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. 1980 May;40(2):336–344.

Killing of juvenile Fasciola hepatica by purified bovine eosinophil proteins.

W P Duffus, K Thorne, R Oliver
PMCID: PMC1536974  PMID: 7438542

Abstract

Eosinophils were isolated from the mammary gland of Fasciola hepatica-infected cattle by intramammary infusion with a crude extract from adult F. hepatica. Up to 5 x 10(9) eosinophils with a purity of over 90% could be obtained from a single quarter of the gland. The major contaminating cells were monocytes which reached their peak several days following the eosinophil peak. Two major proteins were isolated from bovine eosinophil granules, a high molecular weight peroxidase-active protein and a smaller molecular weight predominantly basic protein. This smaller protein was thought to be the bovine equivalent of guinea-pig and human major basic protein (MBP), although it possessed an unusually high concentration of cysteine. The bovine MBP had a profound effect on juvenile F. hepatica in vitro causing damage and death at concentrations down to 1 x 10(-6) M. The damage was detected by a 51Cr release assay and/or a viability assay involving microscopical examination of the flukes. Other cations, especially protamine sulphate, were also shown to kill flukes, although both lysozyme, found in neutrophils, and the peroxidase-positive peak from bovine eosinophils were unable to mediate any detectable damage.

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Selected References

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