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Immuno-phenotypic and functional characterization of rabbit pulmonary intravascular macrophages

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Abstract

Pulmonary intravascular macrophages (PIMs) are present in species such as cattle, sheep and horse and promote acute lung inflammation (ALI). Rabbits are often used as a model of ALI but there is controversy about the presence of PIMs in these species. Rabbits were treated with 10 mg/kg of gadolinium chloride intravenously (GC; n = 6) or saline (n = 6) followed by euthanasia at 48 h post-treatment to determine the presence of PIMs. In a subsequent study, rabbits were pre-treated with GC or 0.9 % saline followed by 100 μg/kg of E. coli lipopolysaccharide intravenously 48 h later. Rabbits were euthanized 24 h post-LPS treatment. Light and electron microscopy showed that PIMs attached to the capillary endothelium and were positive for RAM-11 anti-macrophage antibody. While GC treatment induced apoptotic PIMs, there was no difference in the PIM number between control and GC-treated rabbits. Rabbits administered with LPS were 3.5 times more likely to die before the end of the 24-h period than those pre-treated with GC. Lung heterophil accumulation and IL-1β, TNFα and IL-6 mRNA expression were significantly higher in rabbits administered with LPS compared to those administered with GC before the LPS injection. PIMs from the LPS-treated rabbits were positive for TNFα. Lung, BAL and serum IL-8 and MCP-1 expression was not different between LPS rabbits with or without pre-treatment with GC. We conclude that rabbit lungs contain PIMs and that their depletion reduces endotoxin-induced lung inflammation. The presence of PIMs in rabbit lungs may need to be considered while using rabbit to model acute lung injury.

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Acknowledgements

The research was supported through a grant to Dr. Duke-Novakovski and Dr. Singh from the Equine Health Research Fund of the Western College of Veterinary Medicine and a grant from the Natural Science and Engineering Research Council of Canada to Dr. Baljit Singh.

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Correspondence to Baljit Singh.

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Duke-Novakovski, T., Singh-Suri, S., Kajikawa, O. et al. Immuno-phenotypic and functional characterization of rabbit pulmonary intravascular macrophages. Cell Tissue Res 351, 149–160 (2013). https://doi.org/10.1007/s00441-012-1509-2

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