The clonal composition of a peptide-specific oligoclonal CTL repertoire selected in response to persistent EBV infection is stable over time - PubMed (original) (raw)
. 1998 Jul 15;161(2):594-601.
Affiliations
- PMID: 9670932
The clonal composition of a peptide-specific oligoclonal CTL repertoire selected in response to persistent EBV infection is stable over time
V Levitsky et al. J Immunol. 1998.
Abstract
The TCR repertoire of a peptide-specific HLA A11-restricted CTL response to persistent infection with EBV was followed for a period of 57 mo. Sequencing of TCR V alpha and V beta chains and alanine scanning mutagenesis analysis of 83 CTL clones isolated in five reactivation experiments demonstrated that this repertoire is composed of at least four distinct CTL clonotypes that are constantly reactivated from donor's blood and express structurally heterogeneous TCRs. Target cell recognition and CD8 blocking experiments indicate that the four clonotypes possess different avidity and TCR affinity for the specific Ag. This demonstrates that at least in some individuals a heterogeneous peptide-specific memory CTL repertoire selected by a persistent Ag can be remarkably stable in time and accommodate a range of TCR affinities and T cell avidities. Our results suggest that competition for the specific Ag may be not the major force driving the maintenance of memory CTLs and that the nature of the first antigenic challenge may largely determine the clonal composition of memory.
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