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The diagnostic value of bone marrow iron
1Anatomisches Institut, Universität Bonn, FRG.
Abstract:
The light and electronmicroscopic representation of non-haemiron in the bone-marrow provides the unique opportunity of extensively evaluating the iron metabolism. In the bone-marrow, macrophages represent the physiological place of iron storage. The iron in the cytoplasma is stored in them in the form of free ferritin molecules and lysomally as aggregated ferritin and/or haemosiderin in siderosomes. In an equal iron balance and unimpaired internal iron exchange only erythroblasts (sideroblasts) and erythrocytes (siderocytes) of the bone-marrow besides macrophages possess siderosomes. In addition to this physiological or orthotopic iron storage a heterotopic iron storage can be observed under pathological conditions, particularly with iron overloading of the organism, in the endothelial cells of sinusoids and plasma cells. In detail, the patterns of iron storage in the bone-marrow are described in the different stages of iron deficiency, disturbance of iron utilization in chronically inflammatory processes or tumour diseases, condition after intravenous iron administration, transfusion siderosis, hereditary haemochromatosis and sideroblastic anaemia.
Insights
This study examines non-heme iron in bone marrow, revealing how macrophages and other cells store iron. Understanding these iron storage patterns is crucial for diagnosing various anemias and iron overload disorders.
Area of Science:
- Hematology
- Cell Biology
- Medical Biochemistry
Background:
- Bone marrow macrophages are key sites for iron storage.
- Iron is stored as ferritin and haemosiderin within cellular compartments called siderosomes.
- Erythroblasts and erythrocytes also contain siderosomes under normal iron balance.
Purpose of the Study:
- To extensively evaluate iron metabolism using light and electron microscopy of non-heme iron in bone marrow.
- To describe physiological and pathological iron storage patterns in bone marrow.
- To correlate iron storage with various clinical conditions.
Main Methods:
- Light and electron microscopy of bone marrow samples.
- Analysis of non-heme iron distribution and cellular localization.
- Histochemical staining for iron.
Main Results:
- Macrophages exhibit physiological iron storage in ferritin and haemosiderin within siderosomes.
- Erythroblasts and erythrocytes normally contain siderosomes.
- Pathological conditions show heterotopic iron storage in endothelial cells and plasma cells, especially in iron overload.
Conclusions:
- Bone marrow iron storage patterns visualized by microscopy are indicative of overall iron metabolism.
- Microscopic evaluation of bone marrow iron is essential for diagnosing iron deficiency, iron overload, and related anemias.
- Distinct iron storage patterns in various cell types aid in differentiating pathological conditions like hemochromatosis and sideroblastic anemia.