Immuno-protection of SJIR-2 DNA vaccine with microspheres adjuvant in mice challenged with Schistosoma japonicum
- VernacularTitle:日本血吸虫SJIR-2纳米微球核酸疫苗的免疫保护性研究
- Author:
Zhengyin WANG
;
Lihong PAN
;
Xuelong WANG
- Publication Type:Journal Article
- Keywords:
Schistosoma japonicum;
SJIR-2 gene;
nucleic acid vaccine;
poly(lactic-co-glycolic acid)
- From:
Acta Universitatis Medicinalis Anhui
2016;51(5):611-614
- CountryChina
- Language:Chinese
-
Abstract:
Objective To research the immuno-protection of SJIR-2 DNA vaccine with nanometer microspheres a-gainst Schistosoma japonicum infection in mice. Methods To construct eukaryotic expression plasmid pEGFP-SJIR-2, identified by double digestion and sequenced delivery. The recombinant plasmid pEGFP-SJIR-2 was ex-tracted and was encapsulated into PLGA nanometer microspheres which were modified by CHS. 40 female BALB/c mice were randomly divided into 4 groups (n=10), each group of mice were injected with PBS, empty pEGFP plasmid, CHS-PLGA nanometer microspheres and CHS-PLGA-pEGFP-SJIR-2 nanometer microspheres 100 μg, re-spectively. Two weeks after the last immunization, each mouse was infected by cercaria of Schistosoma japonicum, sera of mice in each group were collected before each immunization and challenge infection. ELISA was used to de-tect the change of IgG in each group of micesera. 42 days later, all mice were sacrificed. The adult worms and eggs were collected and counted, and the worm and egg reduction rates were calculated as well. Results The recombi-nant plasmid pEGFP-SJIR-2 was successfully constucted, and there was significant difference in the numbers of worm and egg between CHS-PLGA-pEGFP-SJIR-2 group and PBS group ( P<0. 01 ) . The worm andegg reduction rates in CHS-PLGA-pEGFP-SJIR-2 group were 37. 36% and 46. 82% respectively. The IgG levels in mice sera of CHS-PLGA-pEGFP-SJIR-2 group were remarkably higher (P<0. 01) compared with PBS group. On the contrary, there was no significant difference between both pEGFP plasmid group and CHS-PLGA group in the numbers of worm and egg compared with PBS group. Conclusion SJIR-2 nanometer microspheres nucleic acid vaccine has some immuno-protection against Schistosoma japonicum infection in BALB/c mice,while it is worth further studying for it’ s potential value to be a candidate antigen molecule of Schistosoma japonicum vaccine.
