Comparative Expression Profiling of Distinct T Cell Subsets Undergoing Oxidative Stress

  • The clinical outcome of adoptive T cell transfer-based immunotherapies is often limited due to different escape mechanisms established by tumors in order to evade the hosts' immune system. The establishment of an immunosuppressive micromilieu by tumor cells along with distinct subsets of tumor-infiltrating lymphocytes is often associated with oxidative stress that can affect antigen-specific memory/effector cytotoxic T cells thereby substantially reducing their frequency and functional activation. Therefore, protection of tumor-reactive cytotoxic T lymphocytes from oxidative stress may enhance the anti-tumor-directed immune response. In order to better define the key pathways/proteins involvThe clinical outcome of adoptive T cell transfer-based immunotherapies is often limited due to different escape mechanisms established by tumors in order to evade the hosts' immune system. The establishment of an immunosuppressive micromilieu by tumor cells along with distinct subsets of tumor-infiltrating lymphocytes is often associated with oxidative stress that can affect antigen-specific memory/effector cytotoxic T cells thereby substantially reducing their frequency and functional activation. Therefore, protection of tumor-reactive cytotoxic T lymphocytes from oxidative stress may enhance the anti-tumor-directed immune response. In order to better define the key pathways/proteins involved in the response to oxidative stress a comparative 2-DE-based proteome analysis of naïve CD45RA+ and their memory/effector CD45RO+ T cell counterparts in the presence and absence of low dose hydrogen peroxide (H2O2) was performed in this pilot study. Based on the profiling data of these T cell subpopulations under the various conditions, a series of differentially expressed spots were defined, members thereof identified by mass spectrometry and subsequently classified according to their cellular function and localization. Representative targets responding to oxidative stress including proteins involved in signaling pathways, in regulating the cellular redox status as well as in shaping/maintaining the structural cell integrity were independently verified at the transcript and protein level under the same conditions in both T cell subsets. In conclusion the resulting profiling data describe complex, oxidative stress-induced, but not strictly concordant changes within the respective expression profiles of CD45RA+ and CD45RO+ T cells. Some of the differentially expressed genes/proteins might be further exploited as potential targets toward modulating the redox capacity of the distinct lymphocyte subsets thereby providing the basis for further studies aiming at rendering them more resistant to tumor micromilieu-induced oxidative stress.show moreshow less

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Metadaten
Author:Rudolf Lichtenfels, Dimitrios Mougiakakos, C. Christian Johansson, Sven P. Dressler, Christian V. Recktenwald, Rolf Kiessling, Barbara Seliger
URN:urn:nbn:de:bvb:29-opus-37085
Title of the journal / compilation:PLoS ONE 7.7 (2012): 29.10.2012 <http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0041345>
Document Type:Article
Language:English
Date of Publication (online):2012/10/30
Publishing Institution:Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Release Date:2012/10/30
SWD-Keyword:-
Original publication:PLoS ONE 7.7 (2012): 29.10.2012 <http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0041345>
Institutes:Medizinische Fakultät -ohne weitere Spezifikation-
Dewey Decimal Classification:610 Medizin und Gesundheit
Collections:Open Access Artikel ohne Förderung 2012

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