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Research ArticleArticle

Poly(C) Binding Protein Family Is a Transcription Factor in μ-Opioid Receptor Gene Expression

Sung-Su Kim, Krishan K. Pandey, Hack Sun Choi, Seong-Youl Kim, Ping-Yee Law, Li-Na Wei and Horace H. Loh
Molecular Pharmacology September 2005, 68 (3) 729-736; DOI: https://doi.org/10.1124/mol.105.012245
Sung-Su Kim
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Krishan K. Pandey
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Hack Sun Choi
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Seong-Youl Kim
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Ping-Yee Law
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Li-Na Wei
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Horace H. Loh
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Abstract

The mouse μ-opioid receptor (MOR) gene has two promoters, referred to as distal and proximal promoter. Previously, our colleagues reported that a 26-base pair (bp) cis-acting element of the mouse MOR gene activates MOR gene expression. Here, we report the cloning of four members of the poly(C) binding protein (PCBP) family and show that the 26-bp polypyrimidine stretch in MOR proximal promoter interacts with these PCBPs and activates MOR transcription. The PCBPs bind not only to single-stranded but also to double-stranded DNA. The nuclear run-off assay and semiquantitative RT-PCR shows that PCBPs enhance the transcription rate of MOR gene. Furthermore, we performed refined mapping to elucidate the core region (-317/-304) involved in mediating the PCBP-induced MOR promoter activity. Decoy oligonucleotides against the polypyrimidine stretch inhibit the PCBP-induced MOR promoter activity, thereby reconfirming the role of this element in regulating MOR promoter activity. Chromatin immunoprecipitation assay confirmed the interaction of PCBPs with MOR promoter in vivo. In conclusion, we demonstrate that PCBPs act as a transcription factor and positively regulate MOR gene expression in NMB cells.

  • Received February 23, 2005.
  • Accepted June 1, 2005.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 68 (3)
Molecular Pharmacology
Vol. 68, Issue 3
1 Sep 2005
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Research ArticleArticle

Poly(C) Binding Protein Family Is a Transcription Factor in μ-Opioid Receptor Gene Expression

Sung-Su Kim, Krishan K. Pandey, Hack Sun Choi, Seong-Youl Kim, Ping-Yee Law, Li-Na Wei and Horace H. Loh
Molecular Pharmacology September 1, 2005, 68 (3) 729-736; DOI: https://doi.org/10.1124/mol.105.012245

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Research ArticleArticle

Poly(C) Binding Protein Family Is a Transcription Factor in μ-Opioid Receptor Gene Expression

Sung-Su Kim, Krishan K. Pandey, Hack Sun Choi, Seong-Youl Kim, Ping-Yee Law, Li-Na Wei and Horace H. Loh
Molecular Pharmacology September 1, 2005, 68 (3) 729-736; DOI: https://doi.org/10.1124/mol.105.012245
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