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Updated: May 27, 2026
09:17
Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
Published on: August 2, 2018
NFκB and HIF display synergistic behaviour during hypoxic inflammation
Ulrike Bruning1, Susan F Fitzpatrick, Till Frank
1Conway Institute, University College Dublin, Ireland.
Cellular and Molecular Life Sciences : CMLS
|November 10, 2011
Summary
Hypoxia-inducible factor (HIF) and nuclear factor kappa B (NFκB) show distinct temporal activities during hypoxic inflammation. These factors synergistically regulate cyclooxygenase-2 (COX-2) expression, highlighting their coordinated role.
Area of Science:
- Molecular biology
- Cellular signaling
- Inflammation research
Background:
- Hypoxia-inducible factor (HIF) regulates gene expression during hypoxia.
- Inflamed tissues often exhibit hypoxia.
- HIF and nuclear factor kappa B (NFκB) signaling are linked in hypoxic inflammation.
Purpose of the Study:
- To determine the temporal contributions of HIF and NFκB to gene expression in hypoxic inflammation.
- To investigate the crosstalk between HIF and NFκB pathways.
- To analyze the synergistic regulation of cyclooxygenase-2 (COX-2) by HIF and NFκB.
Main Methods:
- Utilized a novel Gaussia princeps luciferase (Gluc) reporter system to measure transcriptional dynamics.
- Constructed Gluc reporters under HIF and NFκB control for temporal analysis.
- Investigated pathway interactions using a COX-2 promoter construct with binding sites for both factors.
- Developed a mathematical model to analyze transcriptional crosstalk.
Main Results:
- Revealed distinct temporal transcriptional activities of HIF and NFκB in response to hypoxic inflammation.
- Demonstrated synergistic activity between HIF and NFκB on the COX-2 promoter.
- Identified a coordinated role for HIF and NFκB in COX-2 expression during hypoxic inflammation.
Conclusions:
- HIF and NFκB exhibit distinct temporal roles in hypoxic inflammation.
- Synergistic interaction between HIF and NFκB is crucial for COX-2 regulation in this context.
- These findings elucidate the molecular mechanisms underlying inflammatory gene expression in hypoxic conditions.
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