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Tumor-dependent resistance of rat peritoneal macrophages to herpes simplex virus
Abstract:
By their position at sites of initial infection and their wide distribution in major organs of the body, macrophages may be decisive in determining the susceptibility or resistance of the host to virus infection. Macrophage restriction of virus replication has been shown to be closely related to virus strains or virus types and to the age of the infected host. We report the effects of the development of a solid tumor in rats on intrinsic in vitro macrophage activity against herpes simplex virus type 1. The results obtained with the infectious center assays and the analysis of single-cycle growth curves of herpes simplex virus type 1 in macrophages obtained from normal and tumor-bearing rats showed a depression of antiviral activity of macrophages from tumor-bearing rats. The possibility of immunomodulation by bacterial adjuvants on tumor-bearing rats and the effects on the antiviral activity of peritoneal macrophages were furthermore demonstrated.
Insights
Solid tumors in rats impair macrophage antiviral activity against herpes simplex virus type 1. Bacterial adjuvants may restore this immune function in tumor-bearing hosts.
Area of Science:
- Immunology
- Virology
- Oncology
Background:
- Macrophages are crucial immune cells at infection sites, influencing host susceptibility to viral infections.
- Macrophage antiviral activity is known to be affected by virus type and host age.
Purpose of the Study:
- To investigate the impact of solid tumor development on the intrinsic antiviral activity of macrophages against herpes simplex virus type 1 (HSV-1).
- To explore the potential of immunomodulation using bacterial adjuvants to restore macrophage antiviral function in tumor-bearing rats.
Main Methods:
- Infectious center assays were performed.
- Single-cycle growth curves of HSV-1 were analyzed in macrophages from normal and tumor-bearing rats.
- The effects of bacterial adjuvants on peritoneal macrophages from tumor-bearing rats were assessed.
Main Results:
- Macrophages from tumor-bearing rats exhibited depressed antiviral activity against HSV-1 compared to those from normal rats.
- Immunomodulation with bacterial adjuvants demonstrated a positive effect on the antiviral activity of peritoneal macrophages in tumor-bearing rats.
Conclusions:
- Solid tumor development significantly impairs macrophage intrinsic antiviral activity against HSV-1.
- Bacterial adjuvants show potential for restoring macrophage antiviral functions in the context of cancer.