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• W4313309903 endingPage "6724" @default.
• W4313309903 startingPage "6718" @default.
• W4313309903 abstract "Abstract The intestinal epithelium forms a physical barrier to limit access of enteric microbes to the host and contributes to innate host defense by producing effector molecules against luminal microbes. To further define the role of the intestinal epithelium in antimicrobial host defense, we analyzed the expression, regulation, and production of two antimicrobial peptides, human defensins hBD-1 and hBD-2, by human intestinal epithelial cells in vitro and in vivo. The human colon epithelial cell lines HT-29 and Caco-2 constitutively express hBD-1 mRNA and protein but not hBD-2. However, hBD-2 expression is rapidly induced by IL-1α stimulation or infection of those cells with enteroinvasive bacteria. Moreover, hBD-2 functions as a NF-κB target gene in the intestinal epithelium as blocking NF-κB activation inhibits the up-regulated expression of hBD-2 in response to IL-1α stimulation or bacterial infection. Caco-2 cells produce two hBD-1 isoforms and a hBD-2 peptide larger in size than previously described hBD-2 isoforms. Paralleling the in vitro findings, human fetal intestinal xenografts constitutively express hBD-1, but not hBD-2, and hBD-2 expression, but not hBD-1, is up-regulated in xenografts infected intraluminally with Salmonella. hBD-1 is expressed by the epithelium of normal human colon and small intestine, with a similar pattern of expression in inflamed colon. In contrast, there is little hBD-2 expression by the epithelium of normal colon, but abundant hBD-2 expression by the epithelium of inflamed colon. hBD-1 and hBD-2 may be integral components of epithelial innate immunity in the intestine, with each occupying a distinct functional niche in intestinal mucosal defense." @default.
• W4313309903 created "2023-01-06" @default.
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• W4313309903 date "1999-12-15" @default.
• W4313309903 modified "2023-10-18" @default.
• W4313309903 title "Expression and Regulation of the Human β-Defensins hBD-1 and hBD-2 in Intestinal Epithelium" @default.
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• W4313309903 doi "https://doi.org/10.4049/jimmunol.163.12.6718" @default.
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