Humanization of autoantigen.

Area of Science:

• Immunodermatology
• Autoimmune disease modeling
• Genetically engineered mouse models

Background:

• Bullous pemphigoid (BP) is a common, severe autoimmune blistering skin disease.
• Collagen XVII (COL17) is the suspected autoantigen in BP, but passive antibody transfer in mice is ineffective.
• Species-specific differences in the COL17 pathogenic epitope likely hinder murine models.

Purpose of the Study:

• To develop a reproducible animal model for human bullous pemphigoid.
• To investigate the pathomechanism of BP using genetically engineered mice.
• To establish a novel approach for studying human autoimmune diseases via autoantigen humanization.

Main Methods:

• Generation of Col17-knockout mice expressing the human COL17 ortholog.
• Injection of human BP autoantibodies into these humanized mice.
• Observation and analysis of induced skin lesions and disease phenotype.

Main Results:

• The humanized mouse model developed BP-like skin lesions.
• The induced phenotype closely mimicked human bullous pemphigoid.
• Successful reproduction of a human autoimmune disease in a genetically engineered model.

Conclusions:

• Humanizing autoantigens is a viable strategy for creating accurate animal models of human autoimmune diseases.
• This approach facilitates the study of autoimmune disease pathomechanisms.
• The developed model offers new avenues for understanding and potentially treating bullous pemphigoid.