MMP2

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Matrix metallopeptidase 2 (gelatinase A, 72kDa gelatinase, 72kDa type IV collagenase)
Protein MMP2 PDB 1ck7.png
PDB rendering based on 1ck7.
Available structures
PDB Ortholog search: PDBe, RCSB
Identifiers
Symbols MMP2 ; CLG4; CLG4A; MMP-II; MONA; TBE-1
External IDs OMIM120360 MGI97009 HomoloGene3329 IUPHAR: 1629 ChEMBL: 333 GeneCards: MMP2 Gene
EC number 3.4.24.24
RNA expression pattern
PBB GE MMP2 201069 at tn.png
More reference expression data
Orthologs
Species Human Mouse
Entrez 4313 17390
Ensembl ENSG00000087245 ENSMUSG00000031740
UniProt P08253 P33434
RefSeq (mRNA) NM_001127891 NM_008610
RefSeq (protein) NP_001121363 NP_032636
Location (UCSC) Chr 16:
55.42 – 55.54 Mb
Chr 8:
92.83 – 92.85 Mb
PubMed search [1] [2]

72 kDa type IV collagenase also known as matrix metalloproteinase-2 (MMP-2) and gelatinase A is an enzyme that in humans is encoded by the MMP2 gene.[1]

Function[edit]

Proteins of the matrix metalloproteinase (MMP) family are involved in the breakdown of extracellular matrix (ECM) in normal physiological processes, such as embryonic development, reproduction, and tissue remodeling, as well as in disease processes, such as arthritis and metastasis. Most MMP's are secreted as inactive proproteins which are activated when cleaved by extracellular proteinases. This gene encodes an enzyme which degrades type IV collagen, the major structural component of basement membranes. The enzyme plays a role in endometrial menstrual breakdown, regulation of vascularization and the inflammatory response.[2]

Activation[edit]

Activation of MMP-2 requires proteolytic processing. A complex of membrane type 1 MMP (MT1-MMP/MMP14) and tissue inhibitor of metalloproteinase 2 recruits pro-MMP 2 from the extracellular milieu to the cell surface. Activation then requires an active molecule of MT1-MMP and auto catalytic cleavage. Clustering of integrin chains promotes activation of MMP-2. Another factor that will support the activation of MMP-2 is cell-cell clustering. A wild-type activated leukocyte cell adhesion molecule (ALCAM) is also required to activate MMP-2.

Clinical significance[edit]

Mutations in the MMP2 gene are associated with Torg-Winchester syndrome, multicentric osteolysis, arthritis syndrome,[3] and possibly keloids.

Role of MMP-2 in cancer progression[edit]

Altered expression and activity levels of MMPs have been strongly implicated in the progression and metastasis of many forms of cancer. Increased MMP-2 activity has also been linked with a poor prognosis in multiple forms of cancer including colorectal, melanoma, breast, lung, ovarian, and prostate.[4] Furthermore, changes in MMP-2 activity can come from alterations in levels of transcription, MMP secretion, MMP activation, or MMP inhibition. MMP production in many cancers may be upregulated in surrounding stromal tissue rather than simply in the tumor lesion. For instance, Mook, et al. showed that MMP-2 mRNA levels are strikingly similar between metastatic and non-metastatic lesions in colorectal cancer, but metastatic cases are correlated with higher levels of MMP-2 mRNA in surrounding healthy tissue.[5] For this reason, it is difficult to fully understand the complex role of MMPs in cancer progression.

Role in cancer cell invasion[edit]

One of the major implications of MMPs in cancer progression is their role in ECM degradation, which allows cancer cells to migrate out of the primary tumor to form metastases. More specifically, MMP-2 (along with MMP-9) is capable of degrading type IV collagen, the most abundant component of the basement membrane. The basement membrane is important for maintaining tissue organization, providing structural support for cells, and influencing cell signaling and polarity. Degradation of the basement membrane is an essential step for the metastatic progression of most cancers.[5]

Cancer cell invasion, ECM degradation, and metastasis are highly linked with the presence of invadopodia, protrusive and adhesive structures on cancer cells. Invadopodia have been shown to concentrate MMPs (including MT1-MMP, MMP-2, and MMP-9) for localized release and activation.[6] Furthermore, degradation products of MMP activity may further promote invadopodia formation and MMP activity.[7] Finally, MMP-2 and several other MMPs have been shown to proteolytically activate TGF-β, which has been shown to promote epithelial mesenchymal transition (EMT), a key process involved in cancer metastasis.[8]

Role in cell signaling[edit]

MMP degradation of the ECM affects cellular behavior through changes in integrin-cell binding, by releasing growth factors harbored by the ECM, by generating ECM degradation products, and by revealing cryptic binding sites in ECM molecules.[9] For instance, MMP-2 degradation of collagen type I can reveal a previously inaccessible cryptic binding site that binds with the αvβ3 integrin expressed by human melanoma cells. Signaling through this integrin is necessary for melanoma cell viability and growth in a collagen matrix and can potentially rescue the cells from apoptosis.[10] As another example, cleavage of laminin-5, a component of the basement membrane, by MMP-2 has been shown to reveal a cryptic site inducing migration of breast epithelial cells.[11]

More generally, by degrading the ECM, MMPs release growth factors that were previously bound to the ECM, allowing them to bind with cell receptors and influence cell signaling. Furthermore, many MMPs also activate other proMMPs along with growth factors.[9] MMP-2 has also been shown to cleave other non-ECM substrates including growth factors such as TGF-β, FGF receptor-1, proTNF, IL-1β and various chemokines.[12] For instance, MMP-2 has been implicated, along with MMP-9 in cleaving latent TGF-β, which has complex interactions with cancer cells. TGF-β generally plays a role in maintaining tissue homeostasis and preventing tumor progression. However, genetically unstable cancer cells can often evade regulation by TGF-β by altering TGF-β receptors in downstream signaling processes. Furthermore, expression of TGF-β is also correlated with immune tolerance and may help shield cancer cells from immune regulation.[13]

Role in neovascularization and lymphangiogenesis[edit]

MMP-2 also plays an important role in the formation of new blood vessels within tumors, a process known as angiogenesis. This process is essential for tumor progression, because as tumors grow they need increasing supplies of oxygen and nutrients. Localized MMP-2 activity plays an important role in endothelial cell migration, a key feature of angiogenesis. Additionally, MMP-9 and other MMPs have been suggested to also play a complex, indirect role in angiogenesis by promoting VEGF mobilization and generating antiangiogenic factors.[5]

For instance, when studying carcinogenesis of pancreatic islets in transgenic mice, Bergers et al. showed that MMP-2 and MMP-9 were upregulated in angiogenic lesions and that the upregulation of these MMPs triggered the release of bioactive VEGF, a potent stimulator of angiogenesis. Additionally, the group determined that MMP-2 knockout mice showed decreased rates of tumor growth relative to tumor growth rates in wild type mice.[14] Furthermore, increased expression and activity of MMP-2 has been tied to increased vascularization of lung carcinoma metastases in the central nervous system, which likely increases survival rate of these metastases.[15]

Finally, MMP-2 has been also shown to drive lymphangiogenesis, which is often excessive in tumor environments and can provide a route of metastasis for cancer cells. Detry, et al. showed that knocking down mmp2 in zebrafish prevented the formation of lymphatic vessels without altering angiogenesis, while MMP-2 inhibition slowed the migration of lymphatic endothelial cells and altered the morphology of new vessels.[5] These results suggest that MMP-2 may alter tumor viability and invasion by regulating lymphangiogenesis in addition to angiogenesis.

Inhibition of MMP-2 as cancer therapy[edit]

Clinical trials for cancer therapies using MMP inhibitors have yielded generally unsuccessful results. These poor results are likely due to the fact that MMPs play complex roles in tissue formation and cancer progression, and indeed many MMPs have both pro and anti-tumorogenic properties. Furthermore most clinical studies involve advanced stages of cancer, where MMP inhibitors are not particularly effective. Finally, there are no reliable biomarkers available for assessing the efficacy of MMP inhibitors and MMPs are not directly cytotoxic (so they do not cause tumor shrinkage), so it is difficult for researchers to determine whether the inhibitors have successfully reached their targets.[4]

However, initial clinical trials using broad spectrum MMP inhibitors did show some positive results. Phase I clinical trials showed that MMP inhibitors are generally safe with minimal adverse side effects. Additionally, trials with marimastat did show a slight increase in survival of patients with gastric or pancreatic cancer.[4]

Various research groups have already suggested many strategies for improving the effectiveness of MMP inhibitors in cancer treatment. First, highly specific MMP inhibitors could be used to target the functions of specific MMPs, which should allow doctors to increase the treatment dosage while minimizing adverse side effects. MMP inhibitors could also be administered along with cytotoxic agents or other proteinase inhibitors. Finally, MMP inhibitors could be used during earlier stages of cancer to prevent invasion and metastasis.[4]

Additionally, tumor overexpression of MMPs can be used to potentially target the release of chemotherapeutic agents specifically to tumor sites. For instance, cytotoxic agents or siRNA could be encapsulated in liposomes or viral vectors that only become activated upon proteolytic cleavage by a target MMP. Finally, the tumor-targeting properties of MMP inhibitors offer a potential strategy for identifying small tumors. Researchers could couple MMP inhibitors to imaging agents to help detect tumors before they spread. Though initial trials yielded disappointing results, MMP inhibitors offer significant potential for improving cancer treatment by slowing the process of cancer cell invasion and metastasis.[4]

Interactions[edit]

MMP2 has been shown to interact with:

References[edit]

  1. ^ Devarajan P, Johnston JJ, Ginsberg SS, Van Wart HE, Berliner N (December 1992). "Structure and expression of neutrophil gelatinase cDNA. Identity with type IV collagenase from HT1080 cells". J. Biol. Chem. 267 (35): 25228–32. PMID 1460022. 
  2. ^ "Entrez Gene: MMP2 matrix metallopeptidase 2 (gelatinase A, 72kDa gelatinase, 72kDa type IV collagenase)". 
  3. ^ Martignetti JA, Aqeel AA, Sewairi WA, Boumah CE, Kambouris M, Mayouf SA et al. (July 2001). "Mutation of the matrix metalloproteinase 2 gene (MMP2) causes a multicentric osteolysis and arthritis syndrome". Nat. Genet. 28 (3): 261–5. doi:10.1038/90100. PMID 11431697. 
  4. ^ a b c d e Björklund M, Koivunen E (May 2005). "Gelatinase-mediated migration and invasion of cancer cells". Biochimica et Biophysica Acta 1755 (1): 37–69. doi:10.1016/j.bbcan.2005.03.001. PMID 15907591. 
  5. ^ a b c d Mook OR, Frederiks WM, Van Noorden CJ (Dec 2004). "The role of gelatinases in colorectal cancer progression and metastasis". Biochimica et Biophysica Acta 1705 (2): 69–89. doi:10.1016/j.bbcan.2004.09.006. PMID 15588763. 
  6. ^ Jacob A, Prekeris R. "The regulation of MMP targeting to invadopodia during cancer metastasis". Frontiers in Cell and Developmental Biology 3: 4. doi:10.3389/fcell.2015.00004. PMID 25699257. 
  7. ^ Clark ES, Whigham AS, Yarbrough WG, Weaver AM (May 2007). "Cortactin is an essential regulator of matrix metalloproteinase secretion and extracellular matrix degradation in invadopodia". Cancer Research 67 (9): 4227–35. doi:10.1158/0008-5472.CAN-06-3928. PMID 17483334. 
  8. ^ Gialeli C, Theocharis AD, Karamanos NK (Jan 2011). "Roles of matrix metalloproteinases in cancer progression and their pharmacological targeting". The FEBS Journal 278 (1): 16–27. doi:10.1111/j.1742-4658.2010.07919.x. PMID 21087457. 
  9. ^ a b McCawley LJ, Matrisian LM (Apr 2000). "Matrix metalloproteinases: multifunctional contributors to tumor progression". Molecular Medicine Today 6 (4): 149–56. PMID 10740253. 
  10. ^ Montgomery AM, Reisfeld RA, Cheresh DA (Sep 1994). "Integrin alpha v beta 3 rescues melanoma cells from apoptosis in three-dimensional dermal collagen". Proceedings of the National Academy of Sciences of the United States of America 91 (19): 8856–60. PMID 7522323. 
  11. ^ Giannelli G, Falk-Marzillier J, Schiraldi O, Stetler-Stevenson WG, Quaranta V (Jul 1997). "Induction of cell migration by matrix metalloprotease-2 cleavage of laminin-5". Science 277 (5323): 225–28. PMID 9211848. 
  12. ^ Detry B, Erpicum C, Paupert J, Blacher S, Maillard C, Bruyère F et al. (May 2012). "Matrix metalloproteinase-2 governs lymphatic vessel formation as an interstitial collagenase". Blood 119 (21): 5048–56. doi:10.1182/blood-2011-12-400267. PMID 22490679. 
  13. ^ Massagué J (Jul 2008). "TGFbeta in Cancer". Cell 134 (2): 215–30. doi:10.1016/j.cell.2008.07.001. PMID 18662538. 
  14. ^ Bergers G, Brekken R, McMahon G, Vu TH, Itoh T, Tamaki K et al. (Oct 2000). "Matrix metalloproteinase-9 triggers the angiogenic switch during carcinogenesis". Nature Cell Biology 2 (10): 737–44. doi:10.1038/35036374. PMID 11025665. 
  15. ^ Rojiani MV, Alidina J, Esposito N, Rojiani AM. "Expression of MMP-2 correlates with increased angiogenesis in CNS metastasis of lung carcinoma". International Journal of Clinical and Experimental Pathology 3 (8): 775–81. PMID 21151391. 
  16. ^ McQuibban GA, Gong JH, Tam EM, McCulloch CA, Clark-Lewis I, Overall CM (August 2000). "Inflammation dampened by gelatinase A cleavage of monocyte chemoattractant protein-3". Science 289 (5482): 1202–6. doi:10.1126/science.289.5482.1202. PMID 10947989. 
  17. ^ a b Bein K, Simons M (October 2000). "Thrombospondin type 1 repeats interact with matrix metalloproteinase 2. Regulation of metalloproteinase activity". J. Biol. Chem. 275 (41): 32167–73. doi:10.1074/jbc.M003834200. PMID 10900205. 
  18. ^ Morgunova E, Tuuttila A, Bergmann U, Tryggvason K (May 2002). "Structural insight into the complex formation of latent matrix metalloproteinase 2 with tissue inhibitor of metalloproteinase 2". Proc. Natl. Acad. Sci. U.S.A. 99 (11): 7414–9. doi:10.1073/pnas.102185399. PMC 124245. PMID 12032297. 
  19. ^ Overall CM, Tam E, McQuibban GA, Morrison C, Wallon UM, Bigg HF et al. (December 2000). "Domain interactions in the gelatinase A.TIMP-2.MT1-MMP activation complex. The ectodomain of the 44-kDa form of membrane type-1 matrix metalloproteinase does not modulate gelatinase A activation". J. Biol. Chem. 275 (50): 39497–506. doi:10.1074/jbc.M005932200. PMID 10991943. 
  20. ^ a b Bigg HF, Shi YE, Liu YE, Steffensen B, Overall CM (June 1997). "Specific, high affinity binding of tissue inhibitor of metalloproteinases-4 (TIMP-4) to the COOH-terminal hemopexin-like domain of human gelatinase A. TIMP-4 binds progelatinase A and the COOH-terminal domain in a similar manner to TIMP-2". J. Biol. Chem. 272 (24): 15496–500. doi:10.1074/jbc.272.24.15496. PMID 9182583. 
  21. ^ a b Kai HS, Butler GS, Morrison CJ, King AE, Pelman GR, Overall CM (December 2002). "Utilization of a novel recombinant myoglobin fusion protein expression system to characterize the tissue inhibitor of metalloproteinase (TIMP)-4 and TIMP-2 C-terminal domain and tails by mutagenesis. The importance of acidic residues in binding the MMP-2 hemopexin C-domain". J. Biol. Chem. 277 (50): 48696–707. doi:10.1074/jbc.M209177200. PMID 12374789. 

Further reading[edit]

  • Massova I, Kotra LP, Fridman R, Mobashery S (1998). "Matrix metalloproteinases: structures, evolution, and diversification". FASEB J. 12 (12): 1075–95. doi:10.1142/S0217984998001256. PMID 9737711. 
  • Nagase H, Woessner JF (1999). "Matrix metalloproteinases". J. Biol. Chem. 274 (31): 21491–4. doi:10.1074/jbc.274.31.21491. PMID 10419448. 
  • Goffin F, Frankenne F, Béliard A, Perrier D'Hauterive S, Pignon MR, Geenen V et al. (2002). "Human endometrial epithelial cells modulate the activation of gelatinase a by stromal cells". Gynecol. Obstet. Invest. 53 (2): 105–11. doi:10.1159/000053003. PMID 11961384. 
  • Hrabec E, Naduk J, Strek M, Hrabec Z (2007). "[Type IV collagenases (MMP-2 and MMP-9) and their substrates--intracellular proteins, hormones, cytokines, chemokines and their receptors]". Postepy Biochem. 53 (1): 37–45. PMID 17718386. 

External links[edit]

  • The MEROPS online database for peptidases and their inhibitors: M10.003