title: Piperlongumine, a constituent of Piper longum L., inhibits rabbit platelet aggregation as a thromboxane A(2) receptor antagonist.
abstract: Piper longum L. has been used as a crude drug for the treatment of the disorder of peripherally poor blood circulation in Asia. In the present study, we examined the effect of piperlongumine, a constituent of P. longum L., on rabbit platelet aggregation. Piperlongumine concentration-dependently inhibited platelet aggregation induced by thromboxane A(2) receptor agonist U46619, but it only slightly inhibited thrombin-induced one. Piperlongumine also inhibited U46619-induced phosphatidylinositol hydrolysis and the binding of [(3)H]SQ29548 to thromboxane A(2) receptor with a similar concentration-dependency to the aggregation. It is assumed that piperlongumine inhibits platelet aggregation as a thromboxane A(2) receptor antagonist.
authors.affiliation: Department of Cellular Signaling, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Masaya
authors.initials: M
authors.lastname: Iwashita
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Oka
authors.forename: Satoko
authors.initials: S
authors.lastname: Ohkubo
authors.forename: Masaki
authors.initials: M
authors.lastname: Saito
authors.forename: Norimichi
authors.initials: N
authors.lastname: Nakahata
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid / Q000494:pharmacology; D000818:Animals; D019086:Bridged Bicyclo Compounds, Heterocyclic; D004148:Dioxolanes / Q000494:pharmacology*; D005231:Fatty Acids, Unsaturated; D006573:Heterocyclic Compounds, 1-Ring / Q000494:pharmacology*; D006834:Hydrazines / Q000494:pharmacology; D008297:Male; D010716:Phosphatidylinositols / Q000378:metabolism; D031701:Piper / Q000737:chemistry*; D010974:Platelet Aggregation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology*; D011817:Rabbits; D044244:Receptors, Thromboxane A2, Prostaglandin H2 / Q000819:agonists / Q000037:antagonists & inhibitors*; D010881:Piperidones
chemical_list: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D019086:Bridged Bicyclo Compounds, Heterocyclic; D004148:Dioxolanes; D005231:Fatty Acids, Unsaturated; D006573:Heterocyclic Compounds, 1-Ring; D006834:Hydrazines; D010716:Phosphatidylinositols; D010975:Platelet Aggregation Inhibitors; D044244:Receptors, Thromboxane A2, Prostaglandin H2; C045749:SQ 29548; C498077:piperlongumine; D010881:Piperidones