Résumé
Les maladies diarrhéiques, responsables d’une forte morbidité et mortalité à travers le monde sont le plus souvent induites par l’infection microbienne. Les microorganismes (bactéries, virus, parasites) en interagissant avec les cellules épithéliales de l’hôte, induisent une cascade inflammatoire.
L’approche physiologique de l’étiologie des diarrhées aiguës démontre l’importance des mécanismes de l’inflammation dans les désordres de la muqueuse intestinale. Les interactions des pathogènes avec les cellules épithéliales induisent l’activation de facteurs transcriptionnels tels que NF kappa B, les MAP kinases, liés à la production de cytokines.
Parallèlement, l’infection microbienne provoque la libération de radicaux libres oxygénés. Parmi ces radicaux, de fortes productions de monoxyde d’azote (NO) peuvent générer en présence d’anion superoxyde le radical peroxynitrite, connu pour ses effets délétères sur les tissus.
Finalement, plus tardivement, l’apoptose induite par les cytokines pro-inflammatoires peut servir à éliminer les cellules immunitaires ou à évacuer les défenses de l’hôte pour limiter l’infection.
Comme la barrière intestinale n’est pas une barrière inerte, les mécanismes de défense de la muqueuse réagissent contre l’agression de type inflammatoire. Après l’infection microbienne, la mucine extracellulaire est augmentée pour réduire l’adhérence des microorganismes. Mais l’effet le plus important est observé au niveau des jonctions étroites qui contrôlent et maintiennent la résistance transépithéliale et les flux de molécules par voie paracellulaire.
En conclusion, le processus inflammatoire initialisé par l’infection microbienne entraîne des diarrhées aiguës. Comme dans certains cas, la diarrhée est persistante avec une inflammation chronique, il y a un risque de développer le syndrome de l’intestin irritable. Pour protéger la muqueuse intestinale contre les conséquences sévères de l’inflammation, il est nécessaire de prévenir l’interaction des pathogènes avec les cellules épithéliales en augmentant les défenses de la barrière muqueuse.
Summary
Diarrheal diseases, actually recognized for high morbidity and mortality in the world, most commonly are induced by microbial infection. The microorganisms (bacteria, viruses, parasites), by an interaction with the intestinal epithelial cells of the host, induce an inflammatory cascade. Physiological approach of the etiology of the acute diarrhea, demonstrates the importance of the mechanisms of inflammation in the disorders of the intestinal mucosa. Pathogen interactions with the epithelial cells induce activation of transcriptional factors such as NF kappa B, Map kinases linked to the production of cytokines. Parallely, microbial infection provokes the release of oxygenated free radicals. Among these radicals, high production of nitric oxide (NO) can generate, in the presence of Superoxide anion, the peroxinitrite radical known for its deleterious effects on the host tissues. Finally, in a relatively late event, apoptosis induced by the proinflammatory cytokines may serve to eliminate immune cells or evacuate host defences for limiting infection.
As the intestinal barrier is not a static barrier, mucosal defence mechanisms react against inflammatory pathogen aggression. After microbial infection, extracellular mucin is increased to reduce the microorganism adherence. But, the major effect is observed on the tight junction barrier that controls and maintains the transepithelial resistance and the paracellular flux of macromolecules.
In conclusion, inflammatory process initialised by microbial infection causes acute diarrhea. As in certains cases the diarrhea is persistent with chronic inflammation, there is a risk to develop irritable bowel syndrome. To protect the intestinal mucosa against severe inflammation consequences, it is necessary to prevent pathogen interaction with the epithelial cells by increasing the mucosa barrier defences.
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Droy-Lefaix, MT., Bueno, L. Diarrhée et cascade inflammatoire: une nouvelle approche. Acta Endosc 33, 773–780 (2003). https://doi.org/10.1007/BF03002623
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DOI: https://doi.org/10.1007/BF03002623