Epigenetic changes: An emerging potential pharmacological target in allergic rhinitis

Area of Science:

• Immunology
• Epigenetics
• Allergic Diseases

Background:

• Epigenetics, including histone deacetylase (HDAC) activity, DNA methylation, and microRNA (miRNA) levels, is increasingly recognized in the pathophysiology of allergic rhinitis.
• Elevated HDAC1, 3, and 11 levels in nasal epithelia are observed in allergic rhinitis patients.
• Increased DNA methyltransferase (DNMT) activity and altered miRNA profiles are also implicated in allergic rhinitis.

Purpose of the Study:

• To review the epigenetic alterations in host cells in response to allergens in allergic rhinitis.
• To discuss the potential mechanisms underlying these epigenetic changes.
• To highlight the therapeutic potential of targeting epigenetic modifications in allergic rhinitis.

Main Methods:

• Review of existing literature on epigenetic mechanisms in allergic rhinitis.
• Analysis of studies investigating the role of HDACs, DNMTs, and miRNAs.
• Examination of the impact of epigenetic modifications on immune responses and disease symptoms.

Main Results:

• HDAC inhibitors demonstrate effectiveness in alleviating rhinitis symptoms by restoring gene expression and immune balance (Th1/Th2).
• Reduced DNA methylation is associated with decreased allergic symptoms and immune system normalization.
• Specific miRNAs are downregulated (e.g., miR-135a, miR-146a) while others are upregulated (e.g., miRNA19a) in allergic rhinitis patients.

Conclusions:

• Epigenetic dysregulation, including aberrant HDAC activity, DNA methylation, and miRNA expression, significantly contributes to allergic rhinitis.
• Targeting epigenetic pathways offers promising therapeutic strategies for managing allergic rhinitis.
• Further research into these mechanisms can lead to novel treatment approaches for allergic diseases.