Erythropoiesis lagging? pIgA1 steps in to assist Epo

Although erythropoietin (Epo) is commonly used as a therapy for anemia, recent studies have suggested that Epo therapy is associated with adverse outcomes. A new study shows that polymeric IgA1 positively regulates erythropoiesis through binding to transferrin receptor 1 (Tfr1), suggesting new therapeutic routes for anemia (pages 1456–1465).