Regulatory T cells stimulate B7-H1 expression in myeloid-derived suppressor cells in ret melanomas
Myeloid-derived suppressor cells (MDSCs) are a heterogeneous population of cells, and they promote an immunosuppressive environment in tumor-bearing hosts. To characterize MDSCs in melanoma, we examined the expression of inhibitory B7 molecules by CD11b+Gr1+ cells isolated from mice with transplanta...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2012
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| In: |
The journal of investigative dermatology
Year: 2011, Jahrgang: 132, Heft: 4, Pages: 1239-1246 |
| ISSN: | 1523-1747 |
| DOI: | 10.1038/jid.2011.416 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1038/jid.2011.416 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0022202X15357055 
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| Verfasserangaben: | Taku Fujimura, Sabine Ring, Viktor Umansky, Karsten Mahnke and Alexander H. Enk |
| Zusammenfassung: | Myeloid-derived suppressor cells (MDSCs) are a heterogeneous population of cells, and they promote an immunosuppressive environment in tumor-bearing hosts. To characterize MDSCs in melanoma, we examined the expression of inhibitory B7 molecules by CD11b+Gr1+ cells isolated from mice with transplantable ret tumors. B7 molecules were expressed on CD11b+Gr1+ cells, which also expressed CD124 and inducible nitric oxide synthase, thus verifying their relation to MDSCs. In developing melanomas, CD11b+Gr1+ cells express only low levels of B7-H1. In contrast, B7-H1 is upregulated in large tumors, and functional analysis demonstrates that CD11b+Gr-1+ cells suppress the proliferation of CD4+ T cells through B7-H1. Depletion of regulatory T cells (Tregs) significantly downregulated the expression of B7-H1, B7-H3, and B7-H4 on MDSCs and reduced tumor growth, indicating a concerted immunosuppressive activity of Tregs and MDSCs. No differences in the suppressive function of MDSCs between CD25-depleted and non-depleted mice were recorded. Instead, tumor-derived MDSCs from Treg-depleted hosts produced less IL-10 and more IFN-γ as compared with Treg-harboring mice. These studies indicate that Tregs in tumors not only suppress effector T cells directly, but also modify the phenotype of tumor-infiltrating CD11b+ cells to express inhibitory B7-H molecules and to produce IL-10. |
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| Beschreibung: | Published online 22 December 2011 Gesehen am 04.06.2018 |
| Beschreibung: | Online Resource |
| ISSN: | 1523-1747 |
| DOI: | 10.1038/jid.2011.416 |