Résumés
Résumé
L’épithélium de surface des voies aériennes proximales assure la protection de la muqueuse respiratoire grâce à différents mécanismes, comme la clairance mucociliaire, la régulation des flux d’ions et d’eau et la sécrétion de molécules de défense. La seconde ligne de protection est assurée par des complexes jonctionnels intercellulaires permettant de préserver la fonction de barrière de l’épithélium. En contact permanent avec l’environnement extérieur, l’épithélium des voies aériennes est cependant fréquemment lésé par les agents toxiques, les bactéries ou les virus inhalés : ces lésions peuvent entraîner la perte de l’intégrité de la barrière épithéliale ou la desquamation partielle ou totale des cellules épithéliales. Afin de restaurer sa fonction, l’épithélium respiratoire doit non seulement réparer les lésions, mais aussi reconstituer et régénérer un épithélium fonctionnel. Ces processus complexes allient des fonctions de migration, prolifération et différenciation cellulaire, régulées par divers facteurs de croissance, cytokines, protéines de la matrice extracellulaire et enzymes protéolytiques. La connaissance des mécanismes cellulaires et moléculaires gouvernant la restauration tissulaire est un prérequis indispensable à l’élaboration de stratégies prorégénératrices de l’épithélium de surface des voies aériennes dans de nombreuses pathologies respiratoires telles que l’asthme, les bronchopneumopathies chroniques obstructives, la mucoviscidose ou les bronchiolites oblitérantes.
Summary
Despite an efficient defence system, the airway surface epithelium, in permanent contact with the external milieu, is frequently injured by inhaled pollutants, microorganisms and viruses. The response of the airway surface epithelium to an acute injury includes a succession of cellular events varying from the loss of the surface epithelium integrity to partial shedding of the epithelium or even to complete denudation of the basement membrane. The epithelium has then to repair and regenerate to restore its functions, through several mechanisms including basal cell spreading and migration, followed by proliferation and differentiation of epithelial cells. The cellular and molecular factors involved in wound repair and epithelial regeneration are closely interacting and imply extracellular matrix proteins, matrix metalloproteinases (MMPs) and their inhibitors as well as cytokines and growth factors secreted by airway epithelial and mesenchymal cells. The development of in vitro and in vivo models of airway epithelium wound repair allowed the study of the spatio-temporal modulation of these factors during the different steps of epithelial repair and regeneration. In this context, several studies have demonstrated that the matrix and secretory environment are markedly involved in these mechanisms and that their dysregulation may induce remodelling of the airway mucosa. A better knowledge of the mechanisms involved in airway epithelium regeneration may pave the way to regenerative therapeutics allowing the reconstitution of a functional airway epithelium in numerous respiratory diseases such as asthma, chronic obstructive pulmonary diseases, cystic fibrosis and bronchiolitis.
Parties annexes
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