No Evidence for Selection of HIV-1 with Enhanced Gag-Protease or Nef Function among Breakthrough Infections in the CAPRISA 004 Tenofovir Microbicide Trial

作者：Chopera Denis R; Mann Jaclyn K; Mwimanzi Philip; Omarjee Saleha; Kuang Xiaomei T; Ndabambi Nonkululeko; Goodier Sarah; Martin Eric; Naranbhai Vivek; Karim Salim Abdool; Karim Quarraisha Abdool; Brumme Zabrina L; Ndung' u Thumbi; Williamson Carolyn^*; Brockman Mark A

来源：PLos One, 2013, 8(8): e71758.

DOI：10.1371/journal.pone.0071758

Background: Use of antiretroviral-based microbicides for HIV-1 prophylaxis could introduce a transmission barrier that inadvertently facilitates the selection of fitter viral variants among incident infections. To investigate this, we assessed the in vitro function of gag-protease and nef sequences from participants who acquired HIV-1 during the CAPRISA 004 1% tenofovir microbicide gel trial. %26lt;br%26gt;Methods and Results: We isolated the earliest available gag-protease and nef gene sequences from 83 individuals and examined their in vitro function using recombinant viral replication capacity assays and surface protein downregulation assays, respectively. No major phylogenetic clustering and no significant differences in gag-protease or nef function were observed in participants who received tenofovir gel versus placebo gel prophylaxis. %26lt;br%26gt;Conclusion: Results indicate that the partial protective effects of 1% tenofovir gel use in the CAPRISA 004 trial were not offset by selection of transmitted/early HIV-1 variants with enhanced Gag-Protease or Nef fitness.

• 出版日期2013-8-28