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Published on: March 8, 2012
HIV-1 epitope-specific CD8+ T cell responses strongly associated with delayed disease progression cross-recognize
Emma L Turnbull1, A Ross Lopes, Nicola A Jones
1The Edward Jenner Institute for Vaccine Research, Compton, Berkshire, United Kingdom.
Journal of Immunology (Baltimore, Md. : 1950)
|May 4, 2006
Summary
HIV-1 specific CD8(+) T cell responses that recognize viral variants are linked to slower disease progression. The quality of T cell receptor usage, not breadth, influences this cross-recognition and control of HIV-1.
Area of Science:
- Immunology
- Virology
- Genetics
Background:
- HIV-1 sequence variation challenges T cell control.
- HLA class I alleles influence HIV-1 infection prognosis.
- Understanding T cell epitope recognition is key to managing HIV-1.
Purpose of the Study:
- To investigate the functional cross-reactivity of CD8(+) T cell responses to HIV-1 epitopes.
- To correlate epitope variant recognition with disease progression rates.
- To explore the role of T cell receptor (TCR) usage in HIV-1 control.
Main Methods:
- Studied CD8(+) T cell responses to HIV-1 epitopes restricted by specific HLA class I alleles.
- Assessed functional cross-reactivity against epitope variants.
- Analyzed TCR usage patterns in HIV-1-infected individuals.
Main Results:
- Efficient cross-recognition of epitope variants strongly correlated with delayed HIV-1 disease progression.
- The quality of T cell responses to specific epitopes, not just HLA type, impacts disease control.
- Dominant TCR usage, particularly TCR Vbeta families, explained interpatient variability in cross-reactivity.
Conclusions:
- The ability of HIV-1 specific CD8(+) T cells to recognize viral variants is crucial for controlling viral replication.
- TCR properties, rather than clonal breadth, determine the flexibility of T cell responses.
- Findings may inform the design of effective HIV-1 vaccines targeting T cell immunity.
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