Importantly, presence of PVT is a strong predictor for developing acute liver decompensation following radioembolization. Unlike previous studies, prior systemic chemotherapy did not predispose to the development of liver decompensation. Disclosures: Coleman Smith – Advisory Committees or Review Panels: Vertex, Gilead, Janssen; Grant/Research Support: Gilead, Abbvie, Janssen, Salix, BMS, Merck, Intercept Pharma, Lumena Pharma;

Speaking and Teaching: Merck, Vetex, Gilead, Bayer/ Onyx, BMS, Abbvie, Janssen The following people have nothing to disclose: Michael Min, Totianna Prudhomme, Eduardo Ehrenwald, Jill May, Kai Hanson, Andrew J. Henn, Joseph Leach Objectives: Human hepatocyte (HC) transplantation has promise as a bridge to organ transplantation or spontaneous recovery in acute liver failure (ALF).

The survival and function of transplanted hepatocytes is limited however. Mesenchymal stromal cells 3-MA solubility dmso (MSC) have been shown to enhance the survival and function of co-cultured HC in addition to having additional anti-inflammatory/anti-apoptotic properties. The mechanism of this is unknown. The aim of this study was to investigate this mechanism by examining cytokine and growth factor production in vitro using human cells and serum to mimic in vivo conditions. Methods: Human HCs were isolated from donor organs and MSC from umbilical cord. Cells were plated in monoculture U0126 ic50 or co-culture at a ratio of 6:1 (HC:MSC). After 24 hr, serum from patients with ALF, normal control or fetal calf serum (FCS) was added and then removed 24 hours later, cells were washed and standard culture medium added. Cytotoxicity (MTT/SRB), specific

hepatocyte death and albumin production were measured 24 and 48 hours following medium change. Thirteen cytokines/growth factors were measured in medium using a multiplex array (Biochip Array, Randox, UK). Results: At both time points, MSC monoculture had higher cytotoxicity following exposure click here to ALF serum versus control (>50% reduction in MTT activity/cell attachment, p<0.001). HC monoculture maintained MTT activity and cell survival and also increased albumin production in ALF serum versus FCS medium (482 v 54 ng/24hr/well). Co-cultured HC and MSC demonstrated improved MTT activity in ALF serum compared to HC or MSC monoculture (p<0.05). IL6, IL8 and Monocyte Chemoattractant Protein 1 (MCP1) were secreted by MSC but not HC monoculture and there was a significant increase in production in co-culture following culture in ALF serum (p<0.05): MCP1 production in co-culture was increased 8x (mean 234 v 25ng/l) and IL8 production 14x (219 v 14ng/l) following culture with ALF serum versus control. Hepatocyte Growth Factor (HGF) secretion was detected in MSC and HC monoculture in all 3 conditions but was highest following co-culture in ALF serum. IL1Receptor antagonist (IL1Ra) was also increased in all 3 co-culture conditions versus HC monoculture (p<0.05).