title: [Mechanisms of the protease-induced aggregation of human platelets].
abstract: The role of phospholipase C (an enzyme involved in the metabolism of inositol-containing phospholipids), cyclooxygenase and lipoxygenase (the enzymes of arachidonic acid metabolism), and adenylate cyclase and phosphodiesterase (the enzymes of cyclic adenosine 3,5-monophosphate (cAMP) metabolism) in the mechanisms of the aggregation of human platelets induced by the serine protease in low concentrations (thrombin 0.5 mkg per ml, trypsin 1 mkg per ml, and alpha-chymotrypsin 10 mkg per ml) have been investigated with the use of the inhibitor analysis. The effect of neomycin sulfate (phospholipase C inhibitor), indometacin (cyclooxygenase inhibitor), and nordihydrogvayaretic acid (lipoxygenase inhibitor) on protease-induced increase in the content of calcium cations in platelet plasma has been studied. The results of the inhibitor analysis indicated that the enzymes of metabolism of inositol-containing phospholipids, arachidonic acid, and cAMP are involved in the mechanisms of the protease-induced platelet aggregation. The increase in the content of calcium ions, associated with the protease-induced activation of phospholipase C, in cytoplasm may play an important role in the mechanisms of platelet aggregation.
authors: T S
authors: TS
authors: Chernovets
authors: V N
authors: VN
authors: Mazhul'
mesh_terms: D016718:Arachidonic Acid / Q000378:metabolism; D001792:Blood Platelets / Q000166:cytology / Q000201:enzymology*; D002118:Calcium / Q000378:metabolism; D000242:Cyclic AMP / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D010743:Phospholipids / Q000378:metabolism; D010974:Platelet Aggregation / Q000187:drug effects / Q000502:physiology*; D015290:Second Messenger Systems / Q000187:drug effects / Q000502:physiology*; D012697:Serine Endopeptidases / Q000494:pharmacology*; D010738:Type C Phospholipases / Q000037:antagonists & inhibitors / Q000378:metabolism*
chemical_list: D004791:Enzyme Inhibitors; D010743:Phospholipids; D016718:Arachidonic Acid; D000242:Cyclic AMP; D010738:Type C Phospholipases; D012697:Serine Endopeptidases; D002118:Calcium