title: Behavior of platelets and leukocytes on the luminal surface of small caliber polyurethane grafts.
abstract: With scanning electron microscopy, we examined the behavior of platelets and leukocytes on the luminal surface of small caliber polyurethane grafts implanted into small arteries of dogs. Thirty-five grafts were implanted to the carotid and/or femoral arteries. The animals were treated with aspirin and/or DN9693, an inhibitor of phosphodiesterase. In the group treated with aspirin (40 mg/kg i.v.), the deposition of platelets on the luminal surface of the implanted polyurethane grafts was suppressed and the luminal surface was covered with adherent leukocytes. Fibrin nets were formed on the adherent leukocytes. In addition, the adhesion of leukocytes on the grafts was considerably suppressed in the group treated with DN9693 (50 micrograms/kg/min i.v.), and the formation of fibrin nets was markedly reduced. In contrast, in the control group the luminal surface was covered with numerous platelets and some leukocytes, which formed thrombi. These findings suggest that leukocytes adhere primarily to the prosthetic graft and play an important role in the initiation of fibrin formation.
authors.affiliation: Department of Cardiovascular Surgery, Faculty of Medicine, Kyoto University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Matsumoto
authors.forename: T
authors.initials: T
authors.lastname: Ban
authors.forename: Y
authors.initials: Y
authors.lastname: Okamoto
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000037:antagonists & inhibitors / Q000627:therapeutic use; D000818:Animals; D001241:Aspirin / Q000627:therapeutic use; D001792:Blood Platelets / Q000502:physiology*; D001807:Blood Vessel Prosthesis; D002339:Carotid Arteries / Q000601:surgery; D002448:Cell Adhesion; D004285:Dogs; D005263:Femoral Artery / Q000601:surgery; D005337:Fibrin / Q000096:biosynthesis; D006083:Graft Occlusion, Vascular / Q000209:etiology* / Q000517:prevention & control; D007962:Leukocytes / Q000502:physiology*; D008855:Microscopy, Electron, Scanning; D010975:Platelet Aggregation Inhibitors / Q000627:therapeutic use; D011140:Polyurethanes; D011799:Quinazolines / Q000627:therapeutic use
chemical_list: D010975:Platelet Aggregation Inhibitors; D011140:Polyurethanes; D011799:Quinazolines; D005337:Fibrin; C049662:1,5-dihydro-7-(1-piperidinyl)-imidazo(2,1-b)quinazolin-2(3H)-one; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D001241:Aspirin