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• W4300705053 abstract "CCAAT/enhancer binding proteins are a family of basic zipper DNA binding proteins that regulate transcription of several liver-specific genes and certain growth-related genes. Growth-related variations in the nuclear expression of one or more of the CCAAT/enhancer binding proteins may regulate the transition from the nonproliferative, differentiated phenotype of adult liver to the proliferative phenotype of regenerating liver. To evaluate this possibility, we used Northern- and Western-blot analyses to profile the expression of selected CCAAT/enhancer binding proteins in regenerating liver. Variations in CCAAT/enhancer binding protein expression were then correlated with changes in binding to the CCAAT/enhancer binding protein site of the c-fos promoter. Expression of both CCAAT/enhancer binding protein α and CCAAT/enhancer binding protein β increases after partial hepatectomy. Steady-state levels of CCAAT/enhancer binding protein α mRNA increase 30 within an hour of partial hepatectomy (p < 0.05). This is followed by a transient increase in nuclear levels of CCAAT/enhancer binding protein α protein at 3 hr after partial hepatectomy (p = 0.08). In contrast, increases in CCAAT/enhancer binding protein β mRNA and protein are more sustained. Levels of CCAAT/enhancer binding protein β mRNA increase 400 to 500 within an hour of partial hepatectomy and remain increased throughout most of the prereplicative period (p < 0.01). Nuclear levels of CCAAT/enhancer binding protein β protein are 200 to 300 greater than prehepatectomy levels at 3 hr (p < 0.001) to 6 hr (p < 0.05) and do not approach basal levels until 24 hr after partial hepatectomy. Gel mobility shift assays of nuclear extracts from regenerating livers indicate that these increases in nuclear protein expression are associated with increased DNA binding of CCAAT/enhancer binding protein α-β heterodimers and β-β homodimers. These results demonstrate growth-related variations in the expression and DNA binding of both CCAAT/enhancer binding protein α and β during liver regeneration and support the theory that altered CCAAT/enhancer binding protein DNA binding may contribute to regeneration-associated changes in liver cell phenotype. (Hepatology 1994;19:447–456)." @default.
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• W4300705053 date "1994-02-01" @default.
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• W4300705053 title "Regenerative changes in C/EBPα and C/EBPß expression modulate binding to the C/EBP site in the c-fos promoter" @default.
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• W4300705053 doi "https://doi.org/10.1002/hep.1840190225" @default.
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