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  • Original Paper
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Transcriptional regulation of the promoter of the rat frizzled related protein gene by CREB

Oncogene volume 22, pages 3901–3910 (2003)Cite this article

Abstract

Frizzled related proteins (Frps) are secreted proteins structurally similar to frizzled receptors; they bind Wnt via the cysteine-rich domain and antagonize the Wnt signaling pathway. In this study, we have investigated the mechanisms regulating the transcriptional regulation of rat Frp (rFrp) promoter. From previous findings, we know that the transcriptional activation domain of rFrp resides in the region −202 to −144 relative to the transcription start site, and that it is essential for efficient promoter activity. The study presented here was designed to identify trans-acting factors that bind to this critical domain of the rFrp promoter and to elucidate the pathway involved in the regulation of rFrp expression. Electrophoretic mobility shift assay (EMSA) demonstrated that specific DNA–protein binding activities fall into two adjacent core sequences with (CTTTGGGGG) at −197 to −189 and (AGATGATGTAA) at −151 to −141 of the rFrp promoter. Reporter assay showed that these core sequences are both required for the activation of rFrp promoter. Mutation within either one or both core sequence drastically reduced the promoter activity. Southwestern blotting showed that the estimated molecular mass of the distinct binding protein to the (AGATGATGTAA) domain is about 43 kDa. Further EMSA suggested CREB as the trans-acting factor in the DNA–protein complex, which was out competed by CREB consensus oligonucleotides and supershifted by anti-CREB antibody. Overexpression of PKA and CREB also transactivated rFrp promoter, and dominant-negative CREB inhibited the promoter activity in transient reporter assays. More importantly, CREB, phosphorylated CREB and the adaptor protein CBP were found binding to the endogenous rFrp promoter using chromatin immunoprecipitation assay. Collectively, our results demonstrate the induction of rFrp promoter activity by PKA and CREB in vitro, and the binding of CREB and CBP to the rFrp promoter core motif in vivo.

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Acknowledgements

This work was supported by RGC-HKUST6175/02 M to WLW Hsaio.

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  1. Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China

    Judy Wai Ping Yam, Koon Wing Chan & W L Wendy Hsiao

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  1. Judy Wai Ping Yam
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Correspondence to W L Wendy Hsiao.

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Yam, J., Chan, K. & Hsiao, W. Transcriptional regulation of the promoter of the rat frizzled related protein gene by CREB. Oncogene 22, 3901–3910 (2003). https://doi.org/10.1038/sj.onc.1206489

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