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. 1979 Oct;97(1):85–92.

Immune Complex Injury of the Lung

Peter A Ward
PMCID: PMC2042385  PMID: 158982

Abstract

Abundant evidence currently exists to suggest that immune complexes play an important role in inflammatory diseases of the lung. Clinically, idiopathic pulmonary fibrosis, eosinophilic granuloma of lung, and systemic lupus erythematosus have been shown to be associated with the presence of immune complexes both in lung and in the serum. Experimentally, there is compelling evidence that acute lung injury can be triggered by the deposition of complexes in vascular walls or by the presence of performed immune complexes instilled into the airways. The observed reactions are, as expected, complement- and neutrophil-dependent. The morphologic changes in lung caused by products of complement activation (C5a and related peptides) depend on whether complement activation occurs within the vasculature or within the airways. Airway activation is associated with intraalveolar accumulations of neutrophils, while intravascular activation leads to intracapillary sequestration of neutrophils. The chronic formation of immune complexes within the vasculature (in the model of “chronic serum sickness”) leads to an interstitial fibrotic reaction and a thickening of basement membranes. Recent studies of intravascularly infused preformed immune complexes indicate a proclivity for certain types of complexes to localize within lung. These “lung-seeking” complexes differ from non-lung-seeking complexes only in the ratio of antigen to antibody. Complement does not seem to alter the tendancy for certain complexes to localize within lung. These studies emphasize the potential importance of immune complexes in lung injury and point out the variety of mechanisms involved in both the localization process and the injury process.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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