P056 Transcriptional profiling of intestinal epithelial organoids derived from paediatric Crohn’s disease patients
I. Dotti*1, E. Ferrer-Picón1, N. Planell1, J. Martín de Carpi2, G. Pujol2, M. Masamunt1, M. Esteller1, A. Carrasco3, L. Alvarez2, E. Tristán3, I. Ordás1, M. Esteve3, E. Ricart1, A. Salas1
1IDIBAPS, Hospital Clínic, CIBERehd, Department of Gastroenterology, Barcelona, Spain, 2Hospital Sant Joan de Deu, Department of Gastroenterology, Hepatology and Pediatric Nutrition, Barcelona, Spain, 3Hospital Universitari Mutua Terrassa, Department of Gastroenterology, Terrassa, Barcelona, Spain
Crohn’s disease (CD) is a chronic inflammatory bowel disease (IBD) with onset occurring from childhood to late age. Despite a comparable genetic susceptibility, disease phenotype and natural history vary between paediatric and adult-onset CD. Recent studies have highlighted the importance of the intestinal epithelial barrier in the pathogenesis of IBD   .
We hypothesise that the intestinal epithelium of patients with CD is characterised by age-dependent differences in the gene expression signature.
Biopsy samples from the ileum and colon of paediatric and adult patients with CD were collected. Isolated crypt units were used to generate epithelial organoid cultures (EpOCs). After
Paediatric and adult EpOCs followed similar differentiation programmes when induced to generate d-EpOCs, while maintaining a colon vs. ileum-specific pattern of marker expression. Nonetheless, a panel of genes was significantly altered in colonic EpOCs generated from paediatric vs. adult CD patients. Several of these genes were associated with the induction of a pro-inflammatory response (ie, CXCL gene family, REG1A, RETNLB).
Our results suggest that paediatric patients with CD harbour specific lasting alterations in the epithelial compartment. This could contribute to differently shaping the phenotype of the disease in these patients.
1. Planell N, Lozano JJ, Mora-Buch R,
2. Mora-Buch R, Dotti I, Planell N,
3. Dotti I, Mora-Buch R1, Ferrer-Picón E,