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. 1986 May;64(2):356–363.

Characterization of early lymphoid precursor cells in the human fetus using monoclonal antibodies and anti-terminal deoxynucleotidyl transferase.

G E Asma, R L van den Bergh, J M Vossen
PMCID: PMC1542329  PMID: 3742878

Abstract

Monoclonal antibodies (MoAbs) directed primarily against immature lymphoid cells (VIL-A1, BA-2, OKT10) or recognizing antigens associated with the B cell lineage (VIB-C5, OKI1) were used for the identification of lymphoid cells in liver, bone marrow, spleen and thymus of human fetuses between 8 and 20 weeks of gestational age. Many lymphocytes in liver, bone marrow and spleen reacted with the MoAbs used. In the fetal thymus, however, cells did not bind to the VIL-A1 and VIB-C5 MoAbs and only a few cells were BA-2+ or OKI1+. In the liver and bone marrow the VIL-A1, VIB-C5 and BA-2 MoAbs reacted almost exclusively with terminal deoxynucleotidyl transferase (TdT) containing cells, pre-B and B cells. TdT+ cells were present in liver, bone marrow and thymus, but not in the spleen. In liver and bone marrow the relative numbers of TdT+ cells decreased during gestation, in the thymus they increased. The antigenic make-up of the TdT+ cells in liver and bone marrow was comparable to that of pre-B and B cells in these organs: most of them reacted with VIL-A1, VIB-C5 and OKT10 MoAbs and many were BA-2+ and OKI1+. TdT+ cells in liver and bone marrow did not bind to T-cell-markers, i.e. OKT6 and WT-1. A few lymphoid cells in these organs contained TdT and mu heavy chains. TdT+ cells in the thymus had a completely different phenotype: most of them were OKT6+ and they did not react with the VIL-A1 and VIB-C5 MoAbs. These findings suggest that TdT+ cells in fetal liver and bone marrow are precursors of the B cell lineage, whereas those in the thymus probably belong to the T cell lineage. In the fetal spleen almost all B cells displayed the VIB-C5 and OKI1 antigens. At 12 weeks of gestation greater than 80% of splenic B cells were also VIL-A1+ and BA-2+; with ongoing gestation far less B cells in spleen expressed these antigens, however, indicating that these B cells are more mature than those in fetal liver and bone marrow, but still less mature than the B cells in postnatal blood and bone marrow, which do not display the VIL-A1 and BA-2 markers. These findings suggest that some further maturation of B cell stages takes place in the spleen during human fetal life.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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