Abstract
The non-differentiated HL60 cell can be stimulated to secrete when Ca2+ and guanosine 5'-[gamma-thio]-triphosphate (GTP gamma S) are introduced into streptolysin-O-permeabilized cells. Secretion is accompanied by activation of polyphosphoinositide phosphodiesterase (PPI-pde). Both responses show a concentration-dependence on Ca2+ between pCa 8 and pCa 5. The half-maximal requirements for Ca2+ for PPI-pde activation and secretion are pCa 6.4 +/- 0.1 and pCa 6.2 +/- 0.2 respectively. The rank order of potency of the GTP analogues to stimulate PPI-pde activation and secretion is similar; GTP gamma S greater than guanosine 5'-[beta gamma-imido]-triphosphate greater than guanosine 5'-[beta gamma-methylene]triphosphate greater than XTP approximately equal to ITP, but the maximal response achieved by each compound compared with GTP gamma S is much greater for secretion than for PPI-pde activation. A dissociation of the two responses is obtained with 10 mM-XTP and -ITP; secretion is always observed but not inositol trisphosphate formation at this concentration. GTP, dGTP, UTP and CTP are inactive for both secretion and PPI-pde activation. Both GDP and dGDP are competitive inhibitors of both GTP gamma S-induced secretion and PPI-pde activation. Phorbol 12-myristate 13-acetate could not fully substitute for GTP gamma S in stimulating secretion, suggesting that the effect of GTP gamma S cannot result simply from the generation of diacylglycerol. In the absence of MgATP, secretion and PPI-pde activation is still evident, albeit at a reduced level. This also supports the hypothesis that protein kinase C-dependent phosphorylation is not essential for secretion. The effect of MgATP is to enhance secretion, and to reduce both the Ca2+ and GTP gamma S requirement for secretion. In conclusion, two roles for guanine nucleotides can be identified; one for activating PPI-pde (GP) and the other for activating exocytosis (GE), acting in series.
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Selected References
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