Type I interferon: understanding its role in HIV pathogenesis and therapy

Area of Science:

• Immunology
• Virology
• Infectious Diseases

Background:

• Type I interferons (IFN-Is) are crucial innate immune mediators with a debated role in Human Immunodeficiency Virus (HIV) infection.
• IFN-Is are implicated in both controlling HIV replication and causing immunologic damage, particularly in acute and chronic stages.

Purpose of the Study:

• To review the historical context and current understanding of IFN-I's role in HIV infection.
• To explore the sources, effects, and therapeutic implications of IFN-I signaling in HIV and SIV infection.

Main Methods:

• Review of existing literature on IFN-I, HIV, and SIV.
• Analysis of data from nonhuman primate studies regarding IFN-I signaling in acute infection.
• Examination of interventional studies involving IFN-I modulation in chronic HIV/SIV infection.

Main Results:

• IFN-Is, primarily from plasmacytoid dendritic cells (pDCs), activate NK cells and upregulate HIV restriction factors during acute infection.
• In chronic infection, IFN-Is may contribute to CD4 T cell loss and immune exhaustion, with pDC populations declining.
• Interventional studies on IFN-I signaling in chronic ART-suppressed HIV infection have yielded mixed but potentially positive results.

Conclusions:

• The precise contribution of IFN-I to HIV pathogenesis and control is complex and context-dependent.
• IFN-I signaling is critical in acute HIV infection, while its role in chronic infection warrants further investigation for therapeutic targeting.
• Understanding IFN-I dynamics is essential for developing effective HIV treatment and management strategies.