Abstract:
BACKGROUND:Solid organ xenograft rejection is associated with vascular injury resulting at least in part in platelet activation, and rejected xenografts invariably demonstrate intravascular thrombosis and interstitial hemorrhage. Complement activation plays a prominent role in platelet-endothelial interaction. We tested the effects of platelet GPIIb/IIIa inhibitor tirofiban during perfusion of hDAF pig hearts. METHODS:Using a working-heart model, nontransgenic and hDAF pig hearts were perfused with tirofiban or human blood only. Myocardial damage was determined by hemodynamic parameters (cardiac output, stroke work index) and creatine phosphokinase. Further monitoring included the assessment of complement factors (C3, C4), platelets, fibrinogen, ATIII, and graft histology. RESULTS:Tirofiban increased cardiac output (CO) and stroke work index (SWI) of nontransgenic pig hearts and improved superior CO and SWI of hDAF pig hearts. Although perfusion time of nontransgenic pig hearts was prolonged by tirofiban (196+/-65 min vs. 162+/-122 min), a similar effect in hDAF pig hearts (218+/-116 min vs. 222+/-30 min) could not be demonstrated. Tirofiban reduced consumption of C3 and C4 independently from hDAF. Depletion of fibrinogen was equally diminished by tirofiban and hDAF; the combination of both agents obtained no further reduction. ATIII consumption was most effectively inhibited by this combination. Intravascular fibrin deposition was reduced by tirofiban and hDAF, but particularly by the combination of the two agents. CONCLUSIONS:Improvement of heart performance and reduction of myocardial damage and intravascular thrombosis confirm a role of the GPIIb/IIIa inhibitor tirofiban for the prevention of hDAF pig heart rejection and xenograft function.
journal_name
Transplantationjournal_title
Transplantationauthors
Brandl U,Jöckle H,Erhardt M,Michel S,Burdorf L,Brenner P,Bittmann I,Rössle M,Mordstein V,Hammer C,Thein E,Reichart B,Schmoeckel Mdoi
10.1097/01.tp.0000295742.45413.dcsubject
Has Abstractpub_date
2007-12-27 00:00:00pages
1667-76issue
12eissn
0041-1337issn
1534-6080pii
00007890-200712270-00021journal_volume
84pub_type
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