?:definition
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The presence of autoantibodies in the blood circulation that react against bactericidal/permeability-increasing protein (BPI). BPI is an endotoxin-binding host protein with important antibacterial effects against Gram-negative bacteria, such as Pseudomonas aeruginosa. nBPI is a 55 kDalton protein that is most abundant in the azurophilic granules of neutrophils. BPI also acts as a target antigen for antineutrophil cytoplasmic autoantibodies. [ORCID:0000-0002-4095-8489, PMID:31508255]
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