J. Wang, S. Shi, et al. Tissue inhibitor of metalloproteinase-1 exacerbated renal interstitial fibrosis through enhancing inflammation Nephrol. Dial. Transplant., June 1, 2008; 23(6): 1861 - 1875. [Abstract] [Full Text] [PDF]

				P. Chen, J. K. McGuire, R. C. Hackman, K.-H. Kim, R. A. Black, K. Poindexter, W. Yan, P. Liu, A. J. Chen, W. C. Parks, et al. Tissue Inhibitor of Metalloproteinase-1 Moderates Airway Re-Epithelialization by Regulating Matrilysin Activity Am. J. Pathol., May 1, 2008; 172(5): 1256 - 1270. [Abstract] [Full Text] [PDF]

				K Bodger, S Ahmed, L Pazmany, D M Pritchard, A Micheal, A L Khan, R Dimaline, G J Dockray, and A Varro Altered gastric corpus expression of tissue inhibitors of metalloproteinases in human and murine Helicobacter infection J. Clin. Pathol., January 1, 2008; 61(1): 72 - 78. [Abstract] [Full Text] [PDF]

				J. Deguara, K. G. Burnand, J. Berg, P. Green, C. M. Lewis, G. Chinien, M. Waltham, P. Taylor, R. F. Stern, E. Solomon, et al. An increased frequency of the 5A allele in the promoter region of the MMP3 gene is associated with abdominal aortic aneurysms Hum. Mol. Genet., December 15, 2007; 16(24): 3002 - 3007. [Abstract] [Full Text] [PDF]

				M. S. Gregory, R. R. Saff, A. Marshak-Rothstein, and B. R. Ksander Control of Ocular Tumor Growth and Metastatic Spread by Soluble and Membrane Fas Ligand Cancer Res., December 15, 2007; 67(24): 11951 - 11958. [Abstract] [Full Text] [PDF]

				K. Horiuchi, T. Miyamoto, H. Takaishi, A. Hakozaki, N. Kosaki, Y. Miyauchi, M. Furukawa, J. Takito, H. Kaneko, K. Matsuzaki, et al. Cell Surface Colony-Stimulating Factor 1 Can Be Cleaved by TNF-{alpha} Converting Enzyme or Endocytosed in a Clathrin-Dependent Manner J. Immunol., November 15, 2007; 179(10): 6715 - 6724. [Abstract] [Full Text] [PDF]

				M. H.M. Hessel, G. B. Bleeker, J. J. Bax, M. M. Henneman, B. den Adel, M. Klok, M.J. Schalij, D. E. Atsma, and A. van der Laarse Reverse ventricular remodelling after cardiac resynchronization therapy is associated with a reduction in serum tenascin-C and plasma matrix metalloproteinase-9 levels Eur J Heart Fail, October 1, 2007; 9(10): 1058 - 1063. [Abstract] [Full Text] [PDF]

				R. A. Wagenaar-Miller, L. H. Engelholm, J. Gavard, S. S. Yamada, J. S. Gutkind, N. Behrendt, T. H. Bugge, and K. Holmbeck Complementary Roles of Intracellular and Pericellular Collagen Degradation Pathways In Vivo Mol. Cell. Biol., September 15, 2007; 27(18): 6309 - 6322. [Abstract] [Full Text] [PDF]

				W. D. Hardie, T. R. Korfhagen, M. A. Sartor, A. Prestridge, M. Medvedovic, T. D. Le Cras, M. Ikegami, S. C. Wesselkamper, C. Davidson, M. Dietsch, et al. Genomic Profile of Matrix and Vasculature Remodeling in TGF-{alpha} Induced Pulmonary Fibrosis Am. J. Respir. Cell Mol. Biol., September 1, 2007; 37(3): 309 - 321. [Abstract] [Full Text] [PDF]

				C.-H. Kuo, D. Miyazaki, N. Nawata, T. Tominaga, A. Yamasaki, Y. Sasaki, and Y. Inoue Prognosis-Determinant Candidate Genes Identified by Whole Genome Scanning in Eyes with Pterygia Invest. Ophthalmol. Vis. Sci., August 1, 2007; 48(8): 3566 - 3575. [Abstract] [Full Text] [PDF]

				M. Sariahmetoglu, B. D. Crawford, H. Leon, J. Sawicka, L. Li, B. J. Ballermann, C. Holmes, L. G. Berthiaume, A. Holt, G. Sawicki, et al. Regulation of matrix metalloproteinase-2 (MMP-2) activity by phosphorylation FASEB J, August 1, 2007; 21(10): 2486 - 2495. [Abstract] [Full Text] [PDF]

				L. Hammoud, F. Xiang, X. Lu, F. Brunner, K. Leco, and Q. Feng Endothelial nitric oxide synthase promotes neonatal cardiomyocyte proliferation by inhibiting tissue inhibitor of metalloproteinase-3 expression Cardiovasc Res, July 15, 2007; 75(2): 359 - 368. [Abstract] [Full Text] [PDF]

				K. Sanka, R. Maddala, D. L. Epstein, and P. V. Rao Influence of Actin Cytoskeletal Integrity on Matrix Metalloproteinase-2 Activation in Cultured Human Trabecular Meshwork Cells Invest. Ophthalmol. Vis. Sci., May 1, 2007; 48(5): 2105 - 2114. [Abstract] [Full Text] [PDF]

				N. Ferri, G. Colombo, C. Ferrandi, E. W. Raines, B. Levkau, and A. Corsini Simvastatin Reduces MMP1 Expression in Human Smooth Muscle Cells Cultured on Polymerized Collagen by Inhibiting Rac1 Activation Arterioscler. Thromb. Vasc. Biol., May 1, 2007; 27(5): 1043 - 1049. [Abstract] [Full Text] [PDF]

				T. Miki, Y. Takegami, K. Okawa, T. Muraguchi, M. Noda, and C. Takahashi The Reversion-inducing Cysteine-rich Protein with Kazal Motifs (RECK) Interacts with Membrane Type 1 Matrix Metalloproteinase and CD13/Aminopeptidase N and Modulates Their Endocytic Pathways J. Biol. Chem., April 20, 2007; 282(16): 12341 - 12352. [Abstract] [Full Text] [PDF]

				J. S. Ikonomidis, J. A. Jones, J. R. Barbour, R. E. Stroud, L. L. Clark, B. S. Kaplan, A. Zeeshan, J. E. Bavaria, J. H. Gorman III, F. G. Spinale, et al. Expression of matrix metalloproteinases and endogenous inhibitors within ascending aortic aneurysms of patients with bicuspid or tricuspid aortic valves J. Thorac. Cardiovasc. Surg., April 1, 2007; 133(4): 1028 - 1036. [Abstract] [Full Text] [PDF]

				A. De Becker, P. Van Hummelen, M. Bakkus, I. Vande Broek, J. De Wever, M. De Waele, and I. Van Riet Migration of culture-expanded human mesenchymal stem cells through bone marrow endothelium is regulated by matrix metalloproteinase-2 and tissue inhibitor of metalloproteinase-3 Haematologica, April 1, 2007; 92(4): 440 - 449. [Abstract] [Full Text] [PDF]

				H. Piccard, P. E. Van den Steen, and G. Opdenakker Hemopexin domains as multifunctional liganding modules in matrix metalloproteinases and other proteins J. Leukoc. Biol., April 1, 2007; 81(4): 870 - 892. [Abstract] [Full Text] [PDF]

				L. Wang, J. A. Bastarache, N. Wickersham, X. Fang, M. A. Matthay, and L. B. Ware Novel Role of the Human Alveolar Epithelium in Regulating Intra-Alveolar Coagulation Am. J. Respir. Cell Mol. Biol., April 1, 2007; 36(4): 497 - 503. [Abstract] [Full Text] [PDF]

				P. L. Jansen, M. Kever, R. Rosch, E. Krott, M. Jansen, A. Alfonso-Jaume, S. Dooley, U. Klinge, D. H. Lovett, and P. R. Mertens Polymeric meshes induce zonal regulation of matrix metalloproteinase-2 gene expression by macrophages and fibroblasts FASEB J, April 1, 2007; 21(4): 1047 - 1057. [Abstract] [Full Text] [PDF]

				D. M. Jaworski, M. Beem-Miller, G. Lluri, and R. Barrantes-Reynolds Potential regulatory relationship between the nested gene DDC8 and its host gene tissue inhibitor of metalloproteinase-2 Physiol Genomics, January 17, 2007; 28(2): 168 - 178. [Abstract] [Full Text] [PDF]

				Y. Zhang, G. Ge, and D. S. Greenspan Inhibition of Bone Morphogenetic Protein 1 by Native and Altered Forms of {alpha}2-Macroglobulin J. Biol. Chem., December 22, 2006; 281(51): 39096 - 39104. [Abstract] [Full Text] [PDF]

				J. Verstappen and J.W. Von den Hoff Tissue Inhibitors of Metalloproteinases (TIMPs): Their Biological Functions and Involvement in Oral Disease Journal of Dental Research, December 1, 2006; 85(12): 1074 - 1084. [Abstract] [Full Text] [PDF]

				H. Toft-Hansen, R. Buist, X.-J. Sun, A. Schellenberg, J. Peeling, and T. Owens Metalloproteinases Control Brain Inflammation Induced by Pertussis Toxin in Mice Overexpressing the Chemokine CCL2 in the Central Nervous System J. Immunol., November 15, 2006; 177(10): 7242 - 7249. [Abstract] [Full Text] [PDF]

				W. B. Saunders, B. L. Bohnsack, J. B. Faske, N. J. Anthis, K. J. Bayless, K. K. Hirschi, and G. E. Davis Coregulation of vascular tube stabilization by endothelial cell TIMP-2 and pericyte TIMP-3 J. Cell Biol., October 9, 2006; 175(1): 179 - 191. [Abstract] [Full Text] [PDF]

				N. Meraz-Cruz, A. Ortega, G. Estrada-Gutierrez, A. Flores, A. Espejel, C. Hernandez-Guerrero, and F. Vadillo-Ortega Identification of a calcium-dependent matrix metalloproteinase complex in rat chorioallantoid membranes during labour Mol. Hum. Reprod., October 1, 2006; 12(10): 633 - 641. [Abstract] [Full Text] [PDF]

				Y. Ohtake, H. Tojo, and M. Seiki Multifunctional roles of MT1-MMP in myofiber formation and morphostatic maintenance of skeletal muscle J. Cell Sci., September 15, 2006; 119(18): 3822 - 3832. [Abstract] [Full Text] [PDF]

				C. S. Webb, D. D. Bonnema, S. H. Ahmed, A. H. Leonardi, C. D. McClure, L. L. Clark, R. E. Stroud, W. C. Corn, L. Finklea, M. R. Zile, et al. Specific Temporal Profile of Matrix Metalloproteinase Release Occurs in Patients After Myocardial Infarction: Relation to Left Ventricular Remodeling Circulation, September 5, 2006; 114(10): 1020 - 1027. [Abstract] [Full Text] [PDF]

				D.-J. Oh, J. L. Martin, A. J. Williams, P. Russell, D. E. Birk, and D. J. Rhee Effect of latanoprost on the expression of matrix metalloproteinases and their tissue inhibitors in human trabecular meshwork cells. Invest. Ophthalmol. Vis. Sci., September 1, 2006; 47(9): 3887 - 3895. [Abstract] [Full Text] [PDF]

				A. Cozlin, S. Barthelemy, R. Garnotel, F. Antonicelli, H. Kaplan, W. Hornebeck, and S. Lorimier Elastolysis Induces Collagenolysis in a Gingival Lamina Propria Model Journal of Dental Research, August 1, 2006; 85(8): 745 - 750. [Abstract] [Full Text] [PDF]

				J. S. Ikonomidis, J. A. Jones, J. R. Barbour, R. E. Stroud, L. L. Clark, B. S. Kaplan, A. Zeeshan, J. E. Bavaria, J. H. Gorman III, F. G. Spinale, et al. Expression of Matrix Metalloproteinases and Endogenous Inhibitors Within Ascending Aortic Aneurysms of Patients With Marfan Syndrome Circulation, July 4, 2006; 114(1_suppl): I-365 - I-370. [Abstract] [Full Text] [PDF]

				J. J. Bech-Serra, B. Santiago-Josefat, C. Esselens, P. Saftig, J. Baselga, J. Arribas, and F. Canals Proteomic Identification of Desmoglein 2 and Activated Leukocyte Cell Adhesion Molecule as Substrates of ADAM17 and ADAM10 by Difference Gel Electrophoresis. Mol. Cell. Biol., July 1, 2006; 26(13): 5086 - 5095. [Abstract] [Full Text] [PDF]

				Y. Wang and H. S. Sul Ectodomain Shedding of Preadipocyte Factor 1 (Pref-1) by Tumor Necrosis Factor Alpha Converting Enzyme (TACE) and Inhibition of Adipocyte Differentiation. Mol. Cell. Biol., July 1, 2006; 26(14): 5421 - 5435. [Abstract] [Full Text] [PDF]

				A. X. Torres-Collado, W. Kisiel, M. L. Iruela-Arispe, and J. C. Rodriguez-Manzaneque ADAMTS1 Interacts with, Cleaves, and Modifies the Extracellular Location of the Matrix Inhibitor Tissue Factor Pathway Inhibitor-2 J. Biol. Chem., June 30, 2006; 281(26): 17827 - 17837. [Abstract] [Full Text] [PDF]

				D. Vigetti, P. Moretto, M. Viola, A. Genasetti, M. Rizzi, E. Karousou, F. Pallotti, G. De Luca, and A. Passi Matrix metalloproteinase 2 and tissue inhibitors of metalloproteinases regulate human aortic smooth muscle cell migration during in vitro aging FASEB J, June 1, 2006; 20(8): 1118 - 1130. [Abstract] [Full Text] [PDF]

				J. L. Johnson, A. H. Baker, K. Oka, L. Chan, A. C. Newby, C. L. Jackson, and S. J. George Suppression of Atherosclerotic Plaque Progression and Instability by Tissue Inhibitor of Metalloproteinase-2: Involvement of Macrophage Migration and Apoptosis Circulation, May 23, 2006; 113(20): 2435 - 2444. [Abstract] [Full Text] [PDF]

				D.-J. Oh, J. L. Martin, A. J. Williams, R. E. Peck, C. Pokorny, P. Russell, D. E. Birk, and D. J. Rhee Analysis of expression of matrix metalloproteinases and tissue inhibitors of metalloproteinases in human ciliary body after latanoprost. Invest. Ophthalmol. Vis. Sci., March 1, 2006; 47(3): 953 - 963. [Abstract] [Full Text] [PDF]

				H. Nagase, R. Visse, and G. Murphy Structure and function of matrix metalloproteinases and TIMPs Cardiovasc Res, February 15, 2006; 69(3): 562 - 573. [Abstract] [Full Text] [PDF]

				J. P.G. Sluijter, D. P.V. de Kleijn, and G. Pasterkamp Vascular remodeling and protease inhibition-bench to bedside Cardiovasc Res, February 15, 2006; 69(3): 595 - 603. [Abstract] [Full Text] [PDF]

				C. Chaussain-Miller, F. Fioretti, M. Goldberg, and S. Menashi The Role of Matrix Metalloproteinases (MMPs) in Human Caries Journal of Dental Research, January 1, 2006; 85(1): 22 - 32. [Abstract] [Full Text] [PDF]

				G. E. Davis and D. R. Senger Endothelial Extracellular Matrix: Biosynthesis, Remodeling, and Functions During Vascular Morphogenesis and Neovessel Stabilization Circ. Res., November 25, 2005; 97(11): 1093 - 1107. [Abstract] [Full Text] [PDF]

				A. G. Remacle, D. V. Rozanov, P. C. Baciu, A. V. Chekanov, V. S. Golubkov, and A. Y. Strongin The transmembrane domain is essential for the microtubular trafficking of membrane type-1 matrix metalloproteinase (MT1-MMP) J. Cell Sci., November 1, 2005; 118(21): 4975 - 4984. [Abstract] [Full Text] [PDF]

				N. Nour, G. Mayer, J. S. Mort, A. Salvas, M. Mbikay, C. J. Morrison, C. M. Overall, and N. G. Seidah The Cysteine-rich Domain of the Secreted Proprotein Convertases PC5A and PACE4 Functions as a Cell Surface Anchor and Interacts with Tissue Inhibitors of Metalloproteinases Mol. Biol. Cell, November 1, 2005; 16(11): 5215 - 5226. [Abstract] [Full Text] [PDF]

				S. Wei, M. Kashiwagi, S. Kota, Z. Xie, H. Nagase, and K. Brew Reactive Site Mutations in Tissue Inhibitor of Metalloproteinase-3 Disrupt Inhibition of Matrix Metalloproteinases but Not Tumor Necrosis Factor-{alpha}-converting Enzyme J. Biol. Chem., September 23, 2005; 280(38): 32877 - 32882. [Abstract] [Full Text] [PDF]

				S. Y. Kassim, X. Fu, W. C. Liles, S. D. Shapiro, W. C. Parks, and J. W. Heinecke NADPH Oxidase Restrains the Matrix Metalloproteinase Activity of Macrophages J. Biol. Chem., August 26, 2005; 280(34): 30201 - 30205. [Abstract] [Full Text] [PDF]

				A. Diaz-Perales, V. Quesada, J. R. Peinado, A. P. Ugalde, J. Alvarez, M. F. Suarez, F. X. Gomis-Ruth, and C. Lopez-Otin Identification and Characterization of Human Archaemetzincin-1 and -2, Two Novel Members of a Family of Metalloproteases Widely Distributed in Archaea J. Biol. Chem., August 26, 2005; 280(34): 30367 - 30375. [Abstract] [Full Text] [PDF]

				S R Johnson TIMP-1 in asthma: guilty by association Thorax, August 1, 2005; 60(8): 617 - 618. [Full Text] [PDF]

				T. Nonaka, K. Nishibashi, Y. Itoh, I. Yana, and M. Seiki Competitive disruption of the tumor-promoting function of membrane type 1 matrix metalloproteinase/matrix metalloproteinase-14 in vivo Mol. Cancer Ther., August 1, 2005; 4(8): 1157 - 1166. [Abstract] [Full Text] [PDF]

				E. L. Martin, L. A. McCaig, B. Z. Moyer, M. C. Pape, K. J. Leco, J. F. Lewis, and R. A. W. Veldhuizen Differential response of TIMP-3 null mice to the lung insults of sepsis, mechanical ventilation, and hyperoxia Am J Physiol Lung Cell Mol Physiol, August 1, 2005; 289(2): L244 - L251. [Abstract] [Full Text] [PDF]

				A. Garcia-Touchard, T. D. Henry, G. Sangiorgi, L. G. Spagnoli, A. Mauriello, C. Conover, and R. S. Schwartz Extracellular Proteases in Atherosclerosis and Restenosis Arterioscler. Thromb. Vasc. Biol., June 1, 2005; 25(6): 1119 - 1127. [Abstract] [Full Text] [PDF]

				L. Perez-Martinez and D. M. Jaworski Tissue Inhibitor of Metalloproteinase-2 Promotes Neuronal Differentiation by Acting as an Anti-Mitogenic Signal J. Neurosci., May 18, 2005; 25(20): 4917 - 4929. [Abstract] [Full Text] [PDF]

				M.-H. Lee, M. Rapti, and G. Murphy Total Conversion of Tissue Inhibitor of Metalloproteinase (TIMP) for Specific Metalloproteinase Targeting: FINE-TUNING TIMP-4 FOR OPTIMAL INHIBITION OF TUMOR NECROSIS FACTOR-{alpha}-CONVERTING ENZYME J. Biol. Chem., April 22, 2005; 280(16): 15967 - 15975. [Abstract] [Full Text] [PDF]

				S. E. Perez, D. A. Cano, T. Dao-Pick, J.-P. Rougier, Z. Werb, and M. Hebrok Matrix Metalloproteinases 2 and 9 Are Dispensable for Pancreatic Islet Formation and Function In Vivo Diabetes, March 1, 2005; 54(3): 694 - 701. [Abstract] [Full Text] [PDF]

				J. D. Lovelock, A. H. Baker, F. Gao, J.-F. Dong, A. L. Bergeron, W. McPheat, N. Sivasubramanian, and D. L. Mann Heterogeneous effects of tissue inhibitors of matrix metalloproteinases on cardiac fibroblasts Am J Physiol Heart Circ Physiol, February 1, 2005; 288(2): H461 - H468. [Abstract] [Full Text] [PDF]

				M. P. Sanderson, S. N. Erickson, P. J. Gough, K. J. Garton, P. T. Wille, E. W. Raines, A. J. Dunbar, and P. J. Dempsey ADAM10 Mediates Ectodomain Shedding of the Betacellulin Precursor Activated by p-Aminophenylmercuric Acetate and Extracellular Calcium Influx J. Biol. Chem., January 21, 2005; 280(3): 1826 - 1837. [Abstract] [Full Text] [PDF]

				A. K. Behera, E. Hildebrand, J. Scagliotti, A. C. Steere, and L. T. Hu Induction of Host Matrix Metalloproteinases by Borrelia burgdorferi Differs in Human and Murine Lyme Arthritis Infect. Immun., January 1, 2005; 73(1): 126 - 134. [Abstract] [Full Text] [PDF]

				A. C. Newby Dual Role of Matrix Metalloproteinases (Matrixins) in Intimal Thickening and Atherosclerotic Plaque Rupture Physiol Rev, January 1, 2005; 85(1): 1 - 31. [Abstract] [Full Text] [PDF]

				E.-M. Schnaeker, R. Ossig, T. Ludwig, R. Dreier, H. Oberleithner, M. Wilhelmi, and S. W. Schneider Microtubule-Dependent Matrix Metalloproteinase-2/Matrix Metalloproteinase-9 Exocytosis: Prerequisite in Human Melanoma Cell Invasion Cancer Res., December 15, 2004; 64(24): 8924 - 8931. [Abstract] [Full Text] [PDF]

				J. Oh, D.-W. Seo, T. Diaz, B. Wei, Y. Ward, J. M. Ray, Y. Morioka, S. Shi, H. Kitayama, C. Takahashi, et al. Tissue Inhibitors of Metalloproteinase 2 Inhibits Endothelial Cell Migration through Increased Expression of RECK Cancer Res., December 15, 2004; 64(24): 9062 - 9069. [Abstract] [Full Text] [PDF]

				S. Curran, S. R. Dundas, J. Buxton, M. F. Leeman, R. Ramsay, and G. I. Murray Matrix Metalloproteinase/Tissue Inhibitors of Matrix Metalloproteinase Phenotype Identifies Poor Prognosis Colorectal Cancers Clin. Cancer Res., December 15, 2004; 10(24): 8229 - 8234. [Abstract] [Full Text] [PDF]

				H. Toft-Hansen, R. K. Nuttall, D. R. Edwards, and T. Owens Key Metalloproteinases Are Expressed by Specific Cell Types in Experimental Autoimmune Encephalomyelitis J. Immunol., October 15, 2004; 173(8): 5209 - 5218. [Abstract] [Full Text] [PDF]

				C. Van Themsche, T. Alain, A. E. Kossakowska, S. Urbanski, E. F. Potworowski, and Y. St-Pierre Stromelysin-2 (Matrix Metalloproteinase 10) Is Inducible in Lymphoma Cells and Accelerates the Growth of Lymphoid Tumors In Vivo J. Immunol., September 15, 2004; 173(6): 3605 - 3611. [Abstract] [Full Text] [PDF]

				H. G. Munshi, Y. I. Wu, S. Mukhopadhyay, A. J. Ottaviano, A. Sassano, J. E. Koblinski, L. C. Platanias, and M. S. Stack Differential Regulation of Membrane Type 1-Matrix Metalloproteinase Activity by ERK 1/2- and p38 MAPK-modulated Tissue Inhibitor of Metalloproteinases 2 Expression Controls Transforming Growth Factor-{beta}1-induced Pericellular Collagenolysis J. Biol. Chem., September 10, 2004; 279(37): 39042 - 39050. [Abstract] [Full Text] [PDF]

				A. R. Walmsley, G. McCombie, U. Neumann, D. Marcellin, R. Hillenbrand, A. K. Mir, and S. Frentzel Zinc metalloproteinase-mediated cleavage of the human Nogo-66 receptor J. Cell Sci., September 1, 2004; 117(19): 4591 - 4602. [Abstract] [Full Text] [PDF]

				M.-H. Lee and G. Murphy Matrix metalloproteinases at a glance J. Cell Sci., August 15, 2004; 117(18): 4015 - 4016. [Full Text] [PDF]

				O. Salvucci, M. Basik, L. Yao, R. Bianchi, and G. Tosato Evidence for the involvement of SDF-1 and CXCR4 in the disruption of endothelial cell-branching morphogenesis and angiogenesis by TNF-{alpha} and IFN-{gamma} J. Leukoc. Biol., July 1, 2004; 76(1): 217 - 226. [Abstract] [Full Text] [PDF]

				I. K. Y. Lo, L. L. Marchuk, R. Hollinshead, D. A. Hart, and C. B. Frank Matrix Metalloproteinase and Tissue Inhibitor of Matrix Metalloproteinase mRNA Levels Are Specifically Altered in Torn Rotator Cuff Tendons Am. J. Sports Med., July 1, 2004; 32(5): 1223 - 1229. [Abstract] [Full Text] [PDF]

				X. Shi-wen, S. L. Howat, E. A. Renzoni, A. Holmes, J. D. Pearson, M. R. Dashwood, G. Bou-Gharios, C. P. Denton, R. M. du Bois, C. M. Black, et al. Endothelin-1 Induces Expression of Matrix-associated Genes in Lung Fibroblasts through MEK/ERK J. Biol. Chem., May 28, 2004; 279(22): 23098 - 23103. [Abstract] [Full Text] [PDF]

				D Schuppan and T Freitag Fistulising Crohn's disease: MMPs gone awry Gut, May 1, 2004; 53(5): 622 - 624. [Full Text]

				N. E. Sounni, C. Roghi, V. Chabottaux, M. Janssen, C. Munaut, E. Maquoi, B. G. Galvez, C. Gilles, F. Frankenne, G. Murphy, et al. Up-regulation of Vascular Endothelial Growth Factor-A by Active Membrane-type 1 Matrix Metalloproteinase through Activation of Src-Tyrosine Kinases J. Biol. Chem., April 2, 2004; 279(14): 13564 - 13574. [Abstract] [Full Text] [PDF]

				J. Zou, F. Zhu, J. Liu, W. Wang, R. Zhang, C. G. Garlisi, Y.-H. Liu, S. Wang, H. Shah, Y. Wan, et al. Catalytic Activity of Human ADAM33 J. Biol. Chem., March 12, 2004; 279(11): 9818 - 9830. [Abstract] [Full Text] [PDF]

				H. Nakamura, N. Suenaga, K. Taniwaki, H. Matsuki, K. Yonezawa, M. Fujii, Y. Okada, and M. Seiki Constitutive and Induced CD44 Shedding by ADAM-Like Proteases and Membrane-Type 1 Matrix Metalloproteinase Cancer Res., February 1, 2004; 64(3): 876 - 882. [Abstract] [Full Text] [PDF]

				Y. S. Kanwar, J. Wada, S. Lin, F. R. Danesh, S. S. Chugh, Q. Yang, T. Banerjee, and J. W. Lomasney Update of extracellular matrix, its receptors, and cell adhesion molecules in mammalian nephrogenesis Am J Physiol Renal Physiol, February 1, 2004; 286(2): F202 - F215. [Abstract] [Full Text] [PDF]

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