title: Increased colonic ornithine decarboxylase activity in inflammatory bowel disease in children.
abstract: The risk of colorectal carcinoma is increased in pediatric-onset inflammatory bowel disease (IBD). There is little information available regarding the colonic mucosal proliferative state in children with IBD. The aim of this study was to assess colonic ornithine decarboxylase (ODC) activity, a marker of cell proliferation, in pediatric IBD patients. ODC activity was assessed in colonic mucosa from 23 children (7 with ulcerative colitis, 9 with Crohn's disease, and 7 controls) undergoing colonoscopic examination. ODC activities were then compared with degree of inflammation of biopsied samples. ODC activities in patients with and without corticosteroid treatment were also analyzed. The mucosal ODC activities of sigmoid colon and rectum were significantly higher (2.5- to 4-fold) in both ulcerative colitis and Crohn's disease. The higher ODC activity was associated with increased mucosal inflammation. Moreover, treatment with corticosteroids decreased the ODC activity. In conclusion, using ODC activities as a marker of cell proliferation, our results suggest that there is a higher colonic mucosal proliferative state in children with IBD. The increased ODC activities were associated with increased colonic mucosal inflammation. Colonic mucosal ODC activity may provide an additional parameter to access the therapeutic efficacy of corticosteroid treatment in pediatric IBD patients.
authors.affiliation: Department of Pediatrics, Wayne State University School of Medicine; and Children's Hospital of Michigan, Detroit 48201, USA.
authors.forename: R B
authors.initials: RB
authors.lastname: Pillai
authors.forename: V
authors.initials: V
authors.lastname: Tolia
authors.forename: R
authors.initials: R
authors.lastname: Rabah
authors.forename: P M
authors.initials: PM
authors.lastname: Simpson
authors.forename: R
authors.initials: R
authors.lastname: Vijesurier
authors.forename: C H
authors.initials: CH
authors.lastname: Lin
mesh_terms: D000293:Adolescent; D000305:Adrenal Cortex Hormones / Q000627:therapeutic use; D002648:Child; D002675:Child, Preschool; D003093:Colitis, Ulcerative / Q000188:drug therapy / Q000201:enzymology* / Q000473:pathology; D003106:Colon / Q000201:enzymology*; D003424:Crohn Disease / Q000188:drug therapy / Q000201:enzymology* / Q000473:pathology; D005260:Female; D006801:Humans; D007413:Intestinal Mucosa / Q000201:enzymology / Q000473:pathology; D008297:Male; D008940:Mitotic Index; D009955:Ornithine Decarboxylase / Q000378:metabolism*; D011446:Prospective Studies; D012016:Reference Values
chemical_list: D000305:Adrenal Cortex Hormones; D009955:Ornithine Decarboxylase