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Immunity. 2000 Aug;13(2):243-53.

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

Author information

1
The Molecular Biology Institute, University of California, Los Angeles 90095, USA.

Abstract

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.

PMID:
10981967
DOI:
10.1016/s1074-7613(00)00024-8
[Indexed for MEDLINE]
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