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• W2144004310 endingPage "G1251" @default.
• W2144004310 startingPage "G1243" @default.
• W2144004310 abstract "We have previously shown heregulin (HRG)-α expression in human gastric fibroblasts and its stimulation of gastric epithelial cell growth. Although cyclooxygenase (COX)-2 has also been shown to stimulate growth factor production in these cells, the interaction between COX-2 and HRG remains unknown. Conditioned media (CM) from gastric fibroblasts incubated with PGE 2 or interleukin (IL)-1β, a well known COX-2 inducer, were analyzed for their effect on erbB3 tyrosine phosphorylation in MKN28 gastric epithelial cells. HRG protein expression in fibroblast lysates and CM was also examined by western blot. HRG-α and HRG-β mRNA expression in gastric fibroblasts and human gastric tissue was examined by real-time quantitative PCR. HRG and COX-2 expressions in surgical resections of human gastric ulcer tissue were examined immunohistochemically. CM from fibroblasts incubated with PGE 2 , or IL-1β, stimulated erbB3 phosphorylation in MKN28 cells. Preincubation of the fibroblasts with celecoxib, a selective COX-2 inhibitor, suppressed CM-induced erbB3 phosphorylation. This inhibition was reversed by exogenous PGE 2 . As with erbB3 phophorylation, IL-1β stimulated both HRG-α and HRG-β mRNA expression, as well as HRG release into gastric fibroblast CM. IL-1β-stimulated HRG expression and release were also inhibited by celecoxib, and exogenous PGE 2 restored this inhibitory effect, suggesting the activation of an IL-1β-COX-2-PGE 2 pathway that culminates in the release of HRG from fibroblasts. HRG-α and HRG-β mRNA levels were significantly higher in gastric ulcer tissue than in normal gastric mucosa. HRG immunoreactivity was found in interstitial cells of the gastric ulcer bed and coexpressed with COX-2. These results suggest that HRG might be a new member of the growth factor family involved in the COX-2-dependent ulcer repair process." @default.
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• W2144004310 date "2006-06-01" @default.
• W2144004310 modified "2023-10-17" @default.
• W2144004310 title "Heregulin-α and heregulin-β expression is linked to a COX-2-PGE2 pathway in human gastric fibroblasts" @default.
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• W2144004310 doi "https://doi.org/10.1152/ajpgi.00253.2005" @default.
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