Requirement of phospholipase C-gamma 2 activation in surface immunoglobulin M-induced B cell apoptosis - PubMed (original) (raw)
Requirement of phospholipase C-gamma 2 activation in surface immunoglobulin M-induced B cell apoptosis
M Takata et al. J Exp Med. 1995.
Abstract
Surface IgM (sIgM) stimulation induces the tyrosine phosphorylation of multiple cellular substrates, including phospholipase C (PLC)-gamma 2, which is involved in the activation of phosphatidylinositol pathway. DT40 B cells underwent apoptotic cell death when activated through sIgM, a phenomenon that is related to elimination of self-reactive B cells. To examine the roles of PLC-gamma 2 in sIgM signaling, we have generated DT40 cells deficient in PLC-gamma 2 Cross-linking of sIgM on PLC-gamma 2-deficient cells evoked neither inositol 1,4,5-trisphosphate nor calcium mobilization. In PLC-gamma 2- or Syk-deficient DT40 cells, the induction of apoptosis was blocked, but was still observed in Lyn-deficient cells. Src homology 2 domains of PLC-gamma 2 were essential for both its activation and sIgM-induced apoptosis. Since tyrosine phosphorylation of PLC-gamma 2 is mediated by Syk, these results indicate that activation of PLC-gamma 2 through Syk is required for sIgM-induced apoptosis.
Comment in
- Connections between signal transduction components and cellular responses initiated by antigen receptor on B lymphocytes.
Scheuermann RH, Uhr JW. Scheuermann RH, et al. J Exp Med. 1995 Oct 1;182(4):903-6. doi: 10.1084/jem.182.4.903. J Exp Med. 1995. PMID: 7561692 Free PMC article. No abstract available.
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