alexa Bcl10 is a positive regulator of antigen receptor-induced activation of NF-kappaB and neural tube closure.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Ruland J, Duncan GS, Elia A, del Barco Barrantes I, Nguyen L,

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Abstract Bcl10, a CARD-containing protein identified from the t(1;14)(p22;q32) breakpoint in MALT lymphomas, has been shown to induce apoptosis and activate NF-kappaB in vitro. We show that one-third of bcl10-/- embryos developed exencephaly, leading to embryonic lethality. Surprisingly, bcl10-/- cells retained susceptibility to various apoptotic stimuli in vivo and in vitro. However, surviving bcl10-/- mice were severely immunodeficient and bcl10-/- lymphocytes are defective in antigen receptor or PMA/Ionomycin-induced activation. Early tyrosine phosphorylation, MAPK and AP-1 activation, and Ca2+ signaling were normal in mutant lymphocytes, but antigen receptor-induced NF-kappaB activation was absent. Thus, Bcl10 functions as a positive regulator of lymphocyte proliferation that specifically connects antigen receptor signaling in B and T cells to NF-kappaB activation.
This article was published in Cell and referenced in Journal of Clinical & Cellular Immunology

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