Targeting inducible epigenetic reprogramming pathways in chronic airway remodeling

Area of Science:

• Immunology
• Molecular Biology
• Epigenetics

Background:

• Allergic asthma involves chronic airway inflammation and structural remodeling, often triggered by aeroallergens and viruses.
• These triggers activate toll-like receptor (TLR) signaling, leading to oxidative injury and inflammation.
• Repetitive exacerbations cause complex cellular adaptations and airway remodeling, decreasing lung function and quality of life.

Purpose of the Study:

• To review systems-level studies on how repetitive innate signaling pathway activation leads to epigenetic reprogramming.
• To explore the role of oxidative stress and the 8-oxoG/OGG1/NFκB·BRD4 pathway in airway inflammation and remodeling.
• To present evidence for small molecule inhibitors targeting this pathway as potential therapeutics.

Main Methods:

• Review of recent systems-level studies investigating innate immune signaling and epigenetic modifications.
• Analysis of the role of oxidative stress, 8-oxoguanine (8-oxoG), 8-oxoguanine DNA glycosylase (OGG1), and NFκB·bromodomain-containing protein 4 (BRD4) in airway inflammation.
• Presentation of preclinical data on small molecule inhibitors of OGG1-8-oxoG binding and BRD4 interactions.

Main Results:

• TLR signaling induces oxidative stress, creating the 8-oxoG epigenetic mark.
• OGG1 binding to 8-oxoG recruits the NFκB·BRD4 complex, driving inflammation and airway remodeling.
• Small molecule inhibitors targeting OGG1 and BRD4 demonstrated efficacy in reducing airway inflammation in preclinical models.

Conclusions:

• Targeting inducible epigenetic reprogramming pathways offers a promising therapeutic strategy.
• Interventions against the OGG1-8-oxoG-BRD4 axis may reverse airway remodeling in chronic airway diseases.
• This approach holds potential for treating various chronic inflammatory airway conditions.