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Summary

for people ages 18 years and up (full criteria)
study started
estimated completion:

Description

Summary

The aim of this project is to determine whether latent HIV is enriched in cells expressing certain proteins (receptors) on their surface and whether it is possible to eliminate these cells through the use of drugs that specifically target these proteins. Lymph nodes are known to contain very high numbers of HIV infected cells.

Official Title

HIV Persistence in Lymph Node Tissue and Peripheral Blood: The Role of Immune Checkpoints

Details

Combination antiretroviral therapy (ART) has significantly improved the immune function of HIV infected individuals and has transformed a fatal disease into a chronic infection for those with access to ART. Despite suppressing HIV-1 replication, ART is not curative and nearly all HIV infected individuals experience viral rebound within weeks or months of discontinuing ART. This rebound is because HIV is able to hide in long-lived and proliferating CD4+ T cells, a specific type of cell, found in the immune system. The ability to hide is referred to as HIV latency.

One strategy towards eliminating the reservoir of latently infected cells is characterized by the use of latency reversing agents (LRA) to reverse HIV-1 latency. This exposes virus-expressing cells to the immune system and ART virus-mediated cell lysis or immune-mediated killing. Emerging data suggests that HIV-1 is enriched in cells expressing certain proteins known as immune checkpoints (IC). Immune checkpoint proteins play an important role in the regulation of the immune system. By blocking the immune checkpoint with drugs, this approach would allow the immune system to recognize HIV infected cells as foreign and thereby attack and kill the cell. Currently, there are licensed antibodies to the specific IC known as PD-1 (Programmed cell death protein 1) and CTLA4 (Cytotoxic T-Lymphocyte Associated Protein 4). These antibodies are in clinical use for the treatment of a range of malignancies.

Most of what is known about HIV-1 latency, reservoir composition, activation of HIV-1 by LRAs and viral enrichment in cells expressing IC in individuals on suppressive ART, is based on studies of peripheral blood T cells rather than lymphoid tissue. However, only 10% of the body's total CD4+T cell population is circulating at any one time. The rest of the CD4+ T cell population resides in the lymph nodes. In addition, cells that express IC are usually located in lymph nodes.

Using CD4+ T-cells from blood and lymph node tissue collected from HIV-infected individuals on ART, this study will examine if HIV is located in cell populations that express ICs and if blocking IC pathways can boost immune recognition of HIV infected cells.

Keywords

HIV-1-infection HIV Latent reservoir Leukapheresis Inguinal lymph node biopsy Immune checkpoint PD1 CTLA4

Eligibility

You can join if…

Open to people ages 18 years and up

  • Written Informed Consent
  • Willing to undergo leukapheresis and lymph node biopsy
  • Documented HIV-1 infection (antibody positive or detectable plasma HIV-1 RNA)
  • Receiving combination ART
  • HIV RNA < 50 copies/mL for > 3 years (Episodes of a single HIV plasma RNA 50-500 copies/mL will not exclude participation if the subsequent HIV plasma RNA was <50 copies/mL)

You CAN'T join if...

  • Unwillingness to follow protocol requirements
  • Contraindications to LN biopsy or leukapheresis
  • Current skin infection of inguinal area
  • Known current lower extremity, gastrointestinal or genitourinary infection

Details

Status
accepting new patients
Start Date
Completion Date
(estimated)
Sponsor
University of Melbourne
ID
NCT03426189
Study Type
Observational
Last Updated
February 1, 2018
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