Production of monoclonal antibodies against cysteine protease 5 of Entamoeba histolytica

Objective. Obtain mouse monoclonal antibodies against cysteine proteases 5 (EhCP5) of Entamoeba histolytica. Materials and methods. BALB/c mice were immunized intraperitoneally with complete and incomplete Freund adjuvant EhCP5 with the recombinant EhCP5 protein obtained from E.coli DH5α culture transfected with the recombinant vector pJC45 that expresses said protein. The animal with the best antibody response was selected. Its spleen was extracted as a source of B-lymphocytes, which were merged using PEG miceSP2-0/Ag14 myeloma cells. The team proceeded to undergo the selection of the hybridomas and the evaluation of the supernatants of the colonies that grew after 7 days by ELISA. The hybridomas with higher values of specific antibodies against the protein EhCP5r were selected, and clones obtained by limiting dilution were expanded Results. With the use of a stable secreting clone the monoclonal antibody anti EhCP5r IgG1 isotype was purified by affinity chromatography with protein G. The clones were expanded in vivo andin vitro. Three capture systems were designed with the purified antibody to assess the applicability of the monoclonal antibody anti EhCP5r as an immunodiagnostic method. Conclusions. The production of a specific monoclonal antibody against EhCP5r was achieved to differentiate Entamoeba histolytica from Entamoeba dispar.