In vivo selection of a TCR Vbeta repertoire directed against an immunodominant influenza virus CTL epitope - PubMed (original) (raw)

. 2004 Nov;16(11):1549-59.

doi: 10.1093/intimm/dxh156. Epub 2004 Sep 6.

Affiliations

• PMID: 15351787
• DOI: 10.1093/intimm/dxh156

In vivo selection of a TCR Vbeta repertoire directed against an immunodominant influenza virus CTL epitope

Weimin Zhong et al. Int Immunol. 2004 Nov.

Abstract

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 Vbeta repertoire directed at the NP(366-374) immunodominant epitope of the influenza virus nucleoprotein. Common or 'public' beta 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 Vbeta CDR3 loops of identical length and highly related amino acid sequences. TCRs from these secondary T cell populations possess greater overall avidity for the NP(366-374)/D(b) complex compared to those from the primary repertoire. Thus, expansion of CD8(+) T cells expressing a favored germline Vbeta gene segment in the primary response and further selection for CDR3beta loops during the secondary response, contribute to optimization of immune recognition against certain viral epitopes.

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