Transitional B cell subsets in human bone marrow

T-cell subsets and suppressor cells in human bone marrow.

To characterize immune suppressive and hematopoietic features of enriched subsets of human marrow cells, we separated these cells on Percoll density gradients. CD4+ and CD8+ T cells (CD3+) were enriched in the high-density marrow cell fractions and reduced in low-density fractions. CD4-CD8- (CD3+) T cells expressing the alpha beta T-cell antigen receptor were at least 10 times less numerous tha...

Human Bone Marrow Lymphocytes : B and T Cell

Characterization of the different lymphocyte populations in normal human bone marrow (BM) was attempted and compared to that in the peripheral blood (PB). B cells comprised 34% ± 11% of lymphocytes in BM and 23% ± 9% in PB. The majority of B cells carried 1gM in BM and lgG in the PB. In the BM, cells carrying complement or F receptors were fewer than cells carrying Ig, but in the PB they were e...

Characterization and functional analysis of adult human bone marrow cell subsets in relation to B-lymphoid development.

To study the frontiers between pluripotent stem cells and committed progenitors and to further define the B-cell pathway in adult bone marrow (BM), CD34+ subpopulations and CD34- B-lineage cells were analyzed by multiparameter flow cytometry, studied by light and electron microscopy, and in short-term and long-term cultures (LTC). While the total CD34+ cells represent 4.9% +/- 0.8 of BM mononuc...

Lymphocyte subsets in normal bone marrow.

Bone marrow aspirates and biopsies from ten normal donors were stained directly with monoclonal antibodies specific for lymphocyte, monocyte, and myeloid antigens, and were analyzed by flow cytometry. To avoid cell loss, lymphocytes were not specifically isolated prior to staining. T cells comprised 46% of aspirate lymphocytes and 22% of biopsy lymphocytes. Further, the Leu-3:Leu-2 ratio of bon...

Novel Human Transitional B Cell Populations