Summary auto-generated
This study demonstrates that CpG oligodeoxynucleotides (CpG-ODN), synthetic immunostimulatory molecules, can effectively treat retrovirus-induced immunosuppression in mice. Using the Friend retrovirus (FV) mouse model, researchers treated infected mice with B-type CpG-ODN during acute infection and measured antibody responses to sheep red blood cells (SRBC). Mice receiving CpG-ODN showed significantly restored antibody production compared to control-treated infected mice. Mechanistic studies revealed that CD8+ T cells and interferon-gamma (IFN-γ) were essential for the protective effect. Depletion of CD8+ T cells abolished CpG-ODN protection, and neutralization of IFN-γ substantially reduced the therapeutic benefit. The protective effects were independent of viral load changes. These findings suggest that CpG-ODN may represent a promising therapeutic approach to counteract immunosuppression caused by retroviruses and other viral infections by enhancing CD8+ T-cell responses and IFN-γ production.
Key findings
- CpG-ODN treatment significantly restored antibody responses to SRBC in Friend virus-infected mice, reducing virus-induced immunosuppression
- CD8+ T cells were critical for CpG-ODN-mediated protection, as their depletion eliminated the therapeutic benefit
- Interferon-gamma (IFN-γ) production was essential for CpG-ODN protection against retrovirus-induced antibody suppression
- The protective mechanism was independent of viral load control, indicating IFN-γ and CD8+ T cells act through immunomodulatory rather than antiviral mechanisms
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Abstract
Most retroviruses induce severe immunosuppression during acute infection. We have used the Friend retrovirus mouse model to demonstrate that immunostimulatory B-type CpG oligodeoxynucleotides (ODN) have a protective effect against retrovirus-induced suppression of antibody responses to potent B-cell antigens. CD8+ T cells were critical for effective treatment with CpG-ODN, since in vivo depletion of these cells from treated mice impaired protection from retrovirus-induced immunosuppression. Protection also required IFN-γ, as neutralization of this cytokine abolished the therapeutic effect of CpG-ODN. These findings may have implications for the treatment of immunosuppressive virus infections.