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. 1999 Dec 15;344(Pt 3):921–928. doi: 10.1042/0264-6021:3440921

Different roles of protein kinase C alpha and delta isoforms in the regulation of neutral sphingomyelinase activity in HL-60 cells.

D Visnjić 1, D Batinić 1, H Banfić 1
PMCID: PMC1220717  PMID: 10585882

Abstract

The signalling mechanisms responsible for the hydrolysis of sphingomyelin mediated by 1,25-dihydroxyvitamin D(3) [1, 25(OH)(2)D(3)] and interferon gamma (IFN-gamma) in HL-60 cells were investigated. IFN-gamma was found to increase selectively the activity of cytosolic, Mg(2+)-independent, neutral sphingomyelinase. The treatment of HL-60 cells with the combination of 1,25(OH)(2)D(3) and IFN-gamma had an additive effect on sphingomyelin hydrolysis, ceramide release and the activity of cytosolic, Mg(2+)-independent, neutral sphingomyelinase. The pretreatment of HL-60 cells with staurosporine, chelerythrine chloride and bisindolylmaleimide abolished the activity of sphingomyelinase in response to 1,25(OH)(2)D(3) and IFN-gamma. Calphostin C, which acts on the regulatory site of protein kinase C (PKC), and Gö 6976, a selective inhibitor of Ca(2+)-dependent PKC isoforms, inhibited the effect of 1,25(OH)(2)D(3) but had no effect on the IFN-gamma-mediated increase in activity of sphingomyelinase. Isoform-specific antibodies were used to deplete different PKC isoforms from cytosol before the treatment of the cytosolic fraction with 1,25(OH)(2)D(3), arachidonic acid (AA) and PMA. The depletion of PKC isoforms beta(1), beta(2), epsilon, eta, mu, zeta and lambda had no effect on the activation of sphingomyelinase induced by 1,25(OH)(2)D(3) or by AA. The depletion of PKC alpha from the cytosol completely abolished the effect of 1,25(OH)(2)D(3) on sphingomyelinase activity but had no effect on the AA-induced activity of sphingomyelinase. PMA had no effect on the activity of sphingomyelinase in either untreated or alpha-depleted cytosol but significantly increased the activity of sphingomyelinase when added to cytosol depleted of PKC delta. Moreover, PMA inhibited the effect of 1,25(OH)(2)D(3) on sphingomyelinase activation but the inhibitory effect was abolished by prior depletion of PKC delta from the cytosol. These studies demonstrate that 1,25(OH)(2)D(3)-induced activation of sphingomyelinase is mediated by PKC alpha. Furthermore, PKC delta had an inhibitory effect on sphingomyelinase, suggesting that the difference between the 1,25(OH)(2)D(3)- and PMA-mediated effects on sphingomyelin turnover depends on the specific regulation of the PKC alpha and PKC delta isoforms.

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Selected References

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