Regulation of cell survival during B lymphopoiesis: increased pre-B cell apoptosis in CD24-transgenic mouse bone marrow |
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Authors: | Lu L Chappel M S Humphries R K Osmond D G |
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Institution: | Department of Anatomy and Cell Biology, McGill University, Montreal, Canada. |
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Abstract: | CD24 (heat-stable antigen) is expressed in a developmentally regulated fashion by B cell precursors in mouse bone marrow (BM), but its role in B lymphopoiesis remains obscure. A slight overexpression of CD24 in transgenic (Tg) mice leads to depletion of B lymphoid cells in BM. The present study examines whether CD24 is involved in apoptotic selection of B lineage cells under normal microenvironmental conditions in vivo. Double immunofluorescence labeling and flow cytometry have been used to quantitate the apoptotic rates of phenotypically defined B cell populations in BM of CD24-Tg mice. Apoptosis of pre-B cells expressing cytoplasmic mu heavy chains of IgM but lacking surface (s)IgM was increased both ex vivo and in short-term culture, while the number of pre-B cells was halved compared to BM of normal mice. In contrast, B220+mu- pro-B cells and sIgM+ B lymphocytes showed no significant change in either apoptosis or number. The findings provide evidence that CD24 can play a role in vivo in modulating pre-B cell apoptosis, a quality control checkpoint in B cell development. |
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