Abstract
The tyrosine kinase inhibitors ST271, ST638 and erbstatin inhibited phospholipase D (PLD) activity in human neutrophils stimulated by fMet-Leu-Phe, platelet-activating factor and leukotriene B4. These compounds did not inhibit phorbol ester-stimulated PLD, indicating that they do not inhibit PLD per se, but probably act at a site between the receptor and the phospholipase. In contrast, the protein kinase C inhibitor Ro-31-8220 inhibited phorbol 12,13-dibutyrate- but not fMet-Leu-Phe-stimulated PLD activity, arguing against the involvement of protein kinase C in the receptor-mediated activation of PLD. ST271 did not inhibit Ins(1,4,5)P3 generation, but did inhibit protein tyrosine phosphorylation stimulated by fMet-Leu-Phe. The phosphotyrosine phosphatase inhibitor pervanadate increased tyrosine phosphorylation and stimulated PLD. These results suggest that tyrosine kinase activity is involved in receptor coupling to PLD but not to PtdIns(4,5)P2-specific phospholipase C in the human neutrophil.
MeSH Terms
Enzyme Activation
Humans
Indoles
N-Formylmethionine Leucyl-Phenylalanine/pharmacology
Neutrophils/drug effects,enzymology
Phorbol 12,13-Dibutyrate/pharmacology
Phosphatidylinositol Diacylglycerol-Lyase
Phospholipase D/metabolism
Phosphoric Diester Hydrolases/metabolism
Phosphorylation
Phosphotyrosine
Protein Kinase C/antagonists & inhibitors,pharmacology
Protein-Tyrosine Kinases/metabolism
Receptors, Cell Surface/physiology
Type C Phospholipases/metabolism
Tyrosine/analogs & derivatives,metabolism
Chemicals
Indoles
Receptors, Cell Surface
Phosphotyrosine
Phorbol 12,13-Dibutyrate
Tyrosine
N-Formylmethionine Leucyl-Phenylalanine
Protein-Tyrosine Kinases
Protein Kinase C
Phosphoric Diester Hydrolases
Type C Phospholipases
Phospholipase D
Phosphatidylinositol Diacylglycerol-Lyase
Ro 31-8220
Authors & Affiliations
7 authors, click to expand affiliations / ORCID
Uings I J
Cell Signalling Group, Biochemical Sciences, Wellcome Research Laboratories, Kent, U.K.
Thompson N T
Randall R W
Spacey G D
Bonser R W
Hudson A T
Garland L G
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