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The Journal of Immunology, Vol 155, Issue 10 4535-4543, Copyright © 1995 by American Association of Immunologists

ARTICLES

Cyclic AMP signaling pathways are important in IL-1 beta transcriptional regulation

G Chandra, JP Cogswell, LR Miller, MM Godlevski, SW Stinnett, SL Noel, SH Kadwell, TA Kost and JG Gray
Department of Molecular Genetics, Glaxo Research Institute, Inc., Research Triangle Park, NC 27709, USA.

An intact cAMP response element (CRE) in the upstream regulatory sequence of IL-1 beta (-2755/-2762) has been shown to be essential for maintaining full IL-1 beta inducibility following treatment with LPS, PMA, or TNF-alpha. In the present study, using the recombinant plasmid pIL-1(4.0 kb)-chloramphenicol acetyltransferase, containing 4.0 kb of the IL-1 beta upstream regulatory sequence, we have demonstrated that dibutyryl cAMP treatment alone is capable of induction. Due to the critical nature of the CRE for the induction of IL-1 beta transcription, an effort was made to determine the importance of the cAMP signaling pathway(s) by determining whether CRE binding protein (CREB) and other CREB/activating transcription factor (ATF) family members that responded to cAMP were associated with the DNA-protein complex that forms at this site. Nuclear extracts prepared from LPS- treated THP-1 5A cells were fractionated by ammonium sulfate precipitation and heparin-Sepharose chromatography, and the resulting fractions were characterized in electrophoretic gel mobility shift assays. These purification steps resulted in an approximately 100-fold enrichment of the proteins binding to the CRE site. Western blot analysis of isolated fractions, using CREB- and ATF-1-specific Ab showed an increased level of these proteins in the enriched fractions. Tryptic digest and DNase I protection studies showed the presence of CREB protein in the complex at the CRE site. Supershift electrophoretic gel mobility shift assays and immunoprecipitation analysis provided further evidence that both CREB and ATF-1 are present in the complex. In addition, an increase in CREB phosphorylation was observed when THP- 1 5A cells were treated with dibutyryl cAMP, LPS, or both. These studies confirm the importance of a cAMP signaling pathway(s) in the regulation of IL-1 beta at the transcriptional level.


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