ICOS ligand costimulation is required for T-cell encephalitogenicity

RA Sporici, RL Beswick, C von Allmen, CA Rumbley… - Clinical …, 2001 - Elsevier
The interaction of ICOS with its ligand on APC provides a costimulatory signal to previously
activated T-cells. In these studies, we blocked the ICOS: ICOS ligand interaction with ICOS-
Ig during the in vitro activation of MBP-reactive transgenic CD4+ T-cells. The presence of
ICOS-Ig in these cultures inhibited the ability of the transgenic T-cells to transfer EAE,
although they entered the brains of the recipient mice. ICOS-Ig increased apoptosis in the
transgenic T-cells, especially in the memory population. This enhanced apoptosis was …