title: Increased in vivo biosynthesis of prostacyclin and thromboxane A2 in chronic idiopathic thrombocytopenic purpura.
abstract: The production of thromboxane A2 (TxA2) and prostacyclin (PGI2) was studied in patients with chronic idiopathic thrombocytopenic purpura (10 patients) compared to central thrombocytopenia (five patients) and healthy subjects (10 subjects). This production was monitored by the assay of urinary 2,3-dinor-TxB2 and 2,3-dinor-6-keto-PGF1 alpha as respective breakdown products of TxA2 and PGI2 by stable isotope dilution assays employing negative ion-chemical gas-chromatography-mass-spectrometry. Evidence is presented for the existence of an enhanced PGI2 and TxA2 urinary excretion in the group of idiopathic thrombocytopenic purpura (ITP) patients. Moreover, production of serum TxB2 per platelet was decreased in ITP group. These results provide arguments for an in vivo platelet cyclooxygenase hyperactivity during chronic ITP.
authors.affiliation: Laboratoire d'Hémobiologie, Institut Pasteur, Faculté de Médecine A. Carrel, INSERM 205, Lyon, France.
authors.forename: D
authors.initials: D
authors.lastname: Rousson
authors.forename: M
authors.initials: M
authors.lastname: Guichardant
authors.forename: M
authors.initials: M
authors.lastname: Lagarde
authors.forename: J J
authors.initials: JJ
authors.lastname: Viala
authors.forename: M
authors.initials: M
authors.lastname: Dechavanne
mesh_terms: D015121:6-Ketoprostaglandin F1 alpha / Q000031:analogs & derivatives / Q000652:urine; D000328:Adult; D011464:Epoprostenol / Q000096:biosynthesis*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010976:Platelet Count; D011446:Prospective Studies; D011696:Purpura, Thrombocytopenic / Q000378:metabolism*; D013921:Thrombocytopenia / Q000378:metabolism; D013928:Thromboxane A2 / Q000096:biosynthesis*; D013929:Thromboxane B2 / Q000031:analogs & derivatives / Q000097:blood / Q000652:urine
chemical_list: D013929:Thromboxane B2; D013928:Thromboxane A2; D015121:6-Ketoprostaglandin F1 alpha; C028965:2,3-dinor-thromboxane B2; C028290:2,3-dinor-6-ketoprostaglandin F1alpha; D011464:Epoprostenol