Enhancement of the immunogenicity of a Mycobacterium tuberculosis fusion
protein using ISCOMATRIX and PLUSCOM nano-adjuvants after nasal
administration in mice
Abstract
Background: Tuberculosis (TB), a contagious disease caused by
Mycobacterium tuberculosis (M. tuberculosis), remains a health problem
worldwide and this infection has the highest mortality rate among
bacterial infections. Current studies suggest that intranasal
administration of new tuberculosis vaccines could enhance the
immunogenicity of M. tuberculosis antigens. Hence, we aim to evaluate
the protective efficacy and immunogenicity of HspX/EsxS fusion protein
of M. tuberculosis along with ISCOMATRIX and PLUSCOM nano-adjuvants and
MPLA through the intranasal administration in mice model. Methods: in
present study, the recombinant fusion protein was expressed in
Escherichia coli and purified and used to prepare different nanoparticle
formulations in combination with ISCOMATRIX and PLUSCOM nano-adjuvants
and MPLA. Mice were intranasally vaccinated with each formulation three
times at an interval of 2 weeks. Three weeks after final vaccination,
IFN-γ, IL-4. IL-17 and TGF-β concentration in supernatant of cultured
splenocytes of vaccinated mice as well as serum titers of IgG1 and IgG2a
and sIgA titers in nasal lavagewere determined. Results: According to
obtained results, intranasally vaccinated mice with formulations
containing ISCOMATRIX and PLUSCOM nano-adjuvants and MPLA could
effectively induced IFN-γ and sIgA responses. Moreover, both
HspX/EsxS/ISCOMATRIX/MPLA and HspX/EsxS/PLUSCOM/MPLA and their BCG
booster formulation could strongly stimulate the immune system and
enhance the immunogenicity of M. tuberculosis antigens. Conclusion: The
results demonstrate the potential of HspX/EsxS-fused protein in
combination with ISCOMATRIX, PLUSCOM and MPLA after nasal administration
in enhancing immune response against of M. tuberculosis antigens. Both
nanoparticles were good adjuvants in order to promote immunogenicity of
TB fused antigen. so, nasal immunization with these formulations, could
induce immune responses and considered as new TB vaccine or as BCG
booster.