Warunee Chaigamphang. Induction of immunity to plasmodium yoelii MSP1 19 by intranasal immunization using different mucosal adjuvants . Master's Degree(Infectious Diseases and Epidemiology). Mahidol University. : Mahidol University, 2007.
Induction of immunity to plasmodium yoelii MSP1 19 by intranasal immunization using different mucosal adjuvants
Abstract:
The 19 kilodalton-carboxyl-terminal fragment of merozoite surface protein-1
(MSP119) is a potential malaria vaccine candidate. Parenteral immunization with this antigen
induced complete protection in mice but intranasal immunization using cholera toxin subunit
B (CTB) as adjuvant did not meet that goal. However, the protection is associated with the
titer of the MSP119-specific antibody prior to challenge infection. To find out a more effective
intranasal adjuvant for MSP119 immunization, chitin micro-particles (CMP) were investigated
in this study. In the initial experiment, groups of BALB/c mice were immunized intranasally
with MSP119 mixed with CMP and/or in combination with CTB at days 0, 14, 28, and 42.
Systemic antibody response and protection against P. yoelii challenge infection were
investigated four weeks later. Results showed that CMP was able to induce the antibody
response, but induction by the combination of CMP and CTB was more effective in inducing
the response. The number of inoculations of MSP119 plus CMP and CTB was further
determined and it was found that inoculation twice a week induced higher antibody responses
than inoculation once a week or twice in three weeks. These antibody responses corresponded
to the protection challenge against P. yoelii infection.