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. 1993 Aug;79(4):542–547.

Phospholipase C activation in the cytotoxic response of human natural killer cells requires protein-tyrosine kinase activity.

M M Whalen 1, R N Doshi 1, Y Homma 1, A D Bankhurst 1
PMCID: PMC1421930  PMID: 8406578

Abstract

Treatment of highly purified natural killer (NK) cells with the protein-tyrosine kinase (PTK) inhibitors, genistein and herbimycin A, diminished their ability to lyse K562 target cells by as much as 100%. The ability of NK cells to bind to K562 cells was not affected by PTK inhibition. However, activation of phospholipase C (PLC) in response to K562 cell binding (as measured by inositol phosphate turnover) was decreased by as much as 75% when PTK activity was inhibited. Furthermore, there was an increase in tyrosine phosphorylation of NK cell PLC gamma 2 after exposure to K562 target cells. These data indicate that a PTK is involved in the activation of NK PLC by tumour target cells in the cytotoxic response.

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Selected References

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