BCR‐induced superoxide negatively regulates B‐cell proliferation and T‐cell‐independent type 2 Ab responses |
| |
Authors: | Sabrina M Richards Edward A Clark |
| |
Institution: | 1. Department of Immunology, University of Washington, Seattle, WA, USA;2. Department of Microbiology, University of Washington, Seattle, WA, USA |
| |
Abstract: | Superoxide and its derivatives have been implicated as secondary messenger molecules that influence signaling cascades in non‐phagocytes. B lymphocytes produce superoxide after BCR ligation. We found that these ROS regulate B‐cell signaling and entry into the cell cycle. B cells from mice deficient in the gp91phox subunit of the NADPH oxidase complex are unable to generate ROS after BCR ligation. However, after BCR stimulation, more gp91phox KO B cells enter the G1 stage of the cell cycle and proliferate than WT B cells. BCR ligation leads to a more rapid decrease in p27Kip1 levels in gp91phox KO B cells. Gp91phox KO mice display enhanced T‐cell‐independent type 2, but normal T‐dependent Ab responses. ROS‐dependent regulation of BCR‐induced proliferation may help modulate the size of the humoral response to T‐cell‐independent type 2 Ag immunization. |
| |
Keywords: | B‐cell Ag receptor Cell cycle ROS |
|
|