The recombinant protein combination vaccine based on the fragment C of
tetanus toxin and the cross-reacting material 197
Abstract
Tetanus and diphtheria are important public health problems in many
parts of the world. Since the diphtheria, tetanus toxoids and acellular
pertussis vaccine (DTaP) was generally administered to children, the
incidence of diphtheria and tetanus has dropped dramatically. However,
with the increase of age, the anti-diphtheria and tetanus antibody in
human body will decrease. DTaP is not suitable for boosting vaccine and
the recombinant vaccine have more advantages than toxoid vaccines.
Therefore, in this study, firstly, we expressed and purified the
fragment C of tetanus toxin (TTc) and the cross-reacting material 197
(CRM197) of the diphtheria toxin mutant from E. coli BL21(DE3)
expression system respectively. Moreover, the characteristics,
immunogenicity of the purified protein were analyzed. Lastly, the
recombinant TTc and CRM197 combination vaccine (RTCV) was constructed
and antibody titers were detected. Our results displayed TTc induced Th2
immune response in mice while CRM197 could induce a mix Th1/Th2 immune
response. RTCV was composed of 10 μg/mL TTc, 20 μg/mLCRM197 antigens and
aluminum adjuvants (50 μg/mL). We found that the IgG and IgG1 antibody
titers produced in mice were similar as those produced by DTaP, except
the IgG2a antibody titers. The results above will provide technical
support for the future combined recombinant protein vaccine to against
diphtheria and tetanus.