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. 1997 Dec 15;100(12):2984–2994. doi: 10.1172/JCI119852

Role of nitric oxide in experimental obliterative bronchiolitis (chronic rejection) in the rat.

E A Kallio 1, P K Koskinen 1, E Aavik 1, K Vaali 1, K B Lemstöm 1
PMCID: PMC508510  PMID: 9399944

Abstract

The role of nitric oxide in obliterative bronchiolitis development, i.e., chronic rejection, was investigated in the heterotopic rat tracheal allograft model. An increase in the intragraft inducible nitric oxide synthase (iNOS) mRNA and mononuclear inflammatory cell iNOS immunoreactivity was demonstrated during progressive loss of respiratory epithelium and airway occlusion in nontreated allografts compared to syngeneic grafts. In nontreated allografts, however, intragraft nitric oxide production was decreased, most likely because of loss of iNOS epithelial expression. Treatment with aminoguanidine, a preferential inhibitor of inducible nitric oxide synthase, was associated with enhanced proliferation of alpha-smooth muscle actin immunoreactive cells and the intensity of obliterative bronchiolitis early after transplantation. Aminoguanidine treatment did not affect iNOS mRNA synthesis or intragraft nitric oxide production, but decreased iNOS immunoreactivity in smooth muscle cells. Treatment with L-arginine, a precursor of nitric oxide, significantly reduced obliterative changes. L-arginine supplementation enhanced intragraft iNOS mRNA synthesis and iNOS immunoreactivity in capillary endothelial and smooth muscle cells as well as intragraft nitric oxide production. Immunohistochemical analysis of allografts showed that neither iNOS inhibition nor supplementation of the nitric oxide pathway affected the number of graft-infiltrating CD4+ and CD8+ T cells, ED1+ and ED3+ macrophages, immune activation with expression of IL-2R or MHC class II, or production of macrophage or Th1 cytokines. In contrast, L-arginine treatment was associated with increased staining for Th2 cytokines IL-4 and IL-10. In conclusion, this study demonstrates that nitric oxide has a protective role in obliterative bronchiolitis development in this model, and suggests that nitric oxide either directly or indirectly inhibits smooth muscle cell proliferation and modulates immune response towards Th2 cytokines.

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Selected References

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