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Background and Objective . Using Collagen IV staining, we have previously reported that the reticular basement membrane (Rbm) is hypervascular and the lamina propria (LP) is hypovascular in COPD airways. This study compared Collagen IV staining with vessels marked with anti-Factor VIII and examined vessel permeability in bronchial biopsies from COPD and normal subjects using albumin staining.  Results . Anti-Collagen IV antibody detected more vessels in the Rbm ( P  = 0.002) and larger vessels in both Rbm ( P  < 0.001) and LP ( P  = 0.003) compared to Factor VIII. COPD airways had more vessels (with greater permeability) in the Rbm ( P  = 0.01) and fewer vessels (with normal permeability) in the LP compared to controls with both Collagen IV and Factor VIII antibodies ( P  = 0.04 and  P  = 0.01).  Conclusion . Rbm vessels were increased in number and were hyperpermeable in COPD airways. Anti-Collagen IV and anti-Factor VIII antibodies did not uniformly detect the same vessel populations; the first is likely to reflect larger and older vessels with the latter reflecting smaller, younger vessels.

Reticular Basement Membrane Vessels Are Increased in COPD Bronchial Mucosa by Both Factor VIII and Collagen IV Immunostaining and Are Hyperpermeable