Separation of human bone marrow cells by sedimentation

Area of Science:

• Hematology
• Cell Biology
• Biochemistry

Background:

• Human bone marrow contains diverse cell populations crucial for hematopoiesis.
• Understanding the cell cycle dynamics of these populations is vital for diagnosing and treating bone marrow disorders.

Purpose of the Study:

• To differentiate human bone marrow cell subpopulations based on their buoyant density.
• To correlate cell cycle phases with specific bone marrow cell types.
• To evaluate the utility of density gradient centrifugation for studying bone marrow cell kinetics.

Main Methods:

• Unit gravity sedimentation of human bone marrow cells over 15 hours at 4°C.
• Utilized a linear density gradient of Ficoll (1.020–1.065 g/ml).
• Cell cycle phase analysis using a cytofluorograph.

Main Results:

• Differential migration of bone marrow subpopulations observed, with distinct mean densities for lymphocytes, granulocytes, myeloid cells, and megakaryocytes.
• Highest percentages of S phase and G2/M phase cells found in immature myeloid cell peaks (myeloblasts, promyelocytes, myelocytes).

Conclusions:

• Density gradient centrifugation effectively separates human bone marrow cell subpopulations.
• This method can be applied to investigate cell cycle kinetics in pathological conditions such as leukemia.
• The technique is useful for assessing the efficacy of antimitotic agents.