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Novel function of neuronal PAS domain protein 1 in erythropoietin expression in neuronal cells
Author(s) -
Ohsawa Shizue,
Hamada Shun,
Kakinuma Yoshihiko,
Yagi Takeshi,
Miura Masayuki
Publication year - 2005
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/jnr.20365
Subject(s) - erythropoietin , enhancer , transcription factor , biology , pas domain , transcription (linguistics) , central nervous system , microbiology and biotechnology , basic helix loop helix , reporter gene , gene expression , neuroscience , gene , endocrinology , dna binding protein , genetics , linguistics , philosophy
The basic helix loop helix‐PAS (bHLH‐PAS) transcription factors have diverse roles in physiologic responses to the environment and in early development. One bHLH‐PAS protein, neuronal PAS domain protein 1 (NPAS1), is reported to be expressed only in the central nervous system beginning at the late embryonic stage, but its function is unknown. Using an anti‐NPAS1 antibody, we have shown that NPAS1 expression in cerebral cortex was observed first around embryonic Day 16.5 (E16.5) and was then dispersed throughout the region as cortical development progressed. From the similarity with hypoxia‐inducible factor‐1α (HIF‐1α), we investigated whether NPAS1 regulates transcription of erythropoietin (EPO), which is the target of HIF‐1α and is expressed in the brain during the early developmental stage. In the present study, we have shown that NPAS1 binds to the enhancer region of Epo in vivo. A luciferase reporter assay revealed a repressive effect of NPAS1 on hypoxia‐responsive element‐regulated gene expression. These results raise the possibility that NPAS1 plays a role in late central nervous system development by modulating EPO expression in response to cellular oxygen level. © 2005 Wiley‐Liss, Inc.