| Autor: |
Budde ML; Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison, WI, USA., Greene JM, Chin EN, Ericsen AJ, Scarlotta M, Cain BT, Pham NH, Becker EA, Harris M, Weinfurter JT, O'Connor SL, Piatak M Jr, Lifson JD, Gostick E, Price DA, Friedrich TC, O'Connor DH |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of virology [J Virol] 2012 Jul; Vol. 86 (14), pp. 7596-604. Date of Electronic Publication: 2012 May 09. |
| DOI: |
10.1128/JVI.00716-12 |
| Abstrakt: |
Specific major histocompatibility complex (MHC) class I alleles are associated with an increased frequency of spontaneous control of human and simian immunodeficiency viruses (HIV and SIV). The mechanism of control is thought to involve MHC class I-restricted CD8(+) T cells, but it is not clear whether particular CD8(+) T cell responses or a broad repertoire of epitope-specific CD8(+) T cell populations (termed T cell breadth) are principally responsible for mediating immunologic control. To test the hypothesis that heterozygous macaques control SIV replication as a function of superior T cell breadth, we infected MHC-homozygous and MHC-heterozygous cynomolgus macaques with the pathogenic virus SIVmac239. As measured by a gamma interferon enzyme-linked immunosorbent spot assay (IFN-γ ELISPOT) using blood, T cell breadth did not differ significantly between homozygotes and heterozygotes. Surprisingly, macaques that controlled SIV replication, regardless of their MHC zygosity, shared durable T cell responses against similar regions of Nef. While the limited genetic variability in these animals prevents us from making generalizations about the importance of Nef-specific T cell responses in controlling HIV, these results suggest that the T cell-mediated control of virus replication that we observed is more likely the consequence of targeting specificity rather than T cell breadth. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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