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Überla, K.* ; Rosenwirth, B. ; Ten Haaft, P.* ; Heeney, J.* ; Sutter, G. ; Erfle, V.

Therapeutic immunization with Modified Vaccinia Virus Ankara (MVA) vaccines in SIV-infected rhesus monkeys undergoing antiretroviral therapy.

J. Med. Primatol. 36, 2-9 (2007)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
he long-term benefits of highly active antiretroviral therapy in HIV-infected patients are limited by emergence of drug-resistant variants and side effects. Therefore, we studied the concept of therapeutic immunization in 18 rhesus monkeys infected with a highly pathogenic simian immunodeficiency virus (SIV) swarm. METHODS: Monkeys were treated with the reverse transcriptase inhibitor (R)-9-(2-phosphonylmethoxypropyl)adenine (PMPA) for 19 weeks starting 10 days after infection. After suppression of viremia, one group of monkeys was immunized with recombinant modified vaccinia virus Ankara (MVA) vectors expressing gag-pol and env. A second group received MVA vectors expressing the regulatory genes tat, rev and nef, while a third group was not immunized. RESULTS: Immunization with gag-pol and env expressing MVA enhanced SIV antibody titers. Following discontinuation of PMPA treatment, a rebound in viral load was observed. However, in three of six monkeys immunized with MVA gag-pol and MVA env, and two of six monkeys immunized MVA expressing regulatory genes set point RNA levels were below or close to a threshold level of 10(4) RNA copies/ml, while only one of six unvaccinated monkeys maintained such low RNA levels. CONCLUSIONS: Although a subset of animals seem to benefit from therapeutic immunization with MVA vectors, the difference in set point RNA levels between the groups did not reach statistical significance.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords HIV; SIV; therapeutic immunization
ISSN (print) / ISBN 0047-2565
e-ISSN 1600-0684
Journal Journal of Medical Primatology
Quellenangaben Volume: 36, Issue: 1, Pages: 2-9 Article Number: , Supplement: ,
Publisher Wiley
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Virology (VIRO)