Lymphotoxin beta receptor signaling induces the chemokine CCL20 in intestinal epithelium

Gastroenterology
Martin RumboDaniela Finke

Abstract

The follicle-associated epithelium (FAE) that overlies Peyer's patches (PPs) exhibits distinct features compared with the adjacent villus epithelium. Besides the presence of antigen-sampling membranous M cells and the down-regulation of digestive functions, it constitutively expresses the chemokine CCL20. The mechanisms that induce FAE differentiation and CCL20 expression are poorly understood. The aim of this work was to test whether lymphotoxin beta receptor signaling (LTbetaR), which plays a central role in PPs' organogenesis, mediates CCL20 gene expression in intestinal epithelial cells. CCL20, lymphotoxin beta (LTbeta) and LTbetaR expression were monitored during embryonic development by in situ hybridization of mouse intestine. The human intestinal epithelial cell line T84 was used to study CCL20 expression following LTalpha(1)/beta(2) stimulation. In vivo CCL20 expression following agonistic anti-LTbetaR antibody treatment was studied by laser microdissection and quantitative RT-PCR. CCL20 was expressed in the FAE before birth at the time when the first hematopoietic CD4(+)CD3(-) appeared in the PP anlage. LTbetaR was expressed in the epithelium during PP organogenesis, making it a putative target for LTalpha(1)beta(2)si...Continue Reading

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