TY  - JOUR
A1  - Uri, Anna
A1  - Werner, Sandra
A1  - Lühder, Fred
A1  - Hünig, Thomas
A1  - Kerkau, Thomas
A1  - Beyersdorf, Niklas
T1  - Protection of mice from acute graft-versus-host disease requires CD28 co-stimulation on donor CD4\(^{+}\) Foxp3\(^{+}\) regulatory T Cells
JF  - Frontiers in Immunology
N2  - Acute graft-versus-host disease (aGvHD) is a major cause of morbidity and mortality after allogeneic hematopoietic stem cell plus T cell transplantation (allo-HSCT). In this study, we investigated the requirement for CD28 co-stimulation of donor CD4\(^{+}\) conventional (CD4\(^{+}\)CD25\(^{-}\)Foxp3\(^{-}\), Tconv) and regulatory (CD4\(^{+}\)CD25\(^{+}\)Foxp3\(^{+}\), Treg) T cells in aGvHD using tamoxifen-inducible CD28 knockout (iCD28KO) or wild-type (wt) littermates as donors of CD4\(^{+}\) Tconv and Treg. In the highly inflammatory C57BL/6 into BALB/c allo-HSCT transplantation model, CD28 depletion on donor CD4\(^{+}\) Tconv reduced clinical signs of aGvHD, but did not significantly prolong survival of the recipient mice. Selective depletion of CD28 on donor Treg did not abrogate protection of recipient mice from aGvHD until about day 20 after allo-HSCT. Later, however, the pool of CD28-depleted Treg drastically declined as compared to wt Treg. Consequently, only wt, but not CD28-deficient, Treg were able to continuously suppress aGvHD and induce long-term survival of the recipient mice. To our knowledge, this is the first study that specifically evaluates the impact of CD28 expression on donor Treg in aGvHD. Moreover, the delayed kinetics of aGvHD lethality after transplantation of iCD28KO Treg provides a novel animal model for similar disease courses found in patients after allo-HSCT.
KW  - co-stimulation,
KW  - inducible deletion
KW  - regulatory T cells
KW  - acute graft-versus-host disease
KW  - CD28
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-158469
VL  - 8
IS  - 721
ER  - 
TY  - JOUR
A1  - Haack, Stephanie
A1  - Baiker, Sarah
A1  - Schlegel, Jan
A1  - Sauer, Markus
A1  - Sparwasser, Tim
A1  - Langenhorst, Daniela
A1  - Beyersdorf, Niklas
T1  - Superagonistic CD28 stimulation induces IFN‐γ release from mouse T helper 1 cells in vitro and in vivo
JF  - European Journal of Immunology
N2  - Like human Th1 cells, mouse Th1 cells also secrete IFN‐γ upon stimulation with a superagonistic anti‐CD28 monoclonal antibody (CD28‐SA). Crosslinking of the CD28‐SA via FcR and CD40‐CD40L interactions greatly increased IFN‐γ release. Our data stress the utility of the mouse as a model organism for immune responses in humans.
KW  - CD28
KW  - Th1 cells
KW  - cytokine release
KW  - interferon γ
KW  - Superagonistic antibody
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-239028
VL  - 51
IS  - 3
SP  - 738
EP  - 741
ER  -