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Anemia of inflammation (AI), the most common anemia in ill patients, arises from chronic immune activation. Treatments combining iron and erythropoiesis-stimulating agents show promise, with future therapies targeting hepcidin.

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Area of Science:

  • Hematology
  • Immunology
  • Internal Medicine

Background:

  • Anemia of inflammation (AI), or anemia of chronic disease (ACD), is the most frequent anemia in hospitalized and chronically ill patients.
  • It is prevalent in conditions with prolonged immune activation like infection, autoimmune diseases, cancer, chronic kidney disease, heart failure, pulmonary diseases, and obesity.

Purpose of the Study:

  • To review the mechanisms, diagnosis, and treatment of anemia of inflammation.
  • To discuss challenges in diagnosing AI, especially with coexisting iron deficiency.
  • To explore current and future therapeutic strategies for AI.

Main Methods:

  • Literature review of mechanisms, diagnosis, and treatment of anemia of inflammation.
  • Analysis of the role of inflammation-inducible cytokines and hepcidin in iron homeostasis.
  • Examination of factors contributing to AI, including erythrocyte half-life and erythropoietin response.

Main Results:

  • Inflammation disrupts iron absorption and retention, leading to iron-restricted erythropoiesis.
  • Shortened erythrocyte lifespan, blunted erythropoietin response, and inhibited erythroid differentiation also contribute to AI.
  • Diagnosis is typically by exclusion, supported by altered iron indices (hypoferremia, hyperferritinemia), but coexisting iron deficiency complicates diagnosis.

Conclusions:

  • Current treatments for AI involve addressing the underlying disease and often include iron therapy and erythropoiesis-stimulating agents.
  • Future therapies may involve antagonizing hepcidin to redistribute iron for erythropoiesis.
  • Optimal AI treatment requires a better understanding of its contribution to morbidity and the impact of treatment on patient prognosis.