Hypoxia is an integral component of the inflamed tissue microenvironment. Today, the influence of hypoxia on the natural evolution of inflammatory responses is widely accepted; however, many molecular and cellular mechanisms mediating this relationship remain to be clarified. Hypoxic stress affects several independent transcriptional regulators related to inflammation in which HIF-1 and NF-κB play central roles. Transcription factors interact with both HATs and HDACs, which are components of large multiprotein co-regulatory complexes. This review summarizes the current knowledge on hypoxia-responsive transcriptional pathways in inflammation and their importance in the etiology of chronic inflammatory diseases, with the primary focus on transcriptional co-regulators and histone modifications in defining gene-specific transcriptional responses in hypoxia, and on the recent progress in the understanding of hypoxia-mediated epigenetic reprogramming. Furthermore, this review discusses the molecular cross-talk between glucocorticoid anti-inflammatory pathways and hypoxia.
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