HLA-E-restricted HIV-1-specific CD8+ T cell responses in natural infection

Area of Science:

• Immunology
• Virology
• Genetics

Background:

• Nonclassical Human Leukocyte Antigen-E (HLA-E) restricted CD8+ T cell responses are protective in SIV models.
• The role of HLA-E restricted CD8+ T cell responses in HIV-1 infection is not well understood.

Purpose of the Study:

• To investigate the biological relevance of HLA-E restricted CD8+ T cell responses in HIV-1 infection.
• To analyze CD8+ T cell responses to HIV-1 Gag peptides presented by HLA-E.

Main Methods:

• In vitro assays using T cell lines from HIV-infected patients and healthy donors.
• Analysis of HLA-E restricted T cell responses to Gag-KL9 and Gag-KF11 epitopes.
• Blocking assays using B7 signal peptide.
• Ex vivo analyses of CD8+ T cell responses in HIV-infected individuals.

Main Results:

• Observed HLA-E restricted T cell responses to Gag-KL9 and Gag-KF11 epitopes.
• Blocking HLA-E/KF11 binding decreased CD8+ T cell responses.
• HIV-infected cells presenting KF11 via HLA-E were recognized by CD8+ T cells.
• Bulk CD8+ T cells from HIV-infected individuals recognized infected cells via HLA-E.
• Higher responder frequency for HLA-E restricted responses to KF11 compared to KL9.

Conclusions:

• Demonstrated HLA-E restricted HIV-specific immune responses.
• Findings suggest HLA-E restricted responses may influence CD8+ T cell immunodominance in HIV infection.
• These results offer potentially paradigm-shifting insights into HIV immunity.