Immune Responses in Patients Treated With Raltegravir (RAG-1/2)

This study has been terminated.
(Unexpected and severe difficulties in recruitment.)
Sponsor:
Collaborator:
Merck Sharp & Dohme Corp.
Information provided by (Responsible Party):
Chris Tsoukas, McGill University Health Center
ClinicalTrials.gov Identifier:
NCT00785967
First received: November 4, 2008
Last updated: September 27, 2011
Last verified: September 2011
  Purpose

Hypothesis: Treatment with raltegravir does not alter V(D)J recombination or immune responses to neoantigens.

A process known as V(D)J recombination is essential for developing lymphocytes and the specific functioning of the immune system. Raltegravir is the first approved drug of the new integrase inhibitor class of anti-HIV drugs. Integrase inhibitors have been shown in some studies to interfere with DNA cleavage and the activities of RAG-1/2. These studies suggest a potential to affect aspects of both B-cell and T-cell development, therefore, it is important to evaluate the potential effects that integrase inhibitors may have in clinical use. If immunoglobulin and T-cell receptor genes are altered by HIV integrase, then patient lymphocytes will fail to display normal responses to vaccinations.


Condition Intervention Phase
HIV Infections
Biological: Various vaccines
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Basic Science
Official Title: Immune Responses to Neo-Antigens in Patients Treated With Raltegravir: Insights on V(D)J Recombination and RAG-1/2 Recombinase Function

Resource links provided by NLM:


Further study details as provided by McGill University Health Center:

Primary Outcome Measures:
  • Percent of patients with phiX174 IgG greater than or equal to 30% of total anti-phiX174 titers [ Time Frame: Two weeks after fourth phiX174 immunization ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Total phiX174 antibody titers [ Time Frame: 2 and 4 weeks after each immunization ] [ Designated as safety issue: No ]

Enrollment: 0
Study Start Date: January 2009
Estimated Study Completion Date: June 2013
Estimated Primary Completion Date: December 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
raltegravir 400mg bid + Truvada 1 tab qd
Biological: Various vaccines
VAQTA: 1.0ml IM at weeks 24 & 48; Pneumovax 23: 0.5ml IM at screening; Td ADSORBED: 0.5ml IM at screening; phiX174 bacteriophage: 0.02ml/kg body weight IV at weeks 28, 32, 36, 40.
Other Names:
  • VAQTA;
  • Pneumovax 23;
  • Td ADSORBED;
  • phiX174 bacteriophage
Active Comparator: 2
efavirenz 600mg qhs + Truvada 1 tab qd (or Atripla 1 tab qhs)
Biological: Various vaccines
VAQTA: 1.0ml IM at weeks 24 & 48; Pneumovax 23: 0.5ml IM at screening; Td ADSORBED: 0.5ml IM at screening; phiX174 bacteriophage: 0.02ml/kg body weight IV at weeks 28, 32, 36, 40.
Other Names:
  • VAQTA;
  • Pneumovax 23;
  • Td ADSORBED;
  • phiX174 bacteriophage

Detailed Description:

V(D)J recombination is essential for developing lymphocytes and the specific functioning of the immune system. Germline gene coding segments become rearranged to create functional immunoglobulin and T-cell receptor genes by this recombination. The process depends on site-specific cleavage of chromosomal DNA by RAG-1 and RAG-2 recombinase. Two recombination-activating gene proteins (RAG-1/2) in conjunction make up a complex of enzymes that join gene segments of B-cell and T-cell receptor genes. RAG-1 contains most of the V(D)J recombinase active site and RAG-2 is essential in joining DNA segments during V(D)J recombination. RAG-1/2 have similarity in action to other DNA transposases and HIV-1 integrase. These similarities suggest that HIV-1 integrase inhibitors may have the potential to affect aspects of both B-cell and T-cell development.

Induction of primary immune responses to neoantigens involves the generation of specific T-cells and immunoglobulin M (IgM) antibody secreting B-cells. As part of this process, T and B memory cells are also generated, which have specific cell surface receptors to the antigen. On repeat exposure to the antigen, these memory T- and B-cells are triggered to generate rapid and intense secondary responses. During this secondary response, B-cells secrete abundant specific IgG antibodies with greater affinity to the antigen than for the IgM isotope. This memory response is mediated by T-cells with CD45+ RO+ phenotype. These T-cells provide B-cells the help required to generate the specific IgG. Sub-optimal antibody responses are seen in both acquired and hereditary immunodeficiency, which are due to impaired T-cell function including poor T-helper responses to B-cells and defective neo-antigen responses.

An established method to evaluate T-cell function involves testing antibody production to vaccination with phiX174, a stable bacteriophage of E. Coli that is critical in demonstrating T-cell competence. Antibody titers after primary and secondary immunization correlate with abnormal CD4 cell help. Patients with functional B-cells that lack T-cell help show a characteristic failure to switch from IgM to IgG, making this assay essential in the evaluation of V(D)J recombination.

Currently, raltegravir is the only approved integrase inhibitor that targets the integration stage of the HIV-1 lifecycle. The clinical manifestations of raltegravir-related potential adverse effects on V(D)J recombination may be so rare that they may only be observed after large numbers of patients are exposed to this drug. Evaluating the direct in vivo interaction of HIV integrase inhibitors on RAG-1/2 is difficult, therefore the best approach may be to evaluate the potential negative effects on recombinase activity downstream by studying immune function. If gene rearrangements of immunoglobulin and T-cell receptor genes are altered by HIV integrase, then patient lymphocytes will fail to display normal responses to neo-antigen exposure. Since untreated HIV-infected individuals have an impaired ability to respond to new antigens, it is difficult to evaluate the responses to neo-antigens in these individuals. Therefore, to test this hypothesis, it would be best to choose patients with long-term control of HIV that have recovered immune function.

  Eligibility

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  1. HIV-1 infected males, as determined by ELISA and Western blot;
  2. >18 years of age;
  3. Current ARV therapy with efavirenz + Truvada® for >52 weeks;
  4. HIV-1 RNA (bDNA) <50 copies/ml for at least 52 weeks;
  5. No history of hepatitis A vaccine, and HAV antibody negative.

Exclusion Criteria:

  1. any immunomodulatory therapy within 24 weeks of screening or during the trial;
  2. any type of vaccine within 24 weeks of screening or during the trial;
  3. current opportunistic infection, malignancy, acute infection, or febrile illness;
  4. history of hypersensitivity to a vaccine, components of a vaccine, or components of a vaccine container.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00785967

Locations
Canada, Quebec
Immune Deficiency Treatment Centre, Montreal General Hospital, McGill University Health Centre
Montreal, Quebec, Canada, H3G 1A4
Sponsors and Collaborators
McGill University Health Center
Merck Sharp & Dohme Corp.
Investigators
Principal Investigator: Christos M Tsoukas, MD, FRCPC McGill University Health Center
  More Information

Publications:
Responsible Party: Chris Tsoukas, Director, Division of Allergy & CLinical Immunology, MUHC, McGill University Health Center
ClinicalTrials.gov Identifier: NCT00785967     History of Changes
Other Study ID Numbers: MK0518-048-00, Version 2.2, HC-TPD Control # 120132
Study First Received: November 4, 2008
Last Updated: September 27, 2011
Health Authority: Canada: Health Canada

Keywords provided by McGill University Health Center:
V(D)J recombination; RAG-1/2 recombinase function

Additional relevant MeSH terms:
HIV Infections
Acquired Immunodeficiency Syndrome
Lentivirus Infections
Retroviridae Infections
RNA Virus Infections
Virus Diseases
Sexually Transmitted Diseases, Viral
Sexually Transmitted Diseases
Immunologic Deficiency Syndromes
Immune System Diseases
Slow Virus Diseases

ClinicalTrials.gov processed this record on September 18, 2014