title: [Thrombocyte function in essential thrombocythemia and reactive thrombocytosis].
abstract: Blood of 16 patients with essential thrombocythemia (ET), 9 patients with reactive thrombocytosis (RT) and 13 healthy persons was used for platelet aggregation studies. When the aggregation was induced with adenosine diphosphate (0.01 microM), collagen (0.1 micrograms/ml) or platelet activating factor (PAF 0.5 microM) the plasma of the patients with ET showed significantly decreased aggregation (35%-44% of the value for the control groups). Independent of inhibitors of platelet aggregation, thrombin (0.05 U/ml) caused similar aggregation in healthy controls and patients with ET; patients with RT showed an increase aggregation. Adrenalin-induced aggregation discriminated best between patients with ET and controls. Adrenalin in concentrations ranging from 0.01 micrograms/ml to 100 micrograms/ml caused comparable dose-related amounts of aggregation in healthy controls and patients with RT. Over the whole concentration range, patients with ET showed significantly decreased aggregation (28%-34% of the value for the control groups). This difference proved to be independent of the influence of inhibitors of platelet aggregation. Though concentrations of alpha1-acid glycoprotein never reached inhibitory levels in the plasma of patients with ET (n = 12) they were significantly higher compared with those in normal plasma (n = 12). Fibrinogen concentrations in plasma of ET-patients (n = 12) were in the normal range. Cellular adenosine 3'-5'-cyclic monophosphate concentrations in ET (n = 10) are comparable with normal values (n = 5). The significance of the results for diagnosis and better pathophysiological understanding of ET is discussed.
authors.affiliation: Medizinische Poliklinik der Universität München.
authors.forename: B
authors.initials: B
authors.lastname: Baumann
authors.forename: I
authors.initials: I
authors.lastname: Hillmar
authors.forename: R
authors.initials: R
authors.lastname: Hehlmann
mesh_terms: D001792:Blood Platelets / Q000378:metabolism; D000242:Cyclic AMP / Q000097:blood; D005340:Fibrinogen / Q000378:metabolism; D006801:Humans; D009961:Orosomucoid / Q000378:metabolism; D010974:Platelet Aggregation; D010976:Platelet Count; D010979:Platelet Function Tests; D013920:Thrombocythemia, Essential / Q000097:blood*; D013922:Thrombocytosis / Q000097:blood*
chemical_list: D009961:Orosomucoid; D005340:Fibrinogen; D000242:Cyclic AMP
vernacular_title: Untersuchungen zur Thrombozytenfunktion bei essentieller Thrombozythämie und reaktiver Thrombozytose.