AIDS Vaccine Study Comparing Immunogenicity and Safety of 3 Doses of Lipopeptides Versus Placebo in Non Infected HIV Volunteers
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Primary Purpose: Prevention
|Official Title:||Randomised Double Blinded Phase II AIDS Vaccine Study Comparing Immunogenicity and Safety of 3 Doses of Lipopeptide (LIPO-5) Versus Placebo in Non Infected HIV Volunteers (ANRS VAC 18)|
- Percentage of patients with CD8 immune response on ELISPOT IFN-gamma at week (W) 48
- Local and general adverse events
- Percentage of subjects with CD4 immune response against different peptides of LIPO-5
- Percentage of subjects with sustained response at week 48
- Percentage of subjects with response against more than 1 peptide (multiepitopic response)
|Study Start Date:||September 2004|
|Study Completion Date:||December 2007|
|Primary Completion Date:||November 2007 (Final data collection date for primary outcome measure)|
The aims of HIV lipopeptide vaccination approach are to improve cell mediated immune responses in order to obtain strong, long lasting and polyepitopic responses and to focus these responses on highly conserved and immunogenic epitopes.
Lipopeptides are chemically synthetized peptides, bearing HIV epitopes, covalently bound to a fatty acid moiety, a monopalmtoyl chain in this case. This lipid chain produces internalization of the lipopeptide into the cytoplasm of the antigen presenting cells. Combinations of several lipopeptides containing sequences from different HIV proteins are used in vaccination trials in order to increase polyepitopic responses. Lipopeptides have been synthetized by the French National Agency for Research on AIDS and Viral Hepatitis (ANRS) preventive program by the group of Helen Gras following a long and meticulous work of epitope screening performed by the team of Jean-Gérard Guillet at the Cochin Institute in Paris. The epitopes were selected on the basis of their strong affinity for HLA class I molecule, on their ability to form a stable complex with these molecules, and on the capacity of these epitopes to be recognized by T cells. The selected peptides are those containing the richest array of epitopes and those most frequently recognized by HIV infected patients. Each peptide has a length of 23 to 32 amino acids (AA).
Different types of lipopeptides constructs have been tested in humans. Among these constructs, LIPO-5 contains 5 lipopeptides from gag, nef and pol corresponding to more than 50 epitopes. LIPO-5 has been shown to be immunogenic and well tolerated in a first phase I trial in non-HIV infected volunteers. Lower doses of each peptide could have a similar immunogenicity.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00121758
|CIC de Vaccinologie Cochin Pasteur|
|Paris, France, 75014|
|Principal Investigator:||Dominique Salmon, MD||Hopital Cochin Paris. Centre des essais vaccinaux Cochin Pasteur|
|Study Chair:||Christine Durier||Inserm SC10|