The cytokine response of circulating peripheral blood mononuclear cells is changed after intravenous injection of lipopolysaccharide in cattle
Jacobsen, S.; Andersen, P. H.; Aasted, B.
The aim of the study was to investigate lipopolysaccharide (LPS)-induced short and long term changes in capacity for intracellular cytokine-production of bovine circulating peripheral blood mononuclear cells (PBMCs). Eight dairy cows each received three intravenous injections of Escherichia coli LPS (10, 100 and 1000 ng/kg, consecutively) at 3 week intervals. Intracellular cytokine production was determined by flow cytometry in PBMCs obtained 0, 2, 6 and 24 h after each LPS challenge. After LPS administration, proportions of monocytes producing tumour necrosis factor (TNF) alpha, interleukin (IL)-1 beta and IL-8, as well as proportions of circulating lymphocytes producing interferon (IFN) gamma, decreased significantly. Within 24 h, proportions had returned to or increased above pre-injection levels. Proportions of lymphocytes producing IL-4 and IL-10 increased significantly after injection of 1000 ng LPS/kg.This study demonstrated that cytokine profiles shift quickly, but temporarily, to favour the anti-inflammatory response immediately after LPS exposure. The long term response to LPS was opposite to the immediate response, as cytokine profiles shifted in the 3 weeks between challenges towards a pro-inflammatory response. Proportions of monocytes producing IL-l beta and TNF alpha determined immediately before the second and/or third LPS injection were higher than proportions determined before the first injection, whereas pre-injection proportions of lymphocytes producing IL-4 decreased with each challenge. These changes may result in a quicker host response to invading pathogens. (c) 2006 Elsevier Ltd. All rights reserved.
intracellular staining; cytokine; bovine; lipopolysaccharide; inflammatory-stimulus-induced anergy
2007, Volume: 174, number: 1, pages: 170-175
Publisher: ELSEVIER SCI LTD
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