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http://dx.doi.org/10.5483/BMBRep.2014.47.4.084

Cyclic AMP response element binding (CREB) protein acts as a positive regulator of SOX3 gene expression in NT2/D1 cells  

Kovacevic-Grujicic, Natasa (Institute of Molecular Genetics and Genetic Engineering, University of Belgrade)
Mojsin, Marija (Institute of Molecular Genetics and Genetic Engineering, University of Belgrade)
Popovic, Jelena (Institute of Molecular Genetics and Genetic Engineering, University of Belgrade)
Petrovic, Isidora (Institute of Molecular Genetics and Genetic Engineering, University of Belgrade)
Topalovic, Vladanka (Institute of Molecular Genetics and Genetic Engineering, University of Belgrade)
Stevanovic, Milena (Institute of Molecular Genetics and Genetic Engineering, University of Belgrade)
Publication Information
BMB Reports / v.47, no.4, 2014 , pp. 197-202 More about this Journal
Abstract
SOX3 is one of the earliest neural markers in vertebrates, playing the role in specifying neuronal fate. In this study we have established first functional link between CREB and human SOX3 gene which both have important roles in the nervous system throughout development and in the adulthood. Here we demonstrate both in vitro and in vivo that CREB binds to CRE half-site located -195 to -191 within the human SOX3 promoter. Overexpression studies with CREB or its dominant-negative inhibitor A-CREB indicate that this transcription factor acts as a positive regulator of basal SOX3 gene expression in NT2/D1 cells. This is further confirmed by mutational analysis where mutation of CREB binding site results in reduction of SOX3 promoter activity. Our results point at CREB as a positive regulator of SOX3 gene transcription in NT2/D1 cells, while its contribution to RA induction of SOX3 promoter is not prominent.
Keywords
CREB; NT2/D1 cells; Retinoic acid; SOX3; Transcription regulation;
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