Superimposed Epitopes Restricted by the Same HLA Molecule Drive Distinct HIV-Specific CD8+ T Cell Repertoires
Superimposed Epitopes Restricted by the Same HLA Molecule Drive Distinct HIV-Specific CD8+ T Cell Repertoires
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受相同 HLA 分子限制的叠加表位驱动不同的 HIV 特异性 CD8 T 细胞库
作者:
Xiaoming Sun;M. Fujiwara;Yi Shi;N. Kuse;H. Gatanaga;V. Appay;G. Gao;S. Oka;M. Takiguchi
Superimposed epitopes, in which a shorter epitope is embedded within a longer one, can be presented by the same HLA class I molecule. CD8+ CTL responses against such epitopes and the contribution of this phenomenon to immune control are poorly characterized. In this study, we examined HLA-A*24:02–restricted CTLs specific for the superimposed HIV Nef epitopes RYPLTFGWCF (RF10) and RYPLTFGW (RW8). Unexpectedly, RF10-specific and RW8-specific CTLs from HIV-1–infected HLA-A*24:02+ individuals had no overlapping Ag reactivity or clonotypic compositions. Single-cell TCR sequence analyses demonstrated that RF10-specific T cells had a more diverse TCR repertoire than did RW8-specific T cells. Furthermore, RF10-specific CTLs presented a higher Ag sensitivity and HIV suppressive capacity compared with RW8-specific CTLs. Crystallographic analyses revealed important structural differences between RF10– and RW8–HLA-A*24:02 complexes as well, with featured and featureless conformations, respectively, providing an explanation for the induction of distinct T cell responses against these epitopes. The present study shows that a single viral sequence containing superimposed epitopes restricted by the same HLA molecule could elicit distinct CD8+ T cell responses, therefore enhancing the control of HIV replication. This study also showed that a featured epitope (e.g., RF10) could drive the induction of T cells with high TCR diversity and affinity.
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DOI:
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发表时间:
1992
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Zemmour,J;Little,AM;Schendel,DJ;Parham,P
通讯作者:
Parham,P
影响因子:
4.4
作者:
Takamiya,Y;Schönbach,C;Nokihara,K;Yamaguchi,M;Ferrone,S;Kano,K;Egawa,K;Takiguchi,M
通讯作者:
Takiguchi,M
DOI:
--
发表时间:
1992
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Tanabe,M;Sekimata,M;Ferrone,S;Takiguchi,M
通讯作者:
Takiguchi,M
影响因子:
32.4
作者:
Ladell, Kristin;Hashimoto, Masao;Appay, Victor
通讯作者:
Appay, Victor
影响因子:
20.3
作者:
Robins, Harlan S.;Campregher, Paulo V.;Carlson, Christopher S.
通讯作者:
Carlson, Christopher S.