| First Author | Bouma G | Year | 2002 |
| Journal | Gastroenterology | Volume | 123 |
| Issue | 2 | Pages | 554-65 |
| PubMed ID | 12145808 | Mgi Jnum | J:82095 |
| Mgi Id | MGI:2450880 | Doi | 10.1053/gast.2002.34752 |
| Citation | Bouma G, et al. (2002) Experimental murine colitis is regulated by two genetic loci, including one on chromosome 11 that regulates IL-12 responses. Gastroenterology 123(2):554-65 |
| abstractText | BACKGROUND & AIMS: Immunogenetic analysis of experimental colitis may contribute to the further unraveling of the complex genetic basis of the inflammatory bowel diseases, Crohn's disease and ulcerative colitis. METHODS: Genetic regions associated with susceptibility to trinitrobenzene sulfonic acid (TNBS)-induced colitis were identified in a genome-wide linkage analysis in F2 progeny of colitis-susceptible SJL/J and -resistant C57BL/6 mice. An immunogenetic approach was then used to further study the pathophysiologic role of one of the identified loci. RESULTS: We identified susceptibility loci on chromosomes 9 (Tnbs1) and 11 (Tnbs2). Tnbs2 harbors the interleukin (IL)-12 p40 gene, a likely candidate gene because IL-12 is a known central mediator for both experimental colitis and human Crohn's disease. We therefore tested the ability of colitis-susceptible and -resistant strains to mount IL-12 responses to lipopolysaccharide (LPS), a strong inducer of IL-12 that is abundantly present in the intestine. We observed a remarkably higher serum IL-12 response to LPS in susceptible SJL/J mice. Subsequently, we showed that the genetic region regulating the IL-12 response to LPS colocalizes with Tnbs2. CONCLUSIONS: These data strongly suggest that the tendency to mount a high LPS-induced IL-12 response and susceptibility to TNBS-induced colitis are related and that in fact a genetically determined high IL-12 response is involved in the immunologic basis of susceptibility to colitis. |
