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Type of publication: Journal Article
Type of document: Full Paper

Year: 2014

Authors: Mann, E; Dzieciol, M; Metzler-Zebeli, BU; Wagner, M; Schmitz-Esser, S

Title: Microbiomes of unreactive and pathologically altered ileocecal lymph nodes of slaughter pigs.

Source: Appl Environ Microbiol. 2014; 80(1):193-203

Authors Vetmeduni Vienna:

Dzieciol Monika
Metzler-Zebeli Barbara
Schmitz-Esser Stephan
Selberherr Evelyne
Wagner Martin

Vetmed Research Units
Institute of Food Safety, Food Technology and Veterinary Public Health, Unit of Food Microbiology
University Clinic for Swine

Project(s): Preventive Veterinary Medicine

Microbe-laden dendritic cells are shifted to ileocecal lymph nodes (ICLNs), where microbes are concentrated and an adequate immune response is triggered. Hence, ICLNs are at a crucial position in immune anatomy and control processes of the local immune system. Pathological alterations in ICLNs, such as reactive hyperplasia, lymphadenitis purulenta, or granulomatosa, can harbor a multitude of pathogens and commensals, posing a potential zoonotic risk in animal production. The aim of this study was to characterize the microbial diversity of unreactive ICLNs of slaughter pigs and to investigate community shifts in reactive ICLNs altered by enlargement, purulence, or granulomatous formations. Pyrosequencing of 16S rRNA gene amplicons from 32 ICLNs yielded 175,313 sequences, clustering into 650 operational taxonomic units (OTUs). OTUs were assigned to 239 genera and 11 phyla. Besides a highly diverse bacterial community in ICLNs, we observed significant shifts in pathologically altered ICLNs. The relative abundances of Cloacibacterium- and Novosphingobium-associated OTUs and the genus Faecalibacterium were significantly higher in unreactive ICLNs than in pathologically altered ICLNs. Enlarged ICLNs harbored significantly more Lactobacillus- and Clostridium-associated sequences. Relative abundances of Mycoplasma, Bacteroides, Veillonella, and Variovorax OTUs were significantly increased in granulomatous ICLNs, whereas abundances of Pseudomonas, Escherichia, and Acinetobacter OTUs were significantly increased in purulent ICLNs (P < 0.05). Correlation-based networks revealed interactions among OTUs in all ICLN groups, and discriminant analyses depicted discrimination in response to pathological alterations. This study is the first community-based survey in ICLNs of livestock animals and will provide a basis to broaden the knowledge of microbe-host interactions in pigs.

Keywords Pubmed: Animals
DNA, Bacterial/chemistry
DNA, Bacterial/genetics
DNA, Ribosomal/chemistry
DNA, Ribosomal/genetics
Lymph Nodes/microbiology*
Molecular Sequence Data
RNA, Ribosomal, 16S/genetics
Sequence Analysis, DNA

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