Pattern-recognition receptor mRNA expression and function in canine monocyte/macrophages and relevance to canine anal furunuclosis

House, A K; Gregory, S P; Catchpole, B

Abstract

Pattern-recognition receptors (PRRs) are important components of the innate immune system, enabling early detection of infection. Defective PRR function has been implicated in several infectious and immune-mediated diseases of human beings. including Crohn's disease (CD). Anal furunculosis (AF) is an immune-mediated disease which primarily occurs in German shepherd dogs (GSD) and could result from a similar type of PRR dysfunction. The aim of the current study was to investigate canine PRR responses in vitro and to test the hypothesis that these were altered in AF-affected GSD. The pattern-recognition receptors TLR1, TLR2, TLR4, TLR6, TLR9, NOD1 (nucleotide-binding oligomerisation domain) and NOD2 were evaluated in the DH82 canine monocyte/macrophage cell line. These cells were found to express mRNA for all the selected PRRs with TLR2 mRNA the most and TLR5 mRNA the least abundant. A similar pattern of expression was found in canine blood-derived monocyte/macrophages. Stimulation of DH82 cells and blood-derived monocyte/macrophages using specific PRR-ligands, resulted in expression of pro-inflammatory cytokine mRNA. Quantification of TNF alpha mRNA and protein secretion from Stimulated cells demonstrated variable responses with lipopolysaccharide (TLR4 ligand) and PAM(3)CSK4 (TLR 1/2 ligand) proving to be the most potent and CpG DNA (TLR9 ligand) the least potent. Comparing PRR responses in blood-derived monocyte/macrophages from healthy blood-donor dogs with those from AF-affected GSD showed a deficiency in the latter in response to LD-MDP (NOD2 ligand) at the mRNA level but not at the protein level. It is possible that dysfunctional NOD2 responses by cells of the monocyte/macrophage lineage are involved in the pathogenesis of AF (C) 2008 Elsevier B.V. All rights reserved.

Citation

House, A. K., Gregory, S. P., & Catchpole, B. Pattern-recognition receptor mRNA expression and function in canine monocyte/macrophages and relevance to canine anal furunuclosis. Veterinary Immunology and Immunopathology, 124(3-4), 230-240. https://doi.org/10.1016/j.vetimm.2008.03.012

• Journal Article Type: Article
• Deposit Date: Nov 12, 2014
• Journal: VETERINARY IMMUNOLOGY AND IMMUNOPATHOLOGY
• Print ISSN: 0165-2427
• Publisher: Elsevier
• Volume: 124
• Issue: 3-4
• Pages: 230-240
• DOI: https://doi.org/10.1016/j.vetimm.2008.03.012
• Public URL: https://rvc-repository.worktribe.com/output/1429696