Innate Immunity, Epithelial Plasticity, and Remodeling in Asthma

Area of Science:

• Immunology
• Cell Biology
• Pulmonology

Background:

• Epithelial innate immune responses (IIR) are crucial in asthma initiation and progression.
• Pattern recognition receptors (PRRs) activate intracellular signaling pathways central to IIR.
• The epithelium acts as a key innate sentinel cell, particularly in acute asthma exacerbations.

Purpose of the Study:

• To explore the role of epithelial IIR in asthma, focusing on acute exacerbations.
• To elucidate the mechanisms linking chronic IIR activation to mucosal adaptive responses.
• To investigate epithelial-mesenchymal plasticity (EMP) as a response to airway injury and remodeling.

Main Methods:

• Review of existing literature on IIR, NFκB signaling, and Th2 polarization.
• Analysis of recent research on the link between chronic IIR and adaptive immune responses.
• Examination of the role of unfolded protein response (UPR) and hexosamine biosynthetic pathway (HBP) in EMP.

Main Results:

• Chronic IIR activation is mechanistically linked to mucosal adaptive responses.
• Epithelial-mesenchymal plasticity (EMP) is a genomic response to airway injury, involving barrier disruption and remodeling.
• NFκB and UPR pathways interact to remodel the basement membrane.

Conclusions:

• Understanding epithelial injury-repair processes offers novel therapeutic targets for asthma.
• Targeting the interplay between IIR, EMP, and UPR may provide precision approaches for asthma exacerbations.
• EMP, driven by UPR and HBP, is a key adaptation in chronic airway remodeling.