OBJECTIVES: As activin/nodal signaling plays a key role in definitive endoderm (DE) differentiation, we have explored activin A-induced differentiation of DE from human parthenogenetic embryonic stem cells (hPESCs). RESULTS: Administration of 5 ng activin A/ml had no effect on the expression of markers of DE differentiation. However, higher concentrations of activin A (50 and 100 ng/ml) upregulated Sox17 and Cxcr4, as well upregulating the mesendodermal precursor marker, Brachyury. CONCLUSIONS: These findings demonstrate that low dose activin A can maintain the undifferentiated potency of hPESCs, whereas higher doses induce DE differentiation; 50 ng/ml is the optimal concentration for inducing DE from hPESCs.
OBJECTIVES: As activin/nodal signaling plays a key role in definitive endoderm (DE) differentiation, we have explored activin A-induced differentiation of DE from human parthenogenetic embryonic stem cells (hPESCs). RESULTS: Administration of 5 ng activin A/ml had no effect on the expression of markers of DE differentiation. However, higher concentrations of activin A (50 and 100 ng/ml) upregulated Sox17 and Cxcr4, as well upregulating the mesendodermal precursor marker, Brachyury. CONCLUSIONS: These findings demonstrate that low dose activin A can maintain the undifferentiated potency of hPESCs, whereas higher doses induce DE differentiation; 50 ng/ml is the optimal concentration for inducing DE from hPESCs.