The Journal of Experimental Medicine
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Published 15 April 2002. doi:10.1084/jem.20010809
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© Rockefeller University Press, 0022-1007/2002/4/991/ $5.00
The Journal of Experimental Medicine, Volume 195, Number 8, April 15, 2002 991-1001

Predominant Role of T Cell Receptor (TCR)-{alpha} Chain in Forming Preimmune TCR Repertoire Revealed by Clonal TCR Reconstitution System

Tadashi Yokosuka1,2, Kan Takase1, Misao Suzuki4, Yohko Nakagawa5, Shinsuke Taki1, Hidemi Takahashi5, Takehiko Fujisawa2, Hisashi Arase1 and Takashi Saito1,3

1 Department of Molecular Genetics, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan
2 Department of Thoracic Surgery, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan
3 Cell Signaling Team, RIKEN Research Center for Allergy and Immunology, Kanagawa 230-0045, Japan
4 Center for Animal Resources and Development, Kumamoto University, Kumamoto 860-0811, Japan
5 Department of Microbiology and Immunology, Nippon Medical School, Tokyo 113-8602, Japan

Address correspondence to T. Saito, Dept. of Molecular Genetics, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan. Phone: 81-43-226-2197; Fax: 81-43-222-1791; E-mail: saito{at}med.m.chiba-u.ac.jp

The CDR3 regions of T cell receptor (TCR)-{alpha} and -ß chains play central roles in the recognition of antigen (Ag)-MHC complex. TCR repertoire is created on the basis of Ag recognition specificity by CDR3s. To analyze the potential spectrum of TCR-{alpha} and -ß to exhibit Ag specificity and generate TCR repertoire, we established hundreds of TCR transfectants bearing a single TCR-{alpha} or -ß chain derived from a cytotoxic T cell (CTL) clone, RT-1, specific for HIVgp160 peptide, and randomly picked up TCR-ß or -{alpha} chains. Surprisingly, one-third of such TCR-ß containing random CDR3ß from naive T cells of normal mice could reconstitute the antigen-reactive TCR coupling with RT-1 TCR-{alpha}. A similar dominant function of TCR-{alpha} in forming Ag-specific TCR, though low-frequency, was obtained for lymphocytic choriomeningitis virus–specific TCR. Subsequently, we generated TCR-{alpha} and/or -ß transgenic (Tg) mice specific for HIVgp160 peptide, and analyzed the TCR repertoire of Ag-specific CTLs. Similar to the results from TCR reconstitution, TCR-{alpha} Tg generated CTLs with heterogeneous TCR-ß, whereas TCR-ß Tg-induced CTLs bearing a single TCR-{alpha}. These findings of Ag recognition with minimum involvement of CDR3ß expand our understanding regarding the flexibility of the spectrum of TCR and suggest a predominant role of TCR-{alpha} chain in determining the preimmune repertoire of Ag-specific TCR.

Key Words: antigen recognition • CDR3 • CTL • HIV gp160 • selection


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