Isolation of mouse megakaryocytes. I. Separation of two fractions enriched in different maturational stages
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Abstract:
Megakaryocytes (MK) were isolated from mouse bone marrow by centrifugation on discontinuous gradients of isotonic albumin or Percoll and characterized by acetylcholinesterase (AChE) staining. The apparent density distributions of MK varied greatly depending upon the nature of the gradient medium and the composition of the cell suspension buffer while the density range of the other bone marrow cells remained largely unchanged. The present findings also indicate that the unusual morphological and functional characteristics of MK may underlie the observed shift in their density profile. Thrombocytopoietic stimulatory factor (TSF) was administered to mice 18 h before killing to elevate the normally low numbers of earlier MK in the bone marrow and to improve the yield of immature MK during the subsequent isolation procedure. Cells belonging to earlier stages in maturation were separated from the more mature ones on discontinuous Percoll density gradients, providing a basis for further investigation of MK development.
Insights
This study isolated megakaryocytes (MK) from mouse bone marrow, finding their density varies with isolation methods. This research aids in understanding megakaryocyte development and improving cell yield for future studies.
Area of Science:
- Hematology
- Cell Biology
- Biochemistry
Background:
- Megakaryocytes (MK) are crucial for platelet production.
- Understanding MK isolation and density is key to studying their development.
- Standard isolation methods can be influenced by medium and buffer composition.
Purpose of the Study:
- To investigate the density distribution of mouse bone marrow megakaryocytes.
- To explore how isolation techniques affect megakaryocyte yield and characteristics.
- To establish a method for separating immature from mature megakaryocytes for developmental studies.
Main Methods:
- Isolation of MK from mouse bone marrow using albumin or Percoll density gradients.
- Characterization of MK via acetylcholinesterase (AChE) staining.
- Administration of thrombocytopoietic stimulatory factor (TSF) to enhance immature MK numbers.
- Separation of immature and mature MK using discontinuous Percoll gradients.
Main Results:
- Megakaryocyte density profiles varied significantly based on gradient medium and buffer composition.
- Other bone marrow cell densities remained relatively consistent.
- TSF administration increased the yield of earlier-stage MK.
- Successful separation of immature from mature MK was achieved.
Conclusions:
- The unique properties of MK influence their density.
- Optimized isolation protocols are essential for accurate megakaryocyte research.
- This method provides a foundation for investigating megakaryocyte maturation stages.