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Wang, Y. et al.

Single and combined deletions of the NTAL/LAB and LAT adaptors minimally affect B-cell development and function.

NTAL (non-T-cell activation linker, also called LAB) and LAT (linker for activation of T cells) are evolutionarily related transmembrane adaptor proteins that are phosphorylated upon immunoreceptor engagement. Using quantitative reverse transcription-PCR, both NTAL and LAT were found to be expressed in B cells. However, LAT expression was limited to early B cells, whereas NTAL expression typified mature B cells. To delineate their roles in B-cell development and function, Ntal-deficient mice were generated and crossed with Lat-deficient mice. B cells developed in Lat(-/-) Ntal(-/-) double-deficient mice and in mice lacking either of the two adaptors with the same efficiency as in wild-type mice. Upon B-cell antigen receptor cross-linking, Ntal(-/-) B cells exhibited slightly increased Ca(2+) mobilization and proliferation. In addition, Ntal-deficient mice had increased levels of natural antibodies and slightly increased humoral response to a T-dependent antigen. Normal titers of serum-specific immunoglobulins were produced in response to a T-cell-independent antigen. Although NTAL is also expressed in plasma cells, its absence did not affect the hypergammaglobulinemia E and G1 that developed in mice with a mutation in tyrosine 136 of LAT. Therefore, NTAL does not play a role in B cells symmetric to the role played by LAT in T cells.[1]

References

Single and combined deletions of the NTAL/LAB and LAT adaptors minimally affect B-cell development and function. Wang, Y., Horvath, O., Hamm-Baarke, A., Richelme, M., Grégoire, C., Guinamard, R., Horejsi, V., Angelisova, P., Spicka, J., Schraven, B., Malissen, B., Malissen, M. Mol. Cell. Biol. (2005) [Pubmed]

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