Virological and immunological characterization of novel NYVAC-Based HIV/AIDS vaccine candidates expressing clade C trimeric soluble gp140(ZM96) and Gag(ZM96)-Pol-Nef(CN54) as virus-like particles

Beatriz Perdiguero, Carmen Elena Gómez, Victoria Cepeda, Lucas Sánchez-Sampedro, Juan García-Arriaza, Ernesto Mejías-Pérez, Victoria Jiménez, Cristina Sánchez, Carlos Óscar S Sorzano, Juan Carlos Oliveros, Julie Delaloye, Thierry Roger, Thierry Calandra, Benedikt Asbach, Ralf Wagner, Karen Kibler, Bertram Jacobs, Giuseppe Pantaleo, Mariano Esteban

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The generation of vaccines against HIV/AIDS able to induce long-lasting protective immunity remains a major goal in the HIV field. The modest efficacy (31.2%) against HIV infection observed in the RV144 phase III clinical trial highlighted the need for further improvement of HIV vaccine candidates, formulation, and vaccine regimen. In this study, we have generated two novel NYVAC vectors, expressing HIV-1 clade C gp140(ZM96) (NYVAC-gp140) or Gag(ZM96)-Pol-Nef(CN54) (NYVAC-Gag-Pol- Nef), and defined their virological and immunological characteristics in cultured cells and in mice. The insertion of HIV genes does not affect the replication capacity of NYVAC recombinants in primary chicken embryo fibroblast cells, HIV sequences remain stable after multiple passages, and HIV antigens are correctly expressed and released from cells, with Env as a trimer (NYVAC-gp140), while in NYVAC-Gag-Pol-Nef-infected cells Gag-induced virus-like particles (VLPs) are abundant. Electron microscopy revealed that VLPs accumulated with time at the cell surface, with no interference with NYVAC morphogenesis. Both vectors trigger specific innate responses in human cells and show an attenuation profile in immunocompromised adult BALB/c and newborn CD1 mice after intracranial inoculation. Analysis of the immune responses elicited in mice after homologous NYVAC prime/NYVAC boost immunization shows that recombinant viruses induced polyfunctional Env-specific CD4 or Gag-specific CD8 T cell responses. Antibody responses against gp140 and p17/p24 were elicited. Our findings showed important insights into virus-host cell interactions of NYVAC vectors expressing HIV antigens, with the activation of specific immune parameters which will help to unravel potential correlates of protection against HIV in human clinical trials with these vectors.

Original languageEnglish (US)
Pages (from-to)970-988
Number of pages19
JournalJournal of virology
Volume89
Issue number2
DOIs
StatePublished - 2015

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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