Harrison, JodieBertram, EdwardBoyle, David BCoupar, Barbara E HRanasinghe, CharaniRamshaw, Ian2015-12-070264-410Xhttp://hdl.handle.net/1885/19053We have constructed a recombinant fowlpox virus expressing HIV antigens and the costimulatory molecule 4-1BBL. When included in the boost, but not the prime of a poxvirus prime-boost strategy, 4-1BBL significantly enhanced the anti-HIV T cell response generated to this vaccination in BALB/c mice, as detected by ex vivo IFNγ ELISPOT responses, intracellular cytokine staining to HIV Gag antigens, and enumeration of Gag-reactive CD8 T cells. 4-1BBL however, is not capable of modulating the CD4 T cell response, nor the antibody response to this vaccination strategy. Enhancement of the T cell response by 4-1BBL continues into the memory phase, as detected 2 months post vaccination. This data is the first to show modulation of the immune response to a viral vaccine by coexpression of 4-1BBL and supports this strategy as an exciting approach for enhancement of T cell memory in prime-boost vaccines.Keywords: poxvirus prime boost vaccine; unclassified drug; virus vaccine; animal cell; animal experiment; animal model; animal tissue; antibody response; antigen expression; article; cell stimulation; controlled study; cytokine release; enzyme linked immunospot ass Costimulation; T cells; Vaccination200610.1016/j.vaccine.2006.06.0072015-12-07