All are TRUE about Goodpasture’s syndrome, EXCEPT:
**Goodpasture's Syndrome**
**Core Concept**
Goodpasture's syndrome is a rare autoimmune disorder characterized by the presence of anti-glomerular basement membrane (anti-GBM) antibodies, which target the glomerular basement membrane (GBM) and pulmonary alveolar basement membrane. This leads to rapidly progressive glomerulonephritis (RPGN) and pulmonary hemorrhage.
**Why the Correct Answer is Right**
The anti-GBM antibodies in Goodpasture's syndrome bind to the alpha-3 chain of type IV collagen in the GBM, leading to complement activation, inflammation, and eventual damage to the kidney glomeruli. This results in RPGN, characterized by severe hematuria, proteinuria, and acute kidney injury. The pulmonary involvement is due to similar antibody binding in the alveolar basement membrane, causing pulmonary hemorrhage and respiratory failure.
**Why Each Wrong Option is Incorrect**
**Option A:** This statement is likely true, as Goodpasture's syndrome is indeed associated with the presence of anti-GBM antibodies.
**Option B:** This statement is also true, as the disease is characterized by RPGN and pulmonary hemorrhage.
**Option C:** This statement is incorrect because Goodpasture's syndrome is not typically associated with the presence of ANA (antinuclear antibodies) or other autoimmune markers commonly seen in lupus or rheumatoid arthritis.
**Clinical Pearl / High-Yield Fact**
Goodpasture's syndrome is a classic example of a type II hypersensitivity reaction, mediated by antibodies that bind to an antigen on the surface of host cells, leading to complement activation and tissue damage.
**Correct Answer:**
(D)