Abstract:
:The ability of ALVAC- or fowlpox-based simian immunodeficiency virus (SIV) vaccines to boost SIV-specific CD4+ and CD8+ T-cell responses was tested in 10 vaccinia-experienced macaques infected with SIVmac251. The CD8+ T-cell response to the dominant Gag(181-189) CM9 was quantitated in seven Mamu-A*01-positive macaques by tetramer staining, by ex vivo cytotoxic T-lymphocyte (CTL) activity, and by intracellular cytokine staining (ICS) with the specific Gag(181-189) CM9 peptide. The overall CD8+ T-cell response to Gag was assessed using a peptide pool encompassing the entire Gag protein followed by measurement of TNF-alpha production in ICS assay. Similarly, virus-specific CD4+ T-cell responses were measured by ICS for TNF-alpha following stimulation with the Gag-overlapping peptide and by proliferative response following stimulation with purified p27 Gag. The two vaccine modalities effectively boosted both CD4+ and CD8+ SIV-specific T-cell response despite prior exposure to the vaccinia-derivative NYVAC vector, suggesting that sequential boosting with either avipox-based vector vaccine candidate is a realistic approach in immune therapy of human immunodeficiency virus type 1 (HIV-1)-infected individuals.
journal_name
Vaccinejournal_title
Vaccineauthors
Nacsa J,Radaelli A,Edghill-Smith Y,Venzon D,Tsai WP,Morghen Cde G,Panicali D,Tartaglia J,Franchini Gdoi
10.1016/j.vaccine.2003.08.028subject
Has Abstractpub_date
2004-01-26 00:00:00pages
597-606issue
5-6eissn
0264-410Xissn
1873-2518pii
S0264410X03006376journal_volume
22pub_type
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