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• W2891496794 abstract "Inhibition of tumor necrosis factor-α (TNF) signaling is beneficial in the management of ulcerative colitis (UC), but up to one-third of patients do not have a clinical response of relevance to TNF inhibitors during induction therapy (i.e. primary non-responders [PNRs]). Through production of prostaglandins (PGs) and thromboxanes, cyclooxygenase-2 (COX-2) affects inflammation and epithelial regeneration and may in this way be implicated in treatment resistance to TNF inhibitors.In this study, COX-2 expression was analyzed in human intestinal biopsies and patient-derived monocytes, and the downstream consequences of COX-2 activity was evaluated by assessing the influence of the down-stream effector, PGE2, on intestinal epithelial stem cell self-renewal and differentiation using primary human intestinal organoids (mini-guts).We found that TNF stimulation induced COX-2 expression in monocytes isolated from responders (Rs), whereas COX-2 expression was constitutively high and non-inducible in monocytes from PNRs. Additionally, PGE2 in combination with proliferative signals transformed human intestinal epithelial cells to a proinflammatory state akin to flaring UC, whereas PGE2 in combination with differentiation signals supported robust mucin induction.Our work indicates that COX-2-PGE2 signaling could be a novel target for the management of PNRs to TNF inhibitors. We additionally demonstrate that COX-2-PGE2 signaling has dual functions during tissue repair and normal lineage differentiation, explaining in part the lack of response to TNF inhibitors among PNRs. FUND: This work was funded by grants from the Novo Nordisk Foundation, the Lundbeck Foundation, the Vanderbilt Digestive Disease Research Center, NIH Grants, Aase and Ejnar Danielsen's Foundation and the A.P. Møller Foundation." @default.
• W2891496794 created "2018-09-27" @default.
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• W2891496794 date "2018-10-01" @default.
• W2891496794 modified "2023-10-17" @default.
• W2891496794 title "COX-2–PGE2 Signaling Impairs Intestinal Epithelial Regeneration and Associates with TNF Inhibitor Responsiveness in Ulcerative Colitis" @default.
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• W2891496794 doi "https://doi.org/10.1016/j.ebiom.2018.08.040" @default.
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