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Low plasma iron (hypoferremia) impairs neutrophil production and function during inflammation. Supplemental iron can restore neutrophil numbers, suggesting a targetable system for modulating innate immunity.

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Area of Science:

  • Immunology
  • Hematology
  • Cell Biology

Background:

  • Low plasma iron (hypoferremia), induced by hepcidin, is an inflammatory response that inhibits red blood cell production but its effect on white blood cell production is unknown.
  • Hepcidin is a key regulator of iron homeostasis and innate immunity.

Purpose of the Study:

  • To investigate the impact of hypoferremia on leukocytogenesis, specifically neutrophil production and function.
  • To determine if plasma iron levels influence the monocyte-to-neutrophil ratio and neutrophil activity.

Main Methods:

  • Proteomic data analysis to predict iron demands of different white blood cell types.
  • In vivo studies in mice using hepcidin-mediated hypoferremia, anti-Gr-1-induced neutropenia, and granulocyte colony-stimulating factor stimulation.
  • Assessment of neutrophil production, function, and NETosis under varying iron conditions.

Main Results:

  • Hepcidin-mediated hypoferremia significantly reduced granulocyte numbers in mice, while sparing monocytes, lymphocytes, and dendritic cells.
  • Neutrophil recovery from neutropenia was impaired during hypoferremia but restored with iron supplementation.
  • Hypoferremia inhibited granulopoiesis and inflammation-induced neutrophil accumulation, altered neutrophil antibacterial functions, and enhanced NETosis.

Conclusions:

  • Plasma iron levels critically modulate innate immunity by controlling the monocyte-to-neutrophil ratio and neutrophil effector functions.
  • Targeting plasma iron represents a potential therapeutic strategy for managing inflammatory and infectious conditions.