AERAS-402 is a novel tuberculosis vaccine designed to boost immunity primed by bacillus Calmette-Guérin (BCG), the only licensed vaccine.
The study investigated the safety and immunogenicity of AERAS-402 in healthy Mycobacterium tuberculosis-uninfected BCG-vaccinated adults from a tuberculosis-endemic region of South Africa.
Escalating doses of AERAS-402 vaccine were administered intramuscularly to each of three groups of healthy South African BCG-vaccinated adults, and a fourth group received two injections of the maximal dose. Participants were monitored for 6 months, with all adverse effects documented. Vaccine-induced CD4(+) and CD8(+) T-cell immunity was characterized by an intracellular cytokine staining assay of whole blood and peripheral blood mononuclear cells.
AERAS-402 was well tolerated, and no vaccine-related serious adverse events were recorded. The vaccine induced a robust CD4(+) T-cell response dominated by cells coexpressing IFN-gamma, tumor necrosis factor-alpha, and IL-2 (\"polyfunctional\" cells). AERAS-402 also induced a potent CD8(+) T-cell response, characterized by cells expressing IFN-gamma and/or tumor necrosis factor-alpha, which persisted for the duration of the study.
Vaccination with AERAS-402 is safe and immunogenic in healthy adults. The immunity induced by the vaccine appears promising: polyfunctional T cells are thought to be important for protection against intracellular pathogens such as Mycobacterium tuberculosis, and evidence is accumulating that CD8(+) T cells are also important. AERAS-402 induced a robust and durable CD8(+) T-cell response, which appears extremely promising. Clinical trial registered with www.sanctr.gov.za (NHREC no. 1381).
Abel, B.; Tameris, M.; Mansoor, N.; Gelderbloem, S.; Hughes, J.; Abrahams, D.; Makhethe, L.; Erasmus, M.; de Kock, M.; van der Merwe, L.; Hawkridge, A.; Veldsman, A.; Hatherill, M.; Schirru, G.; Pau, M.G.; Hendriks, J.; Weverling, G.J.; Goudsmit, J.; Sizemore, D.; McClain, J.B.; Goetz, M.; Gearhart, J.; Mahomed, H.; Hussey, G.D.; Sadoff, J.C.; Hanekom, W.A. The Novel Tuberculosis Vaccine, AERAS-402, Induces Robust and Polyfunctional CD4+and CD8+T Cells in Adults. American Journal of Respiratory and Critical Care Medicine (2010) 181 (12) 1407-1417. [DOI: 10.1164/rccm.200910-1484OC]