Manipulation of Host Cell Death Pathways by Herpes Simplex Virus

Area of Science:

• Virology
• Immunology
• Cell Biology

Background:

• Herpes simplex virus (HSV)-1 and HSV-2 are common human viruses causing lifelong infections.
• Cell death, including apoptosis and necroptosis, is a key host defense mechanism against pathogens.
• HSV has evolved strategies to evade these cell death responses for persistent infection.

Purpose of the Study:

• To review the molecular interactions between HSV-1 proteins and host cell death pathways.
• To highlight how HSV-1 manipulates apoptosis and necroptosis for viral propagation.
• To understand the species-specific mechanisms of HSV-1 in evading cell death.

Main Methods:

• Review of existing literature on HSV-1 interactions with host cell death.
• Analysis of viral protein functions, specifically ICP6, in modulating apoptosis and necroptosis.
• Comparison of HSV-1's effects on cell death in human versus mouse models.

Main Results:

• HSV-1 encodes viral inhibitors, such as ICP6, that target host cell death pathways.
• ICP6 suppresses both caspase-mediated apoptosis and RIPK3-mediated necroptosis in human cells.
• In contrast, ICP6 activates necroptosis in mouse cells, demonstrating species-specific manipulation.

Conclusions:

• HSV-1 utilizes sophisticated strategies to subvert host cell death, ensuring its lifelong persistence.
• The viral protein ICP6 plays a critical role in modulating apoptosis and necroptosis in a species-specific manner.
• Understanding these interactions is crucial for developing antiviral therapies targeting HSV-1 propagation.