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Published on: November 3, 2018
Phenotype analysis of lymphocyte subsets in normal human bone marrow
1Department of Pathology, Medical College of Virginia, Richmond 23298.
Insights
CD8-positive T-cells in bone marrow exhibit distinct characteristics compared to peripheral blood, suggesting selective homing and effector functions. These findings highlight differences in T-lymphocyte subsets within different anatomical sites.
Area of Science:
- Immunology
- Hematology
Background:
- T-lymphocyte subsets play crucial roles in immune responses.
- Understanding T-cell distribution in bone marrow is vital for immune system research.
Purpose of the Study:
- To analyze T-lymphocyte subsets in bone marrow aspirates.
- To compare bone marrow T-cells with peripheral blood T-cells.
Main Methods:
- Monoclonal antibodies and flow cytometry were used for analysis.
- Bone marrow aspirates and peripheral blood from normal donors were analyzed.
- CD8-positive and CD4-positive T-lymphocyte subsets were quantified.
Main Results:
- CD8-positive T-cells in marrow showed high expression of CD2 and CD3.
- CD8-positive marrow T-cells were predominantly negative for CD11b, unlike peripheral blood.
- A higher percentage of marrow CD8-positive T-lymphocytes expressed HLA-DR compared to peripheral blood.
Conclusions:
- Results suggest selective homing of CD8-positive T-cells to the bone marrow.
- CD8-positive T-cells in the marrow are likely effector T-cells.
Abstract:
T-lymphocyte subsets in marrow aspirates taken from normal donors were analyzed with the use of monoclonal antibodies and flow cytometry. Peripheral blood specimens from the same donors were analyzed concurrently and served as controls. Eighty-six percent of CD8-positive cells from marrow expressed the pan-T-cell markers CD2 and CD3, compared with 91% and 81%, respectively, of CD8-positive cells from peripheral blood. Virtually all CD8-positive marrow lymphocytes, however, were negative for CD11b as opposed to peripheral blood, where 18% exhibited positivity for this marker. Further, a higher percentage of marrow CD8-positive T-lymphocytes expressed HLA-DR (15.4%) than did those from peripheral blood (4%). Marrow CD4-positive subsets did not differ substantially from those of peripheral blood. These results support the concept of a selective homing of CD8-positive T-cells to the marrow and indicate that CD8-positive T-cells in the marrow are effector T-cells.
