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Familial and constitutional bleeding disorder due to platelet cyclo‐oxygenase deficiency
Author(s) -
Horellou M. H.,
Lecompte T.,
Lecrubier C.,
Fouque F.,
Chignard M.,
Conard J.,
Vargaftig B. B.,
Dray F.,
Samama M.
Publication year - 1983
Publication title -
american journal of hematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.456
H-Index - 105
eISSN - 1096-8652
pISSN - 0361-8609
DOI - 10.1002/ajh.2830140102
Subject(s) - platelet , radioimmunoassay , ristocetin , thromboxane a2 , platelet aggregation , thrombin , chemistry , medicine , endocrinology
Three family members from two successive generations had a bleeding tendency. Their template bleeding time was prolonged and platelet aggregation induced by ADP and adrenaline showed no second wave; collagen at low to moderate concentrations failed to aggregate and release ATP, whereas higher amounts aggregated and released. Aggregation and release due to thrombin, ristocetin, and synthetic epoxy derivatives (U 44069 and U 46619) were normal. Arachidonate (AA) was inactive, and was not converted either in thromboxane (TX) A 2 activity evaluated on the rabbit aorta strip, nor in TXB 2 evaluated by radioimmunoassay and by radiochromatography. The parallel impairment of TXB 2 and PGE 2 formation by the patient's platelets are compatible with a platelet cyclo‐oxygenase deficiency. This study suggests that transmission is autosomal dominant. and confirms that cyclo‐oxygenase is not needed for aggregation and ATP release by high amounts of collagen.