Arterial iron regulates vasodilation during anemia via endothelial holo-α-globin.

Iron deficiency in female mice increases arterial nitric oxide signaling by reducing endothelial holo-α-globin, a process reversible with vascular iron repletion.

• Why it matters: Understanding how iron deficiency affects vascular function is crucial because it is a common cause of anemia and is linked to worsened cardiovascular disease, yet its direct vascular impact remains unclear.
• What they did: Researchers assessed iron levels in mouse and human endothelial cells, used a mouse model of iron deficiency anemia, and employed endothelial-specific α-globin knockout mice to investigate the regulation of NO signaling by iron and α-globin.
• The result: Findings show that iron deficiency elevates NO signaling in female mice through loss of endothelial holo-α-globin, and this effect can be reversed by iron repletion, highlighting iron’s role in modulating endothelial function via α-globin regulation.