Herpes simplex virus latency in tissue culture cells

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• Herpes simplex virus (HSV) latency is a critical factor in recurrent infections.
• Studying HSV latency requires robust in vitro models that mimic in vivo conditions.
• Previous models had limitations in efficiency and stability for molecular analysis.

Purpose of the Study:

• To develop and optimize cell culture systems for studying herpes simplex virus (HSV) latency.
• To facilitate molecular investigations into the mechanisms of HSV latency and reactivation.
• To create a system enabling high-efficiency analysis of viral gene expression and genome structure during latency.

Main Methods:

• Utilized human fibroblasts infected with HSV-2 and incubated at 42°C to establish initial latency.
• Employed HSV-1 superinfection or human cytomegalovirus for efficient latent virus reactivation.
• Improved latency establishment using HSV-1 mutants (in1814, in1820) and interferon-alpha pretreatment.

Main Results:

• Initial system established latency with HSV-2, reactivated by superinfection.
• HSV-1 mutant in1814 allowed up to 21% of cells to harbor the viral genome at 42°C or 37°C.
• Mutant in1820 and interferon-alpha pretreatment enabled latency in approximately 100% of cells.

Conclusions:

• Developed optimized cell culture systems for efficient herpes simplex virus (HSV) latency.
• These advanced models are suitable for detailed molecular analysis of HSV latency and reactivation.
• The system provides a powerful tool for understanding viral persistence and recurrence mechanisms.