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J Clin Microbiol. 1986 September; 24(3): 357-363

Spheroplastic phase of mycobacteria isolated from patients with Crohn's disease.

ABSTRACT

Two strains of an unclassified Mycobacterium species were isolated after 18 and 30 months of incubation of media inoculated with resected intestinal tissues from patients with Crohn's disease. These strains represented the third and fourth isolates of this organism from Crohn's disease patients. Ultrastructural examination of this strain and two previously isolated strains revealed the presence of spheroplasts which eventually transformed into the bacillary form of a previously unrecognized Mycobacterium species. These cell wall-deficient forms did not stain with conventional dyes and failed to grow on hypertonic media. Restriction polymorphism of the ribosomal DNA genes was used to determine the relationship between the cell wall-deficient and bacillary forms. Identical restriction patterns of the ribosomal DNA genes were found between the spheroplasts and Mycobacterium sp. isolates with EcoRI, BamHI, and XhoI restriction endonucleases, thus providing definitive evidence of their origin. Unidentified spheroplasts were isolated from an additional 12 patients with Crohn's disease, of which 7 of 10 seroagglutinated with antiserum prepared against the Mycobacterium sp. Spheroplasts were isolated from 16 of 26 (61%) patients with Crohn's disease but not from tissues of 13 patients with ulcerative colitis or 13 patients with other diseases of the bowel. These findings support the role of mycobacteria as etiologic agents in some cases of Crohn's disease.

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