SAHA inhibits lung fibroblast activation by increasing p66Shc expression epigenetically

Area of Science:

• Pulmonary Medicine
• Cell Biology
• Epigenetics

Background:

• Lung fibroblast activation is a key process in pulmonary fibrosis.
• The role of p66Shc in lung fibroblast activation and its modulation by SAHA requires further investigation.

Purpose of the Study:

• To investigate the effects of suberoylanilide hydroxamic acid (SAHA) on lung fibroblast activation.
• To examine the role of p66Shc in SAHA-mediated modulation of lung fibroblast activation.

Main Methods:

• An in vitro pulmonary fibrosis model using TGF-β-induced MRC-5 lung fibroblasts was established.
• Cell proliferation, migration, gene expression, protein levels, mitochondrial ROS, and histone modifications were assessed following SAHA treatment and/or p66Shc silencing.
• Techniques included Western blot, immunofluorescence, mito-SOX assay, and ChIP assay.

Main Results:

• SAHA inhibited proliferation, migration, and expression of fibrosis markers (collagen I, α-SMA) in TGF-β-induced lung fibroblasts.
• SAHA increased p66Shc expression and mitochondrial ROS generation.
• Silencing p66Shc reversed the inhibitory effects of SAHA.
• SAHA enhanced active histone markers (H3K9Ac, H3K4Me3) in the p66Shc gene region.

Conclusions:

• SAHA alleviates lung fibroblast activation and migration.
• This effect is mediated by increased p66Shc expression and mitochondrial ROS generation.
• Epigenetic modifications of histone 3 are involved in SAHA's mechanism of action.