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Neutrophils from naive rats lysed low numbers of Acanthamoeba castellanii in the presence of normal rat serum and significantly higher numbers of the parasite in the presence of serum from immunized rats. With normal rat serum, neutrophils from rats immunized with crude parasite extract or from naive rats killed similar percentages of A. castellanii. However, neutrophils from immunized rats killed a significantly greater percentage of parasites in the presence of serum from immunized rats than was seen with any other combination of serum and neutrophils. The addition of supernatant from cultures of concanavalin A-stimulated rat spleen cells to incubations of the parasite in the presence of neutrophils from naive or immunized rats and immune serum resulted in the highest levels of amoebolysis seen in this study. This study has shown that neutrophils from naive rats or from rats immunized with A. castellanii antigen display a very limited amoebolytic capability which is significantly augmented in the presence of serum from immunized rats and further boosted by the addition of supernatant from Con A-stimulated rat spleen cell cultures.
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