ABSTRACT
Objective To evaluate the diagnostic value of the recombinant protein Sj_Ts4 in immunodiagnosis of Schistosomiasis japonica.Methods Seventy-four blood samples of schistosomiasis japonica patients(acute, chronic and advanced)were used for evaluating the sensitivity.Blood samples from 24 Clonorchiasis patients,8 patients with hookworm infections and 30 normal persons from the areas without Schistosomiasis were used ror patients.Results The positivity rates were 97.1%(33/34),100.0%(16/16),87.5%(21/24)in rSj-Ts4-ELISA and 100%(34/34),100.0%(16/16),75.0%(18/24)in SjAWA-ELISA in acute,chmnic and advanced Schistosomiasis. respectively.Statistical analysis revealed no significant difference in sensitivity(X2=1.23,P＞0.05)between both recombinant and crude antigens.The false positive reaction was found to be 6.7%(2/30)in rSj-Ts4-ELISA and 3.3%(1/30)in SjAWA-ELISA when detected in 30 cases of normal control sera.but no statisticallv significant difference was noted(x2=0.35,P＞0.05).Twelve point five percent(3/24),20.8%(5/24)and 12.5%(1/8),37.5% (3/8),of cross-reactions were observed between rSj-Ts4-ELISA and SjAWA-ELISA for detecting the sera of patients with clonorehiasis and hookworms.There was no significant difference of cross-reaction in two parasitic infections (x2=0.60,1.33,P＞0.05)with the two tests.Conclusions The rSj-Ts4 antigen shows higher sensitivity and specificity for the diagnosis of Schistosomiasis japonica,which is helpful in the serological diagnosis of Schistosomiasis japonica in endemic areas.
ABSTRACT
Objective To express Schistosoma japonicum Mago nashi(SjMago)gene,and prepare its specific polyclonal antibody.Methods SjMago gene was amplified by PCR from Schistosomulum cDNA library and subcloned into pET28a(+)vector,its recombinant proteins were expressed with IPTG.Rabbits were immunized with the polyacrylamide gel particles containing the recombinant proteins for polyclonal antibody preparation,the sera were detected for antibody specificity by Western blot and titer by ELISA assay.Results SjMago prokaryotic expression plasmid was successfully recombined and the target proteins was induced by IPTG in a molecular weight of 17 X 103，the high titer(1∶40 960)polyclonal antibody was isolated from the immunized rabbit，specific rotein band was detected by Western blot.Conclusion SjMago protein has been successfully expressed and its specific polyantibody is prepared,which lays the foundation for further study.