Tumour invasion and matrix metalloproteinases

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Abstract

Matrix metalloproteinases (MMPs) are proteolytic enzymes which play a major role in tumour invasion. They are mainly produced by host stromal cells in most carcinomas and their expression implies a close co-operation between tumour and stromal cells. Increasing data also demonstrate that, in association with a process of epithelial-to-mesenchymal transition, many MMPs can be expressed by tumour cell themselves.

Their most well-known role is the degradation of extra-cellular matrix macromolecules which in turn may regulate tumour invasion in some conditions. This ECM degradation generates some matrikins which are also implicated in tumour invasion and angiogenesis. Moreover, MMPs are also implicated in the degradation of cell adhesion molecules and release and activation of growth factors.

Introduction

Tumour invasion is greatly dependent on the permissive action of the microenvironment. One critical factor is the production of proteolytic enzymes involved in the degradation and remodelling of the extra-cellular matrix (ECM). Among these enzymes, matrix metalloproteinases (MMPs) represent a large family playing key roles in cell proliferation, angiogenesis, tumour invasion and metastasis. These enzymes principally degrade the ECM components, but have also other substrates such as cytokines, growth factor receptors, cell–cell and cell–matrix adhesion molecules which may also participate to the invasion process [1]. Moreover, the degradation of ECM macromolecules and cell adhesion molecules can release cryptic sites that in turn may function to modulate the cell behaviour.

Section snippets

The family of MMPs

MMPs are zinc-dependent endopeptidases, which are composed of at least a pro-domain, a catalytic domain and a highly conserved active site domain which contains the HEXGHXXGXXH motif (Table 1). This motif contains three histidine residues involved in the binding of zinc ligands necessary for MMP activity. MMPs also contain a PRCGVDP motif in the pro-domain that is responsible for maintaining latency in the zymogens. The production of active enzymes requires the proteolytic removal of the

The source of MMPs in tumours

Numerous tumour cell lines produce proteolytic enzymes involved in cell invasion in several in vitro migration/invasion assays by degrading various substrates such as type I collagen or Matrigel but are also implicated in vivo in tumour take and tumour invasion after subcutaneous injection in nude mice. These observations led to the hypothesis that tumour cells were largely implicated in the invasion process via secreted proteolytic enzymes. Indeed, the first observation using

The co-operation between tumour and stromal cells

Among the factors involved in the co-operation between tumour and host cells, extracellular matrix metalloproteinase inducer (EMMPRIN) is produced by tumour cells and is able to stimulate the expression of MMP-1, MMP-2 and MMP-3 by fibroblasts [25]. This factor is a transmembrane glycoprotein of 58 kDa identified as a member of the immunoglobulin superfamily. Immunohistochemical studies have demonstrated that EMMPRIN is localised in numerous tumours including bladder, skin, lung and breast

Role of the ECM degradation fragments in the regulation of MMPs and tumour invasion

An emerging concept in the field of tumour invasion is that proteolytic activity on ECM substrates uncovers or releases cryptic sites of ECM macromolecules that function to modulate a cellular response. Such sites have been referred as matricryptic sites or matrikins.

Among these ECM macromolecules, laminin 5 represents a factor able to stimulate tumour invasion. Thus, it has been shown that MMP-2 and MMP-14 selectively cleaves the γ2 chain of laminin 5, which in turn has chemotactic properties

MMPs and tumour cell phenotype

Although the principal source of MMPs is the stromal cells, in some circumstances, MMPs may be produced in vivo by tumour cells. MMP production by tumour cells themselves is often associated with the expression of other mesenchymal markers and the loss of many epithelial characteristics, a phenomenon referred as to an epithelial-to-mesenchymal transition (EMT) [69], [70], [71]. Indeed, these cells express intermediate filaments of vimentin and present a loss or a redistribution of cell adhesion

Conclusions

Tumour invasion is a complex process involving an interplay between different cell types present in the tumour environment. The enhanced production of MMP in the tumour environment either by stromal cells involved in the stroma reaction or by tumour cells undergoing an EMT appear as key events of tumour invasion. The detection of large amounts of MMPs in many cancers and their association with poor prognosis have emphasised their role as potential therapeutic targets. New therapeutic approaches

Myriam Polette is Assistant Professor of Cell Biology and she works in the INSERM Unit 514 in Reims, France.

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    Myriam Polette is Assistant Professor of Cell Biology and she works in the INSERM Unit 514 in Reims, France.

    Béatrice Nawrocki-Raby is searcher in INSERM Unit 514 in Reims, France.

    Christine Clavel is Professor of Cell Biology and she works in INSERM Unit 514 in Reims, France.

    Christine Gilles is a research associate from the “Fond National de la Recherche Scientifique” (F.N.R.S., Belgium).

    Philippe Birembaut is Professor of Histology and he works in INSERM Unit 514 in Reims, France.

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