BACKGROUND: Clinical trials of CCR5 antagonists have relied on the phenotypic determination of HIV-1 coreceptor usage. Few phenotypic assays are available, with few data on their concordance, and none has been designed to determine tropism from cell-associated HIV-1 DNA. OBJECTIVES: To assess the performance of the new Toulouse Tropism Test (TTT) phenotypic assay to characterize HIV-1 tropism using blood plasma and peripheral blood mononuclear cells (PBMC). STUDY DESIGN: 434 plasma and 168 PBMC samples were tested with the TTT assay. We determined the correlation between our assay results on plasma samples and those of the commercial Trofile assay. RESULTS: The TTT assay determined the tropism of 97% of samples after successful amplification of the env gene. It performed well on both cell samples and plasma samples with various HIV-1 loads and subtypes. It detected 0.5% of minor CXCR4-using variants in the virus population. The TTT and the Trofile assays were >90% concordant for predicting HIV-1 tropism. CONCLUSION: We have validated a new recombinant virus phenotypic assay for determining HIV-1 tropism using both plasma and cell samples from patients who are candidates for treatment with CCR5 antagonists.
BACKGROUND: Clinical trials of CCR5 antagonists have relied on the phenotypic determination of HIV-1 coreceptor usage. Few phenotypic assays are available, with few data on their concordance, and none has been designed to determine tropism from cell-associated HIV-1 DNA. OBJECTIVES: To assess the performance of the new Toulouse Tropism Test (TTT) phenotypic assay to characterize HIV-1 tropism using blood plasma and peripheral blood mononuclear cells (PBMC). STUDY DESIGN: 434 plasma and 168 PBMC samples were tested with the TTT assay. We determined the correlation between our assay results on plasma samples and those of the commercial Trofile assay. RESULTS: The TTT assay determined the tropism of 97% of samples after successful amplification of the env gene. It performed well on both cell samples and plasma samples with various HIV-1 loads and subtypes. It detected 0.5% of minor CXCR4-using variants in the virus population. The TTT and the Trofile assays were >90% concordant for predicting HIV-1 tropism. CONCLUSION: We have validated a new recombinant virus phenotypic assay for determining HIV-1 tropism using both plasma and cell samples from patients who are candidates for treatment with CCR5 antagonists.
Authors: A Gonzalez-Serna; R A McGovern; P R Harrigan; F Vidal; A F Y Poon; S Ferrando-Martinez; M A Abad; M Genebat; M Leal; E Ruiz-Mateos Journal: Antimicrob Agents Chemother Date: 2011-12-05 Impact factor: 5.191
Authors: Julia Dina; Stephanie Raymond; Anne Maillard; Helene Le Guillou-Guillemette; Audrey Rodalec; Agnes Beby-Defaux; Genevieve Giraudeau; Sophie Vallet; Thomas Mourez; Christopher Payan; Astrid Vabret; Annick Ruffault; Virginie Ferre; Jacques Izopet; Jean-Christophe Plantier Journal: J Clin Microbiol Date: 2013-06-26 Impact factor: 5.948
Authors: P Recordon-Pinson; S Raymond; P Bellecave; A G Marcelin; C Soulie; D Descamps; V Calvez; P R Harrigan; H Fleury; J Izopet; B Masquelier Journal: Antimicrob Agents Chemother Date: 2012-12-03 Impact factor: 5.191
Authors: Jan Weber; Ana C Vazquez; Dane Winner; Richard M Gibson; Ariel M Rhea; Justine D Rose; Doug Wylie; Kenneth Henry; Alison Wright; Kevin King; John Archer; Eva Poveda; Vicente Soriano; David L Robertson; Paul D Olivo; Eric J Arts; Miguel E Quiñones-Mateu Journal: J Clin Microbiol Date: 2013-03-13 Impact factor: 5.948