Modeling Varicella Zoster Virus Persistence and Reactivation - Closer to Resolving a Perplexing Persistent State

Area of Science:

• Virology
• Neuroscience
• Immunology

Background:

• The latent state of human herpesvirus varicella zoster virus (VZV) in neurons is not fully understood.
• Key questions remain regarding neuron tropism, reactivation triggers, and immune control of VZV latency.
• Previous in vivo models for VZV infection have been challenging to develop.

Purpose of the Study:

• To review the evolution of VZV persistence models.
• To discuss insights from novel in vitro human neuron culture systems for VZV latency.
• To highlight the utility of these models for studying VZV reactivation and gene expression.

Main Methods:

• Review of existing literature on VZV latency models.
• Analysis of new in vitro human neuron culture systems.
• Integration of findings with recent studies on VZV latency in human cadaver ganglia.

Main Results:

• Recent advances suggest VZV gene expression during latency is more restricted than previously thought.
• Novel in vitro human neuron culture systems successfully establish VZV latency.
• These systems permit experimental reactivation and virus production, offering new research avenues.

Conclusions:

• New in vitro models provide valuable tools for investigating VZV latency and reactivation mechanisms.
• Understanding VZV latency is critical given that up to one-third of the population develops herpes zoster (shingles).
• Further research using these models can elucidate VZV's lifecycle and inform therapeutic strategies.