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. 1990 May;80(2):247–251. doi: 10.1111/j.1365-2249.1990.tb05242.x

Dual mechanism in induction of human neutrophil cytotoxicity: activation of protein kinase C and elevation in intracellular calcium.

R Gavioli 1, S Spisani 1, A L Giuliani 1, S Traniello 1
PMCID: PMC1535296  PMID: 2357853

Abstract

Human neutrophils can damage the non-immunized K562 cell line when stimulated by phorbol myristate acetate (PMA). The combination of the activation of protein kinase C by phorbol and the increase of free intracellular calcium by ionophore potentiates the lytic reaction. The OKT9-immunized target cells are not able to induce by themselves the lytic response in neutrophils, but by combining the two signals, the antigenic stimulus and PMA, a high level of cytolytic response is attained. The addition of EGTA does not affect neutrophil cytotoxicity against antibody-coated targets, while it markedly reduced the lytic reaction against non-immunized targets; in contrast, the addition of EGTA together with the ionophore ionomycin completely suppresses the lysis of immunized and non-immunized targets. The treatment of neutrophils with the protein kinase C inhibitor H-7 causes a dose-related inhibition of the lytic functions that is greater on unsensitized K562. Thus the interaction of Fc receptors with immunized targets is required for reaching the maximal cytolysis. The enhanced lytic activity that occurs in the presence of immunized targets is mediated by calcium flux, as detected by using the monoclonal antibody AB8.28 which binds to FcIII receptors (FcRIII), thus supporting that both signals are involved.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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