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Cyclic AMP response element binding protein (CREB) participates in the heat-inducible expression of humanhsp90β gene

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Chinese Science Bulletin

Abstract

Human heat shock protein 90β gene (hsp90β) is a constitutively expressed heat shock gene existing in most of cell types tested that can be further induced by heat shock. Chloramphenical acetyl transferase (CAT) reporter plasmids driven by different regulatory fragments ofhsp90β gene were constructed and transfected into Jurkat cells to explore the role of a cAMP response element (CRE) in the upstream of the gene. Results show that, in comparison with the wild type construct, a severe reduction (∼2/3) in the increased folds of promoter activity induced by heat shock at 42 °C for 1 h was observed in a construct with CRE-containing fragment (−173/−91bp) deleted. Electrophoretic mobility shift assays (EMSA) showed that phosphorylated CRE-binding protein (CREB) in the nuclear extract of heat shocked Jurkat cells is specifically bound to the fragment. Additionally, both of the phosphorylation on CREB and the activity of protein kinase A (PKA) were found in Jurkat cells to be enhanced with extending time of heat shock treatment. Our results indicate that in addition to the intronic HSE/HSF pathway, phosphorylated CREB also participates in the heat shock induced expression of humanhsp90β gene via its interaction with CRE which may be regulated by PKA-signaling pathway.

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Authors and Affiliations

  1. National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, and Peking Union Medical College, 100005, Beijing, China

    Bingsheng Liu, Ninghua Wu & Yufei Shen

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  1. Bingsheng Liu
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  2. Ninghua Wu
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  3. Yufei Shen
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Liu, B., Wu, N. & Shen, Y. Cyclic AMP response element binding protein (CREB) participates in the heat-inducible expression of humanhsp90β gene. Chin.Sci.Bull. 46, 1645–1648 (2001). https://doi.org/10.1007/BF02900627

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  • DOI: https://doi.org/10.1007/BF02900627

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