期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 284, 期 52, 页码 36047-36054出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M109.025387
关键词
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资金
- Wellcome Trust [076472/Z/05/Z]
- Medical Research Council [G0401662]
- Medical Research Council [G0401662] Funding Source: researchfish
- MRC [G0401662] Funding Source: UKRI
Corticosteroids are potent anti-inflammatory agents, but corticosteroid insensitivity is a major barrier for the treatment of some chronic inflammatory diseases. Here, we show that hypoxia induces corticosteroid-insensitive inflammation via reduced transcription of histone deacetylase-2 (HDAC2) in lung epithelial and macrophage cells. HDAC2 mRNA and protein expression was reduced under hypoxic conditions (1% O-2). Hypoxia enhanced interleukin-1 beta-induced interleukin-8 (CXCL8) production in A549 cells and decreased the ability of dexamethasone to suppress the CXCL8 production. Deletion or point mutation studies revealed that binding of the transcription factor hypoxia-inducible factor (HIF) 1 alpha to a HIF response element at position -320, but not HIF-1 beta or HIF-2 alpha, results in reduced polymerase II binding at the site, leading to reduced promoter activity of HDAC2. Our results suggest that activation of HIF-1 alpha by hypoxia decreases HDAC2 levels, resulting in amplified inflammation and corticosteroid resistance.
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