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Gene expression analysis of thymocyte selection in vivo

Gene expression analysis of thymocyte selection in vivo Self versus non‐self discrimination is a key feature of immunorecognition. Through TCR‐activated apoptotic mechanisms, autoreactive thymocytes are purged at the CD4+CD8+ double‐positive (DP) precursor stage prior to maturation to CD4+ or CD8+ single‐positive (SP) thymocytes. To investigate this selection process in vivo, gene expression analysis by oligonucleotide array was performed in TCR transgenic mice. In total, 244 differentially expressed DP thymocyte genes induced or repressed by TCR triggering in vivo were identified. Genes involved in the biological processes of apoptosis, DNA recombination, antigen processing and adhesion are coordinately engaged. Moreover, analysis of gene expression in thymocyte subsets revealed that TCR ligand‐induced expression profiles vary according to their developmental stage, with 48 genes showing DP preference and nine showing SP thymocyte preference. Finally, our data suggest that both the extrinsic and the intrinsic apoptosis pathways are operating in thymic selection. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Immunology Oxford University Press

Gene expression analysis of thymocyte selection in vivo

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References (80)

Publisher
Oxford University Press
Copyright
The Japanese Society for Immunology
ISSN
0953-8178
eISSN
1460-2377
DOI
10.1093/intimm/dxg125
Publisher site
See Article on Publisher Site

Abstract

Self versus non‐self discrimination is a key feature of immunorecognition. Through TCR‐activated apoptotic mechanisms, autoreactive thymocytes are purged at the CD4+CD8+ double‐positive (DP) precursor stage prior to maturation to CD4+ or CD8+ single‐positive (SP) thymocytes. To investigate this selection process in vivo, gene expression analysis by oligonucleotide array was performed in TCR transgenic mice. In total, 244 differentially expressed DP thymocyte genes induced or repressed by TCR triggering in vivo were identified. Genes involved in the biological processes of apoptosis, DNA recombination, antigen processing and adhesion are coordinately engaged. Moreover, analysis of gene expression in thymocyte subsets revealed that TCR ligand‐induced expression profiles vary according to their developmental stage, with 48 genes showing DP preference and nine showing SP thymocyte preference. Finally, our data suggest that both the extrinsic and the intrinsic apoptosis pathways are operating in thymic selection.

Journal

International ImmunologyOxford University Press

Published: Oct 1, 2003

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