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. 1990 Mar;69(3):435–442.

Release of leukotriene C4 (LTC4) from human eosinophils following adherence to IgE- and IgG-coated schistosomula of Schistosoma mansoni.

R Moqbel 1, A J Macdonald 1, O Cromwell 1, A B Kay 1
PMCID: PMC1385964  PMID: 2312166

Abstract

The release of leukotriene C4 (LTC4) from human low-density eosinophils following adherence to live or formalin-fixed schistosomula of Schistosoma mansoni coated with parasite-specific IgE or IgG obtained from pooled human anti-S. mansoni serum has been studied. IgE-rich fractions were obtained after fractionation of pooled immune sera on fast-protein liquid chromatography (FPLC; polyanion SI-17 column) and were identified by parasite-specific RAST. Contaminating IgG was removed by adsorption on a Staphylococcus aureus-protein A affinity column. IgG-rich FPLC fractions were identified by a specific ELISA assay. IgG-dependent activities were confirmed by protein A adsorption. Low-density eosinophils adhered to live and formalin-fixed schistosomula coated with specific antisera and released 11.7 +/- 2.7 and 16.5 +/- 3.5 pmoles of LTC4/10(6) cells, respectively. LTC4 release induced by A23187 (5 x 10(-6) M) from the same cells was 80 +/- 24 pmoles/10(6) cells and 9.9 +/- 1 pmoles/10(6) cells in the presence of Sepharose particles (CNBr-activated 4B beads) covalently coated with normal human IgG. Fixed schistosomula coated with FPLC-purified IgE and IgG gave 7.6 +/- 0.4 and 6.0 +/- 0.1 pmoles of LTC4 per 10(6) low-density eosinophils, respectively. The same IgE- and IgG-rich fractions induced eosinophil-mediated cytotoxicity of live schistosomula in vitro. Removal of IgE by an anti-IgE affinity column abolished both the IgE-dependent release of LTC4 and the in vitro killing of larvae. Conversely, IgG-dependent activities were abolished by protein A, but not anti-IgE, adsorption. Normal density eosinophils generated undetectable amounts of LTC4 when incubated with IgE-coated schistosomula, whereas with IgG-coated larvae 4.6 pmoles/10(6) cells were obtained. Following preincubation with platelet-activating factor (PAF) (10(-7) M) and leukotriene B4 (LTB4) (10(-7) M), normal density eosinophils released LTC4 when in contact with larvae coated with antigen-specific IgE. Lyso-PAF had no effect in any of the systems tested. The synthetic chemotactic tripeptide formyl-methionyl-leucyl-phenylalanine (FMLP) had no influence on IgE-dependent release of LTC4 from eosinophils. In contrast, FMLP (10(-7) M) enhanced the IgG-dependent LTC4 release, with PAF and LTB4 also showing a small enhancing effect. None of these agents substantially altered the release potential of low-density eosinophils in either IgE- or IgG-dependent events. Thus the results presented here indicate that in an IgE-dependent system, human low-density eosinophils can be induced to adhere to and kill IgE-coated helminthic targets and release biologically relevant amounts of LTC4.(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

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