Journal
AMERICAN JOURNAL OF TRANSPLANTATION
Volume 8, Issue 12, Pages 2558-2568Publisher
ELSEVIER SCIENCE INC
DOI: 10.1111/j.1600-6143.2008.02420.x
Keywords
Gene expression profiling; live donor transplantation; liver transplantation; living donor transplantation; MAP kinase; signaling; signal transduction; whole liver transplantation
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Funding
- Fujisawa Inc
- Marie Curie International Reintegration
- Programme National de Recherche en Hepato-gastro-enterologie (INSERM)
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Orthotopic liver transplantation (OLT) continues to be the only remedy for end-stage liver disease. In an attempt to decrease the ever-widening gap between organ donor and recipient numbers, and ultimately make more livers amenable to transplantation, we characterized the healthy human liver's response to ischemia and reperfusion-induced injury during transplantation. This was carried out by transcriptional profiling using cDNA microarray to identify genes whose expression was modulated at the 1-h postreperfusion time point. We observed that the map kinase phosphatase-1/dual-specificity phosphatase-1 (MKP-1/DUSP1) mRNA was strongly and significantly upregulated. Validation of this observation was carried out using reverse transcriptase-polymerase chain reaction (RT-PCR), immunoblotting and immunohistochemistry. In addition, we characterized the signaling pathways regulating MKP-1 expression using the human hepatoma cell line HepG2. Finally, by combining MKP-1 silencing with reperfusion-associated stresses, we reveal the preferential role of this protein in attenuating the activity of the JNK and p38(MAPK) pathways, and the resulting apoptosis, making MKP-1 a potential target for therapeutic intervention.
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