| First Author | Tortola L | Year | 2010 |
| Journal | Blood | Volume | 116 |
| Issue | 24 | Pages | 5200-7 |
| PubMed ID | 20826721 | Mgi Jnum | J:167415 |
| Mgi Id | MGI:4868185 | Doi | 10.1182/blood-2010-05-284547 |
| Citation | Tortola L, et al. (2010) IL-21 induces death of marginal zone B cells during chronic inflammation. Blood 116(24):5200-7 |
| abstractText | Interleukin-2 (IL-2) and IL-21 share activities in the control of T- and B-cell maturation, proliferation, function, and survival. However, opposing roles for IL-2 and IL-21 have been reported in the development of regulatory T cells. To dissect unique, redundant, and opposing activities of IL-2 and IL-21, we compared T- and B-cell development and function in mice lacking both IL-2 receptor alpha (IL-2Ralpha) and IL-21R (double knockouts [DKO]) with single knockout and wild-type (WT) mice. Similarly to il2ra(-/-) mice, DKO showed reduced numbers of regulatory T cells and, consequently, hyper-activation and proliferation of T cells associated with inflammatory disease (ie, colitis), weight loss, and reduced survival. The absence of IL-2Ralpha resulted in overproduction of IL-21 by IFN-gamma-producing CD4(+) T cells, which induced apoptosis of marginal zone (MZ) B cells. Hence, MZ B cells and MZ B-cell immunoglobulin M antibody responses to Streptococcus pneumoniae phosophorylcholine were absent in il2ra(-/-) mice but were completely restored in DKO mice. Our results highlight key roles of IL-2 in inhibiting IL-21 production by CD4(+) T cells and of IL-21 in negatively regulating MZ B-cell survival and antibody production. |
