Abstract
Most recently, we have described the G-protein coupled receptor 83 (GPR83), which is highly expressed by CD4+CD25+ regulatory T cells (Tregs) to be involved in the induction of CD4+Foxp3+ Tregs in the course of an ongoing immune response. Four GPR83 isoforms have been described. Here, we have shown that GPR83 isoform-4, which differs from GPR83 isoform-1 by 20 additional aminoacids in the second cytoplasmatic loop, is predominantly expressed by Tregs. Interestingly, GPR83 isoform-4 but not GPR83 isoform-1 retrovirally transduced T cells were able to interfere with inflammatory responses in vivo. Re-analysis of GPR83 transduced T cells revealed that this in vivo acquisition of suppressive activity was associated with the induction of Treg-associated molecules including Foxp3 in GPR83 isoform-4 but not GPR83 isoform-1 transduced CD4+ T cells under inflammatory conditions. Our results suggest that the 20 additional aminoacids within GPR83 isoform-4 are involved in Treg induction during inflammatory immune responses.
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Acknowledgements
We are very grateful to Carolin Wevers for excellent technical assistance and Lothar Groebe, Witold Bartosik and Annika Frede for cell sorting.
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Hansen, W., Westendorf, A., Toepfer, T. et al. Inflammation in vivo is modulated by GPR83 isoform-4 but not GPR83 isoform-1 expression in regulatory T cells. Genes Immun 11, 357–361 (2010). https://doi.org/10.1038/gene.2010.5
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DOI: https://doi.org/10.1038/gene.2010.5
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