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• W157435394 abstract "Orthotopic liver transplantation (OLT) is the only curative therapy for end-stage liver diseases. To overcome organ shortage, organs from extended criteria donors, which would ordinarily be discarded, are used sometimes. These organs provide additional grafts; however, they are more susceptible to ischemia-reperfusion (I/R) injury. I/R injury, an unavoidable process during OLT, is a major cause of liver graft non-function and failure, requiring urgent re-transplantation, which further depletes the scare organ pool. To date, no therapy is available to reduce or prevent I/R injury. Prostaglandins (PG) have well characterized vasodilatory and anti-platelet aggregatory actions. Many PG analogues, including prostacyclin (PGI2), have been evaluated for their ability to reduce hepatic I/R injury after OLT. Poor stability, intolerable side effects, and the inability to show a significant difference in primary endpoint have limited their clinical application so far. Treprostinil, a relatively new FDA-approved PGI2 analogue, has a higher stability, potency, and longer elimination half-life than other PGI2 analogues available. The objectives of this dissertation were to examine the efficacy of treprostinil in protecting the liver graft against I/R injury during OLT. Proof of concept of treprostinil minimizing hepatic I/R injury was demonstrated in a rat OLT model. Further analysis showed that I/R injury significantly down-regulated CYP2E1, CYP2C11, and CYP3A mRNA, protein expression, and activity, as well as the expression of several hepatic transporters in liver graft post-OLT. Treprostinil improved hepatic expression and activity of CYP450 enzymes and transporters. In particular, Bsep mRNA expression was restored to normal and Mrp2 and P-gp protein expression were up-regulated. In vitro studies confirmed that treprostinil does not inhibit or induce the metabolism of immunosuppressive medications. These findings support co-administration of treprostinil with cyclosporine A, tacrolimus, sirolimus, or mycophenolic acid to adult OLT patients without concern for any drug-drug interaction. This is the first study to examine the efficacy of treprostinil for protection of liver grafts against I/R injury during OLT. A clinical study has been initiated to examine the safety and efficacy of perioperative treprostinil administration to adult OLT patients. Collectively, this work makes significant contributions to the field of liver transplantation and, potentially, solid organ transplantation." @default.
• W157435394 created "2016-06-24" @default.
• W157435394 creator A5081847615 @default.
• W157435394 date "2011-01-11" @default.
• W157435394 modified "2023-09-23" @default.
• W157435394 title "TREPROSTINIL FOR PROTECTION OF LIVER GRAFTS AGAINST ISCHEMIA AND REPERFUSION INJURY DURING ORTHOTOPIC LIVER TRANSPLANTATION - A TRANSLATIONAL STUDY" @default.
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