Divalent metal transporter 1 regulates iron-mediated ROS and pancreatic β cell fate in response to cytokines.
Reactive oxygen species (ROS) contribute to target-cell damage in inflammatory and iron-overload diseases. Little is known about iron transport regulation during inflammatory attack. Through a combination of in vitro and in vivo studies, we show that the proinflammatory cytokine IL-1β induces divalent metal transporter 1 (DMT1) expression correlating with increased β cell iron content and ROS production. Iron chelation and siRNA and genetic knockdown of DMT1 expression reduce cytokine-induced ROS formation and cell death. Glucose-stimulated insulin secretion in the absence of cytokines in Dmt1 knockout islets is defective, highlighting a physiological role of iron and ROS in the regulation of insulin secretion. Dmt1 knockout mice are protected against multiple low-dose streptozotocin and high-fat diet-induced glucose intolerance, models of type 1 and type 2 diabetes, respectively. Thus, β cells become prone to ROS-mediated inflammatory damage via aberrant cellular iron metabolism, a finding with potential general cellular implications.
Hansen, JB; Tonnesen, MF; Madsen, AN; Hagedorn, PH; Friberg, J; Grunnet, LG; Heller, RS; Nielsen, AØ; Størling, J; Baeyens, L; Anker-Kitai, L; Qvortrup, K; Bouwens, L; Efrat, S; Aalund, M; Andrews, NC; Billestrup, N; Karlsen, AE; Holst, B; Pociot, F; Mandrup-Poulsen, T
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