Hypersensitivity Reactions · Pathology

Which of the following describes the mechanism of Goodpasture syndrome?

  1. IgE-mediated mast cell degranulation in the basement membrane
  2. Anti-GBM antibodies against alpha-3 chain of Type IV collagen
  3. Circulating immune complexes depositing in glomerular capillaries
  4. Cytotoxic T-cells destroying alveolar septa
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Correct answer: Anti-GBM antibodies against alpha-3 chain of Type IV collagen

Goodpasture syndrome is a Type II hypersensitivity where autoantibodies target fixed antigens in the glomerular and alveolar basement membranes. Immunofluorescence shows a characteristic smooth, linear pattern of IgG deposition.

Difficulty: Medium Question 6 of 20

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