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Clinical and Diagnostic Laboratory Immunology, Nov 1997, 769-773, Vol 4, No. 6
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Interleukin-1 receptor mRNA expression in activated bovine leukocytes in vitro

PW Yu, LA Schuler and CJ Czuprynski
Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, 53706, USA.

Interleukin-1 (IL-1) is a key player in inflammation and the immune response. To better understand the complex interactions of IL-1 and its receptors in inflammation, we need to investigate how type I and type II IL-1 receptors (IL-1RI and IL-1RII) are regulated by cytokines and other mediators. Using semiquantitative reverse transcriptase PCR and Northern analysis, we examined the regulation of IL-1RI and IL-1RII mRNA levels in bovine polymorphonuclear leukocytes (PMNs) (i.e., neutrophils) and peripheral blood mononuclear cells (PBMCs) in vitro. IL-1RI mRNA levels were up-regulated in PBMCs by recombinant bovine IL- 1beta (rBoIL-1beta), recombinant bovine granulocyte-macrophage colony- stimulating factor (rBoGM-CSF), rBoIL-4, recombinant bovine gamma interferon (rBoIFN-gamma), and dexamethasone. IL-1RI mRNA was increased in bovine PMNs exposed to rBoGM-CSF, rBoIL-4, and dexamethasone but was down-regulated by rBoIL-1beta and rBoIFN-gamma. IL-1RII mRNA was increased in bovine PBMCs and PMNs after exposure to rBoIL-1beta, rBoGM- CSF, rBoIL-4, and dexamethasone. In contrast, rBoIFN-gamma down- regulated the expression of bovine IL-1RII mRNA in PBMCs. These findings suggest that the expression of bovine IL-1RI and IL-1RII mRNAs is regulated differently by certain soluble stimuli (e.g., IFN-gamma) in PMNs and PBMCs.

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