Short communication: dynamic constraints on the second phase compartment of HIV-infected cells
Adam M Spivak1, S Alireza Rabi, Moira A McMahon
1Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21218, USA.
Abstract:
The cells responsible for the second phase decay of HIV-1 viremia following the initiation of antiretroviral therapy have yet to be identified. A dynamic model that considers where drugs act in the virus life cycle places constraints on candidate cell types. In this regard, the rapid drop in viremia in patients starting regimens containing the integrase inhibitor raltegravir is of particular interest. We show here that the time delay between reverse transcription and integration is short in differentiated macrophages, making these cells poor candidates for the second phase compartment under the assumptions of standard models of viral dynamics.
Insights
Identifying the cells causing the second phase of HIV-1 viremia decay is crucial. Our study suggests differentiated macrophages are unlikely candidates due to a short reverse transcription-to-integration delay, impacting viral dynamics models.
Area of Science:
- Virology
- Immunology
- Mathematical Modeling
Background:
- The cellular reservoirs driving persistent Human Immunodeficiency Virus type 1 (HIV-1) replication during antiretroviral therapy (ART) remain incompletely understood.
- Identifying these reservoirs is critical for developing strategies to achieve a functional cure for HIV-1.
- Previous dynamic models of HIV-1 infection have proposed different cellular compartments responsible for viral decay phases.
Purpose of the Study:
- To investigate the cellular candidates responsible for the second phase of HIV-1 viremia decay after initiating ART.
- To evaluate the role of differentiated macrophages as a potential viral reservoir based on drug action and viral kinetics.
- To refine mathematical models of HIV-1 dynamics by incorporating specific cellular properties.
Main Methods:
- Utilized a dynamic mathematical model of HIV-1 infection and replication.
- Incorporated the known sites of action for antiretroviral drugs, specifically integrase inhibitors like raltegravir.
- Analyzed the impact of the intracellular time delay between reverse transcription and viral DNA integration in different cell types, focusing on differentiated macrophages.
Main Results:
- The rapid decline in HIV-1 viremia observed with integrase inhibitors suggests a specific drug-target interaction.
- Differentiated macrophages exhibit a short intracellular delay between reverse transcription and integration.
- This short delay makes differentiated macrophages unlikely candidates for the persistent viral reservoir driving the second phase of viremia decay in standard viral dynamic models.
Conclusions:
- Differentiated macrophages are poor candidates for the cellular compartment responsible for the second phase of HIV-1 decay under current viral dynamic model assumptions.
- The kinetics of reverse transcription and integration in macrophages do not align with the observed viral load reduction patterns with integrase inhibitors.
- Further research is needed to identify the specific cell types that constitute the latent HIV-1 reservoir and contribute to viral persistence during therapy.
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