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Updated: Aug 18, 2026
An In vitro Model to Study Heterogeneity of Human Macrophage Differentiation and Polarization
Published on: June 12, 2013
Influence of five different anticoagulants on human blood monocyte isolation and functional activities
Abstract:
The recovery of blood monocytes after centrifugation with metrizoate/polysucrose was high with EDTA (97.0%) and heparin (91.6%) as anticoagulants, moderate with EGTA and citrate, but low with oxalate (52.3%; P less than 0.05 compared with heparin). There were no differences in viability, spontaneous migration, chemotaxis, or phagocytosis and killing of Candida albicans by the monocytes isolated from blood anticoagulated with heparin, citrate, oxalate, EDTA, or EGTA. However, heparin in concentrations above 20 IU/ml decreased the spontaneous migration and chemotaxis. It is concluded, that EDTA and heparin below 20 IU/ml are the most satisfactory anticoagulants for the functional study of blood monocytes isolated by metrizoate/polysucrose density centrifugation.
Insights
Ethylenediaminetetraacetic acid (EDTA) and heparin (below 20 IU/ml) are best for isolating blood monocytes for functional studies. Other anticoagulants like oxalate showed lower monocyte recovery rates.
Area of Science:
- Immunology
- Hematology
- Cell Biology
Background:
- Accurate isolation of blood monocytes is crucial for studying their function.
- Metrizoate/polysucrose density centrifugation is a common method for monocyte isolation.
- The choice of anticoagulant can impact monocyte recovery and function.
Purpose of the Study:
- To evaluate the efficacy of different anticoagulants for blood monocyte isolation using metrizoate/polysucrose density centrifugation.
- To assess the impact of anticoagulants on monocyte viability and key immune functions.
Main Methods:
- Blood samples were anticoagulated with EDTA, heparin, EGTA, citrate, or oxalate.
- Monocytes were isolated using metrizoate/polysucrose density centrifugation.
- Monocyte recovery, viability, spontaneous migration, chemotaxis, and phagocytosis were measured.
Main Results:
- High monocyte recovery was observed with EDTA (97.0%) and heparin (91.6%).
- Oxalate resulted in significantly lower monocyte recovery (52.3%).
- No significant differences in monocyte viability or phagocytic functions were found across anticoagulants, but high heparin concentrations (>20 IU/ml) impaired migration.
Conclusions:
- EDTA and low-concentration heparin (<20 IU/ml) are optimal anticoagulants for isolating blood monocytes for functional studies via metrizoate/polysucrose centrifugation.
- Careful selection of anticoagulants is necessary to ensure reliable results in monocyte research.
- Functional assays like chemotaxis are sensitive to anticoagulant choice and concentration.
