Immunogenic effect of PLGA nanoparticles containing Klebsiella pneumoniae K2O1 capsule antigen against urinary tract infection in BALB/C mice

Klebsiella can cause urinary tract infections that is associated with drug resistance. Capsule production as a means of resistance can prevent host immune system responses. This study investigated the effect of a PLGA nanoparticles vaccine containing capsule antigen.

Vaccination of 20 mice with an age of 3-5 weeks (with a weight range of 22±18 g) was performed in four groups of capsules, PLGA, PLGA-capsule combination (PLGA+CPS) and control (PBS). In this study, the fabrication of nanoparticles was investigated by zetasizer and FITR tests. Microbial loading was also performed on the bladder.One-way analysis of variance and Tukey post hoc test were used for statistical analysis .

The results of confirmation tests of zetaiser showed that the nanoparticle size and the size of PLGA nanoparticles containing capsule antigen molecule were 178.7 and 159.4 nm, respectively.The result of FTIR and the shapes of the corresponding peaks confirmed the presence of antigen functional groups in the nanoparticle structure and the formation of ester bonds.The resut of FTIR test also indicates the success of PLGA nanoparticles containing capsule antigen , the results of microbial challenge showed that in the control and PLGA groups, due to the fact that PLGA nanoparticles vaccine contain capsule antigen were not used, a significant increase was observed in terms of the number of colonies compared to other groups  )p<0/05( .

PLGA nanoparticles containing capsule antigen molecules have a better ability than pure capsules and can significantly reduce tissue damage.