title: Hepatocyte-like cells derived from human amniotic epithelial cells can be encapsulated without loss of viability or function in vitro.
abstract: Placenta derived human amniotic epithelial cells (hAEC) are an attractive source of stem cells for the generation of hepatocyte-like cells (HLC) for therapeutic applications to treat liver diseases. During hAEC differentiation into HLC, they become increasingly immunogenic, which may result in immune cell-mediated rejection upon transplantation into allogeneic recipients. Placing cells within devices such as alginate microcapsules can prevent immune cell-mediated rejection. The aim of this study was to investigate the characteristics of HLC generated from hAEC and to examine the effects of encapsulation on HLC viability, gene expression, and function. hAEC were differentiated for 4 weeks and evaluated for hepatocyte-specific gene expression and function. Differentiated cells were encapsulated in barium alginate microcapsules and cultured for 7 days and the effect of encapsulation on cell viability, function, and hepatocyte related gene expression was determined. Differentiated cells performed key functions of hepatocytes including urea synthesis, drug-metabolizing cytochrome P450 (CYP)3A4 activity, indocyanine green (ICG) uptake, low-density lipoprotein (LDL) uptake, and exhibited glutathione antioxidant capacity. A number of hepatocyte-related genes involved in fat, cholesterol, bile acid synthesis, and xenobiotic metabolism were also expressed showing that the hAEC had differentiated into HLC. Upon encapsulation, the HLC remained viable for at least 7 days in culture, continued to express genes involved in fat, cholesterol, bile acid, and xenobiotic metabolism and had glutathione antioxidant capacity. CYP3A4 activity and urea synthesis by the encapsulated HLC were higher than that of monolayer HLC cultures. Functional HLC can be derived from hAEC, and HLC can be encapsulated within alginate microcapsules without losing viability or function in vitro.
authors.affiliation: 1 Centre for Genetic Diseases, Monash Institute of Medical Research, Monash University , Clayton, Victoria, Australia .
authors.forename: Vijesh
authors.initials: V
authors.lastname: Vaghjiani
authors.forename: Vijayaganapathy
authors.initials: V
authors.lastname: Vaithilingam
authors.forename: Indah
authors.initials: I
authors.lastname: Saraswati
authors.forename: Adnan
authors.initials: A
authors.lastname: Sali
authors.forename: Padma
authors.initials: P
authors.lastname: Murthi
authors.forename: Bill
authors.initials: B
authors.lastname: Kalionis
authors.forename: Bernard E
authors.initials: BE
authors.lastname: Tuch
authors.forename: Ursula
authors.initials: U
authors.lastname: Manuelpillai
mesh_terms: D000464:Alginates / Q000737:chemistry; D000650:Amnion / Q000166:cytology*; D015415:Biomarkers / Q000378:metabolism; D002214:Capsules; D002454:Cell Differentiation; D002470:Cell Survival; D017077:Culture Media, Conditioned; D004847:Epithelial Cells / Q000502:physiology*; D005260:Female; D015870:Gene Expression; D020723:Glucuronic Acid / Q000737:chemistry; D056945:Hep G2 Cells; D022781:Hepatocytes / Q000378:metabolism*; D006603:Hexuronic Acids / Q000737:chemistry; D006801:Humans; D010920:Placenta / Q000166:cytology; D011247:Pregnancy
chemical_list: D000464:Alginates; D015415:Biomarkers; D002214:Capsules; D017077:Culture Media, Conditioned; D006603:Hexuronic Acids; D020723:Glucuronic Acid