Heightened Expression of CD39 by Regulatory T Lymphocytes Is Associated with Therapeutic Remission in Inflammatory Bowel Disease

Inflammatory Bowel Diseases
David J GibsonElizabeth J Ryan

Abstract

To evaluate whether changes in expression of CD39 by regulatory T lymphocytes (Treg) impact treatment response in inflammatory bowel disease. To then define the biological role of expression of CD39 on Treg in an animal model of colitis. A prospective study of consecutive patients commencing anti-tumor necrosis factor therapy with infliximab (IFX) or adalimumab (ADA), who were then followed for 12 months. Treatment responses were defined both symptomatically and by endoscopy showing mucosal healing. Peripheral blood Tregs were quantified by flow cytometry. Functional importance of CD39 expression by Treg was determined in an adoptive T-cell transfer model of colitis. Forty-seven patients (ulcerative colitis, n = 22; Crohn's disease, n = 25) were recruited; 16 patients were complete responders and 13 nonresponders to anti-tumor necrosis factor. CD39 expression by Treg was lower in active inflammatory bowel disease and increased significantly after treatment in responders (CD39Treg/total Treg; 8% at baseline to 22.5% at late time point, P < 0.001). Responders were more likely to have therapeutic drug levels and in multivariate analysis therapeutic drug levels were associated with higher expression of CD39 by FoxP3 Treg and lower ...Continue Reading

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