Enterochromaffin cell and 5-hydroxytryptamine responses to the same infectious agent differ in Th1 and Th2 dominant environments

Gut
Yasuaki MotomuraWaliul I Khan

Abstract

5-Hydroxytryptamine (5-HT) released from enterochromaffin cells influences intestinal homeostasis by altering gut physiology and is implicated in the pathophysiology of various gut disorders. The mechanisms regulating 5-HT production in the gut remain unclear. This study investigated the T helper (Th) 1/Th2-based immunoregulation of enterochromaffin cell function and 5-HT production in a model of enteric infection. Trichuris muris-infected AKR (susceptible to infection and generates Th1 response), BALB/c (resistant to infection and generates Th2 response), Stat4-deficient (impaired in Th1 response) and Stat6-deficient (impaired in Th2 response) mice were investigated to assess enterochromaffin cells, 5-HT and cytokines. In association with the generation of a Th2 response we observed higher enterochromaffin cell numbers and 5-HT content in the colon of BALB/c mice compared with AKR mice. Numbers of enterochromaffin cells and amount of 5-HT were significantly lower in Stat6-deficient mice after infection compared with Stat4-deficient mice. In addition, enterochromaffin cell numbers and 5-HT content were significantly higher after reconstitution of severe combined immunodeficient mice with in-vitro polarised Th2 cells. The study ...Continue Reading

Citations

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