Which disease is caused by anti-phospholipase 2 antibody:
**Core Concept**
Anti-phospholipase 2 receptor (PLA2R) antibodies are associated with primary membranous nephropathy, a disease characterized by immune complex deposition in the glomerular basement membrane. The presence of these antibodies triggers an autoimmune response against the phospholipase 2 receptor, leading to renal damage.
**Why the Correct Answer is Right**
The correct answer is associated with primary membranous nephropathy. The anti-phospholipase 2 receptor antibody (PLA2R) is a specific autoantibody that targets the M-type phospholipase 2 receptor, leading to its endocytosis and subsequent immune complex formation. This triggers a complement-dependent cytotoxicity, resulting in the characteristic foot process effacement and proteinuria seen in primary membranous nephropathy.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not associated with the disease caused by anti-phospholipase 2 receptor antibodies.
**Option B:** This option is incorrect because it is associated with a different disease process.
**Option C:** This option is incorrect because it is not directly related to the disease caused by anti-phospholipase 2 receptor antibodies.
**Clinical Pearl / High-Yield Fact**
The presence of anti-phospholipase 2 receptor antibodies is a diagnostic hallmark of primary membranous nephropathy, and their detection can guide treatment decisions in patients with this condition. A high level of sensitivity and specificity for this antibody has been reported, making it a valuable tool in the diagnosis of primary membranous nephropathy.
**Correct Answer:** A. Primary membranous nephropathy.