@article{HaackBaikerSchlegeletal.2021, author = {Haack, Stephanie and Baiker, Sarah and Schlegel, Jan and Sauer, Markus and Sparwasser, Tim and Langenhorst, Daniela and Beyersdorf, Niklas}, title = {Superagonistic CD28 stimulation induces IFN-γ release from mouse T helper 1 cells in vitro and in vivo}, series = {European Journal of Immunology}, volume = {51}, journal = {European Journal of Immunology}, number = {3}, doi = {10.1002/eji.202048803}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-239028}, pages = {738 -- 741}, year = {2021}, abstract = {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.}, language = {en} } @article{EderHollmannMandasarietal.2022, author = {Eder, Sascha and Hollmann, Claudia and Mandasari, Putri and Wittmann, Pia and Schumacher, Fabian and Kleuser, Burkhard and Fink, Julian and Seibel, J{\"u}rgen and Schneider-Schaulies, J{\"u}rgen and Stigloher, Christian and Beyersdorf, Niklas and Dembski, Sofia}, title = {Synthesis and characterization of ceramide-containing liposomes as membrane models for different T cell subpopulations}, series = {Journal of Functional Biomaterials}, volume = {13}, journal = {Journal of Functional Biomaterials}, number = {3}, issn = {2079-4983}, doi = {10.3390/jfb13030111}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-286130}, year = {2022}, abstract = {A fine balance of regulatory (T\(_{reg}\)) and conventional CD4\(^+\) T cells (T\(_{conv}\)) is required to prevent harmful immune responses, while at the same time ensuring the development of protective immunity against pathogens. As for many cellular processes, sphingolipid metabolism also crucially modulates the T\(_{reg}\)/T\(_{conv}\) balance. However, our understanding of how sphingolipid metabolism is involved in T cell biology is still evolving and a better characterization of the tools at hand is required to advance the field. Therefore, we established a reductionist liposomal membrane model system to imitate the plasma membrane of mouse T\(_{reg}\) and T\(_{conv}\) with regards to their ceramide content. We found that the capacity of membranes to incorporate externally added azide-functionalized ceramide positively correlated with the ceramide content of the liposomes. Moreover, we studied the impact of the different liposomal preparations on primary mouse splenocytes in vitro. The addition of liposomes to resting, but not activated, splenocytes maintained viability with liposomes containing high amounts of C\(_{16}\)-ceramide being most efficient. Our data thus suggest that differences in ceramide post-incorporation into T\(_{reg}\) and T\(_{conv}\) reflect differences in the ceramide content of cellular membranes.}, language = {en} }