| First Author | Miller AT | Year | 2007 |
| Journal | Nat Immunol | Volume | 8 |
| Issue | 5 | Pages | 514-21 |
| PubMed ID | 17417640 | Mgi Jnum | J:122418 |
| Mgi Id | MGI:3714252 | Doi | 10.1038/ni1458 |
| Citation | Miller AT, et al. (2007) Production of Ins(1,3,4,5)P4 mediated by the kinase Itpkb inhibits store-operated calcium channels and regulates B cell selection and activation. Nat Immunol 8(5):514-21 |
| abstractText | Antigen receptor-mediated production of inositol-1,4,5-trisphosphate (Ins(1,4,5)P3) in lymphocytes triggers the release of Ca2+ from intracellular stores; this release of Ca2+ results in the opening of store-operated Ca2+ channels in the plasma membrane. Here we report that mice lacking Ins(1,4,5)P3 3-kinase B (Itpkb), which converts Ins(1,4,5)P3 to inositol-1,3,4,5-tetrakisphosphate (Ins(1,3,4,5)P4), had impaired B lymphocyte development and defective immunoglobulin G3 antibody responses to a T lymphocyte-independent antigen. Itpkb-deficient B lymphocytes had the phenotypic and functional features of tolerant B lymphocytes and showed enhanced activity of store-operated Ca2+ channels after B lymphocyte receptor stimulation, which was reversed by the provision of exogenous Ins(1,3,4,5)P4. Our data identify Itpkb and its product Ins(1,3,4,5)P4 as inhibitors of store-operated Ca2+ channels and crucial regulators of B cell selection and activation. |
