Autoantibodies against desmoglein 1 and 3 are associated with which condition?

• A. Pemphigus vulgaris
• B. Bullous pemphigoid
• C. Lichen planus
• D. Dermatitis herpetiformis

Answer: (A)

The presence of autoantibodies against desmoglein 1 and 3 is characteristic of pemphigus vulgaris, a serious autoimmune blistering disorder. Desmogleins are adhesion molecules that are critical for maintaining the integrity of desmosomes, which are structures that help cells stick together in the epidermis. In pemphigus vulgaris, autoantibodies disrupt the function of these molecules, leading to a loss of cell-to-cell adhesion (acantholysis) and resulting in the formation of painful blisters in the skin and mucous membranes.

In contrast, other conditions listed are associated with different types of autoantibodies or underlying mechanisms. For instance, bullous pemphigoid is primarily associated with antibodies against hemidesmosomal proteins, while lichen planus is linked to a T-cell-mediated response and has no direct association with desmogleins. Dermatitis herpetiformis is related to gluten sensitivity and involves deposits of IgA antibodies in the skin, not desmoglein autoantibodies. Therefore, the specific involvement of desmoglein 1 and 3 autoantibodies distinctly identifies pemphigus vulgaris as the correct answer to the question.