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Charakterisierung der immunregulatorischen Effekte der Zytokine IL-19, IL-20 und IL-24 auf die antigenspezifische CD8-T-Zell-Antwort

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106 S.
 
Veröffentlichung
2014-08-12
DOI
10.18725/OPARU-3431
Dissertation


Authors
Müller, Heike
Faculties
Medizinische Fakultät
License
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https://oparu.uni-ulm.de/xmlui/license_v3
Abstract
The function of the IL-10-related cytokines IL-19, IL-20, and IL-24 (IL-20-family of cytokines) is not well-studied. Here, IL20R2-/- mice were used to clarify the in vivo function of the IL-20-family of cytokines in CD8 T cell-dependent responses. Compared to B6 wild-type mice, the interrupted signaling of IL-19, IL-20, and IL-24 in IL20R2-/- mice significantly enhanced the de-novo-induction of antigen-specific CD8 T cells induced by vaccination with pCI/Ova or Ova/ODN1826/IFA. This demonstrates a clear effect of IL20R2 signaling in in vivo priming of CD8 T cells. The clinical outcome of this altered T cell response was analyzed in a T cell dependent inflammatory skin disease, the DTH. Here, IL20R2-/- mice were more sensitive in DTH response to Ova after vaccination compared to B6 wild-type mice. Thus, IL20R2 signaling in B6 mice has an immune suppressive effect in T cell dependent DTH regulation to Ova. The induction of DTH in IL20R2-deficient and wild-type OT I mice as well as the adoptive transfer of IL20R2-deficient and wild-type OT I CD8 T cells into wild-type hosts indicate that IL20R2 signaling inhibits CD8 T cell response not in a direct manner, but maybe via APC of the skin. In a second part of this work, the effect of the interrupted signal transduction of IL-19, IL-20, and IL-24 in IL20R2-/- mice were analyzed in the T cell dependent model of EAD. Primed preproinsulin-specific CD8 T cells lacking IL20R2 significantly enhanced EAD development in RIP-B7.1 mice compared to adoptively transferred preproinsulin-specific CD8 T cells of B6 wild-type mice. Accordingly, the EAD model confirms the down-regulatory effect of IL20R2-signaling in the priming phase of CD8 T cells. This work indicates that IL20R2 signals diminished antigen-specific CD8 T cell responses in an early phase and thus, the IL-20-family of cytokines affects the signaling network that down-modulates immune responses.
Date created
2013
Subject Headings
Cytokine [GND]
Antigens, CD8; Immunology [MeSH]
Cytokines [MeSH]
Receptors, antigen, T-cell; Immunology [MeSH]
Keywords
CD8 T cell; DTH; EAD; IL-19; IL-20; IL20R2; IL-24; Immunoregulation; Interleukin
Dewey Decimal Group
DDC 610 / Medicine & health

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Citation example

Müller, Heike (2014): Charakterisierung der immunregulatorischen Effekte der Zytokine IL-19, IL-20 und IL-24 auf die antigenspezifische CD8-T-Zell-Antwort. Open Access Repositorium der Universität Ulm. Dissertation. http://dx.doi.org/10.18725/OPARU-3431

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