Hydrogen sulfide attenuates cytokine production through the modulation of chromatin remodeling

Rios,Ester  C.S.; Szczesny,Bartosz; Soriano,Francisco G.; Olah,Gabor; Szabo,Csaba

doi:10.3892/ijmm.2015.2176

Hydrogen sulfide attenuates cytokine production through the modulation of chromatin remodeling

Authors:
- Ester C.S. Rios
- Bartosz Szczesny
- Francisco G. Soriano
- Gabor Olah
- Csaba Szabo
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Affiliations: Department of Anesthesiology, University of Texas Medical Branch, Galveston, TX, USA, Department of Emergency Medicine, University of São Paulo Medical School, São Paulo, Brazil
Published online on: April 8, 2015 https://doi.org/10.3892/ijmm.2015.2176
Pages: 1741-1746

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Abstract

Hydrogen sulfide (H2S) is an endogenous gaseous biological mediator, which regulates, among others, the oxidative balance of cells under normal physiological conditions, as well as in various diseases. Several previous studies have reported that H2S attenuates inflammatory mediator production. In this study, we investigated the role of H2S in chromatin modulation in an in vitro model of lipopolysaccharide (LPS)-induced inflammation and evaluated its effects on inflammatory cytokine production. Tamm-Horsfall protein 1 (THP-1) differentiated macrophages were pre-treated with sodium hydrosulfide (NaHS) (an H2S donor) at 0.01, 0.1, 0.5 or 1 mM for 30 min. To stimulate cytokine production, the cells were challenged with bacterial LPS (1 µg/ml) for 1, 4, 8 or 24 h. Histone H3 acetylation was analyzed by chromatin immunoprecipitation (ChIP), cytokine production was measured by ELISA and histone deacetylase (HDAC) activity was analyzed using a standard biochemical assay. H2S inhibited the production of interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) in a concentration-dependent manner; it was most effective at the two highest concentrations used. This effect was associated with a decrease in histone H3 acetylation at the IL-6 and TNF-α promoters in the cells exposed to H2S or H2S + LPS. The findings of the present study suggest that H2S suppresses histone acetylation, which, in turn, inhibits chromatin openness, leading to a decrease in the gene transcription of various pro-inflammatory cytokines. Therefore, this mechanism may contribute to the previously demonstrated anti-inflammatory effects of H2S and various H2S donors.

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