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A method for isolating neutrophils from moderate volumes of human blood
1Letterman Army Institute of Research, Division of Blood Research, Presidio of San Francisco, CA 94129.
Abstract:
The Flow Laboratories procedure for isolating polymorphonuclear leukocytes (PMNs) from human blood whereby whole blood is centrifuged through Mono-Poly resolving medium (MPRM) has been modified. Using this modification, as much as 30 ml of whole blood could be processed in a single centrifuge tube, and erythrocyte contamination of the final PMN suspension was reduced significantly. PMN suspensions were composed of 96% neutrophils, and neutrophil recovery was 42-55% depending upon the volume of blood processed. Cell viability was 98% as determined by trypan blue exclusion. Greater than 99% of the neutrophils were spherical suggesting that the neutrophils were not primed during isolation.
Insights
This study modified a method for isolating polymorphonuclear leukocytes (PMNs) from blood. The enhanced technique processes more blood with less red cell contamination, yielding high-purity, viable neutrophils.
Area of Science:
- Hematology
- Cell Biology
- Immunology
Background:
- Isolation of polymorphonuclear leukocytes (PMNs) is crucial for various research applications.
- Existing methods for PMN isolation have limitations in terms of blood volume processed and purity of the final cell suspension.
Purpose of the Study:
- To modify the Flow Laboratories procedure for isolating PMNs from human blood using Mono-Poly resolving medium (MPRM).
- To improve the efficiency and purity of PMN isolation from larger volumes of whole blood.
Main Methods:
- Modification of the standard centrifugation procedure using MPRM.
- Processing of whole blood in single centrifuge tubes.
- Assessment of erythrocyte contamination, PMN purity, recovery, and cell viability.
Main Results:
- The modified procedure allows processing of up to 30 ml of whole blood per tube.
- Significant reduction in erythrocyte contamination in the final PMN suspension.
- PMN suspensions achieved 96% purity with 42-55% neutrophil recovery.
- Cell viability was high (98%) and neutrophils remained spherical, indicating no priming during isolation.
Conclusions:
- The modified MPRM method offers an improved approach for isolating high-purity, viable PMNs from larger blood volumes.
- This enhanced protocol is suitable for research requiring substantial numbers of non-primed neutrophils.
- The procedure provides a reliable and efficient method for PMN isolation in hematological and immunological studies.