Abstract:
:The clinical phenotype in sepsis that is observed as LPS tolerance is determined by silencing of pro-inflammatory genes like IL-1 beta (IL-1β). This study shows that facultative heterochromatin (fHC) silences IL-1β expression during sepsis, where we find dephosphorylated histone H3 serine 10 and increased binding of heterochromatin protein-1 (HP-1) to the promoter. In both human sepsis blood leukocytes and an LPS tolerant human THP-1 cell model, we show that IκBα and v-rel reticuloendotheliosis viral oncogene homolog B (RelB) function as dominant labile mediators of fHC formation at the IL-1β promoter. Protein synthesis inhibition decreases levels of IκBα and RelB, converts silent fHC to euchromatin, and restores IL-1β transcription. We further show TLR dependent NFκB p65 and histone H3 serine 10 phosphorylation binding at the promoter. We conclude that the resolution phase of sepsis, which correlates with survival in humans, may depend on the plasticity of chromatin structure as found in fHC.
journal_name
Cytokinejournal_title
Cytokineauthors
Yoza BK,McCall CEdoi
10.1016/j.cyto.2010.10.007subject
Has Abstractpub_date
2011-02-01 00:00:00pages
145-52issue
2eissn
1043-4666issn
1096-0023pii
S1043-4666(10)00702-7journal_volume
53pub_type
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