Cord blood derived CD4+ CD25(high) T cells become functional regulatory T cells upon antigen encounter.
BACKGROUND: Upon antigen exposure, cord blood derived T cells respond to ubiquitous environmental antigens by high proliferation. To date it remains unclear whether these "excessive" responses relate to different regulatory properties of the putative T regulatory cell (Treg) compartment or...
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doaj-74087efaf12742d8bc2482dc97a072682020-11-25T02:28:43ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0171e2935510.1371/journal.pone.0029355Cord blood derived CD4+ CD25(high) T cells become functional regulatory T cells upon antigen encounter.Elisabeth MayerChristina BannertSaskia GruberSven KlunkerAndreas SpittlerCezmi A AkdisZsolt SzépfalusiThomas EiweggerBACKGROUND: Upon antigen exposure, cord blood derived T cells respond to ubiquitous environmental antigens by high proliferation. To date it remains unclear whether these "excessive" responses relate to different regulatory properties of the putative T regulatory cell (Treg) compartment or even expansion of the Treg compartment itself. METHODS: Cord blood (>37 week of gestation) and peripheral blood (healthy controls) were obtained and different Treg cell subsets were isolated. The suppressive potential of Treg populations after antigen exposure was evaluated via functional inhibition assays ([(3)H]thymidine incorporation assay and CFSE staining) with or without allergen stimulation. The frequency and markers of CD4(+)CD25(high)FoxP3(+) T cells were characterized by mRNA analysis and flow cytometry. RESULTS: Cord blood derived CD4(+)CD25(high) cells did not show substantial suppressor capacity upon TCR activation, in contrast to CD4(+)CD25(high) cells freshly purified from adult blood. This could not be explained by a lower frequency of FoxP3(+)CD4(+)CD25(high)cells or FOXP3 mRNA expression. However, after antigen-specific stimulation in vitro, these cells showed strong proliferation and expansion and gained potent suppressive properties. The efficiency of their suppressive capacity can be enhanced in the presence of endotoxins. If T-cells were sorted according to their CD127 expression, a tiny subset of Treg cells (CD4(+)CD25(+)CD127(low)) is highly suppressive even without prior antigen exposure. CONCLUSION: Cord blood harbors a very small subset of CD4(+)CD25(high) Treg cells that requires antigen-stimulation to show expansion and become functional suppressive Tregs.http://europepmc.org/articles/PMC3260151?pdf=render |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Elisabeth Mayer Christina Bannert Saskia Gruber Sven Klunker Andreas Spittler Cezmi A Akdis Zsolt Szépfalusi Thomas Eiwegger |
spellingShingle |
Elisabeth Mayer Christina Bannert Saskia Gruber Sven Klunker Andreas Spittler Cezmi A Akdis Zsolt Szépfalusi Thomas Eiwegger Cord blood derived CD4+ CD25(high) T cells become functional regulatory T cells upon antigen encounter. PLoS ONE |
author_facet |
Elisabeth Mayer Christina Bannert Saskia Gruber Sven Klunker Andreas Spittler Cezmi A Akdis Zsolt Szépfalusi Thomas Eiwegger |
author_sort |
Elisabeth Mayer |
title |
Cord blood derived CD4+ CD25(high) T cells become functional regulatory T cells upon antigen encounter. |
title_short |
Cord blood derived CD4+ CD25(high) T cells become functional regulatory T cells upon antigen encounter. |
title_full |
Cord blood derived CD4+ CD25(high) T cells become functional regulatory T cells upon antigen encounter. |
title_fullStr |
Cord blood derived CD4+ CD25(high) T cells become functional regulatory T cells upon antigen encounter. |
title_full_unstemmed |
Cord blood derived CD4+ CD25(high) T cells become functional regulatory T cells upon antigen encounter. |
title_sort |
cord blood derived cd4+ cd25(high) t cells become functional regulatory t cells upon antigen encounter. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS ONE |
issn |
1932-6203 |
publishDate |
2012-01-01 |
description |
BACKGROUND: Upon antigen exposure, cord blood derived T cells respond to ubiquitous environmental antigens by high proliferation. To date it remains unclear whether these "excessive" responses relate to different regulatory properties of the putative T regulatory cell (Treg) compartment or even expansion of the Treg compartment itself. METHODS: Cord blood (>37 week of gestation) and peripheral blood (healthy controls) were obtained and different Treg cell subsets were isolated. The suppressive potential of Treg populations after antigen exposure was evaluated via functional inhibition assays ([(3)H]thymidine incorporation assay and CFSE staining) with or without allergen stimulation. The frequency and markers of CD4(+)CD25(high)FoxP3(+) T cells were characterized by mRNA analysis and flow cytometry. RESULTS: Cord blood derived CD4(+)CD25(high) cells did not show substantial suppressor capacity upon TCR activation, in contrast to CD4(+)CD25(high) cells freshly purified from adult blood. This could not be explained by a lower frequency of FoxP3(+)CD4(+)CD25(high)cells or FOXP3 mRNA expression. However, after antigen-specific stimulation in vitro, these cells showed strong proliferation and expansion and gained potent suppressive properties. The efficiency of their suppressive capacity can be enhanced in the presence of endotoxins. If T-cells were sorted according to their CD127 expression, a tiny subset of Treg cells (CD4(+)CD25(+)CD127(low)) is highly suppressive even without prior antigen exposure. CONCLUSION: Cord blood harbors a very small subset of CD4(+)CD25(high) Treg cells that requires antigen-stimulation to show expansion and become functional suppressive Tregs. |
url |
http://europepmc.org/articles/PMC3260151?pdf=render |
work_keys_str_mv |
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