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Legastelois, I. et al.

Alveolar macrophages from sheep naturally infected by visna-maedi virus contribute to IL-8 production in the lung.

Sheep naturally infected by visna-maedi virus often develop a chronic interstitial lung disease characterized by an alveolitis comprising lymphocytes, neutrophils and macrophages. The alpha chemokine interleukin-8 (IL-8) was detected in cell free bronchoalveolar lavage fluid from naturally infected animals, confirmed by RT-PCR, presenting typical lesions of maedi and elevated total alveolar cell counts. No detectable IL-8 was found in the fluid obtained from uninfected animals. IL-8 concentration in alveolar fluid is correlated with alveolar neutrophil counts. Bronchoalveolar lavage cells from infected animals were found to contain a large amount of IL-8 mRNA and may contribute to IL-8 production. In situ hybridization showed that macrophages were the predominant cell type expressing IL-8 mRNA. Sustained production of IL-8 by alveolar macrophages during visna-maedi infection could suffice for neutrophil attraction to the alveoli, and may contribute to the development of lesions.[1]

References

Alveolar macrophages from sheep naturally infected by visna-maedi virus contribute to IL-8 production in the lung. Legastelois, I., Cottin, V., Mornex, J.F., Cordier, G. Vet. Immunol. Immunopathol. (1997) [Pubmed]

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