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. 1998 Mar;93(3):415–420. doi: 10.1046/j.1365-2567.1998.00411.x

Lysis-sensitive targets stimulate an elevation of cAMP in human natural killer cells.

M M Whalen 1, C B Green 1
PMCID: PMC1364092  PMID: 9640254

Abstract

Natural killer (NK) cells are lymphocytes that are capable of destroying tumour cells and virally infected cells (cytolysis) without prior sensitization. When cAMP is artificially elevated in NK cells, it is a potent inhibitor of their cytolytic function. We investigated whether NK-cell cAMP levels are modulated in response to tumour target cells to determine the potential of cAMP as a physiological regulator of NK cytotoxic function. When NK cells are exposed to a range of lysis-sensitive (LS) tumour-target cells there is an increase in intracellular cAMP levels in the NK cells over a 60-min period. The peak increase in cAMP (200-400% above control) occurs at 30 min for all LS targets tested. There is no increase in NK-cell cAMP in response to lysis-resistant (LR) tumour-target cells. The cAMP elevation may be dependent on both LS-target-stimulated adenylyl cyclase (AC) activation and LS-target-stimulated phosphodiesterase (PDE) inhibition. When the NK cells are pretreated with the protein tyrosine kinase (PTK) inhibitor, genistein (30 micrograms/ml), the AC-activation component of the cAMP elevation is abolished. Thus, the AC-activation component appears to require PTK activation. When NK cells are pretreated with the protein kinase C (PKC) inhibitor, chelerythrine chloride (10 microM) the cAMP elevation in response to LS targets was not diminished. This indicates that neither the AC-activation component nor any PDE-inhibition component require PKC activation.

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Selected References

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