One-week dextran sulfate treatment of conventional (CV) immunodeficient (SCID) mice gave rise to acute colitis in the colon mucosa; germ-free (GF) SCID mice did not exhibit any changes in colon morphology. Dextran sulfate application to CV immunocompetent (BALB/c) mice did induce substantial changes in the colon mucosa (grade 4); GF BALB/c mice showed mild changes in the colon morphology (grade 1) only. GF SCID mice and CV SCID mice died during the second round of dextran sulfate treatment suffering from chronic colitis; GF BALB/c mice exhibited mild crypt distortion while CV BALB/c mice showed a complete loss of the surface epithelium (grade 4), accompanied by T and B lymphocyte infiltration.

Department of Immunology and Gnotobiology Institute of Microbiology Academy of Sciences of the Czech Republic 549 22 Nový Hrádek Czechia

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