1. In the absence of its cytosolic domain, the CD28 molecule still contributes to T cell activation.
- Author
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Morin, Stéphanie, Giroux, Valentin, Favre, Cédric, Bechah, Yassina, Auphan-Anezin, Nathalie, Roncagalli, Romain, Mège, Jean-Louis, Olive, Daniel, Malissen, Marie, and Nunès, Jacques
- Subjects
T cells ,LYMPHOCYTES ,LEUCOCYTES ,CELL-mediated lympholysis ,CYTOLOGY - Abstract
The CD28 costimulatory receptor has a pivotal role in T cell biology as this molecule amplifies T cell receptor (TCR) signals to provide an efficient immune T cell response. There is a large debate about how CD28 mediates these signals. Here, we designed a CD28 gene-targeted knock-in mouse strain lacking the cytoplasmic tail of CD28. As is the case in CD28-deficient (CD28 knock-out) mice, regulatory T cell homeostasis and T cell activation are altered in these CD28 knock-in mice. Unexpectedly, the presence of a CD28 molecule deprived of its cytoplasmic tail could partially induce some early activation events in T cells such as signaling events or expression of early activation markers. These results unravel a new mechanism of T cell costimulation by CD28, independent of its cytoplasmic tail. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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