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Endothelin-1 promotes phosphorylation of CREB transcription factor in primary cultures of neonatal rat cardiac myocytes: implications for the regulation of c-junexpression

Authors
Journal
Biochimica et Biophysica Acta (BBA) - Molecular Cell Research
0167-4889
Publisher
Elsevier
Publication Date
Volume
1644
Issue
1
Identifiers
DOI: 10.1016/j.bbamcr.2003.10.008
Keywords
  • Cardiac Myocyte
  • Immediate Early Gene
  • Intracellular Signaling
  • Creb
  • Mitogen-Activated Protein Kinase
Disciplines
  • Biology

Abstract

Abstract Cardiac myocyte hypertrophy is associated with an increase in expression of immediate early genes (e.g. c- jun) via activation of pre-existing transcription factors. The activity of CREB transcription factor is regulated through phosphorylation of Ser-133 by one of several protein kinases (e.g. protein kinase A (PKA), p90 ribosomal S6 kinases (RSKs) and the related kinase, MSK1). A cell-permeable form of cAMP, hypertrophic agonists (endothelin-1 (ET-1), phenylephrine (PE)) and hyperosmotic shock all promoted phosphorylation of CREB(Ser-133) in rat neonatal cardiac myocytes. The response to endothelin-1 required the extracellular signal-regulated kinase cascade which stimulates both RSKs and MSK1. Phosphorylation of CREB(Ser-133) in response to ET-1 was not associated with any increase in DNA binding to a consensus cAMP-response element (CRE). The rat c- jun promoter contains elements which may bind either c-Jun/ATF2 or CREB/ATF1 dimers. Using extracts from rat cardiac myocytes, we identified at least two complexes which bind to the most proximal of these elements, one of which contained CREB and the other c-Jun. Thus, phosphorylation and activation of CREB in cardiac myocytes may be effected by a range of different stimuli to influence the expression of immediate early genes such as c- jun.

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