RNA Polymerase III Regulates HIV Replication and Latency.

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• Eliminating latent Human Immunodeficiency Virus (HIV) reservoirs is a major hurdle in achieving a cure.
• Understanding the mechanisms regulating HIV latency is crucial for developing effective therapeutic strategies.

Purpose of the Study:

• To investigate the role of RNA Polymerase III (RNAP III) in regulating HIV latency and replication.
• To explore RNAP III as a potential therapeutic target for reactivating latent HIV reservoirs.

Main Methods:

• Pharmacological inhibition of RNAP III in cell lines (T and monocytic) and primary CD4 T cells.
• Assessment of HIV transcription and latency reactivation using HIV-1 pseudotyped and HIV-1-Bal viruses.
• Quantification of total HIV DNA to assess viral persistence.

Main Results:

• Pharmacological inhibition of RNAP III strongly reactivated HIV latency in various cell models.
• RNAP III inhibition significantly increased HIV transcription in cell lines and primary CD4 T cells up to 72 hours.
• Total HIV DNA levels remained unchanged, indicating reactivation without increased viral production.

Conclusions:

• RNA Polymerase III plays a previously unrecognized role in restricting HIV transcription.
• Targeting RNAP III-driven mechanisms represents a novel strategy to reactivate latent HIV reservoirs.
• RNAP III inhibition offers a potential pathway to enhance the efficacy of HIV eradication therapies.