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. 1989 Nov;68(3):341–345.

Generation and characterization of monoclonal antibodies against Giardia muris trophozoites.

M F Heyworth 1, K E Ho 1, J Pappo 1
PMCID: PMC1385445  PMID: 2592009

Abstract

Mouse monoclonal antibodies (mAb) were produced against Giardia muris trophozoite surface antigens. To generate B-cell hybridomas, P3/NS1/1-Ag4-1 myeloma cells were fused with splenic lymphocytes from BALB/c mice that had been immunized parenterally with G. muris trophozoites. Hybridoma culture supernatants were screened for mAb by flow cytometry of G. muris trophozoites incubated with culture supernatant followed by fluorescein-conjugated anti-mouse IgG and IgM. Flow cytometry showed three types of trophozoite staining by mAb: (i) bright staining of greater than 90% of trophozoites, with aggregation of the organisms; (ii) bright staining of approximately 90% of trophozoites, with little or no aggregation; (iii) dull staining of approximately 20% of trophozoites, without aggregation. Western blotting of mAb on G. muris trophozoite antigens separated by polyacrylamide gel electrophoresis showed that a mAb exhibiting the third of these flow cytometry staining patterns recognized trophozoite antigens of MW approximately 31,000 and 35,000. Immunoprecipitation studies indicated that the same mAb specifically precipitated two 125I-labelled trophozoite surface antigens of MW approximately 30,000. Monoclonal antibodies generated in this study may facilitate the purification and biochemical characterization of trophozoite antigens that are targets for protective intestinal antibody in G. muris-infected mice.

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Selected References

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