Abstract
Peripheral tolerance is essential for immunological homeostasis. Tolerant T cells are thought to arise after T cell receptor ligation in conditions that are nonpermissive for replication. Here we have investigated the function of the cell cycle inhibitor p27Kip1 in tolerance induction in vivo using naive T cell receptor–transgenic cells lacking the cyclin-dependent kinase (Cdk)–binding domain of p27Kip1(p27Δ). Wild-type but not p27Δ cells underwent tolerization. Tolerized wild-type cells had impaired Cdk2 and Cdc2 kinase activity and failed to phosphorylate the checkpoint inhibitor Smad3, leading to enhanced expression of the Cdk inhibitor p15. In contrast, p27Δ cells proliferated in tolerizing conditions because of Cdk kinase activation and phosphorylation of Smad3, which resulted in no upregulation of p15. Smad3 'knockdown' prevented tolerance induction, whereas expression of a Smad3 mutant resistant to Cdk-mediated phosphorylation recapitulated molecular and functional events of tolerance. Thus, p27Kip1 is required during induction of tolerance and Smad3 regulates T cell responses 'downstream' of p27Kip1.
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Acknowledgements
We thank F. Liu (Rutgers, New Brunswick, New Jersey) for providing the antibody specific for Smad phosphorylated at S212 and Smad3-Tm; J. Daley and S. Lazo (Dana-Farber Cancer Institute) for assistance with cell sorting; and G.J. Freeman and L.J. Appleman (Dana-Farber Cancer Institute) for discussions and critical reading of the manuscript. Supported by the US National Institutes of Health (AI 46548, CA104596 and AI 043552).
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L.L. did in vivo immunization, adoptive cell transfer, in vitro cell culture, signaling studies, immunoblot analysis, transcription assays, preparation of plasmids, transfection and flow cytometry, and prepared the first draft of the manuscript; Y.I. was responsible for mouse breeding and maintenance of the colonies, immunization, adoptive cell transfer, in vitro cell culture, immunoblot analysis and flow cytometry; A.B. provided technical support for mouse breeding and maintenance of the colonies, in vitro cell culture, signaling studies and flow cytometry; V.A.B. coordinated all steps of the project, supervised L.L, Y.I and A.B., and was responsible for preparation of the manuscript.
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Supplementary information
Supplementary Fig. 1
DO11.10 T cells from DO11.10 and DO11.10p27Δ mice were stimulated with various concentrations of OVA(323–339) peptide in the presence of irradiated antigen presenting cells and proliferation was assessed on d3 of culture. (PDF 25 kb)
Supplementary Fig. 2
For the intracellular IL-2 staining, CD4+ T cells were harvested from primed or tolerized recipients on day fifteen after immunization and restimulated in vitro with OVA(323–339) in the presence of antigen presenting cells for 24 hours. (PDF 27 kb)
Supplementary Fig. 3
Downregulation of Smad3 expression by shRNA. (PDF 38 kb)
Supplementary Fig. 4
Transfection efficiency. (PDF 46 kb)
Supplementary Fig. 5
DO11.10 and DO11.10p27ΔT cells were adoptively transferred into syngeneic recipients that were subsequently treated with immunizing (priming) stimulus, and cells were then purified and activation of cyclin E was examined as described in Figure 3. (PDF 45 kb)
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Li, L., Iwamoto, Y., Berezovskaya, A. et al. A pathway regulated by cell cycle inhibitor p27Kip1 and checkpoint inhibitor Smad3 is involved in the induction of T cell tolerance. Nat Immunol 7, 1157–1165 (2006). https://doi.org/10.1038/ni1398
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DOI: https://doi.org/10.1038/ni1398
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