Journal
JOURNAL OF IMMUNOLOGY
Volume 195, Issue 10, Pages 4753-4759Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1501365
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Funding
- National Institutes of Health [R01-AI097590, T32CA009140]
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Despite their critical role in long-term immunity, the life span of individual memory B cells remains poorly defined. Using a tetracycline-regulated pulse-chase system, we measured population turnover rates and individual t(1/2) of pre-established Ag-induced Ig class-switched and IgM-positive memory B cells over 402 d. Our results indicate that, once established, both IgG-positive and less frequent IgM-positive memory populations are exceptionally stable, with little evidence of attrition or cellular turnover. Indeed, the vast majority of cells in both pools exhibited t1/2 that appear to exceed the life span of the mouse, contrasting dramatically with mature naive B cells. These results indicate that recall Ab responses are mediated by stable pools of extremely long-lived cells, and suggest that Ag-experienced B cells employ remarkably efficient survival mechanisms.
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