title: In vivo liver regeneration potential of human induced pluripotent stem cells from diverse origins.
abstract: Human induced pluripotent stem cells (iPSCs) are a potential source of hepatocytes for liver transplantation to treat end-stage liver disease. In vitro differentiation of human iPSCs into hepatic cells has been achieved using a multistage differentiation protocol, but whether these cells are functional and capable of engrafting and regenerating diseased liver tissue is not clear. We show that human iPSC-derived hepatic cells at various differentiation stages can engraft the liver in a mouse transplantation model. Using the same differentiation and transplantation protocols, we also assessed the ability of human iPSCs derived from each of the three developmental germ layer tissues (that is, ectoderm, mesoderm, and endoderm) to regenerate mouse liver. These iPSC lines, with similar but distinct global DNA methylation patterns, differentiated into multistage hepatic cells with an efficiency similar to that of human embryonic stem cells. Human hepatic cells at various differentiation stages derived from iPSC lines of different origins successfully repopulated the liver tissue of mice with liver cirrhosis. They also secreted human-specific liver proteins into mouse blood at concentrations comparable to that of proteins secreted by human primary hepatocytes. Our results demonstrate the engraftment and liver regenerative capabilities of human iPSC-derived multistage hepatic cells in vivo and suggest that human iPSCs of distinct origins and regardless of their parental epigenetic memory can efficiently differentiate along the hepatic lineage.
authors.affiliation: Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA.
authors.forename: Hua
authors.initials: H
authors.lastname: Liu
authors.forename: Yonghak
authors.initials: Y
authors.lastname: Kim
authors.forename: Saul
authors.initials: S
authors.lastname: Sharkis
authors.forename: Luigi
authors.initials: L
authors.lastname: Marchionni
authors.forename: Yoon-Young
authors.initials: YY
authors.lastname: Jang
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002460:Cell Line; D019175:DNA Methylation; D053595:Embryonic Stem Cells / Q000166:cytology / Q000378:metabolism; D044127:Epigenesis, Genetic; D006801:Humans; D057026:Induced Pluripotent Stem Cells / Q000166:cytology* / Q000378:metabolism; D008099:Liver / Q000166:cytology / Q000378:metabolism; D008115:Liver Regeneration / Q000502:physiology*; D051379:Mice; D033581:Stem Cell Transplantation