Antiviral interferon response at single-cell resolution.

Area of Science:

• Immunology
• Virology
• Systems Biology

Background:

• Mammalian cells exhibit significant heterogeneity in their innate immune response to viral infections.
• Interferon induction and subsequent gene upregulation occur only in a subset of infected and exposed cells, respectively.

Purpose of the Study:

• To investigate the mechanisms by which the interferon response effectively controls viral spread despite single-cell heterogeneity.
• To elucidate the distinct roles of paracrine signaling and direct action on infected cells in antiviral defense.

Main Methods:

• Quantitative experimental studies of single-cell responses.
• Development and analysis of mathematical models simulating virus-interferon interactions.

Main Results:

• The interferon response effectively curbs viral spread through two key mechanisms: paracrine protection of uninfected cells and direct inhibition of viral replication in infected cells.
• Interferon action on infected cells is crucial for limiting virus replication rate, a mechanism exploited by some pathogenic viruses.
• Self-amplification of interferon production may calibrate the immune response to infection strength.

Conclusions:

• Interferons act as sentinels warning uninfected cells and as negative feedback regulators within infected cells to control viral spread.
• The timing of the interferon response relative to viral replication onset is critical for its efficacy in acute infections.