We hypothesize that a recombinant yellow fever vaccine (rYF) or rDNA (delivered by electroporation along with IL-12; EP+IL-12) prime followed by a recombinant adenovirus serotype 35 (rAd35) boost can control viral replication after either a homologous or heterologous AIDS virus challenge. We plan to test this hypothesis in macaques using rigorous challenges with the highly pathogenic SIV isolates, SIVmac251 and SIVsmE660. In a previous study, we found that a rDNA prime followed by a rAd5 boost (encoding all of the SIVmac239 proteins except for Env) reduced acute and chronic phase replication after a pathogenic SIVsmE660 mucosal challenge in six of eight vaccinated Indian rhesus macaques. Indeed, six of the vaccinees have no detectable viral replication at one year post challenge. This positive outcome is exceedingly rare in vaccine experiments using a pathogenic SIV challenge. We also discovered that vaccineinduced T cell responses against Gag and Vif correlated with this good outcome. We postulate that there are additional targets in the SIV proteome that can induce efficacious T cell responses. More recently our colleagues at lAVI have shown that vaccination with rDNA plasmids encoding all of the SIV proteins (including Env) by EP along with a plasmid encoding IL-12, followed by a rAd5 boost reduced viral replication of the highly pathogenic SIVmac239 challenge virus in seven of eight macaques. Indeed these vaccine results, along with the recent findings of Louis Picker using recombinant rhesus cytomegalovirus (rhCMV) vectors are the most encouraging non-human primate vaccine results to date. Our intention now is to perform a vaccine study to determine which of the SIV proteins are important targets for the control of viral replication in our first specific aim. In an attempt to improve upon these last two experiments we will also include newly discovered cryptic open reading frames (cORFs) in the vaccine. Our second specific aim is to determine whether a rYF or rDNA (EP+IL-12) prime followed by a rAd35 boost can control viral replication after either a homologous or heterologous AIDS virus challenge.

Public Health Relevance

In this project we will first define the targets of a successful vaccine-induced immune response. We will then deliver these targets using novel vaccine vectors; yellow fever vaccine, rDNA (EP+IL-12) and rAd35. Vaccinated macaques will then be challenged with highly pathogenic homologous and heterologous SIV isolates. The results of these experiments will facilitate HIV vaccine design and thus could help prevent suffering by millions of people.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program Projects (P01)
Project #
5P01AI094420-04
Application #
8874853
Study Section
Special Emphasis Panel (ZAI1)
Project Start
Project End
2016-06-30
Budget Start
2015-07-01
Budget End
2016-06-30
Support Year
4
Fiscal Year
2015
Total Cost
Indirect Cost
Name
University of Miami School of Medicine
Department
Type
DUNS #
052780918
City
Coral Gables
State
FL
Country
United States
Zip Code
33146
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Magnani, Diogo M; Rogers, Thomas F; Maness, Nicholas J et al. (2018) Fetal demise and failed antibody therapy during Zika virus infection of pregnant macaques. Nat Commun 9:1624
Magnani, Diogo M; Ricciardi, Michael J; Bailey, Varian K et al. (2017) Dengue Virus Evades AAV-Mediated Neutralizing Antibody Prophylaxis in Rhesus Monkeys. Mol Ther 25:2323-2331
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