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Background  Impaired intestinal epithelial barrier is highly affected in inflammatory bowel disease. Transmembrane collagens connecting the epithelial cells to the extracellular matrix have an important role in epithelial cell homeostasis. Thus, we sought to determine whether the transmembrane type 23 collagen could serve as a surrogate marker for disease activity in patients with Crohn's disease and ulcerative colitis.    Methods  We developed an enzyme‐linked immunosorbent assay to detect the ectodomain of type 23 collagen (PRO‐C23) in serum, followed by evaluation of its levels in both acute and chronic dextran sulphate sodium colitis models in rats and human inflammatory bowel disease cohorts. Serum from 44 Crohn's disease and 29 ulcerative colitis patients with active and inactive disease was included.    Results  In the acute and chronic dextran sulphate sodium‐induced rat colitis model, the PRO‐C23 serum levels were significantly increased after colitis and returned to normal levels after disease remission. Serum levels of PRO‐C23 were elevated in Crohn's disease ( p  < 0.05) and ulcerative colitis ( p  < 0.001) patients with active disease compared to healthy donors. PRO‐C23 differentiated healthy donors from ulcerative colitis (area under the curve [AUC]: 0.81,  p  = 0.0009) and Crohn's disease (AUC: 0.70,  p  = 0.0124). PRO‐C23 differentiated ulcerative colitis patients with active disease from those in remission (AUC: 0.75,  p  = 0.0219) and Crohn's disease patients with active disease from those in remission (AUC: 0.68,  p  = 0.05).    Conclusion  PRO‐C23 was elevated in rats with active colitis, and inflammatory bowel disease patients with active disease. Therefore, PRO‐C23 may be used as a surrogate marker for monitoring disease activity in ulcerative colitis and Crohn's disease.

united european gastroenterology journal

Elevated ectodomain of type 23 collagen is a novel biomarker of the intestinal epithelium to monitor disease activity in ulcerative colitis and Crohn's disease