Renal Division, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Ludwig-Maximilians-University Munich, Munich, Germany Correspondence: Dr. Stefanie Steiger, Renal Division, Department of Medicine IV, Ludwig-Maximilians-University Hospital, Ludwig-Maximilians-University Munich, Ziemssenstraße 5, 80336 Munich, Germany. Email: [email protected] Published online ahead of print. Publication date available at www.jasn.org. See related article, “Divergent Actions of Renal Tubular and Endothelial Type 1 IL-1 Receptor Signaling in Toxin-Induced AKI,” on pages 1629–1646.