Abstract
Lineage choice is of great interest in developmental biology. In the immune system, the αβ and γδ lineages of T lymphocytes diverge during the course of the β-, γ- and δ-chain rearrangement of T-cell receptor (TCR) genes that takes place within the same precursor cell and which results in the formation of the γδTCR or pre-TCR proteins1,2,3. The pre-TCR consists of the TCRβ chain covalently linked to the pre-TCRα protein, which is present in immature but not in mature T cells which instead express the TCRα chain4,5. Animals deficient in pre-TCRα have few αβ lineage cells but an increased number of γδ T cells. These γδ T cells exhibit more extensive TCRβ rearrangement than γδ T cells from wild-type mice6,7. These observations are consistent with the idea that different signals emanating from the γδTCR and pre-TCR instruct lineage commitment8. Here we show, by using confocal microscopy and biochemistry to analyse the initiation of signalling, that the pre-TCR but not the γδTCR colocalizes with the p56lck Src kinase into glycolipid-enriched membrane domains (rafts) apparently without any need for ligation. This results in the phosphorylation of CD3ε and Zap-70 signal transducing molecules. The results indicate clear differences between pre-TCR and γδTCR signalling.
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Acknowledgements
We thank C. Amirand for advice in quantitative colocalization analysis; J. Feinberg, C. Garcia and I. Aifantis for help in thymocyte analysis; E. Barbier for advice on biochemistry; P. Pereira for γδTCR transgenic mice; and Y. Goureau for assistance in confocal microscopy. We thank E. D. Smith for help with the artwork and L. Holcomb for preparation of the manuscript. H.v.B. is supported by the Koerber Foundation (Germany). F.G. is a recipient of a Biotech grant from European Community.
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Saint-Ruf, C., Panigada, M., Azogui, O. et al. Different initiation of pre-TCR and γδTCR signalling. Nature 406, 524–527 (2000). https://doi.org/10.1038/35020093
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DOI: https://doi.org/10.1038/35020093
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