Immunodominant HIV-1-specific HLA-B- and HLA-C-restricted CD8+ T cells do not differ in polyfunctionality

Area of Science:

• Immunology
• Virology
• Genetics

Background:

• Human Immunodeficiency Virus type 1 (HIV-1) specific CD8+ T cell responses vary in effectiveness based on HLA restriction.
• Understanding the factors influencing these differences is crucial for developing effective HIV-1 therapies.

Purpose of the Study:

• To investigate the frequency and polyfunctionality of HLA-B-restricted versus HLA-C-restricted CD8+ T cell responses in HIV-1 infection.
• To analyze the association between T cell polyfunctionality, CD4+ T cell counts, and epitope sequence variation.

Main Methods:

• Flow cytometry was used to assess the polyfunctionality (IFN-gamma, TNF-alpha, IL-2, MIP-1beta, CD107a) of immunodominant HLA-B*57/B5801- and HLA-Cw*07-restricted CD8+ T cells.
• Sequence variation in targeted epitopes was analyzed concurrently in nine HIV-1 infected subjects.

Main Results:

• No significant difference in polyfunctionality was observed between HLA-B*57/5801- and HLA-Cw*07-restricted CD8+ T cells.
• Higher polyfunctionality correlated positively with CD4+ T cell counts, while monofunctional CD8+ T cells correlated inversely.
• Epitope sequence variation did not significantly impact CD8+ T cell polyfunctionality.

Conclusions:

• Loss of CD8+ T cell polyfunctionality and increase in monofunctional cells are associated with HIV-1 disease progression, independent of the restricting HLA allele.
• Sequence variation in epitopes does not appear to be a major driver of altered CD8+ T cell polyfunctionality in chronic HIV-1 infection.