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J. Exp. Med.,
Volume 188, Number 11, December 7, 1998 1993-2005
By
From the Department of Pathology and Program in Immunology and Virology, University of
Massachusetts Medical School, Worcester, Massachusetts 01655
Numerous studies have examined T cell receptor (TCR) usage of selected virus-specific T cell
clones, yet little information is available regarding the stability and diversity of TCR repertoire usage during viral infections. Here, we analyzed the V
8.1 TCR repertoire directly ex vivo by
complementarity-determining region 3 (CDR3) length spectratyping throughout the acute
lymphocytic choriomeningitis virus (LCMV) infection, into memory, and under conditions of
T cell clonal exhaustion. The V
8 population represented 30-35% of the LCMV-induced
CD8+ T cells and included T cells recognizing several LCMV-encoded peptides, allowing for
a comprehensive study of a multiclonal T cell response against a complex antigen. Genetically
identical mice generated remarkably different T cell responses, as reflected by different spectratypes and different TCR sequences in same sized spectratype bands; however, a conserved
CDR3 motif was found within some same sized bands. This indicated that meaningful studies on the evolution of the T cell repertoire required longitudinal studies within individual mice.
Such longitudinal studies with peripheral blood lymphocyte samples showed that (a) the virus-induced T cell repertoire changes little during the apoptosis period after clearance of the viral
antigens; (b) the LCMV infection dramatically skews the host T cell repertoire in the memory
state; and (c) continuous selection of the T cell repertoire occurs under conditions of persistent
infections.
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