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. 1979 Apr;76(4):1873–1877. doi: 10.1073/pnas.76.4.1873

Inhibitors of membrane transport reduce lysosomal enzyme secretion from dogfish phagocytes and their killing of sea urchin eggs

Philip Dunham *,†,‡, Peter Arvan *, Stephen Falkow *, Sylvia Hoffstein §, Gerald Weissmann *,§
PMCID: PMC383494  PMID: 377288

Abstract

Blood phagocytes of the dogfish Mustelus canis attack oocytes of the sea urchin Arbacia punctulata, first provoking a surrogate fertilization response and then killing the eggs. To test the hypothesis that secretion of lysosomal contents is critical in this model of phagocyte-mediated cell injury, we studied effects of agents that modify lysosomal enzyme secretion. Inhibitors of membrane transport (>0.1 mM) inhibited postphagocytic secretion of lysosomal β-glucuronidase from dogfish phagocytes: phloretin > ethacrynate > furosemide > 4-acetamido-4′-isothiocyanostilbene-2,2′-disulfonic acid >> pyridoxal phosphate > ouabain. The same order of activity was found for inhibition by these agents of killing of Arbacia eggs by phagocytes. Cell activation (fertilization response) and cytotoxicity were quantitated both morphologically and by measurements of enzyme (β-glucuronidase, catalase) release. The agents neither inhibited fertilization responses of eggs to calcium ionophore A23187 nor impaired their viability. Vital staining demonstrated that ethacrynate prevented phagocytes from degranulating upon contact with zymosan particles. The data not only suggest that agents primarily known for their capacity to inhibit membrane transport systems can inhibit lysosomal enzyme secretion from phagocytes but also support the hypothesis that secretion of lysosomal contents mediates activation and killing of target cells in phagocyte-mediated tissue injury.

Keywords: cytotoxicity, degranulation, ethacrynic acid, furosemide, phloretin

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Selected References

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