Modeling HIV-1 Latency in Primary T Cells Using a Replication-Competent Virus

Area of Science:

• Virology
• Immunology
• Cell Biology

Background:

• Studying HIV-1 latency in vivo is challenging due to the extremely low frequency of latently infected cells.
• In vitro models are crucial, but often use defective viruses, limiting their recapitulation of natural infection dynamics.
• Replication-competent viruses offer a more accurate model but necessitate the use of antiretrovirals in culture.

Purpose of the Study:

• To develop and validate an in vitro model for studying HIV-1 latency using replication-competent viruses.
• To generate latently infected cells that can be reactivated under conditions mimicking antiretroviral treatment (ART).
• To implement methods for efficient removal of productively infected cells and increased throughput in latency studies.

Main Methods:

• Utilized cultured central memory CD4(+) T cells and replication-competent HIV-1 for infection.
• Incorporated antiretroviral drugs during latency establishment and reactivation phases.
• Developed a method to eliminate productively infected cells by exploiting HIV-1-induced CD4 downregulation.
• Employed a GFP-encoding virus to facilitate high-throughput analysis.

Main Results:

• Successfully generated latently infected CD4(+) T cells using replication-competent HIV-1.
• Demonstrated successful reactivation of latent HIV-1 in the presence of antiretroviral drugs.
• Validated a method for removing productively infected cells, enhancing the study of latent reservoirs.
• Showcased the utility of GFP-encoding viruses for increased experimental throughput.

Conclusions:

• The developed model accurately recapitulates key aspects of HIV-1 latency and reactivation in vitro.
• This model provides a valuable tool for investigating latency-reversing strategies and the impact of ART on viral reservoirs.
• The methodology facilitates more efficient and relevant research into potential HIV-1 cures.