Analysis of Periostin, TGF-β, and SLUG Expression in Inflammatory Bowel Disease in Pediatric Patients and Their Clinical Implications

<b>Background:</b> Pediatric inflammatory bowel disease (pIBD), including Crohn's disease (CD) and ulcerative colitis (UC), is characterized by chronic intestinal inflammation and fibrosis. Identifying molecular mediators involved in inflammation and tissue repair is critical for improving disease management. <b>Objective:</b> To examine the expression of periostin, TGF-β, and SLUG in pIBD and assess their potential roles in intestinal inflammation, fibrosis, and mucosal healing. <b>Methods:</b> Intestinal biopsies from 33 pediatric patients (11 CD, 22 UC) and 10 healthy controls were analyzed immunohistochemically. Quantitative PCR evaluated <i>POSTN</i>, <i>TGF-β1</i>, and <i>SNAI2</i> expression in 22 patients and 6 controls. Correlations with fecal calprotectin, the Pediatric Crohn's Disease Activity Index (PCDAI), and the Pediatric Ulcerative Colitis Activity Index (PUCAI) were determined. <b>Results:</b> Periostin, TGF-β, and SLUG expression were significantly increased in pIBD compared with controls. Periostin levels were higher in CD than in UC. All markers correlated positively at mRNA and protein levels. Notably, periostin showed an inverse correlation with fecal calprotectin and PCDAI scores. <b>Conclusions:</b> Periostin, TGF-β, and SLUG may represent biomarkers of pIBD activity. Periostin appears to mediate inflammation and promote mucosal fibrosis or repair, and its inverse association with disease activity suggests a potential therapeutic role in pIBD.