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Low‐Intensity Ultrasound Enhances Histone Acetylation and Inhibition of Interleukin 6 Messenger RNA Expression by the Histone Deacetylase Inhibitor Sodium Butyrate in Fibroblasts
Author(s) -
Maeshige Noriaki,
Koga Yuka,
Tanaka Masayuki,
AoyamaIshikawa Michiko,
Miyoshi Makoto,
Usami Makoto,
Fujino Hidemi
Publication year - 2017
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/ultra.16.04020
Subject(s) - sodium butyrate , medicine , histone deacetylase 2 , acetylation , hdac11 , histone deacetylase 5 , histone deacetylase , histone deacetylase inhibitor , histone , hdac10 , messenger rna , microbiology and biotechnology , cancer research , biochemistry , dna , gene , biology
Objectives Sodium butyrate, an inhibitor of histone deacetylase, has several therapeutic actions, including anti‐inflammation. These actions depend on the concentration of sodium butyrate. In addition, lower concentrations have shown no effect on inflammation. Sonoporation by ultrasound can modify the permeability of the cell plasma membrane. Thus, the effects of sodium butyrate may be enhanced by the ultrasonic acoustics. Therefore, the facilitative effects of low‐intensity ultrasound on histone acetylation and interleukin 6 (IL‐6) regulation by sodium butyrate were investigated in this study. Methods Human dermal fibroblasts were treated with 1‐mM sodium butyrate for 3 hours with 20 minutes of 0.1‐W/cm 2 pulsed or continuous ultrasound irradiation at the beginning of the sodium butyrate treatments. Results The combination of treatments with sodium butyrate and ultrasound significantly increased histone acetylation in fibroblasts ( P < .05), whereas sodium butyrate could not increase histone acetylation. In addition, this combined treatment significantly suppressed the IL‐6 messenger RNA expression level with lipopolysaccharide stimulation for 1 hour ( P < .05). Meanwhile, the treatment with sodium butyrate alone could not suppress IL‐6 messenger RNA expression in fibroblasts. These effects were achieved with both 20% pulsed and continuous ultrasound but not observed with ultrasound treatment alone. Conclusions These results suggest that low‐intensity ultrasound treatment promotes the physiologic actions of sodium butyrate as a histone deacetylase inhibitor.