Differences in pig respiratory tract and peripheral blood immune responses to Actinobacillus pleuropneumoniae.

Veterinary Microbiology
Chuntong BaoLiancheng Lei

Abstract

Excessive cytokine production is an important component of the acute respiratory distress syndrome and multiple organ failure. Pneumonia can lead to an overexpression of cytokines, although comparatively little is known about the relevance and differences in cytokines between blood and lung. In this study, piglets were experimentally infected intranasally with Actinobacillus pleuropneumoniae (APP), and transcriptomes of lung tissue and peripheral blood mononuclear cells determined. In addition, the levels of 30 cytokines in broncheoalveolar lavage fluid (BALF) and sera were determined by ELISA. Post infection, there was an early increase in lung monocytes, and a later rise in inflammatory cytokines in BALF. Blood lymphocytes increased early in infection and there was a rise in inflammatory cytokines in the peripheral blood of infected piglets. Genes involved in cytokine production, leukocyte migration and differentiation, lymphocyte activation, and cytokine-mediated signaling pathways in the transcriptomes of lung tissue were significantly down-regulated early in infection. At this early phase of APP infection (0-6 h), the cytokines IL-1β, MCP-1, and IL-5 in sera increased rapidly and significantly, while many cytokines in BALF...Continue Reading

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