Résumé
Les interfaces épithéliales muqueuses, indispensables aux relations de l'organisme avec son environnement digestif, respiratoire, reproductif, sont défendues par un système immunitaire apparaissant de plus en plus élaboré et contrôlé. Il comporte une participation efficace des cellules et des molécules de l'immunité innée, ensemble physiologique de connaissance récente, mais phylogénétiquement très ancien. Les muqueuses sont d'autre part colonisées par des cellules immunitaires (cellules présentatrices d'antigène, lignées lymphocytaires T, B), mobiles entre un site inducteur principal, les plaques de Peyer, et des sites effecteurs diversifiés et produisant des molécules effectrices et régulatrices originales (IgA sécrétoires, cytokines, chemokines). Cet ensemble complexe est physiologiquement particulièrement contrôlé et reste habituellement silencieux. Il peut néanmoins être le siège de pathologies spécifiques et commence à pouvoir être exploré biologiquement. Le progrès des connaissances fait espérer des modalités thérapeutiques nouvelles à impact muqueux.
Mots-clé: Immunité muqueuse - immunité innée - IgA sécrétoires - TH3 - physiopathologie
Abstract
Mucosal epithelial interfaces, essential for a proper interaction of the individual with the environment of the digestive, respiratory or reproductive tracts, are protected by a powerful immune system that appears more and more sophisticated and controlled. This system involves the newly described cells and molecules of innate immunity, which appear phylogenetically highly conserved. Mucosae are moreover seeded by immunocompetent cells (antigen presenting cells, B and T lymphocytes), that traffic between the major inductive sites of Peyer's patches, and diversified effector sites. These cells elaborate original effector and regulatory molecules (secretory IgA, cytokines, chemokines).
This complex and tightly controlled system is usually quite silent. Specific pathologies may however develop, the exploration of which being progressively more possible. Increasing knowledge about the mucosae associated immune system suggests that new treatments with mucosal impact should develop in the future.
Keywords: Mucosal immunity - innate immunity - secretory IgA - TH3 - pathophysiology
Contributor Information
Marie-Christine Béné, Email: bene@grip.u-nancy.fr.
Gilbert C. Faure, Email: bene@grip.u-nancy.fr.
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