Author/Authors :
Shilling، نويسنده , , Rebecca A. and Clay، نويسنده , , Bryan S. and Tesciuba، نويسنده , , Amanda G. and Berry، نويسنده , , Elizabeth L. and Lu، نويسنده , , Tiffany and Moore، نويسنده , , Tamson V. and Bandukwala، نويسنده , , Hozefa S. and Tong، نويسنده , , Jiankun and Weinstock، نويسنده , , Joel V. and Flavell، نويسنده , , Richard A. and Horan، نويسنده , , Tom and Yoshinaga، نويسنده , , Steve K. and Welcher، نويسنده , , Andrew A. and Cannon، نويسنده , , Judy L. and Sperling، نويسنده , , Anne I.، نويسنده ,
Abstract :
Previous work has shown ICOS can function independently of CD28, but whether either molecule can compensate for the other in vivo is not known. Since ICOS is a potent inducer of Th2 cytokines and linked to allergy and elevated serum IgE in humans, we hypothesized that augmenting ICOS costimulation in murine allergic airway disease may overcome CD28 deficiency. While ICOS was expressed on T cells from CD28−/− mice, Th2-mediated airway inflammation was not induced in CD28−/− mice by increased ICOS costimulation. Further, we determined if augmenting CD28 costimulation could compensate for ICOS deficiency. ICOS−/− mice had a defect in airway eosinophilia that was not overcome by augmenting CD28 costimulation. CD28 costimulation also did not fully compensate for ICOS for antibody responses, germinal center formation or the development of follicular B helper T cells. CD28 and ICOS play complementary non-overlapping roles in the development of Th2 immunity in vivo.
Keywords :
Costimulation , Follicular B helper T cells , Rodent , asthma , antibodies , allergy , ICOS , Th2 cells , CD28
