Herpesvirus vector-mediated gene delivery to human monocytes

Area of Science:

• Virology
• Gene Therapy
• Immunology

Background:

• Replication-incompetent herpesvirus vectors can deliver therapeutic genes.
• Human immunodeficiency virus (HIV) infects monocytes, a key cell type in its replication cycle.
• Interferon-alpha (IFN-alpha) has shown potential in inhibiting viral replication.

Purpose of the Study:

• To investigate the feasibility of using vector-infected human monocytes for interferon-alpha (IFN-alpha) gene delivery.
• To optimize culture conditions for efficient vector infection and gene expression in monocytes.
• To evaluate the efficacy of this gene delivery system in inhibiting HIV replication.

Main Methods:

• Isolation of human monocytes and assessment of culture conditions for vector infection.
• Infection of monocytes with a replication-incompetent herpesvirus vector expressing IFN-alpha.
• Co-culture of vector-infected monocytes with HIV-infected monocytes to assess viral inhibition.
• Superinfection rescue assay to determine vector persistence.

Main Results:

• Monocytes were efficiently infected with the herpesvirus vector between 1 and 7 days post-isolation.
• IFN-alpha expression was higher in monocytes infected 7 days post-isolation.
• Delivery of IFN-alpha via vector-infected monocytes inhibited HIV replication, even in advanced infections.
• The viral vector remained recoverable for at least 7 days, despite transient gene expression.

Conclusions:

• Vector-mediated IFN-alpha gene delivery to human monocytes is a viable strategy for inhibiting HIV replication.
• Optimized culture conditions enhance vector infection and gene expression in monocytes.
• This approach demonstrates potential for therapeutic intervention against HIV infection.