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B-2 cells are a subtype of B cell. They form part of the adaptive immune response and mediate humoral immunity. B 2 cells can produce high-affinity antibodies and generate immunological memory. B-2 cells are often used synonymously with classical B cells.
IL-7R activation drives early B cell development, but the signalling is unclear. Here the authors show PLCγ is involved in IL-7R-induced mTOR activation via a DAG/PKC-dependent pathway, and that double deficiency of the two PLCγ isoforms arrests B cell development at the pre-pro-B stage in mice.
Ikaros deletions are associated with certain human malignancies. Georgopoulos and colleagues show that loss of Ikaros arrests B lymphoid progenitors at an adherent and proliferative pre-B cell stage from which leukemia can arise.
Membrane immunoglobulin E (IgE) on germinal-center-like B cells, without engagement of IgE, uses the CD19-PI3K-Akt-IRF4 axis and the BLNK-Jnk-p38 axis, with the former used for plasma-cell differentiation and the latter used for apoptotic death.