BP180 dysfunction triggers spontaneous skin inflammation in mice

Area of Science:

• Dermatology
• Immunology
• Molecular Biology

Background:

• BP180 (collagen XVII) is crucial for skin adhesion.
• BP180 dysfunction causes blistering in junctional epidermolysis bullosa and bullous pemphigoid.
• The role of BP180 in skin inflammation was previously unknown.

Purpose of the Study:

• To investigate the role of BP180 in skin inflammation.
• To determine if BP180 dysfunction leads to inflammatory skin conditions.
• To elucidate the mechanisms underlying BP180-related skin inflammation.

Main Methods:

• Generation of a BP180-dysfunctional mouse model (ΔNC16A).
• Characterization of skin inflammation, immune cell infiltration, and serum IgE levels.
• Assessment of thymic stromal lymphopoietin (TSLP) expression in mice and human patients.

Main Results:

• BP180-dysfunctional mice developed spontaneous inflammatory skin disease with severe itch.
• Itch was independent of adaptive immunity and histamine but dependent on TSLP.
• Elevated TSLP expression was observed in both the mouse model and bullous pemphigoid patients.

Conclusions:

• BP180 regulates skin inflammation independently of adaptive immunity.
• BP180 dysfunction triggers a TSLP-mediated itch.
• The developed mouse model is valuable for studying skin inflammation and developing therapies for BP180-related conditions.