Preparation and identification of monoclonal antibodies against Echinococcus granulosus hydatid cyst fluid antigen

: McAbs were prepared by fusing SP2/0 cells with spleen cells of BALB/c mice immunized with hydatid cyst fluid (HCF) antigen. Antibodies in hybrid culture supernatant were detected by ELISA, and positive hybrids were cloned by technique of limiting dilutions. Numbers of chromosomes of five hybridoma cell lines (1D1, 1D8, 2D6, 4B10, 4F4) were demonstrated in the range of 99-108. The immunoglobulin class/subclass of McAb 4F4 was IgM and the others belonged to IgG1. IHA, ELISA and I-ELISA were used for identifying titer and specificity of five McAbs. The titers of two McAbs (1D1, 1D8) reached 1:10(6)-10(7) in IHA and ELISA. Two of these McAbs (1D1, 4F4) with other parasitic antigens revealed cross-reactions. This indicated that the McAbs 1D1 and 4F4 were against common antigen determiners of different parasitic antigens and the McAbs 1D8, 2D6, 4B10 against specific antigen determiners of HCF.