Expression of immediate early genes, HSP70, and COX-2 mRNAs in rat stomach following ethanol ingestion.

The aim of this study was to show the temporal and spatial molecular responses in the rat stomach that follow absolute ethanol-induced acute mucosal injury. Intense signals for immediate early genes (IEG)/transcriptional factors such as c-fos, c-jun, and nerve growth factor-induced gene-A (NGFI-A) mRNAs were observed in the superficial mucosa and in the blood vessels from 15 min to 6 hr after administration, peaking at 15-30 min. Signals for heat shock protein (HSP) 70 mRNA were also detected in the superficial mucosa, in the fibroblasts around gastric erosions, and in the blood vessels from 15 min to 6 hr (peak at 1-2 hr). The signals for cyclooxygenase-2 (COX-2) mRNA were up-regulated in the surface mucous cells that surround the erosions from 30 min to 6 hr (peak at 60-90 min). These findings suggest that IEG, HSP70, and COX-2 are involved in gastric mucosal restitution in different ways.