RT Journal Article T1 Experimental and genetic evidence for the impact of CD5 and CD6 expression and variation in inflammatory bowel disease. A1 Casado-Llombart, Sergi A1 Velasco-de Andres, Maria A1 Catala, Cristina A1 Leyton-Pereira, Alejandra A1 Gutierrez-Cozar, Rebeca A1 Suarez, Belen A1 Armiger, Noelia A1 Carreras, Esther A1 Esteller, Miriam A1 Ricart, Elena A1 Ordas, Ingrid A1 Gisbert, Javier P A1 Chaparro, Maria A1 Esteve, Maria A1 Marquez, Lucia A1 Busquets, David A1 Iglesias, Eva A1 Garcia-Planella, Esther A1 Martin-Arranz, Maria Dolores A1 Lohmann, Juliane A1 Ayata, C Korcan A1 Niess, Jan Hendrik A1 Engel, Pablo A1 Panes, Julian A1 Salas, Azucena A1 Domenech, Eugeni A1 Lozano, Francisco K1 CD5 K1 CD6 K1 Crohn’s disease K1 inflammatory bowel disease K1 ulcerative colitis AB Crohn's disease (CD) and ulcerative colitis (UC) are inflammatory bowel diseases (IBD) resulting from the interaction of multiple environmental, genetic and immunological factors. CD5 and CD6 are paralogs encoding lymphocyte co-receptors involved in fine-tuning intracellular signals delivered upon antigen-specific recognition, microbial pattern recognition and cell adhesion. While CD5 and CD6 expression and variation is known to influence some immune-mediated inflammatory disorders, their role in IBD remains unclear. To this end, Cd5- and Cd6-deficient mice were subjected to dextran sulfate sodium (DSS)-induced colitis, the most widely used experimental animal model of IBD. The two mouse lines showed opposite results regarding body weight loss and disease activity index (DAI) changes following DSS-induced colitis, thus supporting Cd5 and Cd6 expression involvement in the pathophysiology of this experimental IBD model. Furthermore, DNA samples from IBD patients of the ENEIDA registry were used to test association of CD5 (rs2241002 and rs2229177) and CD6 (rs17824933, rs11230563, and rs12360861) single nucleotide polymorphisms with susceptibility and clinical parameters of CD (n=1352) and UC (n=1013). Generalized linear regression analyses showed association of CD5 variation with CD ileal location (rs2241002CC) and requirement of biological therapies (rs2241002C-rs2229177T haplotype), and with poor UC prognosis (rs2241002T-rs2229177T haplotype). Regarding CD6, association was observed with CD ileal location (rs17824933G) and poor prognosis (rs12360861G), and with left-sided or extensive UC, and absence of ankylosing spondylitis in IBD (rs17824933G). The present experimental and genetic evidence support a role for CD5 and CD6 expression and variation in IBD's clinical manifestations and therapeutic requirements, providing insight into its pathophysiology and broadening the relevance of both immunomodulatory receptors in immune-mediated disorders. PB Frontiers Research Foundation YR 2022 FD 2022-08-31 LK http://hdl.handle.net/10668/20591 UL http://hdl.handle.net/10668/20591 LA en NO Casadó-Llombart S, Velasco-de Andrés M, Català C, Leyton-Pereira A, Gutiérrez-Cózar R, Suárez B, et al. Experimental and genetic evidence for the impact of CD5 and CD6 expression and variation in inflammatory bowel disease. Front Immunol. 2022 Sep 21;13:966184 DS RISalud RD Apr 10, 2025