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Pathogenesis of Vascular Inflammation by Anti-Neutrophil Cytoplasmic Antibodies

Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina

Address correspondence to: Dr. J. Charles Jennette, Department of Pathology and Laboratory Medicine, 303 Brinkhous-Bullitt Building, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7525. Phone: 919-966-4676; Fax: 919-966-4542; E-mail: jcj{at}med.unc.edu

The reports of a newborn who developed glomerulonephritis and pulmonary hemorrhage after transplacental transfer of anti-neutrophil cytoplasmic antibody (ANCA) IgG with specificity for myeloperoxidase (MPO) is compelling clinical evidence that ANCA are pathogenic. In vitro studies indicate that ANCA activate cytokine-primed neutrophils and monocytes through both direct Fab'2 binding and Fc receptor engagement. Neutrophils that have been activated by ANCA release oxygen radicals, lytic enzymes, and inflammatory cytokines and adhere to and kill endothelial cells. A murine model caused by passive administration of mouse anti-mouse MPO IgG provides convincing evidence that ANCA IgG alone in the absence of antigen-specific T cells can cause necrotizing glomerulonephritis and vasculitis. This pathogenic process is enhanced by synergistic inflammatory factors, probably through priming of neutrophils. Immunization of rats with human MPO induces antibodies that cross-react with rat MPO and cause glomerulonephritis and vasculitis. These ANCA act in concert with chemokines to cause adherence of leukocytes to the walls of small vessels with subsequent injury. To date, animal models of disease that is induced by anti-proteinase 3 are less robust. Clinical and experimental data suggest but do not prove that the ANCA autoimmune response is initiated by an immune response to an antisense peptide of the ANCA antigen or its mimic that may be introduced into the body by an infectious pathogen. This antibody response elicits anti-idiotypic antibodies that cross-react with ANCA antigens. The pathogenesis of ANCA disease is multifactorial, with genetic and environmental factors influencing onset of the autoimmune response, the mediation of acute injury, and the induction of the chronic response to injury.

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