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Abstract 


A monoclonal antibody, A7R34, that recognizes the high-affinity interleukin 7 receptor (IL-7Ra) and blocks the binding between IL-7 and IL-7Ra has been produced. Cell surface staining with A7R34 demonstrated that IL-7Ra is expressed in both B- and T-cell lineages. In the bone marrow, immature B-lineage cells that do not express surface IgM were IL-7Ra+. In the thymus, IL-7Ra was detected in CD4-8- T cells and also in CD4 or CD8 single-positive cells but not in CD4+8+ double-positive cells. In the peripheral lymphoid tissues, both CD4 and CD8 single-positive cells were the major cell types that express IL-7Ra. Addition of A7R34 to a long-term B-precursor-cell culture inhibited proliferation of the B-lineage cells, indicating that IL-7 is an absolute requirement for in vitro B-cell genesis. Consistent with this in vitro result, continuous injection of A7R34 into an adult mouse resulted in a decrease of B-precursor cells and also of thymocytes, whereas a considerable fraction of mature B and T cells in the peripheral tissues persisted over 2 weeks of the experiment. When A7R34 injection is started from day 14 of gestation, it is possible to produce mice that lack B cells. These results indicate that IL-7 is an essential molecule for generation of both B and T cells in murine bone marrow and thymus, respectively. Moreover, IL-7Ra would be the sole receptor system regulating these processes.

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Proc Natl Acad Sci U S A. 1993 Oct 1; 90(19): 9125–9129.
PMCID: PMC47514
PMID: 8415665

Expression and function of the interleukin 7 receptor in murine lymphocytes.

Abstract

A monoclonal antibody, A7R34, that recognizes the high-affinity interleukin 7 receptor (IL-7Ra) and blocks the binding between IL-7 and IL-7Ra has been produced. Cell surface staining with A7R34 demonstrated that IL-7Ra is expressed in both B- and T-cell lineages. In the bone marrow, immature B-lineage cells that do not express surface IgM were IL-7Ra+. In the thymus, IL-7Ra was detected in CD4-8- T cells and also in CD4 or CD8 single-positive cells but not in CD4+8+ double-positive cells. In the peripheral lymphoid tissues, both CD4 and CD8 single-positive cells were the major cell types that express IL-7Ra. Addition of A7R34 to a long-term B-precursor-cell culture inhibited proliferation of the B-lineage cells, indicating that IL-7 is an absolute requirement for in vitro B-cell genesis. Consistent with this in vitro result, continuous injection of A7R34 into an adult mouse resulted in a decrease of B-precursor cells and also of thymocytes, whereas a considerable fraction of mature B and T cells in the peripheral tissues persisted over 2 weeks of the experiment. When A7R34 injection is started from day 14 of gestation, it is possible to produce mice that lack B cells. These results indicate that IL-7 is an essential molecule for generation of both B and T cells in murine bone marrow and thymus, respectively. Moreover, IL-7Ra would be the sole receptor system regulating these processes.

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