The perforin-dependent immunological synapse allows T-cell activation-dependent tumor targeting by MLV vector...

Area of Science:

• Immunology
• Virology
• Gene Therapy

Background:

• Retroviral particles attached to T cells can be transported to metastases through adoptive transfer, termed 'viral hitchhiking'.
• Viral particles typically infect tumor cells via envelope/receptor-dependent interactions after T-cell accumulation at tumor sites.

Purpose of the Study:

• To investigate a novel, envelope/receptor-independent pathway for viral particle transfer from T cells to tumor cells.
• To explore the potential of T-cell-mediated viral delivery for gene therapy applications.

Main Methods:

• Investigated T-cell activation-dependent viral transfer mechanisms.
• Utilized retroviral particles (MLV) and analyzed their interaction with activated T cells and tumor cells.
• Assessed the role of perforin in releasing viral particles from endosomes.

Main Results:

• Identified a second pathway for viral transfer independent of viral envelope and tumor cell receptors.
• Demonstrated that T-cell activation and the endosomolytic property of perforin facilitate viral particle release from endosomes.
• Showed that MLV particles lacking viral envelopes can be effectively transferred via T cells.

Conclusions:

• A novel mechanism of viral transfer exploits the immunological synapse, independent of viral envelope proteins.
• This T-cell-mediated delivery system offers a new strategy for in vivo gene delivery, bypassing the need for viral envelope engineering.
• Findings present opportunities to enhance adoptive T-cell therapy efficacy and target vectors for systemic gene delivery.