International Immunology Advance Access originally published online on September 6, 2004
International Immunology 2004 16(11):1549-1559; doi:10.1093/intimm/dxh156
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© 2004 The Japanese Society for Immunology
In vivo selection of a TCR Vß repertoire directed against an immunodominant influenza virus CTL epitope
Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Department of Medicine, Harvard Medical School, Boston, MA, USA
Correspondence to: W. Zhong; E-mail: weimin_zhong{at}dfci.harvard.edu
Correspondence to: E. Reinherz; E-mail: ellis_reinherz{at}dfci.harvard.edu
Little is known about the mechanisms governing TCR repertoire selection in response to foreign antigens. Here, we evaluate the molecular features of the murine C57BL/6 (B6) TCR Vß repertoire directed at the NP366374 immunodominant epitope of the influenza virus nucleoprotein. Common or public ß chains are shared among individuals following either primary or secondary infection. Importantly, repertoire diversity decreases substantially after a second viral exposure due to enrichment of TCRs sharing Vß CDR3 loops of identical length and highly related amino acid sequences. TCRs from these secondary T cell populations possess greater overall avidity for the NP366374/Db complex compared to those from the primary repertoire. Thus, expansion of CD8+ T cells expressing a favored germline Vß gene segment in the primary response and further selection for CDR3ß loops during the secondary response, contribute to optimization of immune recognition against certain viral epitopes.
Keywords: influenza virus, repertoire, T cell receptor, vaccination
Transmitting editor: S. Koyasu
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