Modulation of early growth response gene I and interieukin-8 expression by ribotoxin deoxynivalenol (vomitoxin) via ERK1/2 in human epithelial intestine 407 cells

Epithelium senses external toxic insults transmit the sentinel signals into the cells to reprogram a broad range of mucosal responses like epithelial inflammatory diseases. The purpose of this study was to test the hypothesis that ribotoxin DON evokes the epithelial sentinel signals which contributes to the pro-inflammatory cytokine interleukin-8 in human epithelial cells. Treatment with DON elevated interleukin-8 production in the human epithelial intestine 407 cells. Particularly, ribotoxin DON markedly elevated the phosphorylated extracellular signal-regulated protein kinases I and 2 (ERK1/2) mitogen-activated protein kinase (MAPK) which mediated DON-induced interleukin-8 (IL-8) production. DON-activated ERK1/2 also mediated the production of early growth response gene 1 (EGR-1) in the epithelial cell line and EGR-1 had the positive regulatory effect on the interleukin-8 production in the human epithelial cells. Taken all, DON-activated MAPK sentinel signals of the epithelial cells which promoted interleukin-8 production and its positive modulator EGR-1. These findings will provide insight into the possible mechanism associated with the early epithelial inflammation by ribotoxic insults. (C) 2007 Elsevier Inc. All rights reserved.