Jones DD, Wilmore JR, Allman D. Cellular Dynamics of Memory B Cell Populations: IgM+ and IgG+ Memory B Cells Persist Indefinitely as Quiescent Cells.
THE JOURNAL OF IMMUNOLOGY 2015;
195:4753-9. [PMID:
26438523 DOI:
10.4049/jimmunol.1501365]
[Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 09/14/2015] [Indexed: 11/19/2022]
Abstract
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 t1/2 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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