title: Persistent hematomas in Japanese black cattle with impaired platelet aggregation function and large granule eosinophils.
abstract: In Japanese black cattle with large and long-existing hematomas, platelets was impaired in collagen aggregation function in vitro. There was no statistically significant difference from control animals in the tests of PT (prothrombin time) and PTT (partial thromboplastin time) for extrinsic and intrinsic blood coagulation system. Aside from impaired collagen aggregation function, platelets in the hematoma cattle showed the similar aggregation patterns as the normal cattle, when ADP, serotonin (5-HT), thrombin, arachidonic acid, epinephrine and ristocetin were used as agents for inducing aggregation. Decreased aggregation function as well as impaired collagen-induced release response in platelets suggested the hematoma cattle to be of storage pool disease (SPD). The impaired platelet was postulated to be a main cause of the large and long-existing hematomas. All of the hematoma cattle with impaired platelet functions had the eosinophils in peripheral blood of which granules were fewer and larger than normal ones. These large eosinophil granules were peroxidase positive and periodic acid Schiff (PAS) staining negative as typical eosinophil granules.
authors.affiliation: Department of Veterinary Medicine, Kagoshima University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Akuzawa
authors.forename: M
authors.initials: M
authors.lastname: Morizono
authors.forename: N
authors.initials: N
authors.lastname: Yasuda
authors.forename: K
authors.initials: K
authors.lastname: Okamoto
authors.forename: M
authors.initials: M
authors.lastname: Matumoto
authors.forename: K
authors.initials: K
authors.lastname: Okamoto
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000494:pharmacology; D002417:Cattle; D002418:Cattle Diseases / Q000097:blood*; D003094:Collagen / Q000494:pharmacology; D003594:Cytoplasmic Granules / Q000473:pathology*; D004804:Eosinophils / Q000473:pathology*; D004837:Epinephrine / Q000494:pharmacology; D005260:Female; D006406:Hematoma / Q000097:blood / Q000662:veterinary*; D007124:Immunoenzyme Techniques; D009135:Muscular Diseases / Q000097:blood / Q000662:veterinary; D010314:Partial Thromboplastin Time / Q000662:veterinary; D010375:Pedigree; D010974:Platelet Aggregation; D010976:Platelet Count / Q000662:veterinary; D011517:Prothrombin Time / Q000662:veterinary; D012310:Ristocetin / Q000494:pharmacology; D012701:Serotonin / Q000494:pharmacology; D012871:Skin Diseases / Q000097:blood / Q000662:veterinary; D013917:Thrombin / Q000494:pharmacology
chemical_list: D001095:Arachidonic Acids; D012310:Ristocetin; D016718:Arachidonic Acid; D012701:Serotonin; D000244:Adenosine Diphosphate; D003094:Collagen; D013917:Thrombin; D004837:Epinephrine