Document Detail

Erysipelothrix rhusiopathiae exploits cytokeratin 18-positive epithelial cells of porcine tonsillar crypts as an invasion gateway.
MedLine Citation:
PMID:  23601839     Owner:  NLM     Status:  Publisher    
Tonsils are important organs for mucosal immunity and are gateways for various pathogens, including bacteria and viruses. The purpose of the present study was to reveal how Erysipelothrix rhusiopathiae, the causative agent of swine erysipelas, invades the mucosal epithelium of the tonsils of pigs. Two germ-free piglets were orally infected with E. rhusiopathiae Koganei 65-0.15, an attenuated vaccine strain in Japan, and their tonsils of the soft palate were histologically examined four weeks after infection. Bacterial organisms were observed in dilated crypt lumens and a few epithelial cells of the crypt. Immunohistochemical examination revealed that some epithelial cells of the crypt were positive for cytokeratin (CK) 18, a specific marker for M cells in the Peyer's patches of pigs. Confocal laser scanning microscopy showed that bacterial antigens were present in the cytoplasm of CK 18-positive epithelial cells. Furthermore, an ultramicroscopic examination revealed that the bacteria-containing epithelial cells did not have microfolds or microvilli, both of which are characteristic of membranous epithelial cells (M cells), and that they were in close contact with intraepithelial phagocytes. Thus, the present observations suggest that the tonsillar crypt epithelium is a site of persistent infection for orally administered E. rhusiopathiae, and the bacteria exploit cytokeratin 18-positive epithelial cells of the crypts as portals of entry into the body.
Tomoyuki Harada; Yohsuke Ogawa; Masahiro Eguchi; Fang Shi; Masumi Sato; Kazuyuki Uchida; Hiroyuki Nakayama; Yoshihiro Shimoji
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-3-30
Journal Detail:
Title:  Veterinary immunology and immunopathology     Volume:  -     ISSN:  1873-2534     ISO Abbreviation:  Vet. Immunol. Immunopathol.     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-4-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8002006     Medline TA:  Vet Immunol Immunopathol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Elsevier B.V. All rights reserved.
National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan; Department of Veterinary Pathology, Graduate School of Agricultural and Life Science, The University of Tokyo, Tokyo, Japan.
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