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Cross linking of the IgE receptor (FcεRI) on mast cells plays a critical role in IgE-dependent allergy including allergic rhinitis, asthma, anaphylaxis, and delayed type hypersensitivity reactions. The Ca 2+  activated K +  channel, KCa3.1, plays a critical role in IgE-stimulated Ca 2+  entry and degranulation in mast cells by helping to maintain a negative membrane potential, which provides an electrochemical gradient to drive Ca 2+  influx. Of the 3 classes of PI3K, the class II PI3Ks are the least studied and little is known about the roles for class II PI3Ks  in vivo  in the context of the whole organism under normal and pathological conditions. Studying bone marrow derived mast cells (BMMC) isolated from  PI3KC2β   -/-   mice, we now show that the class II PI3KC2β is critical for FcεRI stimulated KCa3.1 channel activation and the subsequent activation of mast cells. We found FcεRI-stimulated Ca 2+  entry, cytokine production, and degranulation are decreased in BMMC isolated from  PI3KC2β   -/-   mice. In addition,  PI3KC2β   -/-   mice are markedly resistant to both passive cutaneous and passive systemic anaphylaxis. These findings identify PI3KC2β as a new pharmacologic target to treat IgE-mediated disease.

Phosphatidlyinositol-3-kinase C2 beta (PI3KC2β) is a potential new target to treat IgE mediated disease