LAB: a new membrane-associated adaptor molecule in B cell activation.

Erin Janssen, Minghua Zhu, Weijia Zhang, Surapong Koonpaew, Weiguo Zhang

Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA.

Nature immunology 2003 Feb

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The adaptor molecule, linker for activation of T cells (LAT), is essential in T cell activation and development; a similar molecule in B cells has not yet been identified. Here, we report the identification of a new adaptor protein, linker for activation of B cells (LAB). Like LAT, LAB was localized to lipid rafts. Upon activation via the B cell receptor (BCR), LAB was phosphorylated and interacted with the adaptor protein Grb2. Decreased LAB expression led to a reduction in BCR-mediated calcium flux and Erk activation. LAB rescued thymocyte development but not normal T cell activation in LAT(-/-) mice. Our data suggest that LAB links BCR engagement to downstream signaling pathways.

Citation

Erin Janssen, Minghua Zhu, Weijia Zhang, Surapong Koonpaew, Weiguo Zhang. LAB: a new membrane-associated adaptor molecule in B cell activation. Nature immunology. 2003 Feb;4(2):117-23