The Combination of Inhibitors of FGF/MEK/Erk and GSK3β Signaling Increases the Number of OCT3/4- and NANOG-positive Cells in the Human Inner Cell Mass, but Does Not Improve Stem Cell Derivation

Overview

Journal Stem Cells Dev

Date 2012 Jul 13

PMID 22784186

Citations 10

Authors

Margot van der Jeught

Thomas OLeary

Sabitri Ghimire

Sylvie Lierman

Galbha Duggal

Karen Versieren

Dieter Deforce

Susana Chuva de Sousa Lopes

Bjorn Heindryckx

Petra De Sutter

Affiliations

Soon will be listed here.

Abstract

In embryonic stem cell culture, small molecules can be used to alter key signaling pathways to promote self-renewal and inhibit differentiation. In mice, small-molecule inhibition of both the FGF/MEK/Erk and the GSK3β pathways during preimplantation development suppresses hypoblast formation, and this results in more pluripotent cells of the inner cell mass (ICM). In this study, we evaluated the effects of different small-molecule inhibitors of the FGF/MEK/Erk and GSK3β pathway on embryo preimplantation development, early lineage segregation, and subsequent embryonic stem cell derivation in the humans. We did not observe any effect on blastocyst formation, but small-molecule inhibition did affect the number of OCT3/4- and NANOG-positive cells in the human ICM. We found that combined inhibition of the FGF/MEK/Erk and GSK3β pathways by PD0325901 and CHIR99021, respectively, resulted in ICMs containing significantly more OCT3/4-positive cells. Inhibition of FGF/MEK/Erk alone as well as in combination with inhibition of GSK3β significantly increased the number of NANOG-positive cells in blastocysts possessing good-quality ICMs. Secondly, we verified the influence of this increased pluripotency after 2i culture on the efficiency of stem cell derivation. Similar human embryonic stem cell (hESC) derivation rates were observed after 2i compared to control conditions, resulting in 2 control hESC lines and 1 hESC line from an embryo cultured in 2i conditions. In conclusion, we demonstrated that FGF/MEK/Erk and GSK3β signaling increases the number of OCT3/4- and NANOG-positive cells in the human ICM, but does not improve stem cell derivation.

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