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Updated: Jul 5, 2026
Isolation of Mouse Megakaryocyte Progenitors
Published on: May 20, 2021
Culture, expansion, and differentiation of murine megakaryocytes
Ramesh A Shivdasani1, Harald Schulze
1Dana-Farber Cancer Institute, Brigham and Women's Hospital, and Harvard Medical School, Boston, Massachusetts, USA.
Abstract:
Megakaryocytes (MKs) are the source of circulating platelets and are readily recognized by their large size and distinctive morphology. Their poor representation in hematopoietic tissues often requires considerable ex vivo expansion to generate cells for biochemical and cell biological studies. These experimental protocols describe the assessment of megakaryocytic potential within hematopoietic precursor cells in the bone marrow by colony-forming assays and expansion and enrichment of MKs from cultured fetal liver or spleen or bone marrow cells. Although these MKs are not synchronized in their maturation, they can be enriched over an albumin step-gradient and one-third to one-half of recovered cells will typically elaborate proplatelets, the immediate precursors of blood platelets. Both protocols require recombinant thrombopoietin (TPO) as a growth factor. Support Protocols describe methods for preparing fetal liver cells, identifying mature rodent MKs by staining for acetylcholinesterase activity, and staining (May-Grünwald-Giemsa) mixed populations on cytocentrifuged blood cell preparations.
Insights
This study details methods for expanding megakaryocytes (MKs), the cells that produce platelets, from bone marrow and fetal liver. These protocols enable the generation of sufficient MKs for research, aiding platelet production studies.
Area of Science:
- Hematology
- Cell Biology
- Developmental Biology
Background:
- Megakaryocytes (MKs) are crucial for platelet production but are scarce in hematopoietic tissues.
- Generating sufficient MKs ex vivo is essential for biochemical and cell biological research.
Purpose of the Study:
- To describe protocols for assessing megakaryocytic potential in hematopoietic precursors.
- To outline methods for expanding and enriching MKs from various hematopoietic tissues.
- To provide supporting protocols for MK identification and preparation.
Main Methods:
- Colony-forming assays to evaluate megakaryocytic potential in bone marrow precursors.
- Ex vivo expansion and enrichment of MKs from cultured fetal liver, spleen, or bone marrow.
- Albumin density gradient centrifugation for MK enrichment.
- Recombinant thrombopoietin (TPO) as a key growth factor.
- Support protocols include fetal liver cell preparation, acetylcholinesterase staining, and May-Grünwald-Giemsa staining.
Main Results:
- Established protocols for assessing and expanding MKs ex vivo.
- Demonstrated enrichment of MKs using albumin density gradients.
- Showed that a significant proportion of enriched MKs elaborate proplatelets, the precursors to platelets.
- Validated supporting methods for MK identification and sample preparation.
Conclusions:
- The described protocols effectively enable the assessment, expansion, and enrichment of megakaryocytes from hematopoietic tissues.
- These methods provide a reliable source of MKs for various research applications, including platelet biology studies.
- The protocols are supported by validated techniques for MK identification and sample preparation.
