Concise review: how do red blood cells born, live, and die?

Area of Science:

• Hematology
• Cell Biology
• Immunology

Background:

• Red blood cells (RBCs) have an average lifespan of 120 days.
• Aging RBCs are recognized and removed by macrophages, primarily in the spleen and liver.
• Iron from hemoglobin is recycled, while heme is degraded and eliminated.

Purpose of the Study:

• To provide an overview of red blood cell formation, life cycle, and death.
• To highlight the morphological aspects of RBC processing in the bone marrow and spleen.
• To integrate cytological, immunological, and biophysical perspectives on RBC biology.

Main Methods:

• Analysis of RBC life cycle and removal processes.
• Examination of morphological changes using transmission and scanning electron microscopy.
• Review of historical and recent findings on RBC clearance sites.

Main Results:

• RBCs are phagocytosed by macrophages in the spleen and bone marrow.
• Iron recycling and heme degradation are key components of RBC removal.
• Morphological details of RBC processing were visualized via electron microscopy.

Conclusions:

• The study provides a comprehensive overview of the RBC life cycle, from birth to death.
• Macrophage-mediated phagocytosis in the spleen and bone marrow is crucial for RBC homeostasis.
• Morphological insights enhance understanding of RBC clearance mechanisms.