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Department of Genetic Medicine and Development (E.Z., P.A.H.), University Medical Centre and Division of Surgical Research (E.Z., T.B., D.B.), Department of Surgery, University Hospital, Geneva CH-1211, Switzerland; and Division of Endocrinology and Diabetes (K.M., M.Y.D.), University Hospital, Zurich CH-8091, Switzerland
Address all correspondence and requests for reprints to: Philippe A. Halban, Department of Genetic Medicine and Development, University Medical Center, 1 rue Michel-Servet, 1211 Geneva 4, Switzerland. E-mail: philippe.halban{at}medecine.unige.ch.
Decreased functional ß-cell mass in type 1 and type 2 diabetes is due to ß-cell apoptosis and impaired secretory function suggested to be mediated, in part, by immune- and/or high-glucose-induced production of IL-1ß acting through the nuclear factor
B (NF
B)/Fas pathway. The aim of this study was to determine whether two drugs believed to block NF
B activation, the thiazolidinedione (glitazone) pioglitazone and the nonsteroidal antiinflammatory drug sodium salicylate, can protect human ß-cells against the toxic effects of IL-1ß and high glucose in vitro. Human islets were maintained in culture 24 d at 100 mg/dl (5.5 mM) glucose with or without (control) IL-1ß or at 600 mg/dl (33.3 mM) glucose. IL-1ß and 600 mg/dl glucose increased ß-cell apoptosis and abolished short-term glucose-stimulated insulin secretion. Both drugs protected partially against loss of glucose-stimulated insulin secretion and prevented completely increased apoptosis caused by IL-1ß or 600 mg/dl glucose. IL-1ß secretion from islets was increased by 4-d culture at 600 mg/dl, and this was blocked by pioglitazone. Both drugs prevented activation of ß-cell NF
B by high glucose. Pioglitazone and sodium salicylate thus protect human islets against the detrimental effects of IL-1ß and high glucose by blocking NF
B activation and may therefore be useful in retarding the manifestation and progression of diabetes.
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