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CCAAT/Enhancer Binding Protein β2 Is Involved in Growth Hormone-Regulated Insulin-Like Growth Factor-II Gene Expression in the Liver of Rainbow Trout (Oncorhynchus mykiss).

Endocrinology.. 2010-05;  151(5):2128 - 2139
Jay H. Lo and Thomas T. Chen. Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut 06269, USA.
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摘要

Previously, we showed that levels of different CCAAT/enhancer binding protein (C/EBP) mRNAs in the liver of rainbow trout were modulated by GH and suggested that C/EBPs might be involved in GH-induced IGF-II gene expression. As a step toward further investigation, we have developed monospecific polyclonal antibodies to detect rainbow trout C/EBPalpha, -beta1, -beta2, and -delta2 isoform proteins. Injection of GH into adult rainbow trout resulted in a significant increase of C/EBPbeta1, C/EBPbeta2, and C/EBPdelta2 proteins in the liver. Chromatin immunoprecipitation analysis revealed that C/EBPbeta2 binds to multiple sites at the 5' promoter/regulatory region, introns, and the 3' untranslated region of... More

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