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Differential Inhibitory Receptor Expression on T Cells Delineates Functional Capacities in Chronic Viral Infection.

Jeffrey E Teigler1,2, Gennadiy Zelinskyy3, Michael A Eller1,2

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|September 15, 2017
PubMed
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Inhibitory receptors on CD4 T cells vary by function in HIV infection. Blocking these receptors, like CTLA-4, can enhance immune control of viral replication.

Keywords:
CD4 T cellsCTLA-4HIVPD-1inhibitory receptors

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Area of Science:

  • Immunology
  • Virology
  • Cellular Biology

Background:

  • Inhibitory receptors regulate immune responses, crucial in chronic infections and cancer.
  • Blocking inhibitory receptors like PD-1 and CTLA-4 enhances CD8 T cell activity in HIV.
  • The role of inhibitory receptors on CD4 T cells in chronic HIV infection is not well understood.

Purpose of the Study:

  • To determine and compare inhibitory receptor expression on HIV-specific CD4 T cells.
  • To analyze the relationship between inhibitory receptor expression and CD4 T cell functionality.
  • To investigate the impact of blocking specific inhibitory receptors on immune responses and viral control.

Main Methods:

  • Flow cytometry to assess expression of inhibitory receptors (2B4, CTLA-4, LAG-3, PD-1, Tim-3) on virus-specific CD4 and CD8 T cells.
  • Functional assays measuring cytokine production (IFN-γ, TNF-α, IL-2, CD40L) following staphylococcal enterotoxin B stimulation and receptor blockade.
  • Viral replication control assessment in a Friend retrovirus infection model following CTLA-4 blockade.

Main Results:

  • Inhibitory receptor distribution varied significantly among different cytokine-producing CD4 T cell subsets.
  • Gamma interferon (IFN-γ)-producing cells showed the highest prevalence, while TNF-α-producing cells showed the lowest.
  • CTLA-4 blockade increased IFN-γ and CD40L production; PD-1 blockade augmented IFN-γ, IL-2, and TNF-α production.
  • CTLA-4 blockade improved viral replication control in a Friend retrovirus model.

Conclusions:

  • Inhibitory receptor expression on HIV-specific CD4 T cells is functionally dependent.
  • Differential blockade of inhibitory receptors offers potential for immune modulation in HIV therapy and vaccination.
  • Targeting specific inhibitory receptors may represent a novel immunotherapeutic strategy for chronic viral infections.