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- W2086362120 abstract "In the developing intestine, transcription of alpha-glucosidase genes such as sucrase-isomaltase and trehalase is stimulated by glucocorticoid administration. The consequent increase of their respective mRNAs is characterized by a 12-h lag, suggesting that the response to glucocorticoids represents a secondary effect. We hypothesized that the primary response of the tissue to glucocorticoids includes induction of one or more intestinal transcription factors. To investigate this hypothesis, we identified a region in the mouse trehalase promoter (located at nucleotides -406 to -377 from the transcription start site) with potential binding sites for three transcription factors: Cdx-2, GATA, and C/EBP. Gel shifts were performed using labeled oligonucleotides from this region with nuclear extracts from jejunums of either control 8-day-old mouse pups or littermates treated with dexamethasone (DEX) 4 h before death. A specific shifted band was observed with DEX extracts but not with control extracts. Supershift assays indicated the presence of GATA-4 and GATA-6 but not GATA-5 nor Cdx-2, C/EBP alpha, C/EBP beta, or C/EBP delta. GATA binding was further implicated by competition studies with mutated oligonucleotides. Finally, Western blot analysis showed GATA-4 and GATA-6 proteins in DEX but not control nuclear extracts. For GATA-4, the same pattern was demonstrated with whole cell extracts and with the cytosol fraction. We conclude that expression of GATA-4 and GATA-6 proteins in the suckling mouse jejunum is stimulated by DEX. This novel finding constitutes an important first step in understanding the molecular mechanism of glucocorticoid action on the developing intestine." @default.
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- W2086362120 date "2004-06-01" @default.
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- W2086362120 title "Rapid induction of GATA transcription factors in developing mouse intestine following glucocorticoid administration" @default.
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- W2086362120 doi "https://doi.org/10.1152/ajpgi.00470.2003" @default.
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