Engagement of the human pre-B cell receptor generates a lipid raft-dependent calcium signaling complex.

Pre-B cell receptor (pre-BCR) expression is critical for B lineage development. The signaling events initiated by the pre-BCR, however, remain poorly defined. We demonstrate that lipid rafts are the major functional compartment for human pre-B cell activation. A fraction of pre-BCR was constitutively raft associated, and receptor engagement enhanced this ...
association. These events promoted Lyn activation and Igbeta phosphorylation and led to the generation of a raft-associated signaling module composed of tyrosine phosphorylated Lyn, Syk, BLNK, PI3K, Btk, VAV, and PLCgamma2. Formation of this module was essential for pre-BCR calcium signaling. Together, these observations directly link the previously identified genetic requirement for the components of this module in B lineage development with theirfunctional role(s) in human preBCR signaling.
Mesh Terms:
B-Lymphocytes, Calcium, Cell Line, Cell Lineage, Humans, Immunoglobulin Light Chains, Lipids, Membrane Glycoproteins, Pre-B Cell Receptors, Receptors, Antigen, B-Cell, Signal Transduction
Immunity
Date: Aug. 01, 2000
Download Curated Data For This Publication
9061
Switch View:
  • Interactions 4