Acantholysis is seen in:March 2012
**Core Concept**
Acantholysis is a process in which there is loss of intercellular connections between keratinocytes in the epidermis, leading to the formation of intraepidermal blisters. This phenomenon is characteristic of certain skin diseases, particularly those that involve the disruption of desmosomal attachments.
**Why the Correct Answer is Right**
Acantholysis is a hallmark feature of pemphigus, a group of autoimmune diseases that result from the production of autoantibodies against desmoglein 3 and desmoglein 1 proteins. These proteins are crucial for maintaining the integrity of desmosomes, which are specialized adhesion complexes that hold keratinocytes together. When these proteins are targeted by autoantibodies, the desmosomes are disrupted, leading to acantholysis and the formation of intraepidermal blisters.
**Why Each Wrong Option is Incorrect**
* **Option A:** Bullous pemphigoid is an autoimmune disease that involves the formation of subepidermal blisters, not intraepidermal blisters, and is characterized by the presence of autoantibodies against components of the basement membrane zone, not desmoglein proteins.
* **Option B:** Eczema is a chronic inflammatory skin disease characterized by a complex interplay of immune cells, cytokines, and chemokines, but it does not typically involve acantholysis or the formation of intraepidermal blisters.
* **Option C:** Lichen planus is an inflammatory skin disease that involves the formation of colloid bodies and the disruption of the basement membrane zone, but it does not typically involve acantholysis.
**Clinical Pearl / High-Yield Fact**
Acantholysis is a key diagnostic feature of pemphigus, and the presence of intraepidermal blisters, particularly those that are flaccid and easily ruptured, should raise suspicion for this condition.
**Correct Answer:** C.