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Published on: March 27, 2014
A simple centrifugation method for harvesting myeloblasts
1Third Department of Internal Medicine, Nippon Medical School, Tokyo, Japan. ogata@nms.ac.jp
Abstract:
Myeloblast-rich samples, required for investigation of myeloid malignancies, can be obtained only during the untreated stage of leukemia. Existing methods for myeloblast enrichment have various prerequisites that limit their application. In this new method, a mixture of peripheral blood (Mixed PB) from an acute myeloid leukemia (AML) patient and from a healthy control containing 5% myeloblasts was subjected to density gradient centrifugation using a 14.5% metrizamide solution. Both high purity (86.3% +/- 1.5%) and high recovery of viable myeloblasts were achieved. Close to 100-fold blast enrichment, even from Mixed PB containing only 0.15% myeloblasts, was achieved. Similarly, this method highly enriched myeloblasts from unprocessed samples, including marrow cells, from patients with AML, myelodysplastic syndromes, and chronic myeloid leukemia (purity: 2.7% +/- 2.0% before separation, 56.6% +/- 28.3% after separation) (n = 22). The enriched blasts were suitable for various analyses, eg, flow cytometry, immunocytochemistry, cytochemistry, fluorescence in situ hybridization, and gene analysis.
Insights
A new density gradient centrifugation method effectively enriches myeloblasts from leukemia samples. This technique achieves high purity and recovery, crucial for investigating myeloid malignancies.
Area of Science:
- Hematology
- Molecular Biology
- Cancer Research
Background:
- Myeloid malignancies require myeloblast-rich samples, typically available only in untreated leukemia.
- Current myeloblast enrichment methods have limitations restricting their use.
Purpose of the Study:
- To develop a novel, efficient method for enriching myeloblasts from various leukemia sample types.
- To assess the purity and recovery of myeloblasts using the new technique.
Main Methods:
- Density gradient centrifugation using a 14.5% metrizamide solution was applied to peripheral blood and marrow samples.
- Samples included mixtures of patient and healthy donor blood, as well as unprocessed patient samples.
Main Results:
- High purity (86.3% +/- 1.5%) and recovery of viable myeloblasts were achieved.
- A nearly 100-fold enrichment was observed even in samples with as low as 0.15% myeloblasts.
- Significant enrichment was also demonstrated in samples from patients with acute myeloid leukemia, myelodysplastic syndromes, and chronic myeloid leukemia.
Conclusions:
- The developed density gradient centrifugation method provides high purity and recovery of myeloblasts.
- Enriched myeloblasts are suitable for downstream molecular and cellular analyses.
- This method offers a valuable tool for the investigation of myeloid malignancies.
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