title: High prevalence of Mycobacterium avium subspecies paratuberculosis IS900 DNA in gut tissues from individuals with Crohn's disease.
abstract: OBJECTIVE
  Conflicting results exist about the presence of Mycobacterium avium subspecies paratuberculosis (MAP) specific IS900 DNA in Crohn's disease (CD) tissues. Therefore, we examined IS900 in a large number of gut samples from patients with CD (n = 100) and ulcerative colitis (UC, n = 100), and in non-inflamed control tissues (nIBD, n = 100). We hypothesised that IS900 DNA detection might be associated with distinct clinical phenotypic characteristics in CD.
  
  
  METHODS
  The prevalence of MAP DNA in surgically resected tissues was examined using a mechanical-enzymatic disruption technique and nested IS900 specific polymerase chain reaction (PCR). CD patients were stratified according to the criteria of the Vienna classification and other clinical characteristics.
  
  
  RESULTS
  IS900 PCR detection rate was significantly higher in CD tissue samples (52%) than in UC (2%) or nIBD (5%) specimens (p<0.0001). In CD patients, IS900 DNA was detected in samples from both diseased small bowel (47%) as well as from the colon (61%). No firm association between MAP specific IS900 detection rates and clinical phenotypic characteristics in CD could be established. However, corticosteroid medication constituted a factor which tended to have a negative influence on IS900 DNA detection rates in CD (p<0.01).
  
  
  CONCLUSIONS
  The presence of MAP specific IS900 DNA is a predominant feature of CD. Therapeutic intervention against MAP might represent a potential target for disease mitigation in Crohn's disease.
authors.affiliation: Institute of Pathology, University of Heidelberg, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Autschbach
authors.forename: S
authors.initials: S
authors.lastname: Eisold
authors.forename: U
authors.initials: U
authors.lastname: Hinz
authors.forename: S
authors.initials: S
authors.lastname: Zinser
authors.forename: M
authors.initials: M
authors.lastname: Linnebacher
authors.forename: T
authors.initials: T
authors.lastname: Giese
authors.forename: T
authors.initials: T
authors.lastname: Löffler
authors.forename: M W
authors.initials: MW
authors.lastname: Büchler
authors.forename: J
authors.initials: J
authors.lastname: Schmidt
mesh_terms: D000328:Adult; D000368:Aged; D003093:Colitis, Ulcerative / Q000382:microbiology; D003424:Crohn Disease / Q000382:microbiology*; D004269:DNA, Bacterial / Q000032:analysis; D005260:Female; D006801:Humans; D007422:Intestines / Q000382:microbiology; D008297:Male; D008875:Middle Aged; D016927:Mycobacterium avium subsp. paratuberculosis / Q000302:isolation & purification; D010283:Paratuberculosis / Q000150:complications*; D016133:Polymerase Chain Reaction / Q000379:methods
chemical_list: D004269:DNA, Bacterial