Evaluating IL-21 as a Potential Therapeutic Target in Crohn's Disease

Gastroenterology Research and Practice
Thomas Lindebo HolmDorthe Lundsgaard

Abstract

Interleukin-21 (IL-21) is primarily a T cell-derived cytokine; it is upregulated in patients with Crohn's Disease (CD) and could be a potential new therapeutic target in CD. In human material, IL-21 and IL-21R expression was investigated by in situ hybridization (ISH) and immunohistochemistry (IHC) in noninflammatory bowel disease (non-IBD) controls and patients with CD. The pathologic role of IL-21 was examined in murine models of T cell-dependent and T cell-independent colitis, either with a neutralizing monoclonal antibody against IL-21 or with the transfer of CD4+CD45RBhighIL-21R-/- T cells. Colonic pathology was examined by endoscopy, histopathology, IHC, ELISA, and Luminex. In the human intestine, IL-21 and IL-21R mRNA and protein-expressing cells were observed in the mucosa, in lymphoid aggregates of submucosa in non-IBD controls, and in lymphoid aggregates of muscularis externa in patients with CD. IL-21 expression was most abundant in germinal centers (GCs) of the lymphoid aggregates, and IL-21R expression assessed semiquantitatively, was significantly higher in patients with CD compared to non-IBD controls. Following prophylactic and interventive anti-IL-21 mAb treatment in the adoptive transfer (AdTr) model, clinical...Continue Reading

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Methods Mentioned

BETA
FACS
flow cytometry
biopsies
confocal microscopy
ELISA

Software Mentioned

GraphPad Prism

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