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CD45 links the B cell receptor with cell survival and is required for the persistence of germinal centers

Abstract

To segregate the many contributions that B cell receptor (BCR)–mediated signals make to immune responses, we have analyzed here B cells deficient in the 'pan-leukocyte' marker CD45. BCR ligation of Cd45−/− B cells failed to activate phosphatidylinositol-3-OH kinase, NF-κB, Erk1 or Erk2 kinases or to upregulate cell survival proteins and instead induced apoptosis. Immunization of Cd45−/− B cell chimeras induced germinal centers and antigen-specific immunoglobulin G1 antibody-forming cells early, but both cellular compartments decreased by day 14. Proliferation of Cd45−/− B cells induced by CD40 ligand in vitro was impaired as a result of abrogation by BCR ligation of the upregulation of prosurvival proteins. In contrast, enforced expression of the antiapoptotic factor Bcl-xL prevented the collapse of Cd45−/− B cell germinal centers. These results show mechanistic differences in B cell survival during germinal center initiation and propagation; CD40 signaling is sufficient for the former, whereas the latter requires signaling from the BCR.

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Figure 1: Cellular responses after BCR ligation of Cd45−/− B cells.
Figure 2: CD45-null B cells respond normally to growth factors, have normal frequency of NP-reactive BCRs and efficiently present antigen.
Figure 3: B cell chimeras.
Figure 4: Reduced NP-IgG1+ AFC generation in the absence of CD45.
Figure 5: Premature dissolution of germinal centers and NP+IgG1+ cells in Cd45−/− B cell chimeras.
Figure 6: BCR ligation of Cd45−/− B cells inhibits CD40L-mediated proliferation and results in enhanced apoptosis in vitro.
Figure 7: Enforced expression of Bcl-xL permits Cd45−/− B cells to maintain T cell–dependent responses.

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Acknowledgements

We thank V. Tybulewicz (National Institute for Medical Research, Mill Hill, UK) for Cd45−/− mice17; K. Rajewsky (Center for Blood Research, Harvard Medical School, Cambridge, Massachusetts) for Cd19−/− mice26 and μMt mice23; D. Huang, G. Belz, J. Silke, L. O'Reilly (The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia) and F. Mackay (Garvan Institute of Medical Research, Sydney, Australia) for reagents and advice; and B. Mckenzie and S. Holroyd for technical assistance. Supported by the National Health and Medical; Research Council Australia and the Cancer Council of Victoria.

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Correspondence to David M Tarlinton.

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Supplementary information

Supplementary Fig. 1

General characteristics of exon 12 Cd45−/− B cells. (PDF 171 kb)

Supplementary Fig. 2

CD45-null BCR signaling. (PDF 107 kb)

Supplementary Fig. 3

Enforced expression of Bcl-xL does not alter CD45-null B cell anti-NP response at day 7. (PDF 113 kb)

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Huntington, N., Xu, Y., Puthalakath, H. et al. CD45 links the B cell receptor with cell survival and is required for the persistence of germinal centers. Nat Immunol 7, 190–198 (2006). https://doi.org/10.1038/ni1292

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