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Updated: Aug 10, 2026
Isolation of Precursor B-cell Subsets from Umbilical Cord Blood
Published on: April 16, 2013
Identification of novel B-lineage cells in human fetal bone marrow that coexpress CD7
E R Grümayer1, F Griesinger, D S Hummell
1Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis 55455.
Insights
Researchers identified CD7 expression on a subset of B cells in fetal bone marrow, suggesting potential B-cell precursors or an alternative B-cell development pathway.
Area of Science:
- Immunology
- Developmental Biology
- Hematopoiesis
Background:
- Fetal bone marrow is a critical site for early lymphoid development.
- Understanding cell surface markers aids in characterizing immune cell populations.
- The role of CD7 in B-cell lineage development requires further elucidation.
Purpose of the Study:
- To investigate the expression of CD7 on fetal bone marrow cells.
- To characterize CD7-expressing populations within the B-cell lineage.
- To explore the implications of CD7 expression on B-cell development.
Main Methods:
- Multiparameter flow cytometry and cell sorting were employed.
- Fetal bone marrow samples were analyzed for cell surface markers.
- Immunophenotyping was performed to identify distinct cell populations.
Main Results:
- CD7 was found on a subset of CD19+ B cells, including pre-B and mature B cells.
- A distinct CD7+19+ population, negative for TdT, was identified.
- CD10 expression was limited in the CD7+19+ population, differentiating it from typical B cells.
Conclusions:
- The CD7+19+ cell population may represent B-lineage committed cells or uncommitted lymphoid precursors.
- CD7 expression on B-lineage cells suggests the presence of lymphoid precursors or an alternative B-cell development pathway.
Abstract:
In the present study we used multiparameter flow cytometry and cell sorting to evaluate fetal bone marrow, a rich source of cells early in lymphoid development. We found CD7 to be expressed on a subset of CD19+ cells, including some that had matured to cytoplasmic mu+ (pre-B) and surface mu+ (B) cells. In addition, a less mature CD7+19+ population was characterized as mu- and CD34+/-. The CD7+19+ population was clearly distinct from the mature T cells. The CD7+19+ cells were negative for nuclear TdT in contrast to CD7-19+ cells, which frequently contained TdT. CD10, which is coexpressed on the cell surface of more than 90% of CD19+ lymphocytes, was detected in a minority of CD7+19+ lymphocytes. The CD7+19+34+ cell population may be B-lineage committed, or may represent uncommitted lymphoid precursors. The biologic role of the expression of CD7 on immature and mature cells, including those of the B lineage, may indicate (1) the presence of CD7+19+ lymphoid precursor cells and/or (2) an alternate pathway of B-cell development, in which cells coexpress CD7 with other B-lineage markers.
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