Pluripotent Stem Cell Differentiation

Poster

F-2166 - THE REMOVAL OF FIBROBLAST GROWTH FACTORS PROMOTE HEPATOBLAST DIFFERENTIATION FROM HUMAN iPS CELL-DERIVED DEFINITIE ENDODERM CELLS

6/22/2018
19:00 - 20:00

Human induced pluripotent stem cell-derived hepatocyte-like cells are expected to be utilized in pharmaceutical research. In general, human induced pluripotent stem (iPS) cells are differentiated into hepatocyte-like cells through definitive endoderm cells and hepatoblast-like cells using various growth factors that are essential for liver development. Although recombinant bone morphogenetic proteins (BMPs) and fibroblast growth factors (FGFs) are widely used in the hepatoblast differentiation, hepatoblast differentiation process has not been fully modified. In this study, we examined the roles of BMPs and FGFs in the hepatoblast differentiation from human iPS cells. Surprisingly, the gene expression levels of hepatoblast markers (alpha-fetoprotein and cytokeratin 7) were upregulated by the removal of FGFs. In addition, the percentage of hepatoblast marker (cytokeratin 19)-positive cells was increased by the removal of FGFs (from 87% to 94%). On the other hand, the percentage of the definitive endoderm marker (Sry-related HMG-box gene 17)-positive cells was significantly decreased (from 21% to 10%), suggesting that residual definitive endoderm cells were decreased by the removal of FGFs. Furthermore, the hepatocyte differentiation potency was also significantly increased by the removal of FGFs. To examine whether FGF signals are completely unnecessary for the hepatoblast differentiation, the expression levels of endogenous FGF ligands and receptors were examined. The definitive endoderm cells highly expressed the FGF ligand, FGF2, and the FGF receptor, FGFR1. To examine the role of endogenous FGF signals, an FGFR inhibitor was treated during the hepatoblast differentiation. The hepatoblast differentiation was promoted by using FGFR inhibitor, suggesting that endogenous FGF signals are also unnecessary for the hepatoblast differentiation. In conclusion, we found that FGF signals are not essential for hepatoblast differentiation. We believe that our finding will be useful for generating functional hepatocyte-like cells for pharmaceutical applications.


 

Yukiko Toba

Osaka university, Osaka, Japan

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    F-2166 - THE REMOVAL OF FIBROBLAST GROWTH FACTORS PROMOTE HEPATOBLAST DIFFERENTIATION FROM HUMAN iPS CELL-DERIVED DEFINITIE ENDODERM CELLS



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