title: Fructose-1,6-diphosphate inhibits platelet activation.
abstract: Fructose-1,6-diphosphate (FDP) is a physiological product which exhibits pharmacological properties. This study shows that FDP (1-3 mM) inhibits platelet aggregation induced by the agonists thrombin, vasopressin, platelet activating factor, ADP, adrenaline, arachidonate and the stable thromboxane analogue U 44069. Thrombin-promoted ATP secretion and cytosolic Ca2+ rise are also drastically inhibited by FDP, which decreases, although to a lesser extent, the protein kinase C-dependent phosphorylation of the 47 kDa protein. The inhibition on thrombin-induced aggregation is shared, albeit less efficiently, by glucose-1,6-diphosphate and fructose-2,6-diphosphate but not by other phosphorylated monosaccharides (fructose-1:2 cyclic,6-diphosphate, glucose-1- and glucose-6-phosphate, fructose-1- and fructose-6-phosphate, mannose-6-phosphate and 5-phosphoryl ribose-1-pyrophosphate). FDP does not affect platelet activation induced by the protein kinase C activators dioctanoylglycerol or phorbol 12-myristate 13-acetate. No increase of cAMP concentration is observed in FDP-treated platelets. Altogether, these results indicate that FDP inhibits platelet activation at a level preceding phospholipase C. The data are consistent with a general inhibitory action of FDP on signal transmission.
authors.affiliation: Department of Biological Chemistry, C.N.R. University of Padova, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Cavallini
authors.forename: R
authors.initials: R
authors.lastname: Deana
authors.forename: M A
authors.initials: MA
authors.lastname: Francesconi
authors.forename: A
authors.initials: A
authors.lastname: Alexandre
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D002118:Calcium / Q000378:metabolism; D000242:Cyclic AMP / Q000378:metabolism; D004837:Epinephrine / Q000494:pharmacology; D005635:Fructosediphosphates / Q000494:pharmacology*; D006801:Humans; D010766:Phosphorylation / Q000187:drug effects; D015539:Platelet Activation / Q000187:drug effects*; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology*; D013917:Thrombin / Q000494:pharmacology
chemical_list: D005635:Fructosediphosphates; D010975:Platelet Aggregation Inhibitors; D000255:Adenosine Triphosphate; D000242:Cyclic AMP; D013917:Thrombin; C029063:fructose-1,6-diphosphate; D002118:Calcium; D004837:Epinephrine