Abstract
Anthrax is an acute infectious disease caused by Bacillus anthracis. We previously reported that the adjuvant CIA06B, which consists of TLR4 agonist CIA05 and aluminum hydroxide (alum), enhanced the immune response to anthrax protective antigen (PA) in mice. This study was carried out to determine whether CIA06B can enhance long-term immune responses to PA in mice. BALB/c mice were immunized intramuscularly three times at 2-week intervals with recombinant PA alone or PA combined with alum or CIA06B. At 8 and 24 weeks post-immunization, the immunological responses including serum anti-PA IgG antibody titer, toxin-neutralizing antibody titer, splenic cytokine secretion and the frequency of PA-specific memory B cells were assessed. Compared with mice injected with PA alone or PA plus alum, mice injected with PA plus CIA06B had higher titers of serum anti-PA IgG antibodies, and higher frequencies of PA-specific memory B cells and interferon-γ secreting cells. Furthermore, anti-PA antibodies induced by CIA06B were more effective in neutralizing anthrax toxin. These results demonstrated that CIA06B is capable of providing long-term immunity when used as an adjuvant in a PA-based anthrax vaccine.
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Acknowledgments
This study was supported by a grant from Korea Centers for Disease Control and Prevention, a grant of the TEPIK, Korea Healthcare technology R&D Project by Ministry of Health & Welfare, Republic of Korea (A103001), and a grant from the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (No. 20090236).
Conflict of interest
NG Lee: Inventor of EyeGene-owned patents, Research Grant (EyeGene).
Ethics
All animal experiments were conducted using protocols approved by the animal care and use committees at Sejong University (Document no.: SJ-20100401007 approved on April 19, 2010).
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Wui, S.R., Han, J.E., Kim, Y.H. et al. Increased long-term immunity to Bacillus anthracis protective antigen in mice immunized with a CIA06B-adjuvanted anthrax vaccine. Arch. Pharm. Res. 36, 464–471 (2013). https://doi.org/10.1007/s12272-013-0034-5
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DOI: https://doi.org/10.1007/s12272-013-0034-5