Abstract
Chronic infection is difficult to overcome because of exhaustion or depletion of cytotoxic effector CD8+ T cells (cytotoxic T lymphoytes (CTLs)). Here we report that signaling via Toll-like receptors (TLRs) induced intrahepatic aggregates of myeloid cells that enabled the population expansion of CTLs (iMATEs: 'intrahepatic myeloid-cell aggregates for T cell population expansion') without causing immunopathology. In the liver, CTL proliferation was restricted to iMATEs that were composed of inflammatory monocyte–derived CD11b+ cells. Signaling via tumor-necrosis factor (TNF) caused iMATE formation that facilitated costimulation dependent on the receptor OX40 for expansion of the CTL population. The iMATEs arose during acute viral infection but were absent during chronic viral infection, yet they were still induced by TLR signaling. Such hepatic expansion of the CTL population controlled chronic viral infection of the liver after vaccination with DNA. Thus, iMATEs are dynamic structures that overcome regulatory cues that limit the population expansion of CTLs during chronic infection and can be used in new therapeutic vaccination strategies.
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Acknowledgements
We thank D. Kull, R. Hillermann, O. Seelbach, N. Simonavicius, M. Wolf and the flow cytometry core facility of the Institutes of Molecular Medicine and Experimental Immunology, University of Bonn for technical support. Supported by the Helmholtz Association (M.H.), the Hofschneider Foundation (M.H.), the European Research Council (LiverCancerMech; M.H.), the Helmholtz Alliance Preclinical Comprehensive Cancer Center (M.H.), Sonderforschungsbereich (36 to M.H., and 704, TR57 and 670 to P.K.), the Helmholtz Alliance on Immunotherapy of Cancer (P.K.), the Bundesministerium für Bildung und Forschung projects Virtual Liver and PeTra (P.K.) and the Excellence Cluster ImmunoSensation (P.K.).
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L.-R.H., D.W., F.R., R.-L.C., Z.A. and F.A.S. did the experiments; C.N.J. and P.K. designed and did intravital microscopy experiments; M.O. and H.-P.D. did electron microscopy studies; N.v.R., E.S., N.G. and M.C. contributed reagents and contributed to experimental design; C.K., U.P., M.H. and P.A.K. designed experiments; and L.-R.H., M.H. and P.A.K. wrote the manuscript.
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Supplementary information
Supplementary Text and Figures
Supplementary Figures 1–7 (PDF 3452 kb)
Supplementary Video 1
Hepatic microvasculature and uptake of TLR9-L by sinusoidal cells. (MOV 3412 kb)
Supplementary Video 2
Hepatic microvasculature and uptake of TLR9-L by sinusoidal cells. (MOV 4486 kb)
Supplementary Video 3
Circulating CD11b+ cells adhere in sinusoids after TLR9-L application. (MOV 6787 kb)
Supplementary Video 4
Circulating CD11b+ cells adhere in sinusoids after TLR9-L application. (MOV 4230 kb)
Supplementary Video 5
CD11b+ cells form non-perfused structures, iMATEs. (MOV 6593 kb)
Supplementary Video 6
CD11b+ cells form non-perfused structures, iMATEs. (MOV 5457 kb)
Supplementary Video 7
CD11b+ cells form non-perfused structures, iMATEs. (MOV 1295 kb)
Supplementary Video 8
CD11b+ cells form non-perfused structures, iMATEs. (MOV 4833 kb)
Supplementary Video 9
CD8+ T cells migrate slowly within iMATEs. (MOV 11059 kb)
Supplementary Video 10
3D structures of iMATEs. (MOV 3268 kb)
Supplementary Video 11
3D structures of iMATEs. (MOV 3577 kb)
Supplementary Video 12
3D structures of iMATEs. (MOV 5917 kb)
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Huang, LR., Wohlleber, D., Reisinger, F. et al. Intrahepatic myeloid-cell aggregates enable local proliferation of CD8+ T cells and successful immunotherapy against chronic viral liver infection. Nat Immunol 14, 574–583 (2013). https://doi.org/10.1038/ni.2573
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DOI: https://doi.org/10.1038/ni.2573
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