BCR-induced superoxide negatively regulates B-cell proliferation and T-cell-independent type 2 Ab responses

✍ Scribed by Sabrina M. Richards; Edward A. Clark

• Book ID: 102166930
• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 343 KB
• Volume: 39
• Category: Article
• ISSN: 0014-2980
• DOI: 10.1002/eji.200939587

✦ Synopsis

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 gp91^phox^ subunit of the NADPH oxidase complex are unable to generate ROS after BCR ligation. However, after BCR stimulation, more gp91^phox^ 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 p27^Kip1^ levels in gp91^phox^ KO B cells. Gp91^phox^ 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.