Abstract
Lipopolysaccharide (LPS) treatment causes the marked changes of gene expression in macrophages. Tristetraprolin (TTP), which is an mRNA-destabilizing protein that negatively regulates the expression of pro-inflammatory mediators, is induced by LPS. To delineate the molecular mechanism of LPS-stimulated TTP expression, several inhibitors blocking different signaling pathways were used initially. We observed that inhibitors of the NF-κB signaling pathway could down-regulate the TTP expression during LPS-induction. Consistently, TTP expression was increased upon recombinant TNFα stimulation which activates NF-κB signaling. The 5′ regulatory region of zfp36 gene spanning from −2 k to +50 was isolated, which contained a putative NF-κB–binding site located in −1859 to −1850. Analysis of luciferase reporter activity driven by a serial 5′-deletion of TTP promoter showed that NF-κB inhibitor-mediated suppression of LPS or TNFα induced activity was through the predicted κB-binding sites. When the NF-κB-binding site was mutated, the TTP promoter decreased its response to the ectopic expression of NF-κB. Physical interaction analysis including oligonucleotides competition, gel shift and chromatin immunoprecipitation assays demonstrated that NF-κB activated by LPS or TNFα bound to the TTP promoter specifically. These results suggested that during LPS stimulation, NF-κB signaling were activated to regulate the transcription of TTP mRNA.
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Abbreviations
- ARE:
-
AU-rich element
- ChIP:
-
Chromatin-immunoprecipitation
- EMSA:
-
Electrophoretic mobility shift assay
- LPS:
-
Lipopolysaccharide
- MAPK:
-
Mitogen-activated protein kinase
- NF-κB:
-
Nuclear factor-kappa B
- RT-PCR:
-
Reverse transcription-polymerase chain reaction
- STAT:
-
Signal transduction and activator of transcription
- TLR:
-
Toll-like receptor
- TNFα:
-
Tumor necrosis factor-alpha
- TTP:
-
Tristetraprolin
- UTR:
-
Untranslated region
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Acknowledgments
We thank Dr. Bertrant C.M. Tan for the critical reading the manuscript; Ms Yi-Li Liu and I-Ching Huang for technical support on DNA sequencing (ABI 3730) supported in part by Department of Medical Research in NTUH. This study was supported by Academia Sinica and a grant from National Taiwan University (96R0066-33 to M.-S. Chang) and a grant from the National Science Council (NSC97-2311-B-001-019-MY3 to C.-J. Chang).
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Chen, YL., Jiang, YW., Su, YL. et al. Transcriptional regulation of tristetraprolin by NF-κB signaling in LPS-stimulated macrophages. Mol Biol Rep 40, 2867–2877 (2013). https://doi.org/10.1007/s11033-012-2302-8
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DOI: https://doi.org/10.1007/s11033-012-2302-8