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- W2914640360 abstract "Le rotavirus est l’agent pathogène le plus fréquent des diarrhées de l’enfant de moins de cinq ans dans le monde. L’infection des entérocytes matures des villosités de l’intestin grêle entraîne les anomalies structurales et fonctionnelles complexes de l’épithélium à l’origine de la diarrhée. L’infection diminue les fonctions de digestion (diminution de l’activité des disaccharidases) et d’absorption des nutriments (diminution de l’absorption du glucose via SGLT1 et de l’absorption de la leucine) à l’origine de la diarrhée osmotique. La diarrhée à rotavirus comporte également une hypersécrétion modérée du chlore dans la lumière intestinale. La glycoprotéine non structurale NSP4 du rotavirus est la première entérotoxine virale connue, elle a la capacité d’induire la diarrhée sécrétoire chez le souriceau en l’absence de lésions histologiques. Contrairement à ce qui est observé dans les diarrhées dues à des entérotoxines bactériennes (toxine du cholera ou d’ Escherichia coli ), la diarrhée à rotavirus s’accompagne d’une augmentation de l’absorption villositaire du chlore alors que la sécrétion de chlore par les cellules cryptiques reste inchangée. Les mécanismes d’action de NSP4 apparaissent très différents de ceux impliqués par les entérotoxines bactériennes. NSP4 pourrait agir en augmentant le calcium intracellulaire par l’intermédiaire du système nerveux entérique (SNE). The rotavirus is the major cause of infantile gastroenteritis. The virus infects the mature enterocytes of the villus tip of the small intestine and induces a watery diarrhea. Diarrhea can occur in the absence of histological changes in the intestine, and, conversely, the histological changes can be asymptomatic. Rotavirus decreases the activities of digestive enzymes at the apical brush border membrane and inhibits Na + -solute cotransport systems. Accumulation of carbohydrates in the intestinal lumen as well as malabsorption of nutrients and a concomitant inhibition of water absorption can lead to a malabsorptive component of diarrhea. Since the discovery of the NSP4 enterotoxin, several hypotheses have been proposed in favour of an additional secretion component in the pathogenesis of diarrhea. Rotavirus induces a moderate net chloride secretion at the onset of the diarrhea. The mechanisms appear to be different from those used by bacterial enterotoxin that cause pure secretory diarrhea. Rotavirus stimulated Cl − reabsorption in villi and failed to stimulate Cl − secretion in crypt. Intestinal villi could secrete chloride as a result of rotavirus infection. The chloride secretory response is regulated by a dependant calcium-signalling pathway induced by NSP4. The overall response is weak, suggesting that NSP4 may exert both secretory and subsequent antisecretory actions, hence limiting Cl − secretion." @default.
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- W2914640360 date "2007-12-01" @default.
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- W2914640360 title "Physiopathologie de la diarrhée à rotavirus" @default.
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- W2914640360 doi "https://doi.org/10.1016/j.jpp.2007.11.010" @default.
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