Specific antibody to calpain induces schistosomulicidal activity of Schistosoma japonicum in vitro / 中华传染病杂志

ABSTRACT

Objective To explore the efficacy and protective mechanism of calpain, a calcium activated neutral proteinase as a vaccine candidate molecule. Methods Anti calpain sera were prepared by immunized BALB/c mice with recombinant calpain. Anti calpain sera, schistosomula of Schistosoma japonicum , and mouse eosinophils were incubated at 37 ?C , 5% CO 2 for 48 hours, and the adherence of eosinophils to schistosomula and its schistosomulacidal efficacy were observed. Results Mice immunized with recombinant calpain produced a high level IgG antibodies specific to the antigen immunized. Immunoblotting analysis showed murine anti recombinant calpain sera bound specifically to recombinant calpain. Ninety six percent of schistosomula were surrounded by cells when incubated with mouse eosinophils, and a significant number of dead schistosomula was observed at 48 hours when incubated with mouse serum and eosinophils as compared with control serum and eosinophils ( P