JOURNAL ARTICLE
REVIEW
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Role of Incretin Hormones in Bowel Diseases.

Enteroendocrine cells (EEC) have been studied extensively for their ability to regulate gastrointestinal motility and insulin release by secretion of peptide hormones. In particular, the L cell-derived incretin glucagon-like peptide 1 has gained enormous attention due to its insulinotropic action and relevance in the treatment of type 2 diabetes. Yet, accumulating data indicates a critical role for EEC and incretins in metabolic adaptation and in orchestrating immune responses beyond blood glucose control. EEC actively sense the lamina propria and luminal environment including the microbiota via receptors and transporters, subsequently mediating signals by secreting hormones and cytokines. Data indicate that immune cells and cytokine-mediated signaling impacts EEC numbers and function during infection and chronic inflammation of the gut, suggesting EEC not only to play a role in these pathologies but also being a target of inflammatory processes. This review presents data on the interrelation of incretins and inflammatory signaling. It focuses on the impact of intestinal inflammation, in particular inflammatory bowel disease, on EEC and the potential role of EEC and incretins in these pathologies. Furthermore, it highlights endoplasmic reticulum unfolded protein response, cytokines and the intestinal microbiota as possible targets of inflammatory and EEC signaling.

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