PMID: 11901219Mar 20, 2002Paper

Involvement of activator protein-1 in transcriptional regulation of the human mu-opioid receptor gene

Molecular Pharmacology
Christine BörnerJürgen Kraus

Abstract

mu-Opioid receptors mediate such opioid effects as analgesia, euphoria, and immunomodulation. Gene expression of mu-opioid receptors can be modulated by various substances, including cytokines, hormones, and drugs. Some of these stimuli (e.g., IL-1beta and cocaine) have been shown to activate members of the AP-1 transcription factor family. In addition, transcription of the mu-opioid receptor gene is induced by the phorbol ester 12-O-tetradecanoylphorbol-13-acetate (TPA), an activator of protein kinase C, which in turn is an activator of AP-1 transcription factors. This indicates that signaling pathways involving protein kinase C and activator protein 1 (AP-1) transcription factors are important for the specific expression pattern of the mu-opioid receptor gene. In this report, we show that TPA activates AP-1 as well as the transcription factor nuclear factor kappaB (NFkappaB) in the mu-opioid receptor expressing neuroblastoma cell line SH SY5Y. In transfection experiments performed in these cells, both factors trans-activate expression of reporter gene constructs containing the human mu-opioid receptor gene promoter. By excluding the effects of TPA on NFkappaB with the specific NFkappaB inhibitor sulfasalazine, AP-1 regulatory...Continue Reading

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Nov 13, 2003·Peptides·Richard J Bodnar, Maria M Hadjimarkou
May 27, 2008·Nature Immunology·Xiaoming WangXiaolong Liu
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