title: Influence of a selective 5HT1-receptor agonist GR43175 on platelet responsiveness.
abstract: The possible interaction of sumatriptan, a selective 5HT1-receptor agonist, with platelet responsiveness has been investigated. Stimulation of platelet rich plasma with sumatriptan (1-100 microM) did not induce shape change, aggregation or modification of intraplatelet cytosolic calcium levels. Total inhibition of aggregation induced by 20 microM 5HT was observed in platelets preincubated for 20 min with 100 microM sumatriptan. In the same model, platelet stimulation with 4 microM adenosine 5'-diphosphate (ADP), concentration known to induce an irreversible single-phase curve, determined a decrease of aggregatory response. Concentrations from 1 microM to 50 microM of sumatriptan did not influence the aggregatory response induced by 5HT and ADP. These effects appear not to be determined by modifications of platelet calcium homeostasis. The possibility to modulate platelet responsiveness by sumatriptan offers a further approach for evaluating the probable link between platelet behaviour and pathophysiology of migraine.
authors.affiliation: Laboratory of Applied Physiology, University of L'Aquila, Italy.
authors.forename: M G
authors.initials: MG
authors.lastname: Tozzi-Ciancarelli
authors.forename: C
authors.initials: C
authors.lastname: Di Massimo
authors.forename: E
authors.initials: E
authors.lastname: Tozzi
authors.forename: A
authors.initials: A
authors.lastname: Mascioli
authors.forename: G
authors.initials: G
authors.lastname: De Matteis
authors.forename: A
authors.initials: A
authors.lastname: Carolei
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D000328:Adult; D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism; D048429:Cell Size / Q000187:drug effects; D006801:Humans; D008297:Male; D010974:Platelet Aggregation / Q000187:drug effects*; D012016:Reference Values; D012701:Serotonin / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*; D018170:Sumatriptan / Q000494:pharmacology*
chemical_list: D017366:Serotonin Receptor Agonists; D012701:Serotonin; D000244:Adenosine Diphosphate; D018170:Sumatriptan