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Adaptor proteins have important functions in coupling stimulation through immunoreceptors with downstream events. The adaptor linker for activation of B cells (LAB)/non-T cell activation linker (NTAL) is expressed in various immune cell types and has a similar domain structure as linker for activation of T cells (LAT). In this study we generated a LAB transgenic mouse to compare the functional differences between LAB and LAT. A LAB transgene expressed in LAT-deficient T cells was able to restore T cell development. However, these mice developed severe organomegaly with disorganized lymphoid tissues. Lymphocytes from these transgenic mice were hyperactivated, and T cells produced large amounts of type II cytokines. In addition, these activities appeared to be uncoupled from the TCR. An examination of the signaling capabilities of these T cells revealed that LAB resembled a LAT molecule unable to bind phospholipase C-gamma1.

Linker for Activation of B Cells: A Functional Equivalent of a Mutant Linker for Activation of T Cells Deficient in Phospholipase C-γ1 Binding