Virus immunocapture provides evidence of CD8 lymphocyte-derived HIV-1 in vivo
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Updated: Jul 13, 2026
A Technique to Simultaneously Visualize Virus-Specific CD8+ T Cells and Virus-Infected Cells In situ
Published on: August 13, 2009
Gareth J Hughes1, Samantha J Willey, Alexandra Cochrane
1Centre for Infectious Diseases, University of Edinburgh, Summerhall, Edinburgh, UK. gareth.hughes@ed.ac.uk
Insights
This study shows that Human Immunodeficiency Virus type 1 (HIV-1) can be released from infected CD8 T cells, contributing significantly to viral load. Up to 15% of plasma HIV-1 may originate from these CD8 lymphocytes.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- CD8 T cells play a crucial role in immune responses.
- The contribution of CD8 T cells to Human Immunodeficiency Virus type 1 (HIV-1) replication and pathogenesis is not fully understood.
- Understanding viral reservoirs is key to managing HIV-1 infection.
Purpose of the Study:
- To develop and validate a method for specifically capturing HIV-1 virions originating from CD8 T cells.
- To quantify the proportion of plasma HIV-1 derived from CD8 lymphocytes in infected individuals.
Main Methods:
- Developed a novel immunocapture assay utilizing antibodies against host-derived proteins (CD8, CD3, CD36) on viral envelopes.
- Employed quantitative reverse transcriptase-polymerase chain reaction (RT-qPCR) to measure captured HIV-1 levels.
- Utilized in vitro models with purified CD8 T cells and CD3+CD8- T cells to confirm assay specificity.
Main Results:
- The in vitro model confirmed that CD8 incorporation into virions is specific to CD8 T cell infection.
- Anti-CD8 immunocapture revealed that up to 15% (range 10-33%) of plasma HIV-1 in infected individuals originates from CD8 lymphocytes.
- CD8-derived virus levels showed a strong correlation with plasma viral load.
Conclusions:
- HIV-1-infected CD8 T cells are a significant source of circulating virus.
- The substantial contribution of CD8 T cells to viral load may exacerbate immune dysfunction and accelerate AIDS progression.
- These findings highlight CD8 T cells as a potential target for HIV-1 therapeutic strategies.
Objectives:
To demonstrate that HIV-1 immunocapture with an antibody against CD8 specifically captures virions derived from infected CD8 T cells, and to determine the proportion of HIV-1 derived from CD8 lymphocytes in plasma samples from HIV-infected individuals.
Methods:
A virus capture method was developed to enable the detection of HIV-1 virions based upon the presence of certain cell-specific host-derived proteins (CD8, CD3, CD36) within the viral envelope. HIV-1 virions were captured using antibodies against these proteins and levels of bound virus were determined by quantitative reverse transcriptase-polymerase chain reaction. Highly pure CD8 and CD3+CD8- T-cell cultures were used as in-vitro models to determine the specificity of the virus capture technique.
Results:
The in-vitro model demonstrates that incorporation of the CD8 molecule into released virions is specific to infection of CD8 T cells. Levels of HIV-1 immunocaptured from plasma of infected individuals using the anti-CD8 antibody indicate that up to 15% (range 10-33) of the plasma viral load is derived from CD8 lymphocytes.
Conclusion:
This study demonstrates for the first time that HIV-1-infected CD8 T cells can contribute substantially to levels of circulating virus during the course of infection. Levels of CD8-derived virus did not correlate with the level of infection of circulating CD8 T cells, but do show a significantly good fit to plasma viral loads based on a power model. The extensive infection of CD8 T cells implied by these results may contribute towards immune dysfunction and disease progression to AIDS.
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