We have developed a simple model of the formation of 2-LTR HIV DNA episomes following the addition of integrase inhibitor such as raltegravir to an apparently suppressive antiviral regimen. When 2-LTR concentration data from recent raltegravir intensification experiments is fit to our model, the results strongly suggest that the -LTR episomes are being formed in a compartment where the antiviral drugs are unable to contain HIV replication. The primary research objective of this project is to develop specific testable hypotheses to guide a future clinical validation experiment to confirm these findings. Understanding the mechanisms by which HIV replication may continue in patients with no virus detectable in their blood is critically important to efforts to treat and/or cure HIV infection. If cryptic viremia persists, the HIV-positive patient will eventually develop drug-resistant virus and be forced to switch treatment regimens. The mathematical models developed in the proposed research may provide a minimally invasive experimental method to detect and quantify cryptic viremia. This is a critical first step in being able to study and eliminate this phenomenon in HIV medicine. We will use Bayesian statistics to validate our model against a new dataset, develop model extensions that allow us to plan for other measurements, and develop sampling schedules that optimize the information while minimizing the cost and invasiveness of the experiment.

Public Health Relevance

Recent experimental results suggest that high levels of locally uncontrolled HIV virus replication can continue in patients whose measured blood HIV levels are consistently low. This has significant implications for the durability of antiviral therapy, and fo any attempts to cure HIV infection. If successful, the proposed research will allow detection and monitoring of this phenomenon.

Agency
National Institute of Health (NIH)
Type
Exploratory/Developmental Grants (R21)
Project #
1R21AI110288-01A1
Application #
8732302
Study Section
AIDS Clinical Studies and Epidemiology Study Section (ACE)
Program Officer
Lawrence, Diane M
Project Start
Project End
Budget Start
Budget End
Support Year
1
Fiscal Year
2014
Total Cost
Indirect Cost
Name
University of Delaware
Department
Engineering (All Types)
Type
Biomed Engr/Col Engr/Engr Sta
DUNS #
City
Newark
State
DE
Country
United States
Zip Code
19716