Abstract
Thymocyte selection and differentiation requires extracellular signal–regulated kinase (Erk) signaling, but transcription factor substrates of Erk in thymocytes are unknown. We have characterized the function of SAP-1 (Elk4), an Erk-regulated transcription factor, in thymocyte development. Early thymocyte development was normal, but single-positive thymocyte and peripheral T cell numbers were reduced, reflecting a T cell–autonomous defect. T cell receptor–induced activation of SAP-1 target genes such as Egr1 was substantially impaired in double-positive thymocytes, although Erk activation was normal. Analysis of T cell receptor transgenes showed that positive selection was reduced by 80–90% in SAP-1-deficient mice; heterozygous mice showed a moderate defect. Negative selection was unimpaired. SAP-1 thus directly links Erk signaling to the transcriptional events required for thymocyte positive selection.
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Acknowledgements
We thank F. Batista, D. Cantrell, C. Dickson, M. Owen, C. Reis e Sousa, K. Weston and R. Zamoyska for discussions and/or comments on the manuscript. We thank W. Heath (Walter and Eliza Hall Institute, Melbourne, Australia) for the OT-II transgenic mice; A. Smith for the targeting vector; Cancer Research UK Biological Resources Unit for animal husbandry; and D. Davies, G. Warne and C. Simpson of the London Research Institute FACS facility for cell sorting and technical support. Supported by Cancer Research UK.
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Costello, P., Nicolas, R., Watanabe, Y. et al. Ternary complex factor SAP-1 is required for Erk-mediated thymocyte positive selection. Nat Immunol 5, 289–298 (2004). https://doi.org/10.1038/ni1038
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DOI: https://doi.org/10.1038/ni1038
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