title: Transcriptional immune response in mesenteric lymph nodes in pigs with different levels of resistance to Ascaris suum.
abstract: A single nucleotide polymorphism on chromosome 4 (SNP TXNIP) has been reported to be associated with roundworm (Ascaris suum) burden in pigs. The objective of the present study was to analyse the immune response to A. suum mounted by pigs with genotype AA (n = 24) and AB (n = 23) at the TXNIP locus. The pigs were repeatedly infected with A. suum from eight weeks of age until necropsy eight weeks later. An uninfected control group (AA; n = 5 and AB; n = 5) was also included. At post mortem, we collected mesenteric lymph nodes and measured the expression of 28 selected immune-related genes. Recordings of worm burdens confirmed our previous results that pigs of the AA genotype were more resistant to infection than AB pigs. We estimated the genotype difference in relative expression levels in infected and uninfected animals. No significant change in expression levels between the two genotypes due to infection was observed for any of the genes, although IL-13 approached significance (P = 0.08; Punadjusted = 0.003). Furthermore, statistical analysis testing for the effect of infection separately in each genotype showed significant up-regulation of IL-13 (P<0.05) and CCL17 (P<0.05) following A. suum infection in the 'resistant' AA genotype and not in the 'susceptible' AB genotype. Pigs of genotype AB had higher expression of the high-affinity IgG receptor (FCGR1A) than AA pigs in both infected and non-infected animals (P = 1.85*10-11).
authors.forename: Per
authors.initials: P
authors.lastname: Skallerup
authors.forename: Peter
authors.initials: P
authors.lastname: Nejsum
authors.forename: Susanna
authors.initials: S
authors.lastname: Cirera
authors.forename: Kerstin
authors.initials: K
authors.lastname: Skovgaard
authors.forename: Christian B
authors.initials: CB
authors.lastname: Pipper
authors.forename: Merete
authors.initials: M
authors.lastname: Fredholm
authors.forename: Claus B
authors.initials: CB
authors.lastname: Jørgensen
authors.forename: Stig M
authors.initials: SM
authors.lastname: Thamsborg
mesh_terms: D000818:Animals; D001196:Ascariasis / Q000235:genetics / Q000276:immunology / Q000662:veterinary*; D017165:Ascaris suum; D005243:Feces / Q000469:parasitology; D020022:Genetic Predisposition to Disease; D005838:Genotype; D008198:Lymph Nodes / Q000378:metabolism*; D010270:Parasite Egg Count; D020641:Polymorphism, Single Nucleotide; D013552:Swine; D013553:Swine Diseases / Q000235:genetics / Q000276:immunology / Q000469:parasitology*