[Interferons: between structure and function]

Area of Science:

• Immunology
• Virology
• Molecular Biology

Background:

• Interferons (IFNs) are proteins produced by cells in response to viral infections.
• Three main types of IFNs exist: Type I (IFN-α, IFN-β, etc.), Type II (IFN-γ), and Type III (IFN-λ).
• Each IFN type binds to specific receptors on target cells, initiating antiviral signaling cascades.

Purpose of the Study:

• To review the classification and antiviral mechanisms of interferons.
• To highlight the role of different interferon types in antiviral defense.
• To explain the molecular pathways activated by interferons.

Main Methods:

• Classification of interferons based on genetic, structural, and receptor-binding properties.
• Description of interferon-induced signaling pathways, including JAK/STAT.
• Analysis of the downstream antiviral effectors and cellular processes modulated by interferons.

Main Results:

• Type I (IFN-α, IFN-β) and Type III (IFN-λ) interferons provide significant antiviral protection.
• Interferon binding to receptors activates JAK/STAT and other pathways.
• Activated pathways induce antiviral agents (PKR, 2-5A, Mx proteins) and apoptotic pathways, inhibiting viral replication.

Conclusions:

• Interferons are key mediators of the innate and adaptive immune response against viral infections.
• Interferon signaling effectively blocks viral entry, replication, and assembly within host cells.
• Understanding interferon function is crucial for developing antiviral therapies.