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Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037
In aged mice the population of mature peripheral B cells is maintained despite a severalfold decrease in the population of bone marrow B cell progenitors. The analysis of the rate of accumulation of 5'-bromo-2-deoxyuridine (BrdU)-labeled splenic B cells in mice fed BrdU for 8 days to 8 wk demonstrated a severalfold increase in the half-life of mature B cells in aged mice. Consistent with a role for decreased B cell turnover in maintaining the mature B cell population of aged mice, several findings indicate that fewer newly generated B cells enter the spleen from the bone marrow in aged vs young adult mice. These include 1) a fourfold decrease in the population of relatively immature splenic B cells, defined as cells that express high levels of heat-stable Ag and accumulate BrdU within 8 wk of labeling; and 2) an equivalent decrease in the population of bone marrow cells representative of later stages of B cell maturation (sIgD-sIgMint-high). Surprisingly, despite a four- to sixfold decrease in pre-B cells, the population of least mature bone marrow B cells (IgD-sIgMvery low) remains intact. Because this population accumulates BrdU-labeled cells more slowly in aged mice than in younger mice, and bone marrow B cells at more mature developmental stages are diminished, it appears that in aged mice B cell development beyond the sIgMvery low stage may be retarded and that cells, therefore, accumulate within this population.
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